Need help with Sony DE835 Blows L. Ch. Outputs

M

MikeZOD

Guest
Have checked all components in left channel , seem to be good
Replace outputs and driver IC . all 180 ohm's ok.

anyone familiar with this unit , I have to be missing something

apply power volume @ Min. for about 20, 30 seconds and blows outputs.


Mike ZOD
 
From Sony, with bad grammar corrected:

Last Update
2/12/2002
Model STRDE835
Subject
BIAS CKT COUNTERMEASURE FOR OUTPUT FAILURE AT COLD PWR UP



SYMPTOMS

Additional components which are not referenced in the service manual are
sometimes placed in the output section bias circuit. A 5.1K resistor, is
placed in parallel with R722 (22K) and R721 (2.7K) and R772 (22K) and R771
(2.7K) in the rear amp board. A jumper wire is also placed across R720
(10K) and R770 (10K) on the affected boards. Similarly, the Front and Center
channels have the 5.1K resistor and jumper in circuit.

*******************************************

Mark Z.

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


<MikeZOD> wrote in message
news:2oe020d9s06tctogiveu62b5pe8diak1m6@4ax.com...
Have checked all components in left channel , seem to be good
Replace outputs and driver IC . all 180 ohm's ok.

anyone familiar with this unit , I have to be missing something

apply power volume @ Min. for about 20, 30 seconds and blows outputs.


Mike ZOD
Click to expand...
 
Thanks Mark,



appreciate the response will try today if I get a
chance!

again Thank You!

On Tue, 3 Feb 2004 20:51:43 -0600, "Mark D. Zacharias"
<mzacharias@yis.us> wrote:

From Sony, with bad grammar corrected:

Last Update
2/12/2002
Model STRDE835
Subject
BIAS CKT COUNTERMEASURE FOR OUTPUT FAILURE AT COLD PWR UP



SYMPTOMS

Additional components which are not referenced in the service manual are
sometimes placed in the output section bias circuit. A 5.1K resistor, is
placed in parallel with R722 (22K) and R721 (2.7K) and R772 (22K) and R771
(2.7K) in the rear amp board. A jumper wire is also placed across R720
(10K) and R770 (10K) on the affected boards. Similarly, the Front and Center
channels have the 5.1K resistor and jumper in circuit.

*******************************************

Mark Z.
Click to expand...
 
Mark,


Thank You very much for this info, it worked
just fine! I really apriciate the response to my request and I hope
that in the future I can be of help to you, or someone else in the
same fashion!

Again Thank You!

MikeZOD

On Tue, 3 Feb 2004 20:51:43 -0600, "Mark D. Zacharias"
<mzacharias@yis.us> wrote:

From Sony, with bad grammar corrected:

Last Update
2/12/2002
Model STRDE835
Subject
BIAS CKT COUNTERMEASURE FOR OUTPUT FAILURE AT COLD PWR UP



SYMPTOMS

Additional components which are not referenced in the service manual are
sometimes placed in the output section bias circuit. A 5.1K resistor, is
placed in parallel with R722 (22K) and R721 (2.7K) and R772 (22K) and R771
(2.7K) in the rear amp board. A jumper wire is also placed across R720
(10K) and R770 (10K) on the affected boards. Similarly, the Front and Center
channels have the 5.1K resistor and jumper in circuit.

*******************************************

Mark Z.
Click to expand...
 
Yahoo!

mz

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


<MikeZOD> wrote in message
news:cpk520hath81q9hrur5pphotrf8lhh2g0i@4ax.com...
Mark,


Thank You very much for this info, it worked
just fine! I really apriciate the response to my request and I hope
that in the future I can be of help to you, or someone else in the
same fashion!

Again Thank You!

MikeZOD

On Tue, 3 Feb 2004 20:51:43 -0600, "Mark D. Zacharias"
mzacharias@yis.us> wrote:

From Sony, with bad grammar corrected:

Last Update
2/12/2002
Model STRDE835
Subject
BIAS CKT COUNTERMEASURE FOR OUTPUT FAILURE AT COLD PWR UP



SYMPTOMS

Additional components which are not referenced in the service manual are
sometimes placed in the output section bias circuit. A 5.1K resistor, is
placed in parallel with R722 (22K) and R721 (2.7K) and R772 (22K) and
R771
(2.7K) in the rear amp board. A jumper wire is also placed across R720
(10K) and R770 (10K) on the affected boards. Similarly, the Front and
Center
channels have the 5.1K resistor and jumper in circuit.

*******************************************

Mark Z.
Click to expand...
 
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