Close Door/Hvps/Printhead Interlock Switch Service Check - Lexmark 13P0195 - C 750dn Color Laser Printer Service Manual

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Close door/HVPS/printhead interlock switch service check

Note: There are two separate cables that contain two microswitches and a cable. These cable/switches provide
separate interlocks for the printhead and HVPS. One switch in each cable is mounted in the front access door
support and the other switch in each cable is mounted on the ITU light shield assembly. The HVPS/cover open
cable is connected to J86 on the engine board and the printhead/cover open cable is connected to J12 on the
RIP board.
POR incomplete, Close Door constantly displays
This symptom is usually associated with the lower switch mounted on the front access door support and with the
left switch mounted in the ITU light shield.
Note: When the printer is powered on for some time with this symptom displayed, the printer may then display a
902 Service Error.
Step Action and questions
1 Make sure that the ITU light shield is not out of position.
Is the ITU light shield out of position?
2 Make sure the ITU assembly interlock switch actuator
is not damaged or broken and actuates the switches
correctly.
Is the actuator damaged or broken?
3 Front cover assembly
Does the front cover close correctly?
4 Front cover assembly
Make sure the front cover flag is not broken or
damaged and actuates the switches correctly.
Is the flag broken or damaged?
5 Printhead/cover open interlock cable assembly
Make sure the cable is correctly connected to J12 on
the RIP board.
Is the cable connected correctly?
6 Make sure the front cover is closed and the ITU is
correctly installed. Disconnect J12 from the RIP board
and check for continuity between pins J12-1 and J12-3.
Do you measure continuity?
2-118
Service Manual
Yes No
Properly align the Go to step 2
ITU light shield.
Replace the ITU Go to step 3
assembly. See
"ITU assembly
removal" on
page 4-37.
Go to step 4 Install the front
cover correctly or
repair as
necessary
Replace the front Go to step 5
cover assembly.
See "Front cover
assembly
removal" on
page 4-10.
Go to step 6 Install the cable
correctly.
Replace the RIP Replace the
board. See "RIP printhead interlock
board removal" cable/switch
on page 4-70. assembly.