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Appendix A. Power Supply Adjustment and
Troubleshooting
Introduction ..............................................................................................A-1
In this Appendix .......................................................................................A-1
Adjusting the AC Power Supply Brownout Potentiometer ..........................A-2
Overview ..................................................................................................A-2
Using a Variac to Adjust the Brownout Potentiometer ............................A-2
Checking AC Power Supply Transformer / Bridge Rectifier .......................A-3
Checking DC Voltage at H1 and H2 ........................................................A-3
Checking Connectors................................................................................A-3
Replacing the Line Voltage Transformer and Bridge Rectifier................A-5
Checking EPS Transformer / Bridge Rectifier .............................................A-6
Introduction ..............................................................................................A-6
Checking DC Voltage from EPS Bridge Rectifer ....................................A-6
Checking Connectors................................................................................A-7
Replacing the EPS Line Voltage Transformer and Bridge Rectifier ........A-8
Appendix B. Diagnostic Utilities, Basic Service
Procedures, and Known Solutions
Introduction ..............................................................................................B-1
In this Appendix .......................................................................................B-1
N2 Comm Diagnostics .................................................................................B-2
Procedure..................................................................................................B-2
SLCnet Diagnostics......................................................................................B-3
Procedure..................................................................................................B-3
Duplicate Devices.....................................................................................B-3
Weak Answer Devices..............................................................................B-3
SLCnet Earth Fault Search Diagnostics .......................................................B-4
Procedure..................................................................................................B-4
WALKtest ....................................................................................................B-5
Overview ..................................................................................................B-5
Using WALKtest......................................................................................B-5
Important Notes........................................................................................B-5
SIMtest .........................................................................................................B-6
Overview ..................................................................................................B-6
Using SIMtest...........................................................................................B-7
Basic Service Procedures .............................................................................B-8
Restoring the Z-28’s Default Programming .............................................B-8
Determining the BIN File Software Revision...........................................B-8
Disabling the Piezo on a Remote LCD Annunciator................................B-8
Clearing an Event Overflow Trouble .......................................................B-8
Index