shooting
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.
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