Shenzhen PM-9000 Express, Service Manual

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Chapter 4 Disassembling/Assembling & Troubleshooting
4.2.2 White Screen & Other Abnormal Screen
In case of faults causing white screen or other abnormal screens,
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Check whether the LCD connection wires are in good contact;
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Replace the LCD connection wires, or replace the LCD if necessary;
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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.
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