Service manual

Chapter 4 Disassembling/Assembling & Troubleshooting

4.2.2 White Screen & Other Abnormal Screen

In case of faults causing white screen or other abnormal screens,

■ Check whether the LCD connection wires are in good contact;

■ Replace the LCD connection wires, or replace the LCD if necessary;

■ Replace the main control board if the fault still exists.

4.2.3 Encoder Faults

1. If all other functions (indicator, alarm, buttons) of the button panel are normal,

proceed to step 2; otherwise, replace the button panel;

2. Check whether short-circuit or abnormal open-circuit occurs in the encoder pad;

3. Replace the encoder.

4.2.4 No Audio Alarm

1. Check whether the audio alarm function is disabled in the software settings;

2. Replace the speaker;

3. Replace the button panel.

4.2.5 Printing Failure

1. Check whether there is any alarm about the recorder. If any, eliminate it;

2. Check whether the recorder indictor is on;

3. If not, check the connection wire for inputting signals to the recorder;

4. Check whether the recorder module is enabled in the maintenance menu;

5. Check the power cord of the recorder (including the recorder power PCB);

6. Replace the recorder module.

4.2.6 Abnormal Paper Drive

1. Check whether there are blocks on the paper roller of the recorder;

2. Check whether there are blocks in the gear cluster of thermal assembly of the

recorder;

3. Check whether the voltage input of the recorder is larger than 17.6V.