Lexmark CS720 User Manual

Action Yes No
Step 5
• If the aected color is cyan, magenta, or yellow, then replace
the developer unit of the
aected
color.
• If the aected color is black, then replace the imaging unit.
Does the problem remain?
Go to step 6. The problem is
solved.
Step 6
a Remove the imaging kit.
b Enter the Diagnostics menu, and then navigate to:
Printer diagnostics & adjustments > Motor tests
c Select the developer unit motor of the
aected
color, and then
touch Start.
Does the motor run?
Go to step 8. Go to step 7.
Step 7
Replace the motor. See
“Motor (EP drive) removal” on page
296.
Does the problem remain?
Go to step 8. The problem is
solved.
Step 8
a Manually turn the motor.
b While turning the motor, check if the couplers that drive the
imaging kit move.
Do the couplers move?
Go to step 10. Go to step 9.
Step 9
Replace the EP gear box. See
“EP gear box removal” on
page 302.
Does the problem remain?
Go to step 10. The problem is
solved.
Step 10
Check if the pins on the HVPS freely move.
Do the pins freely move?
Go to step 12. Go to step 11.
Step 11
Replace the HVPS. See
“HVPS removal” on page 319.
Does the problem remain?
Go to step 12. The problem is
solved.
Step 12
Check the continuity of the cable on the JSC1 connector on the
controller board.
Does the cable have continuity?
Go to step 14. Go to step 13.
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Diagnostic information
38

Lexmark CS720 Specifications

General

Type	Original
Compatibility	- CS720
Product color	Black
Printing colors	Yellow
Country of origin	China
Quantity per pack	1 pc(s)
Brand compatibility	Lexmark
Color toner page yield	7000 pages
Cartridge return & recycling	Yes
Print technology	Laser printing
Harmonized System (HS) code	84439990

Weight and Dimensions

Package depth	160 mm
Package width	190 mm
Package height	75 mm
Package weight	380 g