Service manual

146 6

Digital Control Troubleshooting

TROUBLESHOOT THE A51 GSP and A52 LCD

Use this procedure when the LCD (Liquid Crystal Display) is unacceptable, or not being

bright.

1. Run the Internal Test 4: A51 GSP.

The A51 GSP can be checked using the internal test 4: A51 GSP.

1. Press [Preset], [System], DIAGNOSTIC TEST, [4], [x1], RUN TEST to run the internal

test 4.

2. Check the test result, PASS or FAIL, that is displayed at the end of the test.

• If this test fails, replace the A51 GSP.

2. Check the A52 LCD (Liquid Crystal Display)

The A52 LCD can be tested using the display test 27 to 31.

1. Press [Preset], [System], DIAGNOSTIC TEST, [2], [7], [x1], RUN TEST to run the

display test 27, and run the other tests with the same manner.

2. If there are any defects on the LCD, replace the A52 LCD.

3. If no correct patterns are displayed, check the A54 Inverter.