Dead Printer Service Check - Lexmark C540n Service Manual

5025-2xx, 4xx

Dead printer service check

A dead printer is one which, when powered on from a known good electrical outlet, displays no indication of
power to the printer by changes to the LCD, LED, or any movement of the fan or motors. If the printer appears
dead but makes a beeping sound, check the operator panel. See
on page 2-34.
If a 650-sheet Duo Drawer is installed, remove the option and check the base printer for correct operation. If the
base printer operates correctly, replace the 650-sheet Duo Drawer.
Warning: Observe all necessary ESD precautions when removing and handling the controller board or any
installed option cards or assemblies. See
CAUTION
When you see this symbol, there is a danger from hazardous voltage in the area of the product
where you are working. Unplug the product before you begin, or use caution if the product
must receive power in order to perform the task.
Remove any input paper-handling options from the printer.
Step Questions / actions
1 Check the AC powervoltagepower
Is the line voltage correct?
Is the AC power cord damaged?
2
3 Is the LVPS cable correctly connected at
JLVPS1 on the controller board?
4 Turn the printer off, and then on.
Does the problem persist?
5 Warning: Damage to the printer is possible.
Be careful to touch only one conductor at a
time. Rest the probe against the connector to
steady it.
With the printer on, verify the following values
at JLVPS1:
JLVPS1 (exposed conductors)
Pin Value
1 +5 V dc
3 +5 V dc
5 +5 V dc
7 +24 V dc
9 +24 V dc
11 +24 V dc
Are the values approximately correct?
2-24
Service Manual
voltage. Go to step 2.
Replace the line cord.
Go to step 5.
Go to step 5.
Replace the controller
board. See
board removal" on
page
Pin Value
2 Ground
4 Ground
6 Ground
8 Ground
10 Ground
12 Ground
16 Ground
"Operator panel display blank, five beeps"
"Handling ESD-sensitive parts" on page
Yes
"Controller
4-20.
4-1.
No
Inform the customer.
Go to step 3.
Reconnect the cable at
JLVPS1, and then go to
step 4.
Problem resolved.
Replace the LVPS. See
"Low-voltage power
supply (LVPS) assembly
removal" on page 4-47.