Iob Connections - Ricoh MP 7503SP Field Service Manual

7. Troubleshooting

IOB Connections

1. Reset the connections of the harnesses at CN270, CN281.
2. Cycle the machine off/on, and then see if the SC error recurs.
3. If the SC error does not recur > End.
4. If the SC error recurs, go to
IOB
1. Replace IOB.
2. Cycle the machine off/on, and then see if the SC code recurs.
3. If the SC error does not recur > End.
4. If the SC error recurs, go to
Harnesses
1. Check the condition of the harnesses between the fusing unit and AC control board and IOB
(broken wires, worn insulation can cause short circuits)
2. Replace the harnesses if you see any damage.
3. Make sure that the replacement harnesses are correct for the machine. For example, the harnesses
for the D223 are not the same as those for the D225.
4. After replacing the harnesses, cycle the machine off to see if the error recurs.
5. If the SC error does not recur > End.
1476
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