Parallel Port Service Check - Lexmark X642e Service Manual

The printer does not recognize the paper size selected
FRU
1 Back restraint
Side restraint
Snap-in plate
Autosize slider
Autosize finger
2 Switch activate spring
Paper size sending board
3 System board
ITC cable
4 System board
5 Autocomp cable

Parallel port service check

Run the "Parallel Wrap test" on page
Note: The Parallel Wrap Test is designed to check the parallel port hardware by using a wrap plug (P/N
1319128) and invoking the Parallel Diagnostic Test. This test helps isolate the printer from the parallel cable and
host. The test provides failure information on the display for approximately three seconds. If the test indicates
that a problem is detected, replace the controller board.
Action
Check all the paper size parts for damage or broken parts. make sure
the parts operate correctly. If a problem is found, repair as necessary.
If no problem is found, go to step 2.
Make sure the switch activate spring is not bent or broken. Replace
the spring if damaged. If the spring is not damaged, go to step 3.
Set the tray for the paper size that is not recognized and install the
tray in the printer. Select the paper size and corresponding paper
switch from table, below.
Pin Signal Static Static with paper tray in and set to: (V dc)
J26 tray out
Letter
(V dc)
1 PSIZE2 +3.3
2 Ground 0
3 PSIZE1 +3.3
4 PSIZE3 +3.3
5
6
7
8 +3.3 +3.3
9
10
If the voltage on J26 does not change, go to step 4. If the voltage
changes, recheck the printer. If Tray 1Missing is still displayed,
replace the system board assembly.
Ground the appropriate pin on connector J26 on the system board.
Tray 1 Missing should not be displayed. If it is not displayed, go
to step 5. If it still displays, replace the system board assembly.
Check continuity of the autocomp cable. If correct, replace the ITC
assembly. If incorrect, replace the autocomp cable.
3-10.
Legal A4 Exec
0 0 +3.3 +3.3
0 0 0 0
+3.3 +3.3 0 0
0 +3.3 +3.3 0
N/A
N/A
N/A
+3.3 +3.3 +3.3 +3.3
N/A
N/A
Diagnostic information
7002-xxx
B5 A5
0 +3.3
0 0
0 +3.3
+3.3 0
+3.3 +3.3
2-159