JADEVER JCE/JWE Service Manual - V05
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24
CHAPTER 4 TROUBLESHOOTING
4-1 Preliminary checks
1. Is the battery electricity capacity OK?
2. Is AC power cord correctly plugged?
3. Is the weighing pan the right one?
4. Is there anything under the weighing pan?
5. Is the scale at a flat and steady base?
6. Are there any vibrating, rotating, and/or reciprocating equipment around?
7. Is there any air turbulence within the environment?
8. Is there any equipment that generates magnetic field around?
9. Is there rapid temperature change within the environment?
10. Are there any cooling and/or heating sources around?
4-2 Problems and Solutions
Note！:
Any intention to replace PCB and/or to repair components on the board
must proceed cautiously and carefully; otherwise
further irreversible damage(s) may be caused.
Problems Possible Causes Solution
Error in LCD
display, LCD
backlight, or
buzzer
sounding
1、 Malfunction in battery wire & battery
2、 Malfunction in the power circuit
3、 Malfunction in the switch
4、 Malfunction in LCD, LCD driver or the
related circuit of LCD
5、 Malfunction in backlight, backlight
driver or the related circuit of backlight
Check and replace.
The AC
power can
not be
1、 Malfunction in the fuse of the power
socket
2、 Malfunction in the fuse of the
Check and replace.
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