3-7
NO
NO
NO
START
Does remote control
work normally?
Do all the
buttons work
normally?
Check waveform of
IC500 Pin
13
.
Check waveform
of Q500 Pin
2
.
Is Digitron on normally?
LED ON?
Check waveform
of IC500 Pin
6
.
Is oscillation of
X501 normal?
Is waveform of IC500
Pin
78
normal?
Check waveform
of IC500 Pin
13
.
Does pulse
waveform of RE500 Pin
3
appear?
Is IC500
Pin
24
connected to
RE500 Pin
3
?
Is RE500 Pin
2
5V?
Power on.
Check and replace R516,
R507, R506, R500, R505,
R504, R512 and R503.
Solder defective parts again
Solder defective parts
Replace Q500.
Solder Key part.
Check Power.
Replace IC501.
Replace IC500.
Replace LED501.
Replace RE500
Re-solder.
Recheck
Replace IC500.
Complete repairing Front B/D.
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
CD
4. Front Circuit (Digitron & key)
w
w
w
.
r
t
v
-
h
o
r
v
a
t
-
d
j
.
h
r
