Service Manuals, User Guides, Schematic Diagrams or docs for : ONKYO Audio 575ham-hiss-jp

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575ham-hiss-jp


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                                                    2-1 NISSHIN-CHO,NEYAGAWA-SHI,OSAKA 572-8540,JAPAN
                                                                      Techinical InformationGroup,Service Dept.
                                                                       SERVICE BULLETIN
                                                                           NO:99010-r1

LAST REVISED :00/03/02
DATE : 99/09/03                                           MODELS : TX-DS575

SUBJECT : Noise is heard from "VOLUME MIN" to "VOLUME 1".

Symptom:
When MASTER VOLUME is raised from "VOLUME MIN" to "VOLUME 1", the noise is heard from front
speaker, center speaker, and rear speaker.

Cause:
The gain of the following circuit from master volume is higher, and the residual noise in the amplifier was larger.

Procedure for service:
Please improve the complaint goods without "A" added at the end of serial numbers as follows.
a. The gain of all channels is reduced.
b. Noise decrease
c. Distortion rate improvement
Because the distortion rate worsens by reducing the gain, please do measures of item C.
If the volume position is raised about 30 degrees, the noise becomes as well as before measures when measures
are executed.
The following service improvement ideas have the effect of the improvement of about 7~9dB.

Circuit No.               Before                After                 Parts No.            Remarks
a. Gain reduce (NAVD-6566)

R3183,R3283               39kohm                18kohm                417341834            Front L/R
R3184,R3284               47kohm                10kohm                417341034            Front L/R
R3384,R3484,R3584         22kohm                6.8kohm               417346824            Center,Surround
R3683                     330ohm                820ohm                417348214            Sub-woofer
b. Noise decrease (NAVD-6566)

Q3180,Q3181,Q3281           NJM4558L            NJM4580L-D            22240312             Front L/R
C3183,C3185,C3283           27pF                220pF                 345022214            >100KHz
C3285,C3383,C3483
C3583
c. Distortion rate improvement

R3199(NAVD-6566)       100kohm                  220kohm               417342244            Additional
J231(NAVD-6566) ( 1)
                         *
                       J231                     10kohm                417341034
R7089(NADIS-6576) ( 2) 220ohm
                             *                  10kohm                433121034R1
NOTE :
         *   1 and
                     *   2 are same mofdification. Please modify
                                                                   *1 or *2.
KIT NO. : 0T0058



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