Programmes After Market Services NSD-5 Series Transceivers 10.
NSD-5 10.
PAMS Technical Documentation NSD-5 10. Troubleshooting Contents Page No Troubleshooting ............................................................................................................. 5 Baseband Troubleshooting............................................................................................. 5 Main Circuit Sections..................................................................................................... 5 Power Circuitry ................................................
NSD-5 10. Troubleshooting PAMS Technical Documentation Introduction ................................................................................................................24 Reference Documents ................................................................................................24 WinTesla General Set Up ............................................................................................ 25 CDMA Fault-finding Set Up ..............................................................
PAMS Technical Documentation NSD-5 10. Troubleshooting Troubleshooting Baseband Troubleshooting Each main portion of the circuit will be described in enough detail for the troubleshooter to determine whether or not that part of the circuit being evaluated is functional. It will be helpful to use the placement diagram, which illustrates all of the necessary testpoints in the baseband circuit, to troubleshoot the phone. The placement diagram is intended to be used concurrently with this document.
NSD-5 10. Troubleshooting PAMS Technical Documentation 2. RF Regulators (VR1–VR7) VR1 through VR6 are referred to as the RF regulators. Most are switchable, and all should be within 2.67 – 2.85V when they are on (2.8V nominal). VR1 and VR6 are always on during CCONT’s power on mode. The rest of the regulators are switchable and are normally on during one or more of the various phone states, but may be turned on at any time with the service software in order to verify their output.
PAMS Technical Documentation NSD-5 10. Troubleshooting detection). These readings can be accessed through the service software. Check for shorts or opens on the resistor networks connected to these signals if the flash align test software reports that they are out of range. Watchdog CCONT’s watchdog circuitry consists of an 8-bit down counter that causes CCONT to power down when zero is reached. The counter may be reset by loading a new, non–zero value into the watchdog register via CCONT’s serial bus.
NSD-5 10. Troubleshooting PAMS Technical Documentation 1Hz or at 32Hz, with varying duty cycles, and should only be active when a charger is detected. The frequency depends on charger type. To verify correct operation of CHAPS, monitor the charging current (ICHAR) with the service software. When the PWM is off, current should be approximately 200uA. When the PWM is on, it must be greater than approximately 300mA. CAFE The CAFE ASIC performs various functions with respect to the RF circuitry and audio.
PAMS Technical Documentation NSD-5 10. Troubleshooting puts only digital signals, a PDM RC circuit is used to convert the digital output signal to an average analog voltage. A PDM line will always have a series resistor followed by a shunt capacitor. The output of the MAD4 PDM lines will appear as squarewave signals. However, after the shunt capacitor, the signals will appear to be DC with perhaps a slight ripple.
NSD-5 10. Troubleshooting PAMS Technical Documentation Troubleshooting Instructions The first thing to do is to carry out a thorough visual check of the module. Make sure that there is no mechanical damage and that solder joints are okay. Most failures will be the result of SMD errors. Common errors include: solder placed where it shouldn’t be, parts sliding off their pads, or parts placed incorrectly. A good visual inspection will pinpoint a large percentage of failing phones.
PAMS Technical Documentation NSD-5 10.
NSD-5 10. Troubleshooting PAMS Technical Documentation Check Sleep Clock Figure 2: Sleep clock picture In the Field Although solder joints may be adequate to pass manufacturing requirements, they may not withstand mechanical stress or heat cycling. Cracked or broken solder may cause failures to occur as the result of simple use.
PAMS Technical Documentation NSD-5 10. Troubleshooting Power up sequence test: CCONT digital parts keep MAD4 in reset by keeping PURX down for a delay of 62ms. Here is the start-up sequence picture: Ch1 = PWRONX Ch2 = SLEEPCLK Ch3 = PURX Ch4 = RESETX Phone is Totally Dead The phone doesn’t take current at all when the power switch is pressed or when the watchdog disable pin (TPD331) is grounded. Make sure that the battery voltage you use is within specification (i.e., 3.2 - 4.2V).
NSD-5 10. Troubleshooting PAMS Technical Documentation Check that the 32kHz clock turns on when attempting to power up. Check the power circuitry. This includes Vbat, Vref, and all of the linear regulators. Power Doesn’t Stay on or Phone is Jammed If this type of fault occurs after flash programming, there are most likely open joints in ICs. Solder the IC joints. Normally, the power will be switched off by CCONT(N302) after 30 seconds if the CCONT watchdog cannot be served by software.
PAMS Technical Documentation NSD-5 10. Troubleshooting Verify that the CAFÉ EARP and EARN bias is on. If necessary, check the entire receive path—Rx voice data comes from the RF through the RXIQ bus (CDMA), then to MAD4 through RXD (11:0) (Refer to schematic). The Rx voice data then goes back to CAFE on CAFESIO (0), and then to the earpiece or XEAR. CAFESIO (2) must also be active. Conversely, if the transmit audio is not working, the fault could be anywhere in the transmit path.
NSD-5 10.
PAMS Technical Documentation Issue 1 05/02 Nokia Corporation NSD-5 10.
NSD-5 10. Troubleshooting PAMS Technical Documentation Battery Will Not Charge If the battery won’t charge (phone doesn’t allow the battery to charge), check CHAPS and the charging circuit. It may also be necessary to verify the A/D functionality of CCONT since this is the method of detecting battery type, charger type, etc.
PAMS Technical Documentation NSD-5 10. Troubleshooting Baseband Test Points Test point Signal name General characteristics General signal destination 1 VSIM CCONT regulator output (2.8V-3.
NSD-5 10. Troubleshooting PAMS Technical Documentation Test point Signal name General characteristics General signal destination 28 Vref CCONT regulator output (typical 1.244V) From CCONT to CAFE and battery I/ F 29 CRB 32.768KHz From 32K crystal to CCONT 30 Vbb Baseband supply voltage (2.8V typical) From CCONT to MAD4 and memories 31 VR3 CCONT regulator output 2(typical 2.8V) From CCONT to RF receiver 32 VR4 CCONT regulator output 2(typical 2.
PAMS Technical Documentation NSD-5 10.
NSD-5 10.
PAMS Technical Documentation NSD-5 10.
NSD-5 10. Troubleshooting PAMS Technical Documentation RF Troubleshooting Purpose This section is intended to help the troubleshooter quickly determine and fix problems with NSD-5 phones that have failed in the field. Introduction This document is written for use in conjunction with the WinTesla Tuning and Testing software. Screen shots of the menu structures are shown throughout the document.
PAMS Technical Documentation NSD-5 10. Troubleshooting WinTesla General Set Up Following connection of the phone to the PC COM port and starting WinTesla, select Product from the main WinTesla menu and New from the drop-down menu. The ZIM configuration will automatically be selected. Select Configure from the main WinTesla menu and then choose Frequency Planning from the drop-down menu. You then will be able to set up the default CDMA Channels. The cable loss also should be entered.
NSD-5 10. Troubleshooting PAMS Technical Documentation selecting CDMA Tests from the drop-down menu. The “CDMA Testing” dialog box default switches on both the transmitter in Rho mode (Tx with CDMA modulation) and the receiver ON, with the channel defined as “Mid” in the “Frequency Planning” dialog box. PDMs may be adjusted on the “CDMA Testing” dialog box with the slider bars or by entering a value in the appropriate boxes. The transmitter is switched off by inserting a checkmark in the TX Off box.
PAMS Technical Documentation NSD-5 10. Troubleshooting ulation is switched off. The output carrier is monitored with a spectrum analyzer. Click on WinTesla Help for equipment set-up. The AFC PDM is tuned until the RF CW carrier frequency is within +/-250Hz of 2073.1MHz (i.e., Channel 300). Note: The Spectrum Analyzer must be connected to a high-stability, 10MHz reference at the rear of the instrument. If this is not done, then the tuning will not be accurate.
NSD-5 10. Troubleshooting PAMS Technical Documentation Adjustment of the AFC PDM from 0 to 511 should result in a voltage change on G501 Pin 1 of between 0.77 and 2.09 volts with approximately 45kHz change in the transmitter output frequency in the PCS band. Selecting the “PCS AFC Tuning On” box disables the CDMA modulation, allowing AFC tuning to be performed on the RF carrier feed through.
PAMS Technical Documentation NSD-5 10. Troubleshooting Test Points Test Point Signal Name General Characteristics General Signal Destination C507-R504 AFC VCTCXO control voltage PDM from MAD4 R530-R501 VR1 2.7V supply to VCTCXO CCONT to VCTCXO C519-C544 19.2MHz 19.2MHz from VCTCXO output VCTCXO output to CAFE and PLL IC’s C518 Tx VHFLO VHF LO to TIF CELL CDMA 346.2MHz LO from PLL to TIF IC C517 Rx VHFLO 256.2MHz VHF LO to RIF LO from PLL to RIF 19.
NSD-5 10. Troubleshooting PAMS Technical Documentation Trouble Case 2: Rx VHF LO Power < -12dBm Check the DC level of V506. DC level of Pin 1 > 1V, Pin 2 0.7 0.8V, Pin3 > 2V, between Pin 1 and Pin 2 from 0.6 to 0.8V If not, change V506. Trouble Case 3: UHF LO Power < -5dBm Check the DC level of V502. DC level of Pin 1 > 0.5V, between Pin 1 and Pin 2 from 0.6 to 0.8V If not, change V502. Trouble Case 3: Rx UHF LO Power < -5dBm Change G502.
NSD-5 10. Troubleshooting PAMS Technical Documentation S tart S et to "T u n in g A F C " M o de M e as u re A n te nn a P ort F req u en cy = 20 73 .1M H z + / - 25 0 H z No A dju st A F C V a lue No A dju st A F C V a lue Y es M e as ure "C L K 1 9M 2R F " fre qu en cy = 1 9.
NSD-5 10. Troubleshooting PAMS Technical Documentation A Measure TX VHF LO power at C518 > -20dBm Yes B No Measure DC level of V508 pin 1>1V pin2 >0.
NSD-5 10. Troubleshooting PAMS Technical Documentation B Measure RX VHF LO power at C517 > -12dBm Yes C No Measure DC level of V506 pin 1>1V pin2 >0.
NSD-5 10. Troubleshooting PAMS Technical Documentation C Remove C704 Measure RX UHF LO power at C524 > -5dBm Set to CH300 in CDMA Testing mode No Measure DC level of G502 pin 10>2 .7 V Measure RX UHF LO frequency at C524 =2088.
NSD-5 10. Troubleshooting PAMS Technical Documentation C R e m o ve L 6 1 9 M e a s u re T X U H F L O p o w e r a t C 510 > -5 d B m Yes S e t to C H 3 0 0 in C D M A T e s tin g M o d e No M e a s u re D C le ve l o f G 5 0 2 M e a s u re T X U H F L O fre q u e n c y a t C 5 1 0 p in 9 > 2 .7 V = 2 0 8 8 .
NSD-5 10. Troubleshooting PAMS Technical Documentation the 3-point calibration performed in this test. Then a second-order approximation is made and the offset and slope computed. TX_IF_AGC must be adjusted to achieve the correct power level for Point 1. When this is done, the process must be repeated for Points 2 and 3. Definition of Result The results of the three-point tuning are the 16 slope and offset values, which are stored to EEPROM RF_TUNE_PCS_TX_AGC_OFFSET_SLOPE_HANDLE.
PAMS Technical Documentation Issue 1 05/02 Nokia Corporation NSD-5 10.
NSD-5 10.
NSD-5 10. Troubleshooting PAMS Technical Documentation 1 Set Tx to Measure voltage at N606 pin2 and pin3 Yes >0.5V Replace Start Replace Start No Measure RF signal level at N606 output pin8 Yes >-20dBm No Measure voltage at V609 pin 1 Yes Measure voltage at V609 pin 3 No <0.6V Measure RF output signal level at V609 pin3 Yes Yes Replace <1.8V Replace <-10dBm No Start No Measure voltage at V606 pin 5 Yes Replace Start No Measure voltage at V603 pin 7 Yes <2.5V Replace <0.
NSD-5 10. Troubleshooting PAMS Technical Documentation 2 Measure the difference RF power level at N602 pin 2 and RF power level at N602 pin 4 Yes <12dB Replace V602 Start No Measure voltage at V604 pin3 Yes >4.7V END No Measure voltage at V604 pin 3 Yes <4.9V See baseband troubleshooting processor No Measure voltage at V603 pin 4 Yes <2.
PAMS Technical Documentation NSD-5 10. Troubleshooting EEPROM for each of these 16 segments. The offset for the segments is computed from the three-point calibration performed in this test. Then, a second-order approximation is made and the offset and slope computed. This tuning is done by putting signal level 1 into the receiver. The RX_IF_AGC will then automatically adjust for max CAFE input and the RX_IF_AGC is noted. This process is then repeated for signal levels 2 and 3.
NSD-5 10. Troubleshooting PAMS Technical Documentation 1900 PCS Tuning Rx IF Compensation Description of Test In this tuning, the receiver is calibrated at five different frequencies across the band. WinTesla instructs the signal generator to be set at five specific frequencies and a fixed amplitude. The RX_IF_AGC is adjusted by the phone’s software to make the best use of the CAFE ADC. The setting of RX_IF_AGC then is read from the phone at each of the five frequencies.
PAMS Technical Documentation NSD-5 10.
NSD-5 10.
PAMS Technical Documentation NSD-5 10. Troubleshooting RX Troubleshooting Troubleshooting Check components in the receiver chain from Duplexer Z727, LNA V701 and Mixer N701, the 128.1MHz CDMA IF SAW filter Z728 and RIF N730. Check that the RX_IF_AGC RIF Pin D2 changes as the receiver input signal level is adjusted. Check the Rx VHF LO RIF C517. See plot diagram (following) and the Synthesizer Block.
NSD-5 10. Troubleshooting PAMS Technical Documentation Rx VHF LO Measured at RIF Pin 20 with a Hi Z Probe RX Troubleshooting Flowchart Start Measure the RF signal power gain between V701 pin 1 and pin 3 No >-10dB Check the voltage at V701 Pin3 is>2.0V & Replace V701 Yes Measure the Freq. of N701 Pin6 128.
PAMS Technical Documentation NSD-5 10. Troubleshooting Signal Name General Characteristics General Signal Destination Tx VHF LO VHF LO to TIF PCS CDMA 436.2MHz LO from PLL to TIF IC Tx UHF LO UHF LO up converter IC LO from 2GHz VCO to up converter IC Rx VHF LO 256.
NSD-5 10.
