Canon PC-D320, Service Manual

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PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
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4.3.4 Test mode function problems
• Faulty control panel test
The LCD panel does not display correctly.
(1) Check the connection between the OPCNT board (J1) and the SCNT board (J503).
(2) Check the connection between the LCD unit and the OPCNT board (J5).
(3) Replace the LCD unit.
(4) Replace the OPCNT board.
(5) Replace the SCNT board.
The LED lamp fails to go ON.
(1) Check the connection between the OPCNT board (J1) and the SCNT board (J503).
(2) Replace the OPCNT board.
(3) Replace the SCNT board.
The keys on the operation panel fails to work properly.
(1) Check the connection between the OPCNT board (J1) and the SCNT board (J503).
(2) Replace the OPCNT board.
(3) Replace the SCNT board.
• Faulty contact sensor test.
The LED of the contact sensor fails to go ON properly.
(1) Check the connection between the Contact sensor and the SCNT board (J506).
(2) Replace the Contact sensor.
(3) Replace the SCNT board.
• Faulty DRAM test.
The indication “READ & COMPARE NG” appears.
(1) Perform the DRAM test again. In case “READ & COMPARE NG” still appears,
replace the SCNT board.
• Faulty sensor test.
DES sensor fails to operate properly.
(1) Check whether the actuator of DES sensor is in correct position.
(2) Check the connection between the DES sensor and the SCNT board (J509).
(3) Replace the DES sensor.
(4) Replace the SCNT board.
DS sensor fails to operate properly.
(1) Check whether the actuator of DS sensor is in correct position.
(2) Check the connection between the DS sensor and the SCNT board (J509).
(3) Replace the DS sensor.
(4) Replace the SCNT board.