| Component |
CN |
PCB |
State |
Symptom |
| Paper Exit Sensor |
324-1 |
BCU |
Open |
The Paper Jam indicator will light whenever a copy is made. |
| Shorted |
The Paper Jam indicator lights even if there is no paper. |
| Paper Overflow Sensor |
324-4 |
BCU |
Open |
The paper overflow message is not displayed when the paper overfull condition exist. |
| Shorted |
The paper overflow message is displayed. |
| Paper Overflow Sensor |
703-1 |
CKB |
Open |
The paper overflow message is not displayed when the paper overfull condition exist. |
| Shorted |
The paper overflow message is displayed. |
| Paper Present Sensor |
330-1 |
BCU |
Open |
LED does not light even if paper is in 1-bin tray. |
| Shorted |
LED lights even if paper is not in 1-bin tray. |
| Paper Size Sensor (Bypass) |
860-6 |
BCU |
Open |
The CPU cannot detect the proper paper size, and misfeeds may occur when a copy is made. |
| Shorted |
| Paper Size Sensor (Duplex) |
860-6 |
BCU |
Open |
The CPU cannot detect the proper paper size, and misfeeds may occur when a copy is made. |
| Shorted |
| Registration Sensor |
321-5 |
BCU |
Open |
The Paper Jam indicator will light whenever a copy is made. |
| Shorted |
The Paper Jam indicator lights even if there is no paper. |
| Relay Sensor |
702-1 |
CKB |
Open |
The Paper Jam indicator will light whenever a copy is made. |
| Shorted |
The Paper Jam indicator lights even if there is no paper. |
| Scanner HP Sensor |
228-1 |
SIO |
Open |
SC120 is displayed. |
| Shorted |
The CPU does not detect the scanner home position and the scanner motor does not stop. |
| Shift Sensor |
903-1 |
STB |
Open |
SC770 is displayed. |
| Shorted |
| TD Sensor |
327-1 |
BCU |
Open |
SC390 is displayed. |
| Shorted |
| Upper Relay Sensor |
307-4 |
BCU |
Open |
The Paper Jam indicator will light whenever a copy is made. |
| Shorted |
The Paper Jam indicator lights even if there is no paper. |