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2-106 Service Manual
4069-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.
4 Smart Cartridge Cable
Engine Board
Check the voltage on the smart
cartridge contact. The voltage
measures approximately +5 V dc
when not writing data to the engine
board. If data is being written, the
voltage measures approximately
+12 V dc. If incorrect, disconnect the
cable from J21 on the engine board
and check the voltage on J21-1. The
voltage measures approximately
+5 V dc. If incorrect, replace the
engine board. If correct, replace the
smart cartridge cable.
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.
FRU Action