| Problem |
Causes |
Check procedures/corrective measures |
| (1) The machine does not operate when the power switch is turned on. |
No electricity at the power outlet. |
Measure the input voltage. |
| The power cord is not plugged in properly. |
Check the contact between the power plug and the outlet. |
| The top cover is not closed completely. |
Check the top cover. |
| Broken power cord. |
Check for continuity. If none, replace the cord. |
| Defective power switch. |
Check for continuity across the contacts. If none, replace the power source PWB |
| Blown fuse in the power source PWB. |
Check for continuity. If none, remove the cause of blowing and replace the power source PWB |
| Defective interlock switch. |
Check for continuity across the contacts of interlock switch. If none, replace the power source PWB |
| Defective power source PWB. |
Replace the power source PWB |
| Defective control PWB. |
Replace the control PWB |
| (2) Right cooling fan motor does not operate. |
Broken right cooling fan motor coil. |
Check for continuity across the coil. If none, replace the right cooling fan motor. |
| Defective harness between right cooling fan motor and control PWB (YC315), or improper connector insertion. |
Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. |
| Defective control PWB. |
Replace the control PWB |
| (3) Left cooling fan motor does not operate. |
Broken left cooling fan motor coil. |
Check for continuity across the coil. If none, replace the left cooling fan motor. |
| Defective harness between left cooling fan motor and control PWB (YC104), or improper connector insertion. |
Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. |
| Defective control PWB. |
Replace the control PWB |
| (4) Registration clutch does not operate |
Broken registration clutch coil. |
Check for continuity across the coil. If none, replace the registration clutch. |
| Defective harness between registration clutch and control PWB (YC308), or improper connector insertion. |
Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. |
| Defective control PWB. |
Replace the control PWB |
| (5) Paper feed clutch does not operate. |
Broken paper feed clutch coil. |
Check for continuity across the coil. If none, replace the paper feed clutch. |
| Defective harness between paper feed clutch and control PWB (YC308), or improper connector insertion. |
Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. |
| Defective control PWB. |
Replace the control PWB |