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Covers procedures for replacing electronic modules and their components.
Details the purpose of the document and expanded coverage areas.
Explains the MPU self-test and diagnostic tests for modules.
Details the use of the AID1 module for testing circuit continuity.
Provides general servicing guidelines and safety precautions.
Outlines the steps for diagnosing and correcting faults.
Introduces the procedures for component replacement.
Emphasizes visual inspection and standard servicing tools.
Details the MPU self-test process and its indications.
Offers tips for testing the MPU module and interpreting results.
Troubleshooting bus failures related to the PIA U11 test.
Troubleshooting bus failures related to the PIA U10 test.
Troubleshooting display interrupt circuit faults.
Troubleshooting zero crossing circuit faults.
Covers testing the Lamp Driver module using the self-test routine.
Troubleshooting procedures for lamps that are always off.
Troubleshooting procedures for lamps that are always on.
Covers diagnosing and fixing display issues like mottling or dimness.
Troubleshooting procedures for segments that are always on or off.
Diagnosing issues with improper display counts or digits.
Addresses issues with the +5VDC and +190VDC regulator circuits.
Troubleshooting common faults in the +5 VDC regulator circuit.
Troubleshooting common faults in the +190 VDC regulator circuit.
Diagnosing why solenoids are not activating.
Troubleshooting solenoids that remain energized.
Troubleshooting output voltages that are out of limits.
Diagnosing why the module causes fuses to blow.
Identifies the six functional circuit areas within the sound module.
Provides a simplified test sequence for fault localization.
Troubleshooting issues related to the sound module's power supply.
Diagnosing problems with the frequency generation circuit.
Troubleshooting incorrect tone sequences due to frequency division issues.
Diagnosing problems with the audio amplification circuit.
Addresses problems with sustain adjustment and envelope generator function.
Using AID1 to trace tone data bus signals.
Checking tone memory operation using jumper leads and a voltmeter.
Lists kits for component replacement on different modules.
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General