EPSON AcuLaser C1900/AcuLaser C900 Revision B
Troubleshooting Status Display (AcuLaser C900) 147
ERROR CODE: 6020 
“SECONDARY TRANSFER ROLLER PRESSING/SEPARATION ERROR”
 Detection Timing
When pressing or separation of the Secondary Transfer Roller is impossible.
 Solution
 Electric parts which can cause the trouble:
• Transfer Roller Pressure Solenoid (SL2)
• Transfer Roller Pressure Position Detection Sensor (PC7)
• Engine Board (PWB-A)
ERROR CODE: 6021 “TRANSFER BELT CLEANER CLEARANCE ERROR”
 Detection Timing
When pressing or separation of the Transfer Belt Cleaner is impossible.
 Solution
 Electric parts which can cause the trouble:
• Cleaner Pressure Flapper Solenoid (SL4)
• Belt Cleaner Position Detect Sensor (PC9)
• Engine Board (PWB-A)
ERROR CODE: 6022 “TRANSFER BELT ROTATION ERROR”
 Detection Timing
When the transfer belt of the Intermediate Transfer Belt Unit does not operate.
 Solution
Table 3-28.
Step Action Refer to
WARNING DIAGRAM
Control Signal
1 Check the operation of PC7. p.162 PC7_ON
2 Replace the pressing/separation 
mechanism parts of the Secondary 
Transfer Roller.
- -
3 Check the operation of SL2. p.163 SL2_REM
4 Replace the PWB-A. - -
Table 3-29.
Step Action Refer to
WARNING DIAGRAM
Control Signal
1 Check the operation of PC9. p.162 PC9_ON
2 Replace the pressing/separation 
mechanism parts of the Belt 
Cleaner.
- -
3 Check the operation of SL4. p.163 SL4_REM
4 Replace the PWB-A. - -
Table 3-30.
Step Action Refer to
WARNING DIAGRAM
Control Signal
1 Replace the transfer belt unit. - -