Lexmark 13P0150 - C 750dtn Color Laser Printer, Service Manual

Page: 89 / 262

Diagnostic Information
2-69
5060-XXX
Step B
Light print over the entire page
If all colors have light print, replace the “HVPS Developer Board” on page 4-36 .
If only one color has light print, go to step 1.
3
High Voltage Contact Block Assembly Check, PC Drum
Contact Pin - Check for a stuck PC Drum Contact in the HV
contact block assembly. Refer to figure 1 for the location of
the PC Drum Contact Pin.
Is the pin stuck or does not operate smoothly? Repair the HV
Contact Block
Assembly. Go to Step 4
4
High Voltage Contact Block Assembly Check, Continuity
Check for continuity from the PC Drum Contact Pin to the
PC Drum Developer Pin Spring.
Is there continuity? Go to Step 5 Repair the HV
Contact Block
Assembly.
5
High Voltage Contact Block Assembly Check, PC Drum
Developer Pin Spring - Check the PC Drum Developer Pin
Spring to make sure it is not bent or damaged.
Is the spring bent or damaged? Replace the
PC Drum
Developer Pin
Spring. Replace the
“HVPS
Developer
Board” on
page 4-36
Step Action and Questions Yes No
1
Retraction Motor Check - Generally this symptom is caused
by a retracted ITU assembly. Check to see if the ITU
retraction motor keeps the ITU in the retracted position.
Does the motor keep the ITU in the retracted position? Replace the
Retraction
Motor. If this
does not
correct the
problem,
replace the
“Engine
Board” on
page 4-13
.
Replace the
“HVPS
Developer
Board” on
page 4-36
Step Action and Questions Yes No
1
Toner Cartridge Check - The toner may be out, the toner
cartridge seated improperly or the shutter has been left on
the bottom of the cartridge.
Is the toner cartridge seated properly and the shutter
removed? Go to Step 2 Install the
cartridge
correctly or
remove the
packing
material from
the cartridge.
Step Action and Questions Yes No