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Symptom
Cause and Remedy
C) SURROUND MUTE Trasistor's out and inferior.
| Q (411, 412, 413L/R )
1. 44-Com Surround Mute Control PORT check. | I.C Pin No. ( 48 )
Sounds from Speaker
when Headphone's connected.
Bass Control Failure.
Treble Control Failure.
AMP Sound Dead.
1."L/R" channel dead.
2. "LEFT" channel dead.
3. "RIGHT" channel dead.
A) Headphone mute TR out.
B) HEADPHONE JACK connection inferior.
C) u-Com IC inferior.
1.
"-Com H/P IN/OUT control "PORT" check.
A) Bass volume check.
1. Resister/Capacitor correction figure check.
2. BASS VR's property inferior.
B) TONE AMP IC check.
1. Signal IN/OUT terminal check.
2. IC voltage check. (+6.8)V, (6.8)V
C) TONE VOLUME IC check.
1. Signal IN/OUT terminal.
2. 1C Voltage check. (+ )V,(-
)V
3. IC Control data check.
A) Treble volume check.
1. Resister/Capacitor correction figure check.
2. Treble VR's property inferior.
B) TONE AMP IC check.
1. Signal IN/OUT terminal.
2. IC voltage check. (+ )V, (- )V
C) TONE VOLUME IC check.
1. Signal IN/OUT terminal.
2. IC voltage check. (+ )V, (- )V
3. IC control data check.
A) Signal Mute TR's inferior.
B) Connector disconnection & disjunction.
1. Changer or close insertion of the connector.
C) Speaker wire's disjunction.
1. Close insertion of the speaker wire.
D) Signal switching IC check.
1. IC voltage check. (+15 )V, (-15 )V
2. Switching IC control data check.
3. Switching IC signal IN/OUT check.
20
JACK ( 301 )
C ( 454L/R, 455L/R )
IC ( 406 )
1.C Pin No. (17, 26 )
1.C Pin No, ( 19, 24 )
1.C Pin No. (5, 30 )
1.C Pin No. ( 39, 40, 41 )
C ( 456L/R )
IC ( 406 )
1.C Pin No. (18, 25 )
I.C Pin No. (39, 40, 41 )
Q (405, 408, 411, 414)
CNT
( 403 )
1.C (401, 403 )
1.C Pin No.( 1, 28 )
1.C Pin No.{ 13, 15, 16)
1.C Pin No.( 12, 17 )
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