Onkyo -575Ham-Hiss-Jp 电路图.pdf

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1、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 : 99/09/03MODELS : TX-DS575 SUBJECT : Noise is heard from VOLUME MIN to VOLUME 1. Symptom: When MASTER VOLUME is raised from VOLUME MIN to VOLUME 1, th

2、e 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

3、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

4、executed. The following service improvement ideas have the effect of the improvement of about 79dB. Circuit No.BeforeAfterParts No.Remarks a. Gain reduce (NAVD-6566) R3183,R328339kohm18kohm417341834Front L/R R3184,R328447kohm10kohm417341034Front L/R R3384,R3484,R358422kohm6.8kohm417346824Center,Surr

5、ound R3683 330ohm820ohm417348214Sub-woofer b. Noise decrease (NAVD-6566) Q3180,Q3181,Q3281NJM4558LNJM4580L-D22240312Front L/R Additional C3183,C3185,C3283 C3285,C3383,C3483 C3583 27pF220pF345022214100KHz c. Distortion rate improvement R3199(NAVD-6566)100kohm220kohm417342244 R7089(NADIS-6576) (*2) 220ohm10kohm433121034R1 J231(NAVD-6566) (*1)J23110kohm417341034 NOTE : *1 and *2 are same mofdification. Please modify *1 or *2. KIT NO. : 0T0058 RadioFans.CN 收音机爱 好者资料库