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2-96 Service Manual
5016-001
Serial Port Service Check
Run the “Serial Wrap Test” on page 3-14.
The Serial Wrap Test is designed to check the serial port hardware,
by using a wrap plug (P/N 1329048) which invokes the Serial Post
Diagnostic Test. The test isolates the printer from the serial cable
and host, displaying failure information for approximately three
seconds. If the test indicates a problem, replace the controller board.
Toner Level Detect Service Check
Note: The toner level sensor is mounted on the same board as the
new cartridge detect sensor and is located in the bottom of the
printer. The toner cartridge contains two mirrors mounted behind a
window in the cartridge that reflect infrared light from an LED,
mounted on the sensor board, back to a photo transistor also
mounted on the sensor board.
The printer does not detect the level of toner left in the cartridge.
FRU Action
1 Toner Cartridge Try a new cartridge for cartridges for which the
level of toner, has not been sensed.
2 Toner Level/
New Cartridge
Detect Sensor
Board
Engine Board
TE Cable
Check the sensor board assembly for signs of
excessive toner, paper dust or other contaminants.
Blow off contaminants with clean dry air. If the
sensor board is clean, replace the FRUs in the
following order:
1. Toner level/new cartridge detect sensor board
2. Engine board
3. TE cable