Close Door/Hvps/Printhead Interlock Switch Service Check - Lexmark C752 Service Manual

Close door/HVPS/printhead interlock switch service check

Note: There are two separate cables that contain microswitches and a cable. These cable/switches provide
separate interlocks for the printhead and HVPS. One switch in the Printhead/cover open cable is mounted in the
front access door support and the other switch in the printhead/open cover cable is mounted on the ITU light
shield assembly. The HVPS/cover open cable only has one switch mounted on the front access door support
and is routed through the ITU autoconnect. The HVPS/cover open cable is connected to J28 on the system
board and the printhead/cover open cable is connected to J10 on the system 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
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?
Front cover assembly
4
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 that the cable is correctly connected to J10
on the system board.
Is the cable connected correctly?
6 Make sure the front cover is closed and the ITU is
correctly installed. Disconnect J10 from the system
board and check for continuity between pins J10-1 and
J10-3.
Do you measure continuity?
Yes No
Properly align the Go to step 2
ITU light shield
Replace the "ITU Go to step 3
assembly" on
page 4-40
Go to step 4 Install the front
cover correctly or
repair as
necessary
Replace the Go to step 5
"Front cover
assembly" on
page 4-12
Go to step 6 Install the cable
correctly
Replace the Replace the
"System board" printhead
on page 4-67 interlock cable/
switch assembly
(see
interlock cable
assembly" on
page 7-22
part number.)
Diagnostic information
5060-2XX
"Printhead
for the
2-109