Motorola Sse 5000 6881094c12 A Manual
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Chapter 8 Troubleshooting The purpose of this chapter is to aid in troubleshooting problems with the SSE 5000 radio. It is intended to be detailed enough to localize the malfunctioning circuit and isolate the defective component. 8.1 Voltage Measurement and Signal Tracing It is always a good idea to check the battery voltage under load. This can be done by checking the OPT_B+_VPP pin at the accessory connector (pin 8). The battery voltage should remain at or above 7.0 Vdc. If the battery voltage is less than 7.0 Vdc, then it should be recharged or replaced as necessary prior to analyzing the radio. In most instances, the problem circuit may be identified using a multimeter, an RF millivoltmeter, oscilloscope (preferably with 100 MHz bandwidth or more), and a spectrum analyzer. 8.2 Standard Bias Table Table 8-1 outlines some standard supply voltages and system clocks which should be present under normal operation. These should be checked as a first step to any troubleshooting procedure.When checking a transistor or module, either in or out of circuit, do not use an ohmmeter having more than 1.5 Vdc appearing across test leads or use an ohms scale of less than x100. Table 8-1. Standard Operating Bias Signal NameNominal ValueTo l e r a n c eVOCON Board Source 13 MHz 13 MHz ±1000 ppm C303 FLIP_32K 32.768 kHz ±400 ppm R337 CKIH 16.8 MHz R615 16_8MHz 16.8 MHz C607 POR 3.0 Vdc ±5% R725 RESET_OUT 3.0 Vdc ±5% D401, pin 1 VSW1 3.85 Vdc ±5% Test point TP501 VSW2 1.85 Vdc ±5% Test point TP500 FILT_B+ 7.5 Vdc 6.0-9.0 Vdc C523 V2 3.0 Vdc ±5% R560 GCAP_B+ 7.5 Vdc 6.0-9.0 Vdc R581 UNSW_B+ 7.5 Vdc 6.0-9.0 Vdc B702 SW_B+ 7.5 Vdc 6.0-9.0 Vdc R587 VCC5 5.0 Vdc ±5% R503 ! C a u t i o n
November 11, 20046881094C12-A 8-2Troubleshooting: Power-Up Error Codes 8.3 Power-Up Error Codes When the radio is turned on (power-up), the radio performs self-tests to determine if its basic electronics and software are in working order. When you turn the radio on normally, the radio performs a limited self-test. This allows the radio to achieve full power within two seconds. To allow the radio to perform a full self-test (which extends the time required to achieve full power), press and hold the top side button while turning the radio on. If the self-test is successful, you hear a chirp. If the self-test is unsuccessful, you hear a single, low-frequency tone and see an error code on the radio’s display. The radio should be sent to the depot if cycling power and reprogramming the code plug do not solve the problem. The presence of an error should prompt the user that a problem exists and that a service technician may need to be contacted. Self-test errors are classified as either fatal or non-fatal. Fatal errors will inhibit user operation; non- fatal errors will not. Use Table 8-2 to aid in understanding particular power-up error code displays. Table 8-2. Power-Up Error Code Displays Error CodeDescriptionError TypeCorrective Action 01/02 FLASH ROM Codeplug Checksum Error Non-Fatal 1. Turn radio off, then on 2. Reprogram the radio codeplug 01/12 Security Partition Checksum Error Non-Fatal Reprogram the security codeplug 01/20 ABACUS Tune Failure Non-Fatal Turn radio off, then on 01/22 Tuning Codeplug Checksum Error Non-Fatal Reprogram the tuning codeplug, then retune the radio 01/82 FLASH ROM Codeplug Checksum Error Fatal Reprogram the radio codeplug 01/88 External RAM failure — Note: Not a checksum failureFatal 1. Turn radio off, then on 2. Reprogram the radio codeplug 01/90 General Hardware Failure Fatal Turn radio off, then on 01/92 Security Partition Checksum Error Fatal Reprogram the security codeplug 01/A0 ABACUS IC failure Fatal Turn radio off, then on 01/A2 Tuning Codeplug Checksum Error Fatal Reprogram the tuning codeplug, then retune the radio 02/88 DSP RAM failure — Note: Not a checksum failure Fatal Turn radio off, then on 02/90 General DSP Hardware Failure (DSP startup message not received correctly)Fatal Turn radio off, then on 09/10 Secure Hardware Error Non-Fatal Turn the radio off, then on. 09/90 Secure Hardware Fatal Error Fatal Turn the radio off, then on. Note: If more than one corrective action is listed, try the first one to see if it fixes the problem before trying the second one. If none of the actions listed fixes the problem, or if your radio displays an error code other than those shown above, send the radio to the depot.
6881094C12-ANovember 11, 2004 Troubleshooting: Operational Error Codes8-3 8.4 Operational Error Codes During radio operation, the radio performs dynamic tests to determine if the radio is working properly. Problems detected during these tests are presented as error codes on the radio’s display. The presence of an error code should prompt a user that a problem exists and that a service technician should be contacted. Use Table 8-3 to aid in understanding particular operational error codes. 8.5 Receiver Troubleshooting Table 8-4 lists the possible causes of, and corrections for, receiver problems.Table 8-3. Operational Error Code Displays Error CodeDescriptionCorrective Action FAIL 001 Synthesizer Out-of-Lock 1. Reprogram external codeplug 2. If 1 does not work, then send radio to depot FAIL 002Selected Mode/Zone Codeplug Checksum ErrorReprogram external codeplug Table 8-4. Receiver Troubleshooting Chart SymptomPossible CauseCorrection or Test (Measurements at Room Temperature) Radio Dead; Display Does Not Turn On1. Dead Battery Replace with charged battery 2. Blown Fuse Send radio to depot 3. On/Off Switch 4. Regulators Radio Dead; Display Turns On1. VOCON Board Send radio to depot 2. RF Board No Receive Audio, or Receiver Does Not UnmuteProgramming 1. Does the transmitted signal match the receiver configuration (PL, etc.)? 2. With the monitor function enabled, can the radio be unmuted? Audio Distorted or Not Loud EnoughSynthesizer Not On FrequencyCheck synthesizer frequency by measuring the transmitter frequency; realign if off by more than ±1000 Hz RF Sensitivity Poor 1. Synthesizer Not On FrequencyCheck synthesizer frequency by measuring the transmitter frequency; realign if off by more than ±1000 Hz 2. Antenna Switch/ ConnectorSend radio to depot Radio Will Not Turn Off VOCON Board Send radio to depot
November 11, 20046881094C12-A 8-4Troubleshooting: Transmitter Troubleshooting 8.6 Transmitter Troubleshooting Table 8-5 lists the possible causes of, and corrections for, transmitter problems. 8.7 Encryption Troubleshooting Table 8-6 lists the possible causes of, and corrections for, encryption problems. Table 8-5. Transmitter Troubleshooting Chart SymptomPossible CauseCorrection or Test (Measurements Taken at Room Temperature) No RF Power Out 1. TX Power Level or Frequency Check TX power level and frequency programming (from tuner) 2. No Injection To Power AmplifierSend radio to depot 3. Antenna Switch/Connector No Modulation; Distorted Modulation1. Programming Check deviation and compensation settings using the tuner 2. VOCON Board Send radio to depot Bad Microphone Sensitivity 1. Check Deviation and CompensationRealign if necessary 2. Microphone Send radio to depot No/Low signaling (PL, DPL, MDC)1. Programming Check programming 2. VOCON Board Send radio to depot Cannot Set Deviation BalanceRF Board Send radio to depot Table 8-6. Encryption Troubleshooting Chart SymptomPossible CauseCorrective Action No “KEYLOAD” on Radio Display When Keyloading Cable is Attached to the Radio Side Connector1. Defective Keyload Cable Send radio to depot 2. Defective Radio Keyloader Displays “ KEY LOAD FAILURE!” 1. Wrong Keyloader Type Use correct keyloader type. Refer to Keyloader User Guide for more information 2. Bad Keyloader Try another keyloader 3. Defective Radio Send radio to depot
Chapter 9 Troubleshooting Charts This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio. 9.1 List of Troubleshooting Charts Most troubleshooting charts (see Table 9-1) end up by pointing to an IC to replace. It is not always noted, but it is good practice to verify supplies and grounds to the affected IC and to trace continuity to the malfunctioning signal and related circuitry before replacing any IC. For instance, if a clock signal is not available at a destination, continuity from the source IC should be checked before replacing the source IC. Table 9-1. Troubleshooting Charts List Chart TitlePage Number Main Troubleshooting Flowchart 9-2 Power-Up Failure 9-3 DC Supply Failure 9-5 Display Failure 9-8 Volume Set Error 9-11 Channel Select Error 9-12 Button Test 9-13 Top/Side Button Test 9-14 VCO TX/RX Unlock 9-15 VOCON TX Audio 9-16 VOCON RX Audio 9-18 RX RF9-20 TX RF 9-25 Keyload Failure 9-28 Secure Hardware Failure 9-29
November 11, 20046881094C12-A 9-2Troubleshooting Charts: Main Troubleshooting Flowchart 9.2 Main Troubleshooting Flowchart MAEPF-27403-A Start Is TX Deviation OK? Go to TX RF flowchart Go to VOCON RX Audio flowchartReceive Audio? Good SINAD? Buttons Functional? EndGo to either Display Failure or Power-Up Failure flowchart See Button Test flowchartError Messages on RSS? Ye s Ye s Ye sYe s Ye s Ye s Ye s Ye s Ye sNo No No No No NoNo No No Good power-up Self-Test?Error Message?Display Model? See Table 5-2: Power-up Self- Check Error Codes Is there TX Power? Go to TX RF flowchartUse RSS to display Error Messages
6881094C12-ANovember 11, 2004 Troubleshooting Charts: Power-Up Failure9-3 9.3 Power-Up Failure—Page 1 MAEPF-27389-D Radio Power-Up Failure Probe 32.768 kHz Clock at R316 Signal Present? Signal may appear for a very short period of time (50 ms). Use an oscilloscope with trigger to capture signal. Verify integrity of C308 and C309 Verify Standard Bias in Table 5-1 Standard Bias OK? Isolate and Repair Problem See DC Supply Failure flowchart No No Ye s Ye s 12
November 11, 20046881094C12-A 9-4Troubleshooting Charts: Power-Up Failure Power-Up Failure—Page 2 Investigate Clock Buffer Components and Isolate ProblemThis signal may contain harmonics and, therefore, may not appear as a perfect sinewave. Signal may appear for a very short period of time (50ms). Use an oscilloscope with trigger to capture signal. Refer Board to Service Depot for Reflash, Patriot, SRAM, and FLASH AnalysisInvestigate 16.8 MHz Reference Oscillator Probe 16.8 MHz Signal at R615 Signal greater than 600mV? Signal greater than 600mV?Check 16.8 MHz Signal at C607 Replace U301 Replace Problem Component Components OK? Fixed?End Fixed? Replace Y301 No No NoNo No Ye s Ye sYe s Ye sYe s 1 2 Note: All components noted on this chart are VOCON components.
6881094C12-ANovember 11, 2004 Troubleshooting Charts: DC Supply Failure9-5 9.4 DC Supply Failure—Page 1 NOTE:Since the failure of a critical voltage supply might cause the radio to automatically power down, supply voltages should first be probed with a multimeter. If all the board voltages are absent, then the voltage test point should be retested using a rising-edge-triggered oscilloscope. If the voltage is still absent, then another voltage should be tested using the oscilloscope. If that voltage is present, then the original voltage supply in question is defective and requires investigation of associated circuitry. MAEPF-27391-A Check Voltage at pin 3 of Q502 Replace Q501Check Voltage at pin 2 of Q502 Voltage = 0V?Replace Q502 Check Continuity of Fuse F901 on transceiver Voltage = B+? Voltage = B+?Voltage = B+?Replace Fuse Replace Front Cover Housing Assembly Fixed? End Fuse OK? Check Voltage at pin 1 of Q501Check Battery Connections for Good Contact Problem with DC Distribution Network Check Voltage at pin 5 of Q501 (VOCON) No No No No No No Ye s Ye s Ye s Ye sYe s 1Ye s
November 11, 20046881094C12-A 9-6Troubleshooting Charts: DC Supply Failure DC Supply Failure—Page 2 MAEPF-27392-C Check R501, D502, L501, and C504 Check Voltage at R560Replace Problem Component Voltage = V2?*Replace U501 (GCAP II) Check R502, C506, L502, and D503 Voltage = 3.77V+/-5%? Voltage = 1.85V+/-5%?Components OK?ReFLASH HOST C Code Fixed? End Components OK? Check Voltage at R501Replace Problem Component Check Voltage at B502 (VOCON) No Ye sYe s Ye s Ye s Ye sYe s NoNo No No 1 2 32 No * per Standard Bias Table