Symptom: Fusing Unit Failure (Error Code 9-22)
This error occurs in any of the following conditions:
•
During printing: If the fusing lamp stays above 190 °C for more than 60 s (sub-code 01)
•
Before start printing: If the fusing lamp takes more than 40 s to reach 165 °C (sub-code
02)
•
Power saver mode (fusing lamp OFF selected): If the fusing lamp takes more than 20
minutes to fall back to 100 °C. (sub-code 03)
•
Power saver mode (fusing lamp Standby selected): If the fusing lamp takes more than
20 minutes to fall back to 100 °C. (sub-code 04)
•
Power saver mode (fusing lamp Standby selected): If the fusing lamp stays below 80
°C for more than 18 s (sub-code 05)
•
During printing: If the fusing lamp stays below 140 °C for more than 1 s (sub-code 07)
•
At any time: If the fusing lamp temperature reaches 250 °C (sub-code 08)
•
At power on: If a thermistor defect (disconnection) is detected (sub-code 09)
Check
Action if Yes
Action if No
Before checking anything, do the following.
Reset the RAM address 80033C(H) to 00(H), then switch the power off, wait for a few sec-
onds, then switch back on. If the problem remains, check the following points.
Sub-code 01, 03, 04:
1. Replace the fusing lamp, thermistor, PSU, FDU and/or FCE.
Sub-code 02, 05, 07:
1. Check if the fusing lamp, thermostat, and/or the thermofuse is(are) open or not.
- If yes, replace the defective component(s).
- If no, go to step 2.
2. Check if ac power is supplied to the lamp from the PSU or not.
- If yes, go to step 3.
- If no, replace the PSU.
3. Check if FDU CN12-1 and/or FDU CN12-2 stays low during printing.
- If yes, replace the PSU, FDU, or FCE.
- If no, check the connection from the PSU to the lamp.
Sub-code 08:
1. Check for any defects in the machine, and replace the defective parts.
If any damage could not be found, go to step 2.
2. Check if the thermistor is shorted or not.
- If yes, replace the thermistor.
- If no, try replacing the FDU and/or FCE
Sub-code 09:
1. Check the connection between the FDU (CN25) and the thermistor.
TROUBLESHOOTING
August 2nd, 1995
SERVICE CALL CONDITIONS
6-28
