KEY-IN
TROUBLESHOOTlNG
VCR POWER
TROUBLESHOOTlNG
FLOW CHART NO. l-l
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1
FLOW CHART NO. 1-2
The VCR
isdead.
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Key-h Input is not received.
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Unplug the AC power cord.
Replug
it a few minutes later.
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Is the key switch in good contact 7
No
Check the switch contact.
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/;;?r;
short-circuit in the key
NO
Check
IC8801
(IXZSZZCE),
IClOOl
4
(IX2443CE)
and switches for poor
L
soldering.
IS the fuse
F701
alright
in the TV
mother
PWB?
Replace the fuse
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+
YES
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1
YES
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1
*
Are signals received at pin
(71)
of
ND
ICBBOI
and pin
(4)
of
IClOOl
when
kh,eck,key
lines to input
ICBBOl
or
+
the key is activated
7
1
YES
Are the
UR12V
and
UR7V
lines
normal in the VCR
PWB?
Is the AT
5V
line normal ?
NO
~
Check the AT
5V
line,
IC9901
(NJM2930LOS)
and
R9903.
Are the
ATSV
and
GND
lines
NO
properly connected with
ICBBOl
?
Check poor soldering.
Check
ICBBOl
IClOOl
and signal
1
:eady(L).
’1
I’ne
of serial
datas
serial clock and
INFRARED R/C
TROUBLESHOOTiNG
FLOW CHART NO.
1-3
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No operation is possible from the
infrared remote control.
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1
YES
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f
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1
Does the infrared remote control
function ?
lLwl
control as required.
Replace the infrared remote
/
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Is there oscillation at pins (31) and
(32)
of
ICBBOl
fIX2522CE)
?
Replace
ICBBOl
and /or
FL880
1.
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j
YES
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1
YES
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Is
5V
applied at pin
(2)
of the
remote control receiver ?
Check the
5V
and
GND
lines.
I
t
Does pin
(20)
of
IC8801
change
from
*
Ii
”
to
”
L
-
level when
NO
L
Check pin
(20)
of
ICBBOl
or
ICBBOZ
the AC cord is plugged in or ALL
+
(PST529DZ).
CLEAR button is pressed and
t
released?
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YES
,
Check pin
(5)
of
IClOOl
and /or
receiven.
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YES
1
P,y;
“;‘c
(!)
of
ICB~Ol
than
e
NO
to
“Ii
level w
R
Check power key input to
IClOOl
en
t
the power button is pressed
?
and serial dataslclocks between
.
IClOOl
and
ICBBOl.
1
YES
1
NO
away from
the set
?
F
Reposition the set not to be
exposed to strong light.
YES
Is there short-circuit in the key
input or
ICl
00
1
or
IC880
1
(IX2522CE)
?
1
YES
NO
Check key input terminals.
-NO
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S
the PC
9V
line normal
7
1
YES
++I
in
(6)
of connector
EP
an
IC752
I
S
the PC
5V
line normal ?
1
YES
NO
t
Check Q9903.
Check
IClOOl
ICBBOl
and signal
line of serial
data,.
serial clock and
ready
(L)
.
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Check wire harness to mechanism.
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