Close Door/Hvps/Printhead Interlock Switch Service Check - Lexmark C77x 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 J14 on the system
board, and the printhead/cover open cable is connected to JCVR1 on the system board.
POR incomplete,
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.
Step Actions 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 assembly 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 and
+24 V cover switch.
Make sure that the cable is correctly connected to
JCVR1 and J14 on the system board.
Are the cables connected correctly?
6 Make sure the front cover assembly is closed and the
ITU is correctly installed. Disconnect JCVR1 from the
system board, and check for continuity between pins
JCVR1-1 and JCVR1-3.
Do you measure continuity?
7 Disconnect J14 from the system board and check for
continuity between pins J14-1 and J14-2.
Do you measure continuity?
constantly displays
Close Door
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 4-49.
Go to step 4 Install the front
cover correctly,
or repair as
necessary
Replace the front Go to step 5
cover. See
"Front cover or
front cover
backplate
assembly
removal" on
page 4-11.
Go to step 6 Install the cable
correctly.
Go to step 7 Replace the
printhead
interlock cable/
switch assembly
(see
interlock cable
assembly" on
page 7-37
part number.)
Replace the Replace the ITU
system board. light shield
See "System assembly. See
board removal" "ITU light shield
on page 4-89. assembly" on
page
Diagnostic information
5061
"Printhead
for the
7-37.
2-79