FRU Action
Controller board assembly
Verify +24 V dc and +5V dc input from the engine board.
1. Turn the machine off.
2. Disconnect the controller board power cable from the engine
board at J503.
3.
Turn the machine on.
4. Verify +24Vdc on positions 17, and 19 of the cable connector
(J503).
5. Verify +5 V dc on positions 11, 13, 15 on J503.
6. If voltages are correct on the engine board, then check the
continuity in the other conductors of the cable. If the cable is
good, then turn the machine off, and check the connectors on
the controller board. If the cable isn’t good, replace the
controller board cable.
7. Verify that pins 10, 12, 14, 16, and 18 on both the cable and
the engine board connector are grounded.
8. If grounds are not correct on the cable, but the cable passes
continuity otherwise, then check the controller board.
9. If the grounds are not correct on the controller board, then
replace the controller board. (Check with one probe on the
connector pin and the other on the card’s ground plane found
at each screw head.)
Service Checks
235
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