shooting
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.)
To Next Page
Loading...
