TROUBLE SHOOTING TABLE (Continued) !"#$%&'()
Circuits to be checked:
? Sound control circuit.NO NORMAL SOUND
? Sound out circuit.
? SIF circuit.
? S-convertor.
S-
Is audio output terminal J451
NoYesJ451
normal.
Check TV sound.Is there audio signal at pins (52) and IC451(52) (54)
(54) of IC451?
NoYes
Change the sound system.Is there audio
Check IC451 SC301(14)
Is sound normal?signal at pins (14) IC451 (16)
and its
and (16) of SC301
NoYesperipheral (NICAM unit
circuit.(NICAM
socket)?
)
Are there NoYes
IC451
audio signal at (62) (64)
pins (62) and
(64) of IC451?Check NICAM NICAM
unit.
31NoYes
Set the sound Check IC1300,
Is there audio signal IC1300, IC1300 IC1301
system in IC1301 and its at pin (9) of IC1300 IC1301(9)
Check position.peripheral circuit. and IC1301?No
NICAM unit, If problem,
tuner and its check pins (12), YesNICAM
TU201
peripheral (13) and (14) of
(12), (13), (14)
circuit.TU201 and their Check Q1304, Does 5V appear at
peripheral Q1304, Q1305IC1300 IC1301
Q1305 and pin (10) of IC1300
circuits.NoIC1300, IC1301(10)5V
peripheral circuit of and IC1301?
IC1300, IC1301.
Yes
Check IC451
and its IC451
peripheral Check IC1300, IC1300,
circuit.IC1301 and speaker IC1301
connector (SS).(SS)
29A-FX8 29A-FX5
E31C31 |
ACEC
SHARP
