Lexmark C77x Service Manual page 124

5061
Step Actions and questions
7 Check the voltages on the bottom options cable
connector. The voltages are with the printer in standby
mode.
Note: All voltages are approximate values.
Connector pin Voltage
J20-1
J20-2
J20-3
J20-4
J20-5
J20-7
J20-8
Are the voltages correct?
8
Make sure the upper options cable in the duplex option
is installed correctly in the duplex frame.
Is the cable installed correctly?
9 Make sure the upper options cable in the duplex option
is connected correctly to J11 on the duplex options
board.
Is the cable connected correctly?
10 Check continuity of the upper duplex options cable.
Is there continuity?
Top margin on duplexed copy set incorrectly
Go to "Duplex Quick Test" on page 3-19
2-82
Service Manual
+5 V dc
Ground
Ground
+5 V dc
+24 V dc
+5 V dc
+5 V dc
to adjust the top margin on the back of the duplexed page.
Yes No
Go to step 8 Replace the
bottom options
cable in the
printer.
Go to step 9 Correctly install
the cable. If the
connector is
damaged,
replace the cable
assembly.
Go to step 10 Install the cable
correctly.
Replace the Install the cable
duplex options correctly.
board.