TROUBLE SHOOTING TABLE
TROUBLE SHOOTING TABLE
(Continued)
NO RASTER
I
Check
t
I
Blown out.
I
Replace the fuse.
I
Abnormal
I
Check pin (1) of
voltage
31
at
AC)
I
The fuse is again blown out.
I
I
Check
and
I
I
C h e c k S e c o n d a r y
I
Normal
Abnormal
Normal
Check
and 0704.
C h e c k
a n d 0 7 3 2 .
NO
I
I
Check
and
I
oscillate ?
N O
YES
r
I
Does horizontal circuit
Bus error
mode.
See
1
or Check
Checking the
protector circuit
(The protector
circuit still works
even if there is no
vertical waveform
at pin (2) of
- - - - - -
I
I
Check
I
and
If a bus error happens, the LED RED (pin 3) indicator starts flashing and the power
is turned off. The power key is still effective.
F i g . 1 E E P R O M
17-1
CIRCUITS TO BE CHECKED:
l
Tuner.
NO PICTURE, NO
l
l
Automatic Gain Control.
l
Power Source.
Does the noise level increase at max.
received.
No snow noise.
I
Check the tuner supply voltage MB
must be
BP must
must be
and
channel preset data check.
I
Normal
Check the tuner
I
I
Normal
Abnormal
Dose noise or signal appear at pin (21)
of
?
YES
Do noise or signal
appear at pin (1)
I
and its related
I
of
?
parts.
I
r - - - - - - - - - - l
I
I
Check
I
I
c i r c u i t s
I
I
I l - - - - - - - - - - l
Check the tuner
I
I
circuit.
I
C h e c k
I- - - - - - m - e - t l - - - - - - , - - - l
CIRCUITS TO BE CHECKED:
l
Amplifier Circuit.
l
Sound Detector Circuit.
I
Does signal appear at pins
(1) and (8) of
?
Does signal appear at pin
I
Check
and peripheral
(3) of
?
circuit.
I
I - - - - - - - - - - - - - - - I
YES
Check (5) connector
, and peripheral circuit.
- - - - - - - - - - - - - - - I
17-2
