Lexmark Medley 4012-005, Service Manual

Page: 29 / 90

Diagnostic Information
20
4012-0XX
Scanner Service Check
FRU Action
1 LED Array A failed LED array results in either black or
very dark output. If a single LED fails, the
output will have a black or dark vertical
fuzzy stripe. The voltage at fax board J7-3
should be +12 V dc during a scan.
Replace the array if the voltage is correct.
2 Scanner and Fax Board If there is no image (all white image),
check the connection of the scanner data
cable to both the scanner (J1) and the fax
board (J8). A scanner CCD unit failure
results in either a white image, a black
image, or an image with one or more thin
vertical black lines. Replace the scanner
CCD unit.
It is not possible to be certain whether an
all-black or all-white scan failure is due to
the CCD unit or the fax board. In general,
if the machine performs non-scanning
functions involving the fax board (for
example, receiving a fax, exchanging
stored data with the PC, or accepting data
entered from the operator panel) the fax
board is probably OK. If replacing the CCD
unit does not correct the problem, reinstall
the old CCD unit and replace the fax
board.
3 PC Scanner Software If the machine sends faxes properly but
does not create a scanned image file on
the PC, there is a problem with the PC
scanner software installation or configura-
tion.