TABLE OF CONTENTS
SECTION 8 − TROUBLESHOOTING 31..........................................................
8-1. Troubleshooting Flowchart 31.............................................................
8-2. Checking Unit Before Applying Power 32...................................................
8-3. Measuring/Discharging Input Capacitor Voltage Before Working On Unit 33.......................
8-4. Input Pre-Regulator Module (MOD1) 34.....................................................
8-5. Input Pre-Regulator Module (MOD1) Test Point Values 34.....................................
8-6. Inverter Module (MOD2) 35...............................................................
8-7. Inverter Module (MOD2) Test Point Values 35................................................
8-8. Power Interconnect Board PC2 36.........................................................
8-9. Power Interconnect Board PC2 Test Point Values 36..........................................
SECTION 8 − TROUBLESHOOTING (Continued) 31...............................................
8-10. Control Board PC1 37...................................................................
8-11. Control Board PC1 − Test Point Values 37...................................................
8-12. Power Switch (S1) 38....................................................................
8-13. Output Diodes D1, D2 39.................................................................
8-14. Output Diodes D1, D2 Test Point Values 39.................................................
8-15. Troubleshooting Table 40.................................................................
8-16. Help Displays 42........................................................................
8-17. Factory Reset Procedure 43..............................................................
8-18. Troubleshooting Circuit Diagram 44........................................................
8-19. Control Board PC1 Testing Information (Use with Section 8-20) 46..............................
8-20. Control Board PC1 Test Point Values 47....................................................
8-21. Control Board PC1 - Power Off Checks 50..................................................
8-22. Control Board PC1 − Power Off Checks 51..................................................
8-23. Power Interconnect Board PC2 Testing Information (Use with Section 8-24) 52....................
8-24. Power Interconnect Board PC2 Test Point Values 53..........................................
8-25. Power Interconnect Board (PC2) - Power Off Checks (Prior To MB510232A) 56...................
8-26. Power Interconnect Board (PC2) - Power Off Checks (Prior To MB510232A) 57...................
8-27. Power Interconnect Board (PC2) - Power Off Checks
(Effective With MB510232A Thru MH474076U) 58............................................
8-28. Power Interconnect Board (PC2) - Power Off Checks
(Effective With MB510232A Thru MH474076U) 59............................................
8-29. Power Interconnect Board (PC2) - Power Off Checks (Effective With MH474077U) 60..............
8-30. Power Interconnect Board (PC2) - Power Off Checks (Effective With MH474077U) 61..............
8-31. Front Panel/Display Board PC3 Testing Information (Use with Section 8-32) 62....................
8-32. Front Panel/Display Board PC3 Test Point Values 63..........................................
8-33. Checking Unit Output After Servicing 64....................................................
SECTION 9 − MAINTENANCE 65................................................................
9-1. Routine Maintenance 65.................................................................
9-2. Blowing Out Inside Of Unit 65.............................................................
9-3. Removing Fan Motor 66..................................................................
SECTION 10 − ELECTRICAL DIAGRAMS 67......................................................
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