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2-9. Micom
P
o r
b
e l
m
s
S
y
m
p
o t
m
Bad PCB
All display
LCD are o .
electric power.
DefectivePCB electric
Abnormal
display LCD
operation
C
a
s u
s e
Bad connection
Bad connector
between Main PCB
connection from main
and display circuit.
PCB to display PCB.
Defective PCB
PCB transformer
transformer.
winding is cut.
P
C
B
t
a r
n
f s
temperature fuse is
burnt out.
Defective regulator IC
c
c r i
u
t i
p
r a
. s t
7 (
8
1
, 2
7
8
0
PCB electric terminal
fuse is burnt out.
STR Parts are
a d
m
a
g
e
. d
Bad connection
Lead Wire connecting
between Main PCB
main PCB and display
and display circuit.
PCB is cut or connector display PCB with a tester.
t
r e
m
n i
l a
o c
a b
. d
Defective LCD.
Defective LCD.
C
h
c e
s k
Visual check on connector
connection.
Check resistance of PCB
transformer input and output
r o
m
r e
t
r e
m
i
a n
s l
i w
h t
a
t
s e
(If resistance is in nity, trans
winding is cut).
Check voltage at input/output
5
. )
t
r e
m
i
a n
. s l
Check fuse in PCB electric
terminal with a tester.
Check if STR No. 2 and 3 pins
a
e r
c
t u
w
h
e
n
p
o
w
r e
Check Lead Wire terminals
connecting Main PCB and
n
n
c e
o i t
n
s i
Check if all LCD are on when
Main PCB Test switch is
r p
s e
e s
d
(
r o
w
h
e
n
b
key and power freezer key are
pressed at the same time for
more than one second.)
M
e
s a
r u
s e
Reconnect
connector.
Replace PCB
transformer or PCB.
e t
. r
Replace regulator.
Replace PCB fuse.
Replace parts.
s i
o
. f f
Reconnect Lead
Wire and directly
connect defective
o c
t n
c a
t t
r e
m
n i
l a
o t
L
a e
d
W
r i
. e
Replace display
PCB.
o
h t
f
e r
z e
r e
R
e
m
r a
s k
Applicable to
model without
d
s i
p
e
n
e s
. r
Refer to electric
c
c r i
u
t i
n i
c
c r i
u
t i
explanation.
Applicable to
m
o
d
l e
i w
h t
dispenser.
Refer to display
circuit in circuit
x e
p
a l
a n
o i t
. n
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