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2-9. Micom
Problems
Symptom
Causes
Checks
Measures
Remarks
Bad PCB
AU display
Bad connection
Bad connector
Visual check on connector
Reconnect
electric power.
LEDS ere off,
between Main PCB
connection from main
connection,
connector.
and display circuit.
PCB to display PCB.
Defective PCS trans.
Abnormal
display LED
operation
DefectivePCB
electric
circuit parts.
Bad connecBon
between Main PC8
and display circuit.
Defective LED
module.
PCB Trans winding is
cut.
PCB Trans temperature
i
fuse is burnt out.
Defective regulator IC
7812, 7805).
PCB electric terminal
fuse is burnt out.
STR Parts are
damaged.
Lead Wire connecting
main PCB and display
PCB is cut or connector
terminal connection
is
bad.
Defective LED.
Check resistance of PCB Trans
input and output terminals with
a tester. (If resistance is infinity,
trans winding is cut).
Check voltage at input/output
terminals.
Check fuse in PCB electhc
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
_ressed at the same time for
more than one second.)
Replace PCB Trans
or PCB.
Replace regulator.
Replace PCB fuse.
Replace parts.
Reconnect Lead
Wire and directly
connect defective
contact terminal to
Lead Wire.
Replace display
PCB.
Applicable
to
model without
dispenser.
Refer to electdc
circuit in circuit
explanation.
Applicable to
model with
dispenser,
Refer to display
circuit in circuit
explanation.
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