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Symptom
Power On Failure.
1. FLT does not light up.
2. ST-BY LED does not light up.
Fuse Disconnection.
(Power On)
Key Disorder.
Power Off in 2~3 sec.
after Power on.
TROUBLESHOOTING
A) AC-Cord check.
B) Power Trans (Main/ST-BY) check.
C) Fuse''s disconnection check.
D) Connector's disconnection or disjunction.
Change or close insertion of the connector.
E) inferior Stany-By switch.
F)
u-COM LC & Resonator check.
1. u-COM IC B+( 5 )V check.
2.
-COM clock pulse check.
A) Inferior transformer.
B) AMP drive transistor out. ( POWER TR )
C) AMP drive I.C out. ( POWER IC )
D) Regulator !.C voltage check.
1. B+ (15 )V, B-(15)V
A) Key's being pushed check.
B) Key signal input components inferior.
C) Key data check.
D) #-COM1.C or Resonator inferior.
1.
4-COM IC B+( 5 )V check.
2.
-COM clock pulse check.
A) Drive I.C out. ( POWER IC )
1. Power drive voltage check. (+6 V,-
V)
2. Signal IN/OUT check.
B) Drive transistor out. ( POWER TR )
C) Protection circuit check.
1. Output DC check.
2.
4-COM 1.C protection terminal check.
D) Posistor's connector disconnection.
E) Connector's disconnection or disjuction.
F) SLEEP MODE cancellation.
F(712)
CNT ( 302, 303 )
SW (307)
1.C Pin No. ( 44 )
X-TAL ( 301 )
Q ( 214L/R/C/SL/SR )
IC ( 101/102 )
SW ( 301 )
D (310),
R (328)
I.C Pin No. (70)
I.C Pin No. (301)
1.C Pin No. ( 44 )
X-TAL (301 )
1.C (710)
R (123)
1.C Pin No.{ 12)
CNT ( 301)
Bump Sound.
A) POWER MUTE Transistor's out and inferior.
Q ( 405, 406, 407L/R )
( During input-select switch's change. )
1. u-Com Front Mute Control PORT check.
1.C Pin No. ( 47 )
B) CENTER MUTE Transistor's out and inferior.
Q ( 408, 409, 410 )
1. u4-Com Center Mute Control PORT check.
1.C Pin No. (50)
19
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