Konica-Minolta bizhub C7720
Troubleshooting. Jam 04. Misfeed at 2nd image transfer section
Detection timing
Type | Description |
---|---|
Detection of misfeed at 2nd image transfer section | • A sheet of paper does not turn OFF the sensor in front of tim. roller (PS1) after a predetermined period of time has elapsed since the sheet has turned ON the PS1. |
• A sheet of paper does not turned ON the paper exit sensor (PS2) after a predetermined period of time has elapsed since the sheet has turned ON the sensor in front of tim. roller (PS1). | |
Detection of paper left in 2nd image transfer section | • The sensor in front of tim. roller (PS1) is turned ON when the main power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset. |
2nd image transfer section loop registration reversing jam | • For paper fed from the tray, loop forming has not been complete before a sheet enters the timing roller because the rise timing of load to perform registration is earlier than the rise timing of load to form a loop. |
Relevant electrical parts
Transport motor (M1)
Fusing motor (M2)
Tim. roller clutch (CL1)
Sensor in front of tim. roller (PS1)
Paper exit sensor (PS2)
Printer control board (PRCB)
Action
Step | Action | Control signal | Location |
---|---|---|---|
1 | Initial check items. | ||
2 | PS1 I/O check, sensor check | PRCB CN1-3 (ON) | C to D-19 |
3 | PS2 I/O check, sensor check | ||
4 | CL1 operation check | PRCB CN1-5 (ON) | C to D-18 |
5 | M1 operation check | PRCB CN27-14 (REM) PRCB CN28-2 (LOCK) |
C to D-23 |
6 | M2 operation check | PRCB CN27-4 (REM) PRCB CN27-7 (LOCK) |
C to D-22 |
7 | Change PRCB |