Lexmark C734dn Service Manual

2-104 Service Manual
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920.12—POST (power-on self test)—One sensor not connected error service check
Step Questions / actions Yes No
1 Remove the left cover. See “Left cover
removal” on page 4-21. Check all the toner
level sensor cables connected to the rear of
the HVPS.
Are any of the cables damaged?
Replace the damaged
sensor. See “Toner level
sensor removal” on
page 4-160.
Go to step 2.
2
Disconnect the cable in the connector
JHVPS1 from the system board and the
HVPS.
Check for the following continuity.
Is continuity present?
Go to step 3. Replace the HVPS cable.
See “High-voltage power
supply (HVPS) cable
removal” on page 4-110
3
Reconnect the HVPS cable. Disconnect one
of the toner level sensors and POR the
printer.
Does the 920.12 error occur again?
Replace the toner level
sensor. See “Toner level
sensor removal” on
page 4-160.
Repeat the step for the
other toner level sensors.
After all the sensors are
tested without the 920.12
recurring, the problem is
resolved.
1
JSB1
JBIN1
JFAN1
JFUSER1
JBOR1
JHVPS1
JMIRR1
JBLW1
JCVR1
JLVPS2
JCARTP1
JCARTS1
JCARTS2
JCARTP2
JDVR1
JTPS1
JOPT1
JFDS1
JINT1
JFDPCK1JTRAY1JSEC1
JDX1
JT12
J5
JDIMM1
JOPP1
JT1
JUSB1
JBOOT1
JFMUSB1
J49
JTWF1
JTDBUG1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
JTLBT1
JPH1
F5
F6
F7
F9
F10
F12
F13
F14
1
1
J10
1
1
A

Lexmark C734dn Specifications

General

Brand	Lexmark
Model	C734dn
Category	Printer
Language	English