Serial Port Service Check; Toner Sensor Service Check - Lexmark 43J3400 - Optra S 2455 B/W Laser Printer Service Manual

4059-XXX

Serial Port Service Check

Run the "Serial Wrap Test" on page
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
1 Developer Drive Assembly
2 Toner Sensor Cable
3-12.
Action
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.
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.
Diagnostic Information
2-104