Motorola ASTRO Digital Saber Service Manual page 83

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
section prior to troubleshooting a radio.
Most troubleshooting charts end up by pointing to an IC to replace. It is not always noted, but 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 IC, continuity from the source IC should be checked before
replacing the source IC.
Description
Chart 1. 800MHz Radio Main Troubleshooting Chart................................................. 10-2
Chart 2. VHF/UHF Radio Main Troubleshooting Chart............................................... 10-2
Chart 3. Radio Power-Up Fail ....................................................................................... 10-3
Chart 4. Bootstrap Fail .................................................................................................. 10-4
Chart 5. DC Supply Failure ........................................................................................... 10-5
Chart 6. 01/81 Host ROM Checksum Failure ............................................................... 10-5
Chart 7. 01/82 or 002, External EEPROM Checksum Failure....................................... 10-6
Chart 8. 01/84 SLIC Initialization Failure .................................................................... 10-6
Chart 9. 01/88 MCU (Host µC) External SRAM Failure ............................................... 10-7
Chart 10. 01/92, Internal EEPROM Checksum Failure................................................... 10-7
Chart 11. 02/A0, ADSIC Checksum Faiure ..................................................................... 10-8
Chart 12. 02/81, DSP ROM Checksum Failure ............................................................... 10-8
Chart 13. 02/88, DSP External SRAM Failure U414........................................................ 10-9
Chart 14. 02/84, DSP External SRAM Failure U403........................................................ 10-9
Chart 15. 02/82, DSP External SRAM Failure U402...................................................... 10-10
Chart 16. 02/90, General DSP Hardware Failure .......................................................... 10-10
Chart 17. 09/10, Secure Hardware Failure .................................................................... 10-11
Chart 18. 09/90, Secure Hardware Failure .................................................................... 10-11
Chart 19. Key Load Fail................................................................................................. 10-12
Chart 20. Button Test.................................................................................................... 10-12
Chart 21. Keypad Error ................................................................................................. 10-13
Chart 22. Volume Set Error........................................................................................... 10-13
Chart 23. Zone/Channel Select Error ........................................................................... 10-14
Chart 24. Top/Side Button Error................................................................................... 10-14
Chart 25. No Display .................................................................................................... 10-15
Chart 26. No TX Modulation ....................................................................................... 10-16
Chart 27. 800MHz No TX Deviation ............................................................................ 10-17
Chart 28. VHF/UHF No TX Deviation .......................................................................... 10-17
Chart 29. No RX Audio ................................................................................................. 10-18
Chart 30. VHF/UHF/800MHz Receiver RF .................................................................... 10-19
Chart 31. VHF/UHF Frequency Generation Unit (FGU) .............................................. 10-19
Chart 32. 800MHz Frequency Generation Unit (FGU) ................................................ 10-20
Chart 33. VHF/UHF Voltage Controlled Oscillator (VCO)........................................... 10-21
Chart 34. 800MHz Voltage Controlled Oscillator (VCO)............................................. 10-22
Chart 35. 800MHz DC Switch ...................................................................................... 10-22
Chart 36. VHF/UHF DC Switch .................................................................................... 10-23
Chart 37. 800MHz Transmitter RF................................................................................ 10-24
Chart 38. VHF/UHF Transmitter RF.............................................................................. 10-25
Chart 39. VHF/UHF Only, VCO Crossover Frequency Tune........................................ 10-26
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