Jadever JWE Service Manual - page 18
JADEVER SCALE CO., LTD
JWE service manual
16
13)
Set RTC Function.
(Enable);
(Disable)
5. Trouble shootings
5-1 Preliminary checks
Is the bubble of the level indicator at the center?
Is the battery electricity capacity ok?
Is power cord connected both with the scale and with the outlet properly?
Is the weighing pan the right one?
Is there anything under the weighing pan?
Is the scale at a flat and steady base?
Are there any vibrating, rotating, and/or reciprocating equipment around?
5-2 Problems and solutions
Problem
Possible Cause
Basic Inspection and troubleshooting
Power on failure
Lead-acid battery defective
Make sure there is no bad connection of
the battery connection and the voltage is
above 5.8V. Remove battery and power on
by using charging transformer to see if the
failure is due to battery defect.
Charging transformer problem
Please try a normal charging transformer
to see if the scale can be powered on.
LCD or related LCD circuit fault
After confirming that there is no broken
board line or short circuit of connection
between LCD and other conducting
objects, please replace LCD.
CPU / Crystal11.0592M
(oscillating circuit) fault
Replacement is needed.
Power circuit fault
Please check the working voltage of CPU
(pin44) / LM2930 / B857 / Q7 /
U4*S80841AL, then replace the one which
working voltage is abnormal.
I/O switch fault
Replacement is needed
Charging Failure Lead-acid battery defective
Remove battery and power on by using
charging transformer to see if the failure is
due to battery defect.
Charging transformer problem
Please try a normal charging transformer
to see if the scale can be powered on.
Components or power circuit 1. Fuse burn down, replacement is