Lexmark T430 Service Manual page 42

4048-1xx
Service error codes (9xx) (continued)
Error Description
940 LV Power Supply
941 Controller card
950 Controller card
951 Controller card
952 NV failure:n
953 NVRAM chip failure
954 NVRAM CRC failure
2-8
Service Manual
Action
The low voltage power supply zero
crossover test failed.
Check the LVPS for correct installation.
Make sure the connector on the LVPS
assembly is firmly seated with the
connector on the interconnect card
connector.
This error may also be caused by a noisy
AC input power source.
• Be sure the correct LVPS has been
installed.
• If all the above are correct, replace the
LVPS assembly.
This error indicates an open fuse in line to
tray 2. POR the printer to reset the fuse.
Check for +24 V dc on J21, pin 6. If
correct, the fuse is okay. If incorrect,
remove the drawer and check resistance
between pin 6 and 5 of the tray. If the
resistance is less than 50 ohms, replace
the drawer.
There is a mismatch between the
variables in the EPROM on the operator
panel card and those in the secure
NVRAM on the controller card. This can
only occur after a replacement of one of
the two parts and the replaced part is
faulty. Replace the controller card or the
operator panel.
Warning: Always replace only one at a
time with a POR between.
The secure NVRAM was not detected on
the controller card. Replace the controller
card.
Recoverable error. Reset (POR) the
printer.
Indicates the NVRAM chip has failed.
Replace the controller card.
Indicates the NVRAM experienced a CRC
failure. Replace the controller card.