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4-10

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

 If all other functions (indicator, alarm, buttons) of the button panel are normal, proceed to

step 2; otherwise, replace the button panel;

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

 Replace the encoder.

4.2.4 No Audio Alarm

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

 Replace the speaker;

 Replace the button panel.

4.2.5 Printing Failure

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

 Check whether the recorder indictor is on;

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

 Check whether the recorder module is enabled in the maintenance menu;

 Check the power cord of the recorder (including the recorder power PCB);

 Replace the recorder module.

4.2.6 Abnormal Paper Drive

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

 Check whether there are blocks in the gear cluster of thermal assembly of the recorder;

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

Mindray DPM 4 Service Manual

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