Samsung CLX-6250FX Service Manual page 131

● Code
28-001
28-002
28-003
● Symptom
The red LED is turning on and the machine does not operate.
● Possible Cause
The transfer belt unit is installed in the machine but the machine could not read the information from the CRUM.
CRUM information is different from machine.
● Troubleshooting method
1.Check if transfer belt unit is properly installed.
2. Check CRUM PBA connector pins.
Replace the CRUM PBA with normal thing and test it. If the CRUM PBA is defective, replace the transfer belt unit
or CRUM PBA.
3. Check if the Transfer Belt CRUM Harness is defective and check that the connector is properly plugged into the
Engine Board.
4. Replace the Main Board with a known good one and test it. If it works replace Main Board.
CRUM Harness and CRUM Harness and
connector connector
PBA CRUM PBA CRUM
Service Manual
Alignment & Troubleshooting
● Error message
Transfer belt is not installed. Install it.
Transfer belt is not compatible for this machine. Check user's guide.
4-60
CRUM and Main CRUM and Main
board connector board connector
Samsung Electronics