Lexmark C520 Series Service Manual page 85

Step Questions / actions
4 Reconnect JINT1 if disconnected. Ensure
front access door is completely closed.
Check for 5VDC between JINT1 pin 3 (white
wire) and ground. Is voltage present?
5 Replace printhead. Go to
removal" on page
112.xx—Printhead error service check
Step Questions / actions
1 Turn the printer off and remove the rear
cover. Check connector JINT1 (5V interlock
switch cable) for proper connection to
system card, cable for pinch points and cable
or connector for any other damage. Is cable
properly connected and damage free?
2 Check connector JPH1 (large printhead
cable) for proper connection to system card,
cable for pinch points and cable or connector
for any other damage. Is cable properly
connected and damage free?
3 Turn printer power on and check for 5VDC
between JINT1 pin 1 (red wire) and ground.
Is voltage present?
Note: Ground lead of voltmeter can be
placed on metal chasis to obtain ground.
4 Reconnect JINT1 if disconnected. Ensure
front access door is completely closed.
Check for 5VDC between JINT1 pin 3 (white
wire) and ground. Is voltage present?
5 Replace printhead. Go to
removal" on page
"Printhead
4-52. Does error clear?
"Printhead
4-52. Does error clear?
Yes
Go to step 5.
Problem solved.
Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Problem solved.
5022-xxx
No
Replace 5V interlock
switch.Go to "Front access
door 5V interlock switch
removal" on page 4-43.
Replace system card. Go to
"System card removal" on
page 4-47.
No
If connector is damaged on
system card, replace
system card. Go to
"System card removal" on
page 4-47. If JINT1 cable or
connector is damaged,
replace 5V interlock
switch.Go to "Front access
door 5V interlock switch
removal" on page 4-43.
If connector is damaged on
system card, replace
system card. Go to
"System card removal" on
page 4-47. If printhead
cable is damaged, replace
printhead.Go to "Printhead
removal" on page 4-52.
Disconnect JINT1 and
check for 5VDC between pin
1 of system card connector
and ground. If voltage is
present, replace 5V
interlock switch.Go to
"Front access door 5V
interlock switch removal"
on page 4-43. If voltage is
not present, replace system
card. Go to "System card
removal" on page 4-47.
Replace 5V interlock
switch.Go to "Front access
door 5V interlock switch
removal" on page 4-43.
Replace system card. Go to
"System card removal" on
page 4-47.
2-27
Diagnostic information