Lexmark X642e Service Manual page 71

Service error codes (9xx.xx) (continued)
Error Sub
Display text
code codes
937 .71 Loss of lock detected by
higher level code. Motor
is type 1.
937 .80 Driver over temperature
detection. Motor is
type 0.
939 .00 RIP–engine
communications lost.
940 .00 LVPS zero-crossing test
failed.
947 .00 PQET RAM test
incomplete,
PQET RAM test did not
complete,
PQET RAM test failed
MARCH0
PQET RAM test failed
MARCH1
PQET RAM test busy
failure
948 .00 Pel clock check failed
949 .00 Delay line calibration
failure
950 .00 NVRAM mismatch
Description
• Defective motor cable
• Defective main drive motor
• Paper jams
• Excessive gear loading in
gearbox assembly
System board
• Incorrect LVPS installed
• Noisy AC power source
• LVPS to system board cable
loose
PQET failed to pass RAM tests on
the system board
System board
System board
Action
Go to "Main drive service check"
on page 2-153.
Go to "Main drive service check"
on page 2-153.
POR the printer several times, if the
error code continues to be
displayed, replace the system
board. See "System board and
inner shield removal —models
X644e/X646e" on page 4-131.
Check to make sure the correct
LVPS assembly has been installed.
If the correct supply is installed,
check to make sure the LVPS to
system board cable is installed
correctly. If correct, replace the
LVPS assembly. See "Low voltage
power supply removal" on
page 4-109.
Replace the system board. See
"System board and inner shield
removal —models X644e/X646e"
on page 4-131.
Replace the system board. See
"System board and inner shield
removal —models X644e/X646e"
on page 4-131.
Replace the system board. See
"System board and inner shield
removal —models X644e/X646e"
on page 4-131.
Go to "950.00 through 950.29
EPROM mismatch failure" on
page 2-120. or go to "950.30
through 950.60 EPROM mismatch
failure" on page 2-121.
Diagnostic information
7002-xxx
2-33