Lexmark 4059-XXX - Manual (Page 131)

Diagnostic Information 2-104
4059-XXX
Serial Port Service Check
Run the “Serial Wrap Test” on page 3-12 .
Note: The Serial Wrap Test is designed to check the serial port
hardware by using a wrap plug (P/N 1329048) and invoking the
Serial Post Diagnostic Test. The test helps isolate the printer from
the serial cable and host. The test provides failure information on the
display for approximately three seconds. If the test indicates a
problem, replace the controller board.
Toner Sensor Service Check
Service Tip: Check the print darkness MENU setting before
checking the toner sensor.
This service check is intended to be used when a 929 Service Error
displays.
FRU Action
1 Developer Drive Assembly Incorrect operation of the developer
drive assembly can cause the printer
to display a 929 error code (Toner
Sensor). Check the developer drive
assembly for correct installation, any
sign of worn, loose or broken parts.
2 Toner Sensor Cable Check the toner sensor assembly
cable to make sure it is properly
seated into the toner sensor. If
correct at both the sensor and
engine board (J10), check the
continuity of the cable. If incorrect,
replace the cable.