TAG 900: Top Cover Interlock Malfunction, Duplex

Error Code:

900

Possible Defects: Cover open sensor

PCL board

Duplex control board #1

Connectors or wiring

Complete TAG 600: AC Power Malfunction before starting this TAG.

1 Turn the printer off and unplug the power cord.

•Verify that J/P306, J/P307, J/P309, and J/P318 are connected properly.

•Confirm that the top and front covers are closing completely.

•Power-on-reset the printer.

Is error code 090 displayed?

No: Loose connectors or obstructions were at fault. Turn to TAG 002: Check & Problem Resolution .

Yes: Continue.

2 Open the printer’s top cover and insert the interlock by-pass tool.

•Turn on the printer.

•Check J/P309-3 on duplex control board #1 for +12 Vdc.

Is the voltage +12 Vdc?

No: Replace the duplex control board #1, then turn to TAG 002: Check & Problem Resolution .

Yes: Continue.

3 Check J/P309-1 on duplex control board #1 for +12 Vdc.

Is the voltage +12 Vdc?

No: Continue.

Yes: Go to #5 in this TAG.

4 Turn the printer off and unplug the power cord.

•Disconnect J/P318 and J/P309.

•Check the following for continuity: P309-1 to P318-2,

P309-3 to P318-1, and

P309-5 to P318-3.

Is there continuity?

No: Repair or replace the wiring or connectors from: P309-1 to P318-2,

P309-3 to P318-1, or

P309-5 to P318-3;

then turn to TAG 002: Check & Problem Resolution.

Yes: Replace the cover open sensor, then turn to TAG 002: Check & Problem Resolution.

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Troubleshooting Analysis Guide (TAGs)