Lexmark C 746 Service Manual

Repair information4-205
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Photointerrupter sensor with cable assembly removal
1.Remove the high-capacity input tray (HCIT) right cover. See “HCIT right cover removal” on page 4-196.
2.Disconnect the photo interrupter sensor cable connector (A) from the HCIT controller board.
3.Turn the drawer rear side down, and use 4.0 mm wrench to remove the four Allen screws (B) securing the 
counterweight to the rear frame.
Warning:  Do not remove the screws without turning the drawer rear...

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4.Remove the screw (C) securing the sensor to the rear frame, and then release the hooks (D).
Note:  Remove the cable from the restraint, and observe the routing for reinstallation.
5.Remove the photo interrupter sensor with cable assembly.
Top plate assembly removal
1.Remove the high-capacity input tray (HCIT) right cover. See “HCIT right cover removal” on page 4-196. 
2.Disconnect the five connectors (A) from the HCIT controller board.
C D
A 

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3.Release the hooks (B) securing the pass thru sensor from the top plate assembly.
4.Remove the fourteen screws (C) securing the top plate assembly to the frame.
5.Remove the top plate assembly.
B
CC C 

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Connector locations5-1
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5.  Connector locations
Locations 

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Connectors
System board diagram
JSB1JBIN1
JFAN1JFUSER1
JBOR1JHVPS1
JMIRR1
JBLW1
JCVR1
JLVPS2
JCARTP1
JCARTS1
JCARTS2
JCARTP2
JDVR1
JTPS 19
JOX1
JFDS1
JINT1
JFDPCK1
JTRAY1JSEC1
JMPFPP1J7J19
JT 9JPH1JFMUSB1J2J2
F5
F7F8
F9
F10
F11
F14 

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System board listing 
See “System board diagram” on page 5-2.
Connector Description
F(#) Fuse
J2 Operator panel I/F
J5 Ethernet connector
JBIN1 Output bin sensor
JBLW1 Cartridge blower
JBOOT1 Daughter card boot connector
JBOR1 Black only retract connector
JBUSB1 USB device port
JCARTP1 Cartridge 1 BLDC motor (upper)
JCARTS1 Fuser and cartridge 1 connector
JCARTS2 Cartridge 2 BLDC motor (lower)
JCVR1 +25V Cover Open Switch Connector
JDVR1 Daughter card...

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Preventive maintenance6-1
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6.  Preventive maintenance
This chapter describes procedures for printer preventive maintenance. Follow these recommendations to help 
prevent problems and maintain optimum performance.
Safety inspection guide
The purpose of this inspection guide is to aid you in identifying unsafe conditions.
If any unsafe conditions exist, find out how serious the hazard could be and if you can continue before you 
correct the hazard.
Check the following items:...

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Cleaning the printhead lenses
Clean the printhead lenses when you encounter print quality problems.
1.Open the front access door.
Warning:  Potential Damage: To avoid overexposing the photoconductor units, do not leave the front door 
open for more than 10 minutes.
2.Remove all four toner cartridges. Do not remove the photoconductor units for this procedure.
3.Locate the four printhead lenses.
4.Clean the lenses using a can of compressed air.
Warning:...