Ref No.
Power On Failure A) AC-Cord check.
1. FLT does not light up. B) Power Trans (Main/ST-BY) check.
2. ST-BY LED does not light up. C) Fuse's disconnection check. F300(STANDBY)
D) Connector's disconnection or disjunction.
Change or close insertion of the connector. CP704,FPC100(FRONT)
E) Inferior ST-By switch. SW(700)(FRONT)
F) VFD Driver I.C & Resonator check. I.C701 SC16315(FORNT)
1. VFD Driver I.C VCC(+3.3)V check. I.C701 Pin No13(FRONT)
2. VFD Driver clock pulse check. I.C701 Pin No5(FRONT)
Fuse Disconnection. A) Inferior transformer.
(Power On) B) AMP drive TR out. (POWER TR) Q206( FL, FR, C, SL, SR )(AMP)
C) AMP drive TR out. ( POWER TR ) Q205 ( FL, FR, C, SL, SR ) (AMP)
D) voltage check.
1. B+ ( 47 )V, B- ( 47 ) V
Key Disorder. A) Key's being pushed check.
B) Key signal input components inferior.
C) Key PORT check. I.C119 Pin No. (91,92 )(DMAIN)
D) μ-COM I.C inferior.
1. μ-COM IC VCC +3.3V check.
I.C119 Pin No. ( 16,62 )(DMAIN)
Power Off in 2~3 sec. A) Regulator I.C out. I.C 300 (IL1117S_3.3V)(STANDBY)
after Power On. 1. Signal IN/OUT check.
B) Drive transistor out. ( POWER TR ) Q205 ( FL, FR, C, SL, SR ) (AMP)
Q206( FL, FR, C, SL, SR )(AMP)
C) Protection circuit check.
1. Output DC check.
2. μ-COM I.C protection terminal check.
u-COM Pin No. ( 85 )(DMAIN)
D) Connector's disconnection or disjunction CP (111)(MAIN)
E) SLEEP MODE cancellation.
Bump Sound A) FRONT Mute transistor's out and inferior. Q (105 ) (MAIN)
(During input-select switch's change.)
μ-Com front mute control PORT check.
I.C119 Pin No. ( 2 )(DMAIN)
B) CENTER Mute transistor's out and inferior. Q ( 107 )(MAIN)
μ-Com center mute control PORT check.
I.C119 Pin No. ( 97 )(DMAIN)
D) SURROUND Mute transistor's out and inferior.
Q ( 109 )(MAIN)
μ-Com surround mute control PORT check.
I.C119 Pin No. ( 1 )(DMAIN)
AVR70/700/70C TROUBLESHOOTING
Cause and RemedySymptom
To check software version: Switch AVR 70 into Standby (LED lights amber),
Keep "Standby" and "Preset Down" buttons pressed at the same time until
display shows software version (such as "70 E0.65").
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