Lexmark C 540n, Service Manual

Page: 63 / 262

Diagnostic information
2-29
5025-2xx, 4xx
Input (S2) sensor service check
Note: The input (S2) sensor is part of the paper pick motor drive assembly FRU, and is not available otherwise.
5 Check the following values at JFUSES1:
Are the values approximately correct?
Go to step 6. Replace the controller
board. See
“Controller
board removal” on
page 4-20
.
6 Replace the fuser. See “Fuser assembly
removal” on page 4-29 .
Does the error clear?
Problem resolved. Replace the controller
board. See
“Controller
board removal” on
page 4-20
.
Step Questions / actions Yes No
1 Enter Diagnostics Menu (turn the printer off,
press and hold
and , turn the printer on,
and then release the buttons when the
installed memory and processor speed
displays).
Perform the Base Sensor Test. See “Base
Sensor Test” on page 3-16 .
1. Select Base Sensor Test , and press
Select ( ).
2. Select S2 , and press Select ( ).
3. Pull tray 1 out, and rotate the S2 sensor
flag (S2 is located in front of the center
paper pick motor drive assembly housing.)
It should rotate freely and return to its
original position.
Is the input (S2) sensor flag damaged?
Replace the paper pick
motor drive assembly. See
“Paper pick motor drive
assembly removal—
standard tray” on
page 4-61
.
Go to step 2.
2 Watch the display while rotating the flag.
Does the display indicate
Media Clear
and
Media Present
?
Problem resolved. Go to step 3.
3 Turn the printer off, and remove the rear
shield. See
“Top cover assembly removal”
on page 4-13 .
Is the JSP1 cable connector properly
connected to the controller board?
Go to step 4. Reseat the connector.
Step Questions / actions Yes No
JFUSES1
Pin Value
1 +24 V dc (doors closed)
2 +24 V dc (doors closed)
3 +24 V dc (doors closed)
4 +24 V dc (doors closed)
5 Between 0.6 and 3.28 V dc
6 Ground
8 Ground
10 Between -3 and +3.3 V dc
11 Ground (no wire )