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3. TROUBLE SHOOTING
3.1 TROUBLE SHOOTING LOOP
POWER ON
NO DISPLAY
COUNT DOWN?
CHECK POWER SUPPLY,
CPU,LCD,KEYBOARD
OK
COUNTS AND
THEN ZERO?
OK
GHOST
PROPER READOUT?
CHECK POWER
SUPPLY,LCD,LCD
DRIVER IC,R39,40
OK
INCORRECT
RE-CALIBRATE
THE SCALE
CORRECT READOUT?
OK
DISPLAY RANDOM
FIGURE
CHECK CPU,LCD,
LCD DRIVER IC
SHOW ¡00000¡
CHECK LOAD CELL,
A/D UNIT,OFFSET
VALUE
UNSTABLE
CHECK PLATTER
STOPPER,LOAD
CELL,A/D UNIT,
BAD SOLDERING
CAN¡T REACH THE
FULL CAPACITY
CHECK PLATTER
STOPPER,LOAD
CELL,OFFSET
VALUE
NORMAL OPERATION
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