Figure 5-13. Troubleshooting Flowchart: 8520C Power Light - Honeywell Chadwick-Helmuth 8500C Maintenance Manual

8520C POWER LIGHT NOT ON:
DISCONNECT J1
FROM CONTROLLER
BOARD A1
POWER LIGHT ON?
YES
RECONNECT A1 &
DISCONNECT QUAD
PEAK DET. BOARD
A3 FROM
CONTROLLER
BOARD A1
POWER LIGHT ON?
NO
REPLACE
CONTROLLER
BOARD A1 AND
RECONNECT A3
POWER LIGHT ON?
NO
RETURN 8520C TO
FACTORY FOR
REPAIR

Figure 5-13. Troubleshooting Flowchart: 8520C Power Light

NOTE: THIS FLOWCHART ASSUMES THAT THE FUSE AND
HARNESS ASSEMBLIES HAVE ALREADY BEEN CHECKED.
REPLACE P/S
NO
BOARD A2
REPLACE QUAD
YES
PEAK DET. BOARD
A3
YES
PROBLEM SOLVED
FILENAME: FLOWCHTB.DRW
8500C/8500C+ System Maintenance Manual 5-43
Troubleshooting Guide