171
UF-5500 / 4500
11.2.11. Operation Panel Section
Refer to
(P.62) and LCD Section (P.63).
1. NO KEY OPERATION
2. NO LCD INDICATION
CROSS REFERENCE:
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
Keys occasionally
don't work.
NG
NG
Check if CN511 (Main board) or CN2
(operation board) is disconnected.
Replace the PCB.
OK
OK
END
Check the soldering of IC1
(Operation board).
Perform a KEY CHECK.
Repair CN2 and CN511.
Do the keys remain pressed
even when you do nothing?
Perform a KEY CHECK.
OK
END
Replace the PCB
and the switches.
Replace IC1(Operation board).
Replace the LCD.
NG
OK
END
OK
END
NO
Perform an LCD check (refer to LCD / LED
Test) to determine if the LCD is operating
correctly.
Is the cable and connector between the LCD and
operation board connected?
Repair.
YES
NG
IC300 NG
Replace SW50
(Sensor Board)
NG
OK
NG
Check the connection of
signal line and check the
IC300 (Main Board).
Check the voltage at R580,
R578, C563 again.
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.)
Содержание UF-4500
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