JADEVER SCALE CO., LTD
5-2 Problems and solutions
Problem
Power on
failure
Charging
Failure or
Service Life
Shortened
Possible Cause
Lead-acid battery
defective
Charging transformer
problem
CPU / Crystal
11.0592M (oscillating
circuit) fault
LCD or related LCD
circuit fault
Power circuit fault
Malfunction in ON/OFF
switch
Lead-acid battery
defective
Charging transformer
problem
Components or power
circuit defective
Basic Inspection and
troubleshooting
Remove battery and power on by using
charging transformer to see if the failure is due
to battery defect.
Please try a normal charging transformer to
see if the scale can be powered on.
Replacement is needed.
After confirming that there is no broken board
line or short circuit of connection between LCD
and other conducting objects, please replace
LCD.
Please check the working voltage of CPU (pin
44)/LM2930/TIP32C/Q7/4069(pin3/6/14)/Q5,
then replace the one which working voltage is
abnormal.
Replace the ON/OFF switch
Remove battery and power on by using
charging transformer to see if the failure is due
to battery defect.
Please try a normal charging transformer to
see if the scale can be powered on.
1. Fuse burn down, replacement is required.
2. Check D2/ Q1(D313)/U5
Q2/Q3/Q4,then replace the defective
components.
3. Charge lamp defective, replacement is
required.
4. The polarity or the charging lamp is
reversed.
17 JCL Service Manual
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