Citizen CTB-300 - Weighing Malfunctions

CTB serial bench scale service manual
18
13 4 Can’t weigh
START
CHK whether can
show internal
counts
Add load on
pan, CHK
counts raise
Do calibrate
CHK load cell input circuit
CHK M/B
AU1
pin15=5V
CHK power circuit
Add load on pan,
CHK output
between AU1 pin1
and pin2 signal
change
Check load cell
CHK AU1 and around circuit
Y
N
Y
N
N
Y
Y
N