2-110 Service Manual
5060-4xx
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 Yes No
1 Make sure that the ITU light shield is not out of
position.
Is the ITU light shield out of position?
Properly align the
ITU light shield
Go to step 2
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?
Replace the “ITU
assembly” on
page 4-44
Go to step 3
3
Front cover assembly
Does the front cover close correctly?
Go to step 4 Install the front
cover correctly or
repair as
necessary
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?
Replace the
“Front cover
assembly” on
page 4-14
Go to step 5
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?
Go to step 6 Install the cable
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?
Replace the
“System board”
on page 4-72
Replace the
printhead
interlock cable/
switch assembly
(see “Printhead
interlock cable
assembly” on
page 7-22 for the
part number.)
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