27
SX51LF7
SX51LF8
TROUBLE SHOOTING TABLE
(Continued)
NO PICTURE, NO SOUND
Does noise signal appear at
pins (3) and (22) of IC305 ?
NO SOUND
No snow noise.
Does noise or signal appear at pin (40)
of IC801 ?
Noise increases but no signal is
received.
Check the tuner supply voltage LB and
HB must be approx. 5V. BT must be
approx. 32V. and CH preset data check.
Check the tuner AGC at
TP201.
Does noise or
signal appear at
pin (38) of IC801 ?
Check IC801 and
its related circuit.
Check IC401 and
related circuit.
Check pin (1) of
SF201, Tuner and
related circuit.
Check pin (37)of
IC801 and related
circuit.
Check pin (27) of
IC801, Tuner and
related circuit.
Check pin(38) of
IC801.
Does the noise level increase at max.
Contrast, Brightness and Sound controls ?
CIRCUITS TO BE CHECKED:
»
Tuner.
»
PIF.
»
Automatic Gain Control.
»
(5V), (32V) Power Source.
CIRCUITS TO BE CHECKED:
»
Sound Detector Circuit.
»
Sound Switch and Att.
Control.
»
Audio Output Circuit.
Does signal appear at pins
(2) and (5) of IC302 ?
Is there audio signal at pins (3)
and (5) of SC2300?
(NICAM/IGR unit socket)
Check TV sound.
Check Speaker.
Does noise or
signal appear at
pin (23) and (24)
of IC801 ?
Check IC302 and
peripheral circuit.
Check IC401.
Check NICAM/
IGR unit, tuner
and its peripheral
circuit.
*NOTE:
NICAM/IGR for model
SX51LF8 Only IGR for
model SX51LF7 Only.
Содержание SX51LF7
Страница 31: ...31 SX51LF7 SX51LF8 1 2 3 4 5 6 7 8 9 10 A B C D E F G H I J CHASSIS LAYOUT ...
Страница 38: ...42 SX51LF7 SX51LF8 1 2 3 4 5 6 7 8 9 10 A B C D E F G H I J SCHEMATIC DIAGRAM MODEL SX51LF7 CRT Unit ...
Страница 39: ...43 SX51LF7 SX51LF8 1 2 3 4 5 6 7 8 9 10 A B C D E F G H I J SCHEMATIC DIAGRAM MODEL SX51LF8 CRT Unit ...
Страница 43: ...50 SX51LF7 SX51LF8 1 2 3 4 5 6 7 8 9 10 A B C D E F G H I J BLOCK DIAGRAM 2 3 CRT IGR BLOCK SX51LF7 ...
Страница 44: ...51 SX51LF7 SX51LF8 1 2 3 4 5 6 7 8 9 10 A B C D E F G H I J BLOCK DIAGRAM 3 3 NICAM IGR BLOCK SX51LF8 ...
