Operation Panel Section; Sensor Section - Panasonic UF-5500 Service Manual

11.2.11. Operation Panel Section

Refer to Operation Board Section (P.62) and LCD Section (P.63).
1. NO KEY OPERATION
Do the keys remain pressed
even when you do nothing?
Perform a KEY CHECK.
Keys occasionally
don't work.
Check if CN511 (Main board) or CN2
(operation board) is disconnected.
Repair CN2 and CN511.
2. NO LCD INDICATION
CROSS REFERENCE:
LCD / LED Test (P.114)

11.2.12. Sensor Section

Refer to SENSORS AND SWITCHES for the circuit description.
Perform an SENSOR CHECK to determine if the sensor is operating correctly.
1. Check the pickup sensor .......... "FAILED PICKUP"
NG
OK
OK
NG
Perform an LCD check (refer to LCD / LED
Test) to determine if the LCD is operating
correctly.
NG
Is the cable and connector between the LCD and
operation board connected?
YES
Replace the LCD.
NG
Replace IC1(Operation board).
Check the voltage at
Pin AE20 of IC300 (Main Board).
The sensor lever is pressed: 0V
(Recording paper exists.)
The sensor lever is released: 3.3V
(No recording paper.)
OK
IC300 NG
Replace the PCB.
END
Check the soldering of IC1
(Operation board).
Perform a KEY CHECK.
OK
OK
END
NO
OK
END
Check the connection of
signal line and check the
NG
IC300 (Main Board).
Check the voltage at R580,
R578, C563 again.
Replace SW50
(Sensor Board)
171
Replace the PCB
NG
and the switches.
END
Repair.
NG
UF-5500 / 4500