Lexmark C750 Service Manual page 163

Step Action and questions
4 Disconnect J5 from the engine board and check the
voltages on connector J5 on the engine board.
The voltages measure as follows:
Note: All voltages are approximate values.
Connector pin Voltage
J5-1 +24 V dc
J5-3 +5 V dc
J5-5 +5 V dc
J5-6 +5 V dc
J5-8 +5 V dc
Are the voltages correct?
5 Autoconnect cables—check the autoconnect from the
printer or option above the HCIT 2000-sheet option.
Check for any signs of cuts, pinched wiring or damage
to the contacts in the connector.
Are there any problems with the autoconnect cables?
6 HCIT autoconnect cable—check the HCIT autoconnect
cable for correct installation at the HCIT system board.
Is the cable installed correctly?
7 HCIT autoconnect cable continuity—check the
continuity of the HCIT autoconnect cable(s).
Is there continuity?
Yes No
Go to step 5 Replace the engine
board
Repair or replace Go to step 6
as necessary
Go to step 7 Install the cable
correctly
Replace HCIT Replace the HCIT
system board autoconnect cable
Diagnostic information
5060-00x
2-129