Lexmark C734 Service Manual page 98

5026
Step Questions / actions
5 Remove the rear frame cover. See
frame cover removal" on page
Check the fuser DC cable in the connector
JFUSER1 for proper connection to the system
board, for pinch points, and for any other
damage to the cable or the connector.
Is the cable damaged?
6 1. POR the printer.
2. Place a voltmeter between pin 8 and pin 6
(ground) on the JFUSER1 connector on
the system board.
1
JSB1
1
JCVR1
F5
JLVPS2
1
3. Does the meter read +5 V dc?
7 Place a voltmeter between the fuser
autoconnect pin 8 and ground (6).
Does the meter read +5 V dc?
2-64
Service Manual
"Rear
4-33.
A
1 JBIN1 1 1 JFUSER1 1 JHVPS1 1 JBLW1
JSB1 1 JFAN1 JBOR1 1 JMIRR1 1
1
JCVR1
F5
F6
JLVPS2
1
JCARTP1 F7
1 J49
JCARTS1
1
JBOOT1
JDIMM1
F9
JCARTS2
1
JTLBT1
JCARTP2 1 1
1
1 JTWF1
F10
JDVR1 JTDBUG1
1 1
JTPS1
1
JOPT1 J5
1 JDX1 1
1 F13
1 JFDS1
F12
JINT1 F14
1
JFDPCK1 JTRAY1 JSEC1 JPH1
1 1 JT12
1 JFUSER1 1
JHVPS1
1
JBIN1
1
1
JFAN1 JBOR1
F6
Pin 6 Pin 8
(ground)
Yes
Replace the fuser DC
cable. See "Fuser DC
cable removal" on
page 4-92.
1
JOPP1
JT1
1
JUSB1
1
J10
JFMUSB1
Go to step 7.
J
Go to step 8.
No
Go to step 6.
Replace the system board.
See "System board
removal" on page 4-139.
Replace the fuser DC
cable. See "Fuser DC
cable removal" on
page 4-92.