Comen CM300 - Troubleshooting Guide; Failure to Power on with AC Supply; Failure to Power on with Battery; White or Black Screen

Shenzhen Comen Medical Instruments co., ltd.
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message is presented, eliminate the technical alarm first.
For detailed information on technical alarm message, possible cause and corrective action refer
to the electrocardiograph’s Operation Manual.
4.5 Troubleshooting Guide
4.5.1 4.5.1 Failure to power on with AC supply
Symptoms
Possible Cause
Correction Action
The electrocardiograph
fails to start with AC
power.
AC power supply cable is not
connected well.
Check whether the power supply cable is
reliably connected
The two fuses defective
Remove power supply cable and open the
fuse-boxes then ensure each of them is
good by multi-meter. If not, change new
fuses.
AC power supply unit defective
Switch the multi-meter to AC voltage gear
and test the transformer output. The
reasonable output should be 18V-20V
Main board defective
replace a new main board
Keypad defective
replace a new keypad
4.5.2 Failure to power on with battery
Symptoms
Possible Cause
Correction Action
The electrocardiograph
fails to start with
battery.
Battery defective.
Check the battery voltage is around 14.8V
Main board defective
replace a new main board
4.5.3 4.5.3 White or Black Screen
Symptoms
Possible Cause
Correction Action
White or Black screen
Keypad cable or connect cable is
Check the keypad cable or connector cable