TECHNICAL MANUAL 888-2500-001 DAX-1/DAX-3 AM Transmitter DAX-1/DAX-3 AM Transmitter Harris Broadcast T.M. No. 888-2500-001 © Copyright Harris Broadcast 2003, 2004, 2005, 2007, 2012, 2013 All rights reserved 02May2013 Rev.
Manual Revision History DAX-1/DAX-3 AM Transmitter Technical Manual REV. DATE Preliminary 18dec2003 Created 0 31mar2004 Review Copy to Service, Engineering, & Safety A 12apr2004 Release Rev. A B 03jan2005 Update all chapters B1 26apr2007 Updated Parts List C 15nov2012 62247 Updated Title Page, MRH-1 and Parts List D 24apr2013 62703 Updated Title Page, MRH-1 and Table 6-1 5/2/2013 ECN Pages Affected 888-2500-001 MRH-1 WARNING: Disconnect primary power prior to servicing.
Returns And Exchanges Damaged or undamaged equipment should not be returned unless written approval and a return authorization is received from Harris Broadcast. Special shipping instructions and coding will be provided to assure proper handling. Complete details regarding circumstances and reasons for return are to be included in the request for return. Custom equipment or special order equipment is not returnable.
/2/2013 888-2500-001 WARNING: Disconnect primary power prior to servicing. v Item ______________________________ Quantity Part Number ________________________________ ______________________________ Ref Des e.g. C21, R100, etc. Item Used On Assembly if Known e.g. C21 used on 992-8025-001 & Schematic 839-8038-991 Comments Guide for Ordering Parts: Please provide as much information as possible to facilitate part substitution as required.
vi 888-2500-001 5/2/2013 WARNING: Disconnect primary power prior to servicing.
Guide to Using Parts List Information The Replaceable Parts List Index portrays a tree structure with the major items being leftmost in the index. The example below shows the Transmitter as the highest item in the tree structure. If you were to look at the bill of materials table for the Transmitter you would find the Control Cabinet, the PA Cabinet, and the Output Cabinet.
! WARNING: THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS. PERSONNEL MUST AT ALL TIMES OBSERVE SAFETY WARNINGS, INSTRUCTIONS AND REGULATIONS. This manual is intended as a general guide for trained and qualified personnel who are aware of the dangers inherent in handling potentially hazardous electrical/electronic circuits. It is not intended to contain a complete statement of all safety precautions which should be observed by personnel in using this or other electronic equipment.
5/2/2013 888-2500-001 WARNING: Disconnect primary power prior to servicing.
FIRST-AID Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it is a brief and is only to be used as a reference. It is the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid and there by prevent avoidable loss of life. Treatment of Electrical Burns 1.
Table of Contents Section 1 Introduction Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . 1-1 Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Section 2 Installation Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Unpacking & Returns and Exchanges . . . . . . . . . . . . 2-1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents (continued) External I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Audio Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Modulation Monitor . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 RS232 Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Low Voltage Power Supplies . . . . . . . . . . . . . . . . . . 4-3 RF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 PA Module . . . .
DAX-1/DAX-3 Section 1 Introduction 1.1 1 Purpose of This Manual This technical manual contains the information pertaining to the DAX-1/DAX-3 Enhanced AM transmitters. The various sections of this technical manual provide the following types of information. 5/2/2013 • Section 1, Introduction/Specifications, provides general manual layout, frontispiece, equipment description, block diagram.
Section 1 Introduction DAX-1/DAX-3 Figure 1-1 DAX-1 Transmitter & Transformer Cabinet 1.
Section 1 Introduction DAX-1/DAX-3 • • • • • Enhanced audio performance — even at low-power PSSA power levels Loud-yet clean! With peak modulation to +145% Linear high voltage power supply for simplicity and easy maintenance Quiet DC-controlled cooling Designed as a digital transmitter from the start, simply add a Harris Broadcast DEXSTAR IBOC exciter for a seamless IBOC transition Intelligent User Interface • • Extensive diagnostics and lower-stage metering • • • Extensive parallel user interface f
Section 1 Introduction 1.3 DAX-1/DAX-3 General Description The DAX-1/DAX-3 is a state of the art solid state medium wave transmitter with a rated output power of 1/3kW combining improved digital amplitude modulation technology with APDM (Advanced PDM). The Direct Digital Drive (3D) system supplies the RF amplifier with TTL level signals eliminating the need for a high-level drive chain, splitters, cables and tuned circuits.
DAX-1/DAX-3 Section 2 Installation 2.1 2 Introduction This section details the procedures to receive, install, and prepare the transmitter for use, as well as initial turn-on steps. 2.2 Unpacking & Returns and Exchanges Refer to the second page of this manual for instructions on unpacking, inspecting, and procedures in the event of any damages from shipment or omissions. NOTE: Retain all packaging materials in the event the transmitter would require factory servicing. 2.2.
Section 2 Installation DAX-1/DAX-3 The size of the basic cabinet is 19" wide by 27.94" high by 22.88" deep. Keep in mind that a minimum of 24 inches should be allowed for maintenance access from both the front and rear of the cabinet. The included NEMA enclosed transformer weighs approximately 97 pounds (43 kg) for the DAX-1, and 162 pounds (73 kg) for the DAX-3 unit. 2.2.3 Factory Test Data Locate and retain the FACTORY TEST DATA.
User Interface 5/2/13 Power Amplifier Modules (DAX-3 Shown) PA1 PA2 Relay Module * Exciter Access Panel RF Output * - Relay Module used only for DAX-1R (Redundant Module Option – shown) External I/O Board AC Entry (rear) DAX-1/DAX-3 Section 2 Installation Figure 2-1 Front Views of DAX-1 Transmitter 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 2 Installation Removable Panel Circuit Breaker Fans & Air Filters Removable Panel I/O Entry (front) Removable Power Supply Output Monitor DAX-1/DAX-3 Figure 2-2 Rear Views of DAX-1 Transmitter 2-4 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 2 Installation DAX-1/DAX-3 To facilitate proper installation and initial checkout, this data and the technical manual should be carefully studied to obtain a thorough understanding of the principles of operation, circuitry, nomenclature, and performance characteristics. The transmitter installation is accomplished in the following order: 1. Transmitter/transformer placement 2. Air System and Cooling 3. Grounding 4. Power Supply connections 5. RF Connections 6. Transmitter Wiring 7.
Section 2 Installation 2.3.1.1 DAX-1/DAX-3 Transmitter/Transformer Cabinet Positioning Review the Outline Drawing to determine the size and placement of the transmitter at your location. The transmitter and transformer should be located to permit adequate maintenance access and sufficient ventilation. ! CAUTION: UNIT MUST NOT BE DROPPED. TWO PEOPLE ARE NEEDED TO REMOVE THE CABINET FROM THE PALLETS, AND TO PLACE THE UNIT INTO A CABINET OR WALL OPENING.
Section 2 Installation DAX-1/DAX-3 2.3.3 Grounding A grounding strap between the transmitter and the station earth ground must be properly connected before AC power wiring is attached to transmitter (see "2.3.3.1 Grounding Connections" on page 2-8 for complete procedure). Grounding Basics The importance of a good grounding system and lightning protection can hardly be overemphasized for reasons of personnel safety, protection of the equipment, and equipment performance.
Section 2 Installation DAX-1/DAX-3 feedback. Wire and cable shields should normally be connected at both ends to the equipment chassis, audio cables should have the shield connected to ground on one side only. 2.3.3.1 Grounding Connections NOTE: Once the transmitter has been correctly positioned it will be necessary to remove the Front panel, Rear panel, and Fan panel for access to the transmitter connections.
Section 2 Installation DAX-1/DAX-3 Power Supply Chassis Opening ("square slot") B+ Supply Connector J1/P1 PS Ground Wire #98 Bottom AC Entry E10 Safety Ground Block Figure 2-3 E10 Safety Ground Block (Shown with Fan Panel) 2.3.4 Power Supply Connections Power supply connections are performed in two steps: Main Transformer connections, followed by Transmitter AC Connections. These procedures follow below.
Section 2 Installation DAX-1/DAX-3 Use the following table to the determine correct fuse and wire gauge STEP 1 Table 2-1 AC Mains Supply Wire Gauge and Fuse Size DAX-1 DAX-3 Fuse Size 20 40 Wire Gauge 12 AWG 10 AWG STEP 2 Connect the single-phase AC mains to the primary side of the Main Transformer according to the following table to attain the desired match to line conditions Table 2-2 AC Line Connections: Line Condition Transformer Primary Connections Neutral Line 220 230 240 0 0 0 220
Section 2 Installation DAX-1/DAX-3 +5% Common 0 -5% LV 220 230 240 HV Figure 2-4 Main Transformer Schematic STEP 3 Connect the AC mains input safety ground wire to the E5 safety ground stud within the transformer enclosure (see Figure 2-5 below), labeled "Earth Ground" Once the primary side of the Main Transformer has been connected, the secondary output can be connected to the DAX transmitter via the included 15’ 4-conductor Power Cable.
Section 2 Installation DAX-1/DAX-3 E5 Safety Ground Power Factor Correction Capacitor Leads Primary Side Secondary Side Figure 2-5 Main Transformer Wiring View - DAX-1/DAX-1R 2.3.4.2 Transmitter AC Connection NOTE: To improve access to CB1, it will be helpful to slide the power supply chassis partially out the rear of the transmitter cabinet. Use the following steps to gain the necessary access to CB1. 2.3.4.2.
Section 2 Installation DAX-1/DAX-3 NOTE: For the next 2 steps see Figure 2-3, above, for reference.
Section 2 Installation DAX-1/DAX-3 2.3.4.2.2 Top Entry The top entrance for the AC power cable is a circular opening, located on the rear-right top (as viewed from the front of DAX) of the cabinet. This entry provides a channel, routing the cable directly to a sidewall exit just above the circuit breaker CB1 terminals in the power supply section of the DAX transmitter. STEP 1 To improve access to CB1, perform steps in section "2.3.4.2.
Section 2 Installation DAX-1/DAX-3 • HV (black) to terminal closest to sidewall • LV (red) to middle terminal • Common (white) to terminal farthest from sidewall • Ground (green) to E1 stud (on sidewall just below CB1) for safety ground STEP 6 Replace CB1 cover HV Terminal (Black) LV Terminal (Red) Common Terminal (White) E1 Safety Ground Stud (Green) Figure 2-6 Transformer Power Cable Connections to CB1 & E1 (As viewed from the rear) At this point the AC wiring is complete, however, it is not recomm
Section 2 Installation 2.3.5 DAX-1/DAX-3 RF Connections NOTE: Place a piece of cardboard over exhaust holes in top of cabinet when working with small hardware that could fall through during installation. Carefully connect the output transmission line from the antenna to the 7/8 EIA flange connector for the DAX-3, or N-connector for the DAX-1 located on the top rear of the cabinet. 2.3.
Section 2 Installation DAX-1/DAX-3 5/2/13 STEP 4 Press the tool tip completely into the hole associated with the pin # to be connected (NOTE: There is also corresponding slots on the side of connector block where a small screwdriver may be used to momentarily press in while inserting the wire) STEP 5 Carefully press the wire into the corresponding receptacle STEP 6 Remove tool STEP 7 Examine connection for security 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 2 Installation STEP 8 2-18 DAX-1/DAX-3 Repeat for all WAGO 733-series connections 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 2 Installation DAX-1/DAX-3 Figure 2-7 External I/O Board Remote Connections 5/2/13 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 2 Installation 2.3.6.2 DAX-1/DAX-3 Basic Connections The following procedures refer to the External I/O board which is located behind the Controller/External I/O panel on the front of the DAX. To perform these connections this panel will need to be removed. NOTE: It is recommended that any remote control or status connections be made only after the transmitter has been initially turned on and operation verified.
Section 2 Installation DAX-1/DAX-3 2.3.6.3.3 Bessel Filter Input Bandwidth Select For digital operation be sure S2, S3, and S4 switches, located on the Exciter/Controller board, all have the #1 switch in the up position, and the rest down. This is for full 50 kHz bandwidth operation required for domestic IBOC broadcast. Narrow-mode AM utilized in countries other than the USA will find the other filter settings useful to match their system.
Section 2 Installation 2.3.6.4 DAX-1/DAX-3 External Carrier or 10 MHz Reference Use To use an externally generated carrier signal or 10 MHz reference signal, route the cable to BNC connectors J11 for the external carrier or J10 for the 10 MHz reference on the External I/O board. External carrier or 10 MHz reference must then be enabled via the VT100 screen per the procedure below (See "6.2.
Section 2 Installation DAX-1/DAX-3 2.4 Initial Turn On Each transmitter is thoroughly checked out during factory final test but some adjustments may be required during installation due to shipping, variations in primary power, antenna systems, or transmission line differences. ! CAUTION: ANY REMOTE OR EXTENDED CONTROL CONNECTIONS SHOULD BE CONNECTED ONLY AFTER THE TRANSMITTER IS CHECKED OUT AND FULLY OPERATIONAL.
Section 2 Installation 2.5 DAX-1/DAX-3 Remote I/O Connections Once the DAX transmitter has been turned on for the first time and correct operation has been verified, remote connections may be made. Using the following tables, Figure 2-7 on page 2-19, and the supplied schematic package, configure the DAX remote I/O to match the requirements of your interface equipment. NOTE: Torroid cores are provided for I/O cabling coming in to the DAX to for RFI rejection.
Section 2 Installation DAX-1/DAX-3 Table 2-4 Remote Command Inputs and Functions J(n) COMMAND NAME ACTIVE FUNCTION J5-1 GNDC - Command return J7-12 GNDC - Command return J7-6 DIGITAL PRESent RETURN - RMT Digital Present command return See 2nd Note below NOTE: The Remote Commands are referenced to the customer ground, which is allowed to float 30V above or below the system ground. It is recommended to connect all Command signal returns to a GNDC connection.
Section 2 Installation Table 2-5 DAX-1/DAX-3 Remote Status Outputs and Functions J(n) STATUS NAME ACTIVE FUNCTION J9-3 Remote Disable STAT Low State Remote Control disabled when active J9-2 Digital Mode STAT Low State Digital Mode enabled when active J7-5 GND - Status return J7-1 GND - Status return J9-12 GND - Status return J9-7 GND - Status return J9-1 GND - Status return NOTE: The Remote Statuses are referenced to the transmitter ground.
Section 2 Installation DAX-1/DAX-3 2.6 Mod Monitor Setup To properly interface the DAX transmitter with a modulation monitor across the 5 power levels, each power level must have a corresponding Mod Monitor Level setting. These settings will need to be adjusted, after the power levels have been set (see "3.3.3.3 To Set Desired RF Power Output Level" on page 3-5), to correctly drive the mod monitor input. This is done via the GUI or by using the VT100 serial programming capability.
Section 2 Installation DAX-1/DAX-3 NOTE: If power levels are re-programmed, the Mod Monitor Levels will also need to be re-programmed for accurate modulation monitoring using the correct input drive. 2.6.2 Via VT100 See "6.2.2 Using VT100 for Metering, Status & Configuration" on page 6-3, particularly the note and following screen on page 6-12 for accessing the page 4 VT100 configuration screen for the following procedure.
Section 2 Installation DAX-1/DAX-3 The following table lists pertinent jumpers and potentiometers, and provides their corresponding designator value and function within each board in the DAXtransmitter. Table 2-7 DAX Jumpers and Potentiometers Listing JP/R (n) NAME Location FUNCTION JP1 Select either green or red Front Panel LED during remote disable External I/O 1-2 = Green @ remote disable 2-3 = Red @ remote disable JP2 Ref.
Section 2 Installation Table 2-7 DAX-1/DAX-3 DAX Jumpers and Potentiometers Listing JP/R (n) NAME Location FUNCTION R44 2nd HARMONIC Exciter Controller Nulls 2nd harmonic and balances Bridge A/B (TP27/ TP28) - Factory use only R45 BRIDGE A/B Exciter Controller Sets dead time on Bridge A/B for 65nS ±3nS (TP27/TP28) R56 RFL POWER Exciter Controller Sets reflected power trip point (TP30) - Factory use only JP1 PA2_TO_PA1_INTLK Motherboard Set 1-2 to continue interlock onto next PA JP2 PA
DAX-1/DAX-3 3 Section 3 Operation 3.1 Introduction This section contains normal day-to-day operational procedures and information pertaining to the function of the DAX-1/DAX-3 Digital AM Transmitter. All of the information in this section assumes the transmitter is in proper working order. 3.2 Front Panel Functions and Displays The Front Panel of the DAX transmitter is the control center for normal operational commands.
Section 3 Operation 3.2.1 DAX-1/DAX-3 GUI Screen Software-driven, 4-line LCD for metering and diagnostics textual display. 3.2.2 METER, POWER, INFO Menu Switches Pressing one of these three buttons will take you to the next layer of menus for extensive metering, status information, and configurable parameters. Once within one of these menus, the UP, ENTER, and DOWN controls are used to maneuver through them. NOTE: It is normal operation for the Power Meter display to vary ±1%. 3.2.
Section 3 Operation DAX-1/DAX-3 3.3 Normal Operation NOTE: It is important that the operator be aware of normal transmitter operation and performance, and note any changes or fault indications. Changes in operation may indicate a need for maintenance or corrective action before more serious problems develop. 3.3.1 Daily Pre-Operational Checkout Before normal daily turn-on, review the following areas of the transmitter; a.
Section 3 Operation DAX-1/DAX-3 Figure 3-2 Main (default) Screen 3.3.3 Common Control Selections & Routine Metering This section covers the most common uses of the GUI. The following symbols for the DAX transmitter GUI screen apply throughout all levels of menus.
Section 3 Operation DAX-1/DAX-3 3.3.3.2 Selecting Power Levels 1 - 5 DAX transmitters will be preset at the factory to the customer specified Power Levels 1 - 5.
Section 3 Operation DAX-1/DAX-3 NOTE: This procedure requires 2 separate sets of steps (Power Level Range: Steps 1 - 8, and Actual RF Power Output: Steps 9 - 13) for each power level desired.
Section 3 Operation DAX-1/DAX-3 STEP 12 After the desired power value has been attained using one of these buttons, press and hold ENTER for >3 seconds (wait for reverse video to flash, indicating value is saved) to store the setting for that Power Level STEP 13 Repeat steps 10 - 12 for the remaining desired power levels NOTE: For optimum performance it is best to program the desired power level range, as shown above.
Section 3 Operation • • • • DAX-1/DAX-3 Frequency: RF Carrier frequency EXC HW: Exciter/Controller board hardware version EXTIO HW: External I/O board hardware version SW REV: Control software version The following steps will take you to the above listed statuses: STEP 1 Pressing the INFO button takes you to submenu screen STEP 2 Select STATUS SUBMENU using the UP or DOWN buttons STEP 3 Press ENTER to bring up below screen Figure 3-8 Status Screen 3.3.
Section 3 Operation DAX-1/DAX-3 3.4 Emergency Operation In the unlikely event of a DAX transmitter malfunction, the Front Panel indications, GUI screen, individual board indications, and VT100 protocol should quickly assist the technician in determining a probable cause. Depending on the Front Panel indications, early steps in troubleshooting a DAX transmitter failure can be based on one or more of the following: 3.4.1 No Front Panel LEDs or GUI 1. Reset CB1 2. Check AC Mains 3.4.
Section 3 Operation DAX-1/DAX-3 Figure 3-10 Fault Log Screen STEP 4 If more than three faults are present (" more" or "more " will be seen on bottom line of GUI), they can be viewed by scrolling using the UP or DOWN buttons STEP 5 To clear the Fault Log, from this screen, press and hold the ENTER button for >2 seconds 3.4.
Section 3 Operation DAX-1/DAX-3 NOTE: During this active foldback state any ON or RAISE/LOWER command, or a fault reset will clear any foldback condition and the previous power output level will be restored. However, if high a VSWR situation continues, the foldback routine will repeat. If this is the case, the cause of the VSWR should be corrected before continuing normal DAX operation. 3.4.
Section 3 Operation 3.5 DAX-1/DAX-3 Common Settings Via VT100 The following screens describe the Operator-specific pages of the VT100 interface. 3.5.1 VT100 Setup For all meter readings and programming including and beyond the front panel abilities, the VT100 is the emulation method used to interface a computer with the DAX transmitter. Any parameter accessible on the front panel GUI can also be viewed and modified via VT100.
Section 3 Operation DAX-1/DAX-3 STEP 3 Press the "Enter" key to store that entry • EXAMPLE: To change the Forward Power Range of Power Level 4 to 2800W; on page 2 of the VT100 screens, type "4", then use your keyboard’s up or down arrow keys to reach 2800. Then hit "Enter" on your keyboard to store. To toggle (turn on/off) a command: STEP 1 Type the corresponding number or letter in parenthesis - do NOT hit "Enter" • EXAMPLE: To mute the DAX; on page 2 of the VT100 screens, type the letter "e".
Section 3 Operation DAX-1/DAX-3 Reflected Pwr: Reflected power to the transmitter measured using a detector on the Output Monitor board. Instantaneous reflected trip point is factory set to 100W per PA module. VSWR: Voltage standing wave ratio. Example: 1.009 reading indicates 1.009:1 ratio. DC Voltage: High voltage power supply (B+) voltage measured via B+ Sample board. Voltage range is 100V – 300V and varies with power level setting.
Section 3 Operation DAX-1/DAX-3 SW Rev: Indicates the present software revision installed in the transmitter Exciter/ Controller board. Fan 1, 2, 3, 4: Indicates the actual fan speed of the transmitter cooling fans. Normal operation is approximately 100Hz. Fault occurs below 80 Hz. 3.5.2.2 CURRENT STATUS PA 1 - 6: Indication of PA module status. Possible indications are: NA (Not Available) indicating PA module not installed, OK indicating no faults present on PA module, or FAULT.
Section 3 Operation 3.5.2.3 DAX-1/DAX-3 METERS Exhaust Temp: Temperature measured on the Output Monitor board. Temperature Fault (OM TEMP) occurs at 62º C. V+ DTG: Dead Time Generator adjustment voltage measured on the Exciter/ Controller. This voltage directly corresponds to the transmitter carrier frequency setting. Scaling is 1V per 100kHz. V+ ePDM: Enhanced PDM adjustment voltage measured on the Exciter/Controller. This voltage directly corresponds to the ePDM frequency.
Section 3 Operation DAX-1/DAX-3 3.5.3 VT100 - Page 2 Figure 3-13 VT100 Page 2 View 3.5.3.1 Remote Control NOTE: All remote functions with the exception of (B) Off and (E) Mute are ignored when the transmitter user interface Remote Enable is OFF. (A) On: Pressing ‘A’ will turn the transmitter ON. (B) Off: Pressing ‘B’ will turn the transmitter OFF. (C) Raise: Pressing ‘C’ will raise the output power of the transmitter. (D) Lower: Pressing ‘D’ will lower the output power of the transmitter.
Section 3 Operation DAX-1/DAX-3 (H) Primary PA (DAX-1R only): Allows switching of on-air PA module. ‘A’ selects bottom PA as primary, ‘B’ selects top PA as primary. NOTE: The actual switching of PAs does not take place until the DAX transmitter is restarted, which can simply be pushing the ON button while the transmitter is running. 3.5.3.2 Power Settings (1) Level 1: Pressing ‘1’ changes the transmitter power setting to Level 1.
Section 3 Operation DAX-1/DAX-3 3.5.4 VT100 - Page 3 Figure 3-14 VT100 Page 3 View - Fault Log NOTE: See "6.4 Fault Log Listing" on page 6-27 to view the complete listing of possible DAX transmitter faults. This table also includes a description of each fault and an explanation of the transmitter’s response to the fault. INDEX – Up to 75 faults can be logged into the circular fault log. When 75 has been reached the oldest fault will be discarded when a new fault occurs.
Section 3 Operation 3-20 888-2500-001 WARNING: Disconnect primary power prior to servicing.
DAX-1/DAX-3 Section 4 Theory of Operation 4.1 4 Introduction This section provides block diagram level theory to assist the technician in understanding and troubleshooting the transmitter. System level, subsystems, and assemblies all fall under the following headings: • • • 4.2 Control RF Power Supply Control 4.2.1 Exciter/Controller The Exciter/Controller board performs the following functions: 4.2.1.1 DSP The DSP for the Exciter performs the supervisory, and adaptive correction algorithms.
Section 4 Theory of Operation 4.2.1.3 DAX-1/DAX-3 Field Programmable Gate Array (FPGA) The Field Programmable Gate Array FPGA on the Exciter will perform all the real time processing of the input serial data, all correction functions, control the turn on/off of the PA modules, provide status information to the DSP, and distribute the Audio and PDM clock to the PDM drive circuitry. 4.2.1.
Section 4 Theory of Operation DAX-1/DAX-3 4.2.1.6 Frequency Dependent Filter Board A single printed circuit board is comprised of 3 separate filters of the same frequency band. The NCO output filter, RF carrier input filter, and RF sample input filter will provide the necessary frequency dependent protection. 4.2.
Section 4 Theory of Operation 4.3 DAX-1/DAX-3 RF The DAX is an advanced PDM (APDM) transmitter, utilizing enhancements of technology to minimize legacy PDM limitations while maximizing its strengths. The following drawing shows the RF flow for the DAX transmitter: Figure 4-2 DAX RF Flow Block Diagram 4-4 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation DAX-1/DAX-3 4.3.1 PA Module 4.3.1.1 General Information Carrier frequency : 529kHz to 1705kHz PA output carrier power : 1000W + 15% max. Maximum output power : 1150W peak DAX-1/DAX-1R 3450W peak DAX-3 Modulator switching frequency is 150kHz to 200kHz (synchronous with the carrier frequency). Figure 4-3 PA Module Block Diagram 4.3.
Section 4 Theory of Operation 4.4 DAX-1/DAX-3 Power Supply System The power supply system provides all DC power for the transmitter. The DC power for the RF power amplifiers (B+) is provided in two controller-selected DC voltage levels: 200Vdc, and 300Vdc. The RF power amplifiers will only be powered from one of these selectable voltage levels at a time. The transmitter’s control system will select which DC power level is used to power the RF amplifiers.
Section 4 Theory of Operation DAX-1/DAX-3 4.4.1.1 AC Mains Input and Transformer Primary The AC input of the B+ power supply is configured to be powered from 220, 230, or 240VAC. Three taps on the primary of the input transformer allow the selection of the correct AC mains voltage input. +/-5% taps are provided on the transformers AC input in order to accommodate installations with low or high AC line voltages. 4.4.1.
Section 4 Theory of Operation DAX-1/DAX-3 conduction angle of the SCRs is increased, raising the DC output voltage. If the DC output voltage increases, the conduction angle of the SCRs decreases, lowering the DC output voltage. Two DC bus voltages are provided by the Power Supply Controller selecting between two sets of transformer secondary taps; these two taps provide the 300V and 200V (variable between 80Vdc and 200Vdc for low power optimization) DC bus voltages.
Section 4 Theory of Operation DAX-1/DAX-3 • Provides over-current protection for the low voltage power supplies (+/-12Vdc, 5Vdc, & +48Vdc) • • • Provides power for the cooling fans Provides DC bus output voltage regulation Provides the DC bus discharge function Figure 4-5 Single Phase Power Supply Controller Block Diagram 4.4.2.1 Main Controller Interface The Power Supply Controller board serves as the control interface between the transmitters Main Controller and the DC power supply.
Section 4 Theory of Operation 4.4.2.2 DAX-1/DAX-3 SCR Firing Board Interface The Power Supply Controller board interfaces with the SCR firing board and provides the SCR enable / disable function and voltage references, which determine the conduction angle of the rectifiers and thus the regulated DC bus voltage. A sample of the B+ output is sent to the SCR firing board from the Power Supply Controller to close the voltage regulation loop. 4.4.2.
Section 4 Theory of Operation DAX-1/DAX-3 components are damaged. Semiconductor fuses are employed to provide this protection function. 4.4.2.5.2 Low Voltage Power Supply The transmitter power supply system includes low voltage switching power supplies, which provide power for the transmitters control circuitry, fans, and Binary PA’s. There are two low voltage power supplies in the system, which provide three DC output voltages: +/-12Vdc and +48Vdc.
Section 4 Theory of Operation 4-12 DAX-1/DAX-3 888-2500-001 WARNING: Disconnect primary power prior to servicing.
DAX-1/DAX-3 Section 5 Maintenance and Alignments 5.1 5 Introduction This section provides maintenance and alignment information for the DAX transmitter. It is intended to be used by qualified technical service personnel only. ! CAUTION: DO NOT ATTEMPT TO REMOVE OR REPLACE ANY COMPONENTS OR BOARDS WITH POWER APPLIED TO THE TRANSMITTER. 5.
Section 5 Maintenance and Alignments 5.2.1.2 DAX-1/DAX-3 Maintenance Logbook The maintenance logbook should contain a complete description of all maintenance activities required to keep the transmitter operational. A list of maintenance information to be recorded and analyzed to provide a database for a failure reporting system is as follows: DISCREPANCY Describe the nature of the malfunction. Include all observable symptoms and performance characteristics.
Section 5 Maintenance and Alignments DAX-1/DAX-3 Pry Slot Removable Media (Part # 448-1231-000) Figure 5-1 DAX-1/DAX-3 Air Filter 5/2/2013 STEP 1 Pry open the filter frame to expose the media STEP 2 Remove media STEP 3 Wash and dry, or replace media as necessary STEP 4 Place clean media into fan frame chassis STEP 5 Press fan frame back into place 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments 5.3 DAX-1/DAX-3 Configuration 5.3.1 Change Remote Disable LED Color Depending on the installation requirements, the color of the Remote Disable LED can be altered from the default. STEP 1 Locate the External I/O board by removing the front panel below the control panel STEP 2 Locate JP1 and set accordingly • Green at disabled remote: 1-2 • Red at disabled remote: 2-3 STEP 3 5.3.
Section 5 Maintenance and Alignments DAX-1/DAX-3 5.3.3 Power Limit Setup The DAX transmitter can be remotely forced to a predetermined power level via the Remote Power Limit Select I/O line, J7-8 on the External I/O board. To set that value use the following procedures. 5.3.3.
Section 5 Maintenance and Alignments 5.4 DAX-1/DAX-3 Software Upgrade Procedure The following section outlines the steps necessary to update the DAX transmitter with a different version of software than currently installed. As with the VT100 programming, a PC and serial cable with DB-9 connector is required. The PC should have the Harris Broadcast software update install CD inserted. IMPORTANT NOTE: The software update will automatically reset the transmitter during the procedure.
Section 5 Maintenance and Alignments DAX-1/DAX-3 5/2/2013 STEP 8 Select program file STEP 9 Using BROWSE, select application file DAX_APP_vvvr.
Section 5 Maintenance and Alignments 5.5 DAX-1/DAX-3 Alignments 5.5.1 VT100 Calibrations and Alignments For all meter readings and programming including and beyond the front panel abilities, the VT100 is the emulation method used to interface a computer with the DAX transmitter. Any parameter accessible on the front panel GUI can also be viewed and modified via VT100.
Section 5 Maintenance and Alignments DAX-1/DAX-3 • EXAMPLE: To change the Forward Power Range of Power Level 4 to 2800W; on page 2 of the VT100 screens, type "4", then use your keyboard’s up or down arrow keys to reach 2800. Then hit "Enter" on your keyboard to store. To toggle (turn on/off) a command: STEP 1 Type the corresponding number or letter in parenthesis - do NOT hit "Enter" • EXAMPLE: To mute the DAX; on page 2 of the VT100 screens, type the letter "e".
Section 5 Maintenance and Alignments 5.5.2.
Section 5 Maintenance and Alignments DAX-1/DAX-3 5.5.2.
Section 5 Maintenance and Alignments STEP 16 DAX-1/DAX-3 On the VT100 page 5, press “I” and lower the Reflected Power Trip to 70W per PA using the down arrow key (see Table 5-4 below) Table 5-4 STEP 16 Power Settings Model Watts DAX-1/1R 70 DAX-3 210 DAX-5 350 DAX-6 420 STEP 17 Still on the VT100 page 5, press "4" and increase the Reflected Power Null, using the up arrow, until the Reflected Power Cal.
Section 5 Maintenance and Alignments DAX-1/DAX-3 STEP 22 Press and hold the ENTER button on the front panel until the LCD screen reverse video appears to store the power setting for that Power Level STEP 23 Repeat for each additional power level This concludes the Forward & Reflect Power Calibrations procedures. 5/2/2013 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments 5.6 DAX-1/DAX-3 Parts Replacement See Section 7, Replaceable Parts List, for part numbers available for replacement. 5.6.1 Power Supply Controller The following procedure explains in detail the necessary steps to replace a Power Supply Controller board. It is recommended that the technician read through these instructions prior to proceeding with this replacement.
Section 5 Maintenance and Alignments DAX-1/DAX-3 Figure 5-4 VT100 Page 5 View STEP 10 On sheet 5 of the VT100 screens hit the “1” key STEP 11 Type in the AC voltage reading from the voltmeter and hit the “Enter” key. The AC voltage is now calibrated.
Section 5 Maintenance and Alignments DAX-1/DAX-3 • DAX-5: 5kW • DAX-6: 6kW STEP 21 On sheet 5 of the VT100 screens hit the “M” key STEP 22 Use the up/down arrow keys on the keyboard to adjust the B+ DAC until the DC voltage reading on the meter of the B+ supply is as close to 300.
Section 5 Maintenance and Alignments DAX-1/DAX-3 Figure 5-5 Meter Screen STEP 30 5.6.2 On the Power Supply Controller board, adjust R47 for a -12V (±5%) reading on this screen SCR Controller Board The following procedure explains in detail the necessary steps to replace an SCR Controller board. It is recommended that the technician read through these instructions prior to proceeding with this replacement.
Section 5 Maintenance and Alignments DAX-1/DAX-3 • DAX-3: 3kW • DAX-5: 5kW • DAX-6: 6kW STEP 15 On page 5 of the VT100 screens hit the “M” key STEP 16 Use the up/down arrow keys on the keyboard to adjust the B+ DAC until the DC voltage reading on the meter of the B+ supply is as close to 300.
Section 5 Maintenance and Alignments DAX-1/DAX-3 STEP 4 Remove the yellow wires from the power supply terminals STEP 5 Unscrew the 2 fasteners holding the mounting plate to the wall STEP 6 Unscrew the power supply to be replaced from the plate STEP 7 Mount new power supply to plate with the screws from STEP 6 STEP 8 Mount plate to wall with the 2 fasteners from STEP 5 STEP 9 Re-attach yellow wires to corresponding terminals noted STEP 10 Reconnect primary power to the transmitter STEP 11 Tur
Section 5 Maintenance and Alignments • 5-20 DAX-1/DAX-3 Beads and insulators are included along with MOSFETs as part of the MOSFET Replacement Kit. 888-2500-001 WARNING: Disconnect primary power prior to servicing.
DAX-1/DAX-3 Section 6 Troubleshooting 6.1 6 Introduction This section is to be used by the service technician to go beyond the steps provided in the Emergency Operation section (in Chapter 3) to troubleshoot a DAX malfunction. Use this along with the provided schematic package for detailed circuit understanding and diagnosis. NOTE: Before preceding, see "3.4 Emergency Operation" on page 3-9 for initial steps in restoring a DAX transmitter to operational status in the event of a fault condition.
Section 6 Troubleshooting 6.2.1 DAX-1/DAX-3 Fault Log Certain faults are listed for quick reference in Table 6-1 on page 6-27. The most recent fault will be displayed as the topmost listing. To assist in determining the possible causes of a malfunction, the DAX transmitter stores fault occurrences including the elapsed time since they occurred. The DAX controller stores 75 fault listings and operates with the first in first out (FIFO) concept of data repletion.
Section 6 Troubleshooting DAX-1/DAX-3 STEP 4 6.2.1.2 If more than three faults are present, they can be viewed by scrolling using the UP or DOWN buttons Fault Log Reset Once the technician has noted faults, it may be desirable to clear the Fault Log. To do so, from the Fault Log screen press and hold the ENTER button for >2 seconds. The listed faults will highlight and then be permanently deleted. 6.2.
Section 6 Troubleshooting DAX-1/DAX-3 STEP 1 Type the line number or letter in parenthesis - do NOT hit "Enter" STEP 2 Use up/down arrow keys to increase/decrease numerical value (with the exception of the Meter Calibration section, where it is required to type in the numerical value) STEP 3 Press the "Enter" key to store that entry • EXAMPLE: To change the Forward Power Range of Power Level 4 to 2800W; on page 2 of the VT100 screens, type "4", then use your keyboard’s up or down arrow keys to reach
Section 6 Troubleshooting DAX-1/DAX-3 6.2.2.1 VT100 - Page 1 Figure 6-3 VT100 Page 1 View 6.2.2.1.1 SYSTEM Forward Power: Transmitter output power measured using an RF detector on the Output Monitor board. Forward power is limited to 115% of rated power. NOTE: Forward power detector calibration is available using (3) on VT100 page 5 (see "6.2.2.5 VT100 - Page 5" on page 6-16). Reflected Pwr: Reflected power to the transmitter measured using a detector on the Output Monitor board.
Section 6 Troubleshooting DAX-1/DAX-3 NOTE: DC Voltage calibration is available using (2) on VT100 page 5 (see "6.2.2.5 VT100 - Page 5" on page 6-16). DC Current: High voltage power supply DC current measured using the shunt in the HVPS. No calibration required. Nominal DC current is approximately 4.5A per kW with program modulation. NOTE: Instantaneous DC current trip point is factory set to 9.0A per PA module using (O) on VT100 page 5 (see "6.2.2.5 VT100 - Page 5" on page 6-16).
Section 6 Troubleshooting DAX-1/DAX-3 • • Band B – 760kHz – 1109kHz Band C – 1110kHz – 1705kHz Exciter/IO Rev: Indicates the board revisions for the Exciter/Controller board / External I/O board. SW Rev: Indicates the present software revision installed in the transmitter Exciter/ Controller board. Fan 1, 2: Indicates the actual fan speed of the transmitter cooling fans. Normal operation is approximately 100Hz. Fault occurs below 80 Hz. 6.2.2.1.2 CURRENT STATUS PA 1 - 6: Indication of PA module status.
Section 6 Troubleshooting DAX-1/DAX-3 Security Key: NA indicates the optional Security Key is not installed on the PA Motherboard. When installed, the Security Key enables advanced correction, digital mode operation, and distortion reduction techniques in the transmitter. Display is NA or OK. 6.2.2.1.3 METERS Exhaust Temp: Temperature measured on the Output Monitor board. Temperature Fault (OM TEMP) occurs at 62º C. V+ DTG: Dead Time Generator adjustment voltage measured on the Exciter/ Controller.
Section 6 Troubleshooting DAX-1/DAX-3 6.2.2.2 VT100 - Page 2 Figure 6-4 VT100 Page 2 View 6.2.2.2.1 Remote Control NOTE: All remote functions with the exception of (B) Off and (E) Mute are ignored when the transmitter user interface Remote Enable is OFF. (A) On: Pressing ‘A’ will turn the transmitter ON. (B) Off: Pressing ‘B’ will turn the transmitter OFF. (C) Raise: Pressing ‘C’ will raise the output power of the transmitter. (D) Lower: Pressing ‘D’ will lower the output power of the transmitter.
Section 6 Troubleshooting DAX-1/DAX-3 (H) Primary PA (DAX-1R only): Allows switching of on-air PA module. ‘A’ selects bottom PA as primary, ‘B’ selects top PA as primary. NOTE: The actual switching of PAs does not take place until the DAX transmitter is restarted, which can simply be pushing the ON button while the transmitter is running. 6.2.2.2.2 Power Settings (1) Level 1: Pressing ‘1’ changes the transmitter power setting to Level 1.
Section 6 Troubleshooting DAX-1/DAX-3 6.2.2.3 VT100 - Page 3 Figure 6-5 VT100 Page 3 View - Fault Log NOTE: See "6.4 Fault Log Listing" on page 6-27 of this chapter to view the complete listing of possible DAX transmitter faults. This table also includes a description of each fault and an explanation of the transmitter’s response to the fault. INDEX – Up to 75 faults can be logged into the circular fault log. When 75 has been reached the oldest fault will be discarded when a new fault occurs.
Section 6 Troubleshooting DAX-1/DAX-3 NOTE: Note that pressing ‘R’ resets the fault log. Pressing UP/DOWN arrow keys scroll thru the fault log. 6.2.2.4 VT100 - Page 4 Figure 6-6 VT100 Page 4 View 6.2.2.4.1 SETUP (A) Power Level 1: Pressing ‘A’ will allow the user to raise or lower the desired power range setpoint for Power Level 1 using the UP/DOWN arrow keys.
Section 6 Troubleshooting DAX-1/DAX-3 (F) Mod. Mon. Level 1: Pressing ‘F’ will allow the user to raise or lower the Mod Monitor output signal on the External I/O board BNC connector when the transmitter is ON in Power Level 1. The UP/DOWN arrow keys are used raise/lower the output signal. (G) Mod. Mon. Level 2: Pressing ‘G’ will allow the user to raise or lower the Mod Monitor output signal on the External I/O board BNC connector when the transmitter is ON in Power Level 2.
Section 6 Troubleshooting DAX-1/DAX-3 HOLD will stop the filter adaptation and keep the present equalization filter in effect. The equalization filter, however, will be lost on an interruption of AC power. DEFAULT retrieves the saved PDM filter from the selected non-volatile ePDM Default Table. This filter will be restored upon reapplication of AC power. BYPASS will disable all ePDM filter correction.
Section 6 Troubleshooting DAX-1/DAX-3 (U) Remote Power Limit: Remote power limit establishes the maximum output power of the transmitter when the RMT POWER LIMIT SEL input on the External I/O customer interface is active. Pressing ‘U’ will allow the user to raise or lower the power limit using the UP/DOWN arrow keys. (V) Digital Mode Analog BW: Digital Mode Analog Bandwidth sets the amount of frequency content required for the adaptive ePDM filter correction to equalize.
Section 6 Troubleshooting 6.2.2.5 ! DAX-1/DAX-3 VT100 - Page 5 CAUTION: CHANGING PARAMETERS ON THIS PAGE CAN CAUSE PERMANENT DAMAGE TO THE TRANSMITTER IF SUBSEQUENT PROPER SETUP PROCEDURES ARE NOT PERFORMED. NOTE: This section is primarily for informational purposes only. The only parameters that might be altered would be those indicated as part of a procedure described within this manual. Figure 6-7 VT100 Page 5 View 6.2.2.5.
DAX-1/DAX-3 Section 6 Troubleshooting (B) DAX Model: Pressing ‘B’ will allow the user to change the model of the transmitter using the UP/DOWN arrow keys. Selection of DAX-6, DAX-5, DAX-3, DAX-1, and DAX-1R is available. (C) # of Phases: Allows the user to specify the transmitter AC input phase as either Single or Three. Changing the # of phases requires the user to recalibrate the Power Supply Low Tap Calibration using (N) PSTAPLOW CAL on VT100 page 5 (described below).
Section 6 Troubleshooting DAX-1/DAX-3 (K) Training: 1 2 3 4 5: Pressing ‘K’ initiates the automated off-line training sequence for NL (AM to AM) & PM (AM to PM) correction. NOTE: Prior to training, the user should have stored the range setpoints for all 5 power levels and terminated the transmitter into a dummy load. The training sequence requires approximately 2-3 minutes to complete.
Section 6 Troubleshooting DAX-1/DAX-3 (4) Reflected Power Null: Pressing ‘4’ allows the user to enter a voltage offset to compensate for any bias voltage present on the reflected power detector. Factory use only (5) Reflected Power Cal.: Pressing ‘5’ allows the user to calibrate the reflected power displayed on both the transmitter user interface and the VT100. 6.2.2.5.3 B+ CAL (M) 300V B+ DAC: Pressing ‘M’ allows the user to adjust the HVPS B+ voltage to 300Vdc when in the high transformer tap.
Section 6 Troubleshooting 6.2.2.6 ! DAX-1/DAX-3 VT100 - Page 6 CAUTION: CHANGING PARAMETERS ON THIS PAGE CAN CAUSE PERMANENT DAMAGE TO THE TRANSMITTER IF SUBSEQUENT PROPER SETUP PROCEDURES ARE NOT PERFORMED. NOTE: This section is primarily for informational purposes only. The only parameters that might be altered would be those indicated as part of a procedure described within this manual.
DAX-1/DAX-3 Section 6 Troubleshooting FPGA Ctrl: Internal FPGA Control Register. Displayed as an aid in troubleshooting only. REF Mem. Ctrl: Internal FPGA Reference Memory Controller register. Displayed as an aid in troubleshooting only. Prog.. Div.: Internal FPGA Programmable Divide register. Displayed as an aid in troubleshooting only. UART1 Status: Internal FPGA Universal Asynchronous Receiver/Transmitter (UART) register. Displayed as an aid in troubleshooting only.
Section 6 Troubleshooting DAX-1/DAX-3 6.2.2.6.2 Test Tone Setup (1) Amplitude: Pressing ‘1’ allows the user to raise or lower the level of modulation of the test tones used in the off-line training sequence using the UP/DOWN arrow keys. In normal operation set to 9000. (2) # of Tones: Pressing ‘2’ allows the user to raise or lower the number of test tones used in the off-line training sequence using the UP/DOWN arrow keys. In normal operation set to 14.
Section 6 Troubleshooting DAX-1/DAX-3 6.2.2.6.3 AM2PM Delay Calibration (J) Manual: Pressing ‘J’ allows the user to adjust the AM/PM (PM Correction) delay in the Exciter/Controller. This delay compensates for the inherently longer delay in the audio path with respect to the carrier delay thru the transmitter and allows the phase correction based on amplitude to re-align with the amplitude at the PA module.
Section 6 Troubleshooting 6.3 DAX-1/DAX-3 General Troubleshooting Information 6.3.1 Schematics, Wiring and Block Diagrams The following schematic and signal name conventions apply: • Active Low = "/" - A signal name preceded by the forward slash is an active low. Example: /TEMP_FAULT means the Temp Fault signal is active when at a low state (also known as TEMP_FAULT ’not’, or TEMP_FAULT ’bar’).
Section 6 Troubleshooting DAX-1/DAX-3 power reduction. This series of events will continue until 20% of TPO is reached, at which time the DAX transmitter will be faulted off. If, at some time during the foldback process - but before the DAX is shut down, the fault condition clears, the transmitter will begin a ramping up process. If the ON, OFF, RAISE or LOWER buttons are pressed the foldback condition will clear. 6.3.
Section 6 Troubleshooting DAX-1/DAX-3 STEP 2 Insert PA module key card in slot BELOW module to be removed - PA Module LED will turn amber STEP 3 Unscrew right and left thumbscrews STEP 4 Remove module STEP 5 Install PA module verified in STEP 1 and tighten thumbscrews STEP 6 Remove PA module key card NOTE: PA module may take up to 45 seconds before soft start is complete and module turns ON. 6.3.5.
Section 6 Troubleshooting DAX-1/DAX-3 6.4 Fault Log Listing Table 6-1 DAX Faults Listing (in alphanumeric order) ACTION / INDICATION NAME DESCRIPTION +12V Occurs with any positive voltage outside the +13.2Vdc to +10.8Vdc range Transmitter turns off -12V Occurs with any negative voltage outside the -13.2Vdc to -10.8Vdc range Transmitter turns off +48V Occurs with any voltage above +52.8Vdc or below +43.2Vdc Transmitter turns off +5V Occurs with any voltage above +5.5Vdc or below +4.
Section 6 Troubleshooting Table 6-1 NAME DAX-1/DAX-3 DAX Faults Listing (in alphanumeric order) DESCRIPTION ACTION / INDICATION DC AMP PEAK HVPS B+ DC peak current has exceeded the 9.0A per PA module factory set trip point Transmitter 3-strikes off requiring operator restart DC CURRENT HVPS B+ average current calculated by the DSP has exceeded the 7.
Section 6 Troubleshooting DAX-1/DAX-3 Table 6-1 NAME DAX Faults Listing (in alphanumeric order) DESCRIPTION ACTION / INDICATION -MODLTN WRN Pre-FPGA processor negative overload Warning indication only Check input signal level and exciter controller R39 setting OM INTLOCK Indication of Output Monitor interlock condition Interlock LED illuminates and DAX is shut off Temperature of Output Monitor, in output network, has exceeded 62°C threshold Transmitter turns off PA (x) BRIDGE Faulted RF drive s
Section 6 Troubleshooting Table 6-1 NAME DAX-1/DAX-3 DAX Faults Listing (in alphanumeric order) DESCRIPTION ACTION / INDICATION RF CARRIER Indication of a low amplitude external RF carrier (currently selected: "Carrier Input" or "Digital Phase Input") signal Threshold is <2.
Section 6 Troubleshooting DAX-1/DAX-3 6.5 Power Supply System Troubleshooting ! WARNING: DISCONNECT PRIMARY POWER PRIOR TO SERVICING THE POWER SUPPLY SYSTEM OR THE POWER SUPPLY CONTROLLER BOARD. This section is to further assist the technician in troubleshooting a possible power supply system malfunction. Refer to the DAX schematic package and the AC/DC Flow Block Diagrams, Figure 6-8 on page 6-32.
Section 6 Troubleshooting DAX-1/DAX-3 Figure 6-8 AC/DC Flow Block Diagram 6-32 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting DAX-1/DAX-3 6.6 PA Troubleshooting This section is to further assist the technician in troubleshooting a probable RF power malfunction. Refer to the DAX schematic package. For PA Module removal see "6.3.5 On-Air PA Module Service" on page 6-25 above. Figure 6-9 RF Flow Diagram 6.6.1 PA Module Faults Green - Indicates the PA is on Amber - Indicates the Hot-Swap key is installed (to remove a PA) Red - Indicates a PA module fault 6.6.
Section 6 Troubleshooting 6.7 DAX-1/DAX-3 Audio Troubleshooting This section provides a block diagram to assist the technician in troubleshooting a possible audio signal malfunction. Refer to the DAX schematic package and Figure 610. Figure 6-10 Audio Flow Diagram 6-34 888-2500-001 WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting DAX-1/DAX-3 6.8 Exciter/Controller Troubleshooting If pressing the ON or OFF button for 5 seconds, and pressing switch S5 has not resolved a possible control problem, take the following steps to reseat the Filter Board. STEP 1 Turn off CB1 STEP 2 Remove AC Mains power STEP 3 Remove front panel if not already removed STEP 4 Carefully but firmly reseat filter board STEP 5 Reapply power STEP 6 Test 6.8.0.
Section 6 Troubleshooting 6.9 DAX-1/DAX-3 Testpoint Listing The following table lists the pertinent testpoints and LEDs for each board of the DAX transmitter and provides its function and nominal value when applicable. NOTE: Ground test points are not listed, however, be sure to use correct ground type if multiple ground types are noted. Table 6-2 On Board...
Section 6 Troubleshooting DAX-1/DAX-3 Table 6-2 On Board... DAX Testpoint & LED Information Table (All voltages listed are ±5%) Name TP(n) or LED Function, Display and/or (Comment) or (Related Potentiometer) Nominal Value External I/O DC VOLT ADJ TP19 Power supply control signal Set by Exciter/Controller board (Varies with RF power output level) 0 - 9Vdc External I/O +3.3V TP20 Onboard regulation - IC +3.3Vdc DS10 Green LED illuminates to indicate +3.
Section 6 Troubleshooting Table 6-2 DAX-1/DAX-3 DAX Testpoint & LED Information Table (All voltages listed are ±5%) On Board...
Section 6 Troubleshooting DAX-1/DAX-3 Table 6-2 DAX Testpoint & LED Information Table (All voltages listed are ±5%) On Board...
Section 6 Troubleshooting Table 6-2 On Board...
Section 6 Troubleshooting DAX-1/DAX-3 Table 6-2 On Board... DAX Testpoint & LED Information Table (All voltages listed are ±5%) Name TP(n) or LED Function, Display and/or (Comment) or (Related Potentiometer) Nominal Value 1-phase PS Controller -12V TP8 From onboard switching supply -12Vdc 1-phase PS Controller +5V TP9 Onboard regulation - IC +5Vdc 1-phase PS Controller XFMR SECONDARY SAMPLE TP11 TP12 Transformer secondary low tap sample. Measured across TP11 and TP12.
Section 6 Troubleshooting 6-42 888-2500-001 WARNING: Disconnect primary power prior to servicing.
DAX-1/DAX-3 Section 7 Parts List 7.
Section 7 Parts List DAX-1/DAX-3 Table 7-1 !FORMAT XMTR, AM DAX-1/1R/3 - 994 9823 001 (S) Harris PN 200000000000001704 200000000000001705 200000000000001706 200000000000001707 200000000000001708 200000000000001709 200000000000001710 200000000000001711 200000000000001712 200000000000001713 200000000000001714 200000000000001715 200000000000001716 200000000000001717 200000000000001718 200000000000001719 200000000000001720 200000000000001721 200000000000001722 200000000000001723 200000000000001724 20000000000
Section 7 Parts List DAX-1/DAX-3 992 9994 115 992 9994 127 992 9994 130 992 9994 132 992 9994 133 992 9994 138 KIT, 3KW, PA, PS, 60HZ KIT,RACK DAX 1/1R/3 KIT, SPARE FUSE & SEMI DAX-1/1R KIT, DAX FREQUENCY CHANGE, 1KW KIT, DAX FREQUENCY CHANGE, 3KW KIT, SPARE FUSE, DAX-1/1R 0 EA 0 EA 0 EA 0 EA 0 EA 0 EA Table 7-2 KIT, 1KW, SINGLE PA, PS, 50HZ - 200000000000001765 (D) Harris PN 472 1834 000 612 0233 000 917 2574 059 939 8234 041 939 8234 059 943 5573 047 943 5573 089 9929994009T 992 9994 060 992 9994 066
Section 7 Parts List 506 0308 000 506 0309 000 506 0311 000 506 0316 000 508 0717 000 516 0081 000 522 0658 000 560 0121 007 574 0543 000 604 0852 000 610 1334 000 610 1372 000 610 1498 000 646 2110 000 843 5572 001 922 1310 001 922 1344 004 922 1344 005 922 1344 006 943 5573 001 943 5573 132 992 9994 010 CAP 0.180UF 5% 630VDC CAP 0.220UF 5% 630VDC CAP 0.033UF 5% 1000VDC CAP 0.068UF 400V 5% CAP, 0.15UF 600VDC 10% CAP, DISC 0.01UF 1KV 20% CAP, 220UF 400V 20%, SNAP-MT POSISTOR 0.
Section 7 Parts List DAX-1/DAX-3 735 0041 001 736 0376 001 736 0377 001 917 2574 020 917 2574 021 922 1344 030 922 1344 031 922 1344 046 939 8234 039 939 8234 056 939 8234 063 943 5573 083 943 5573 084 943 5573 085 943 5573 125 943 5573 152 952 9234 008 992 8553 012 992 9994 013 992 9994 020 FIRING BD, 1-PH RECT, 50HZ PSU, SW, 240W +12VDC PSU, SW, 240W +48VDC PWR SUPPLY AC CABLE CABLE, PWR SUPPLY CONTROL BLOCK, TERMINAL STUD SPACER MOUNTING BRACKET BRACKET, CIRCUIT BREAKER BRACKET, CROWBAR BRACKET, LVPS P
Section 7 Parts List DAX-1/DAX-3 380 0828 000 382 0184 000 382 0428 000 382 0463 000 382 0594 000 382 0656 000 382 0774 000 382 1070 000 382 1128 000 382 1218 000 382 1598 000 382 1649 000 382 1653 000 382 1708 000 384 0205 000 384 0253 000 384 0720 000 384 0780 000 384 0802 000 384 0803 000 384 0986 000 384 1159 000 386 0082 000 386 0083 000 386 0135 000 386 0148 000 386 0404 000 398 0087 000 398 0089 000 398 0368 000 398 0585 000 398 0598 000 398 0621 000 402 0129 000 402 0220 000 404 0904 000 404 0907
Section 7 Parts List DAX-1/DAX-3 540 1600 418 540 1600 501 546 0313 000 548 0345 000 548 2346 000 548 2347 000 548 2351 000 548 2360 000 548 2400 001 548 2400 101 548 2400 134 548 2400 137 548 2400 201 548 2400 247 548 2400 301 548 2400 305 548 2400 330 548 2400 332 548 2400 337 548 2400 339 548 2400 347 548 2400 359 548 2400 361 548 2400 385 548 2400 401 RES 51K OHM 3W 5% RES 100K OHM 3W 5% RES 50 OHM 5W 5% RES 15K OHM 7W 1% RES 68.1K OHM 3W 1% RES 110K OHM 3W 1% RES, 301K OHM 3/4W 0.1% RES, 2.
Section 7 Parts List 314 0007 000 335 0059 000 335 0236 000 354 0819 000 354 0905 000 358 3861 001 522 0528 000 522 0567 000 524 0381 000 548 2400 201 560 0121 011 610 0900 000 610 0982 000 610 1043 000 610 1334 000 610 1411 002 612 1184 000 612 2128 000 612 2139 002 620 0700 000 843 5572 231 843 5572 233 922 1344 007 922 1344 039 LOCKWASHER, SPLIT #10 SST (ANSI) WASHER FLAT NYLON #6 HOLE WASHER SHOULDER 0.
Section 7 Parts List DAX-1/DAX-3 Table 7-14 PS ASSY, 50HZ, DAX 3KW - 992 9994 067 (U) Harris PN 200000000000000956 200000000000000960 200000000000001521 200000000000001622 200000000000001752 358 0003 000 358 3614 000 358 3845 000 384 0705 000 384 1171 000 398 0557 000 476 0441 000 540 1600 201 542 1738 000 610 1253 000 612 1451 000 735 0041 001 736 0376 001 736 0377 001 917 2574 020 917 2574 021 917 2574 065 922 1344 024 922 1344 030 922 1344 031 922 1344 046 939 8234 039 939 8234 056 939 8234 063 943 557
Section 7 Parts List DAX-1/DAX-3 Table 7-16 BASIC, DAX-1/1R/3 AM XMTR - 992 9994 065 (AG) Harris PN 200000000000000255 200000000000000317 200000000000000958 200000000000001190 200000000000002042 200000000000002230 296 0258 000 335 0294 000 350 0063 000 354 0003 000 354 0324 000 358 1974 000 358 2589 000 358 2628 000 358 3248 000 358 3744 000 358 3837 000 396 0261 000 410 0019 000 414 0302 000 424 0016 000 424 0025 000 424 0360 000 424 0410 000 430 0291 000 448 1231 000 464 0349 000 494 0516 000 516 0204 0
Section 7 Parts List DAX-1/DAX-3 943 5573 090 952 9234 006 952 9234 007 971 0025 002 992 9994 005 992 9994 016 992 9994 030 992 9994 055 992 9994 106 GROUND STRAP WALL, RIGHT WALL, LEFT B+ SAMPLE TERM BD MTG, PWA, EXCITER/CONTROLLER *PWA, EXTERNAL I/O PWA, OUTPUT MONITOR PWA, SECURITY KEY PWA, RF SAMPLE DIVIDER 1 EA 1 EA 1 EA 1 EA 1 EA 1 EA 1 EA 1 EA 1 EA A4 A5A1 A8A10 Table 7-17 PWA, EXCITER/CONTROLLER - 992 9994 005 (K) Harris PN 000 0000 010 444 3032 000 522 0588 000 610 0900 000 610 1069 000 610 12
Section 7 Parts List DAX-1/DAX-3 Table 7-19 PWA, OUTPUT MONITOR - 992 9994 030 (K-) Harris PN 354 0881 000 358 2635 000 358 3861 001 382 0593 000 382 0707 000 382 1679 000 384 0205 000 384 0321 000 384 0882 000 386 0053 000 386 0082 000 386 0406 000 386 0472 000 494 0239 000 494 0333 000 494 0414 000 500 0883 000 500 0902 000 516 0453 000 516 0484 000 516 0533 000 516 0970 000 522 0550 000 522 0573 000 540 1600 210 540 1600 213 540 1600 215 548 2400 117 548 2400 134 548 2400 230 548 2400 293 548 2400 301
Section 7 Parts List DAX-1/DAX-3 Table 7-21 KIT, 1KW, SINGLE PA,PS, 60HZ - 992 9994 113 (H) Harris PN 200000000000001768 472 1834 000 612 0233 000 917 2574 059 939 8234 041 939 8234 059 943 5573 047 943 5573 089 9929994009T 992 9994 060 Description PS ASSY, 60HZ, DAX 1KW XFMR, 220V PRI, 2.
Section 7 Parts List DAX-1/DAX-3 Table 7-24 KIT, 3KW, PA, PS, 60HZ - 992 9994 115 (G) Harris PN 200000000000001769 358 3744 000 358 3837 000 472 1833 000 620 1906 000 843 5572 043 843 5572 053 917 2574 061 939 8234 060 943 5573 002 943 5573 006 943 5573 079 9929994009T 992 9994 072 Description PS ASSY, 60HZ, DAX 3KW CARD GUIDE 8"LG, CARD GUIDE, SNAP-IN XFMR, 220V PRI, 6.
