Registration Sensor; Print Timing Sensor - Panasonic UF-5500 Service Manual

UF-5500 / 4500

6.12.5. Registration Sensor

This sensor detects whether the recording paper is at the sensor position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-AF20pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-AF20pin becomes high level.
[Registration & Manual paper sensor]
Shelter Plate
PS51
Resist & Ptop Board

6.12.6. Print Timing Sensor

This sensor detects whether the recording paper is at the printing position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-W26pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-W26pin becomes high level.
[Print timing sensor]
Shelter Plate
REGIST & PTP Board
CN50 CN66
R51
J58
J59
1
1
2 2
Toner
Board
Photo-transistor
Paper exists ON
No paper OFF
CN64
CN50 CN66
R50
1 1
PS52
3 3
Toner
Board
Photo-transistor
Paper exists ON
No paper OFF
+3.3V
CN64 CN508
2
2
+3.3V
R582
10 10
R583
Signal (IC300-AF20pin)
Low level
High level
+3.3V
CN508
2 2
+3.3V
R587
9 9
R585
Signal (IC300-W26pin)
Low level
High level
56
IC300
AF20
C565
Main Board
IC300
W26
C569
Main Board