FRU Action
Verify +24 V dc input from the LVPS/HVPS.
1. Turn the machine off.
2. Disconnect the LVPS/HVPS cable from the engine board at
J502.
3.
Turn the machine on.
4. Verify +24Vdc on positions 6, 17, and 19 of the cable
connector (LVPS/HVPS).
5. If voltage is correct, 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 to the controller board.
6. Verify that pins 10, 12, 14, 16, and 18 on both the cable and
the card connector are grounded.
7. If grounds are not correct on the cable, but the cable passes
continuity otherwise, then check the LVPS/HVPS.
8. If the grounds are not correct on the engine board, then
replace the engine board. (Check with one probe on the
connector pin and the other on the card’s ground plane found
at each screw head.)
Engine board assembly
Engine board voltage outputs
Turn the machine off, and plug the LVPS/HVPS cable into J502 of
the engine board. See the wiring diagram which identifies the
output voltages and grounds for a good engine board.
Turn the machine off before plugging or unplugging any
connectors.
Service Checks
237
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