ECG Device (EKG3A & EKG6A) – Common Fault Maintenance Guide

This guide provides troubleshooting steps for the most common faults of the ECG series devices.

Common faults include:

• Device does not turn on

• Black screen

• Battery cannot charge

• Poor display quality

• Printing issues

• Abnormal or missing ECG waveforms

Note: For all faults, first check whether corresponding cables or connections are loose or disconnected. Reconnect as needed before further troubleshooting.

1. Failure to Turn On

1.1 AC cable plugged in, indicator ON

• Press the power button:
  Main faults:

  • A: Faulty key plate or loose/disconnected lines

  • B: Power supply board fault or loose/disconnected cables

  • C: If above checks are OK → motherboard may be faulty

1.2 AC indicator OFF when AC cable is plugged in

• Confirm if the issue is the external power supply or the machine (test with another device).

• Main faults:

  • A: Key plate faulty or lines loose/disconnected

  • B: Power supply board faulty or cables loose/disconnected

2. Blank Screen on Startup

• After booting, wait ~10 seconds. Press any key:

  • If the horn sounds → display screen is likely faulty

3. Battery Cannot Be Charged

Symptoms:

• Battery cannot charge

• Device works on AC but shuts down immediately when unplugged

• Battery symbol shows charging but battery level does not increase

Troubleshooting:

1. Remove the battery and plug in AC. Measure the battery interface with a multimeter:

   • Normal voltage: 8.2–8.3V → battery is faulty

   • No or low voltage → power supply board may be faulty

2. Measure 12V output at power supply board.

   • No voltage → power supply board is faulty

   • Voltage OK → motherboard may be faulty

4. Poor Display

Symptoms: flower screen, missing rows, abnormal colors, white screen
Possible causes: display screen, display driver board, motherboard
Troubleshooting: swap related components; most likely faulty are display or driver board

5. Printing Issues

5.1 No print or printing errors

• Causes: printer or motherboard

• Check: paper availability, overheating protection, roller installation, printing door pressure

• If all normal → likely printer or motherboard issue

5.2 Poor print quality

• Symptoms: incomplete, weak, intermittent, or missing print

• Check: printer paper condition and compatibility

• If paper is fine → printer or motherboard issue

6. ECG Lead Connection Issues

• Symptoms: no waveform, abnormal waveform, or missing lead waveform

• Steps:

  1. Clean skin contact area and electrodes with alcohol

  2. Check for lead disconnection; try another lead wire

  3. If unresolved → motherboard may be faulty

7. Data Saving

• Local memory saves up to ~100 cases

• For more cases, insert a USB disk:
  Steps: Main menu → Working mode → Priority storage → Select USB disk → Press confirm