Series 945 Preamp/Tuner
NOTICE - IMPORTANT SAFETY INFORMATION The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons. RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
12. CLEANING The equipment should be cleaned only as detailed in the operating instructions. 13. OBJECT AND LIQUID ENTRY Care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the enclosure of the equipment. 14. DAMAGE REQUIRING SERVICE Hafler equipment should be serviced by qualified service personnel when: A. The power supply cord or plug has been damaged, or B. Objects have fallen, or liquid has been spilled into the equipment, or C.
TABLE OF CONTENTS PERFORMANCE SPECIFICATIONS ............................................................................................... General Information .................................................................................................................. INSTALLATION Rackmounting ............................................................................................................................ Ventilation/Placement ...............................................................
PERFORMANCE SPECIFICATIONS All specifications are for 20 Hz - 20 kHz unless specified otherwise. LINE AMPLIFIER (Measured at Line Out) FREQUENCY RESPONSE: +O.l dB (into 33,000 ohms) BANDWIDTH: 10 Hz - 150 kHz, -3 dB, into 1 Ok ohm load MAXIMUM OUTPUT: 5 volts RMS TOTAL HARMONIC DISTORTION AND NOISE: 0.02% @ 2 volts RMS SEI\ISITIVITY (For 0.
REMOTE CONTROLS: Up/Down Volume, Up/Down Tuning, Preset Next, Preset ‘1 ‘, Preset ‘11’: Video Input Selectors, Tape 1, Tape 2/EPL, Power, AM/FM Selector, Tone In, Mute. Audio/ CONVENIENCE OUTLETS: 120 VAC MODELS: 1 Polarized Unswitched, 2 Polarized Switched, 1 Grounded Switched 240 VAC MODELS: 1 Reverse-IEC Unswitched, 2 Reverse-IEC Switched PHYSICAL DIMENSIONS: 17” Wide x l l-3/5” Deep x 2-l/2” High (excluding feet); Faceplate 17” or 19” Wide 43.2 cm Wide x 29.5 cm Deep x 6.
, 15 14 RP P P 16 945 PREAMP/TUNER FRONT PANEL VIEW
FRONT PANEL CALL-OUTS 1. POWER SWITCH -lights amber when in READY mode. -lights green when in ON mode. 2. INFRARED RECEIVER WINDOW 3. MEMORY PRESETS (l-9) -press to store AM/FM stations l-9 into memory. (See #6) -press to recall AM/FM stations l-9 from memory. 4. +lO PRESET SHIFT (11-19) -press simultaneously with PRESETS l-9 to store AM/FM stations 1 l-19 into memory. (See #6) -press simultaneously with PRESETS l-9 to recall AM/FM stations 1 l-19 from memory. 5.
VIDEO RECORD TAPE 1 LINE OUT LEFT CHANNEL ANTENNA BRACKET RIGHT CHANNEL +, OUT IN A/V IN VIDEO IN ,+ 3 2 M:%:R 1 3 -@@@@@@@@@@ 1 SWITCHED OUTLETS AC LINE VOLTAGE RATING 1 @@@@@ *@@@@Q@@@@ 1 ,A, @ @@@@ I I O?JT It!4 Y T A P E 2/EPL A/V OUT cL FM ,?r 4 YANT 75 OHM F M A N T 300 OHM 945 PREAMP /TUNER REAR PANEL VIEW 120 VAC VERSION UNSWITCHED ’ L I N’ E C O R D OUTLET CONNECTOR
VIDEO RECORD TAPE 1 LINE OUT LEFICHANNEL RIGHT I CHANNEL +, OUT IN A/V IN VIDEO IN ,+ 3 2 Mtf?I::R +, 1 3 2 SWITCHED OUTLETS 1 ObT Ikl Y T A P E 2/EPL A/V OUT CD FM I UNSWITCHED OUTLET ANT 300 OHM 945 PREAMPTTUNER REAR PANEL VIEW 240 VAC VERSION AC LINE VOLTAGE RATING I LINE CORD CONNECTOR
PREAMP /TUNER REMOTE CONTROL 1. VOLUME -press left volume button for decreased volume. -press right volume button for increased volume. -pressing either volume button defeats MUTE. 7. TAPE SELECTORS -press to select TAPE 1 or TAPE 2/EPL. Button on front panel lights red to indicate selected function. (See text for important operating details.) 2. TUNE -press left button to change tuner down in frequency. -press right button to change tuner up in frequency.
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ANTENNA CONNECTIONS A simple "T" shaped dipole ribbon antenna has been provided for FM reception. Connect its leads to the rear panel terminals marked “FM 300 OHM”. For best results, the “arms” of this antenna should be fully extended, and mounted flat against a wall or equipment cabinet. A “loop” type antenna has been provided for AM reception. It is to be connected to the rear panel terminals marked “AM ANT” and “GND”. This antenna is attached at one end by a snap-in hinge.
TAPE INPUTS and TAPE OUTPUTS The 945 incorporates two Tape Loops for use with audio tape decks or other input/output signal processors. Due to the great flexibility of connection and control, the Tape Loops are probably the most complicated portion of the 945 to understand and operate. Therefore, a thorough reading of this section is strongly recommended. Consultation of the Functional Block Diagram will aid in understanding the signal flow inside the unit.
Activating the Tone Controls may cause a slight change in tonal balance even when both Bass and Treble controls are in their center detented position, and therefore the Tone System should be disabled via the switch when no tone control action is desired. The tone controls also limit the total bandpass of the line amplifier.
UP/DOWN TUNING and AUTO SELECTOR Pressing the left tuning button will change the station frequency down the band. Pressing the right button will change the station frequency up the band. The Auto Selector controls whether the tuning buttons will change the station frequency by one channel spacing (Manual Mode), or automatically move to the next usable station (Auto Mode). The status of this mode is indicated in the display window by the logo “AUTO”.
CIRCUIT DESCRIPTION REMOTE RECEIVER and CONTROL LOGIC AUDIO LINE LEVEL INPUT SELECTOR SYSTEM The Remote Receiver circuitry decodes the infrared pulses received from the Remote Control via the front panel Infrared Receiver. This decoded information is sent to the Control Logic, which controls all internal signal routing and Front Panel indicators. The Control Logic also receives input commands from the Front Panel buttons.
HEADPHONE AMPLIFIER The Headphone Amplifier utilizes a separate special purpose operational amplifier to drive the high current demands of headphone operation. This provides the extra power necessary for driving difficult headphone loads, and leaves the main signal path uncompromised for signals to power amplifiers. The Headphone jack is equipped with a sensing switch that automatically turns off the Line Output when headphones are plugged in.
WARNING: The use of ground adaptors (with the ground tab or wire of the adaptor disconnected) will eliminate the safety feature of the grounded power cord. This safety feature is intended to reduce the risk of electric shock-should an internal fault in the equipment result in an electrically “live” chassis. Therefore, this method of ground isolation should be employed only when absolutely necessary, rather than as a general practice.
AM ANTENNA The loop antenna supplied will offer excellent reception in most situations. It is a directional antenna, requiring orientation perpendicular to the radio station’s transmitter. Because of its directional behavior, it will offer the quietest (least background noise) signal on high to medium strength stations, compared to a straight wire antenna.
