NO PICTURE (SOUND NORMAL)
Checked Circuit
l
V ide o A
Check for the voltage at the
collector, emitter and base
of
and
,
Normal
Make
be
grounded.
I
I
If the both legs
of
are
shorted, does
picture appear?
3
-
-
I
I
,
I
Checked Circuits
l
Circuit
l
Audio Output Circuit
I
Hum is created
When the pin 6 of
is
grounded, does sound
come out?
I
No
Check for the
voltage at the
pin 5 of
I
I
I
I
I -
I
Normal
--VW-
:
I
I
I
I
Apply main ripple to the
pin 1 of
via
capacitor and
ohm
resistor.
S p e a k e r
L
-
-
e
-
e
- -
l
I
I
I
I
Summary of Contents for 8C221
Page 28: ...PRINTED WIRING BOARD ASSEMBLIES I Figure 18 PWB A Component Side 28 ...
Page 29: ...Figure 19 PWBA Wiring Side 29 ...
Page 30: ...Figure 20 FWB B Component Side 30 ...
Page 31: ...Figure 21 PWB B Wiring Side 31 ...
Page 32: ... PWBF0491CE ...
Page 33: ...Figure 26 PWB E Component Side Figure 27 PWB E Wiring Side 33 ...
Page 34: ...Figure 28 PWM A Component Side Figure 29 PWM A Wiring Side 34 ...
Page 40: ... I 8 VPP W 1 2 WXJ H I 3 3 4Vpp H 1 4 6 4Vpp U I I 51 WPP t 0 1 ...
Page 46: ...S H A R P 46 ...
