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i
2-9. Micom
Problems
Bad PCB
electric power.
Symptom
All display
LCDS are off.
Abnormal
display LCD
operation
Causes
Bad connection
between Main PCB
and display circuit,
Defective PCB trans.
DefectivePCBelectric
circuit parts.
Bad connection
between Main PCB
and display circuit.
Defective
LED
module.
Bad connector
connection
from main
PCB to display PCB,
PCB Trans winding is
cut.
PCB Trans temperature
fuse is burnt out.
Defective regulator IC
7812, 7805).
PCB electric terminal
fuse is burnt out.
STR Parts are
damaged.
Lead Wire connecting
main PCS and display
PCB is cut or connector
terminal connection is
bad.
Defective LED.
Checks
Visual check on connector
connection.
Check resistance
of PCB Trees
input and output terminals wifh
a tester, (If resistance is infinity,
trans winding is cut).
Check voltage at input/output
terminals.
Check fuse in PCB electdc
terminal with a tester.
Check if STR No. 2 and 3 pins
are cut when power is off.
Check Lead Wire terminals
connecting Main PCB and
display PCB with a tester.
Check if all LEDs are on when
Main PCB Test switch is
pressed (or when both freezer
key and power freezer key are
pressed at the same time for
more than one second.)
Measures
Reconnect
connector.
Replace PCS Trans
or PCB.
Replace regulator.
Replace pCR fuse.
JReplace parts.
Reconnect Lead
Wire and directly
connect defective
contact terminal to
Lead Wire.
Replace display
PCB.
Remarks
Applicable
to
model without
dispenser.
Refer to electric
circuit in circuit
explanation.
Applicable
to
model with
dispenser.
Refer to display
circuit in circuit
explanation.
o
m
_o
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