3-1
Chapter 3
Maintenance
Contents Page
3-1. Introduction..................................................................... 3-3
3-2. PCA Access and General Maintenance .......................... 3-3
3-3. Display Access................................................................ 3-4
3-4. Cleaning.......................................................................... 3-4
3-5. Performance Test............................................................ 3-7
3-6. Initial Procedure ......................................................... 3-7
3-7. DC Voltage Test......................................................... 3-7
3-8. AC Voltage Test ............................................................. 3-8
3-9. Resistance Test........................................................... 3-8
3-10. Diode Test .................................................................. 3-9
3-11. DC mA Test................................................................ 3-10
3-12. DC Amps Test ............................................................ 3-11
3-13. Calibration.................................................................. 3-11
3-14. Troubleshooting.............................................................. 3-11
3-15. Supplemental Troubleshooting Procedures................ 3-13
3-16. Checking the Crystal Oscillator ............................. 3-13
3-17. Checking The Reference Voltage .......................... 3-13
3-18. Checking Display Drive Voltage ........................... 3-13
3-19. Checking Beeper Drive Signal............................... 3-13
3-20. Tracing the VDC Signal Path................................. 3-13
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