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From: Mark Zacharias on 25 Dec 2009 07:30
"circuit" <circuit(a)123456.tv> wrote in message news:hh0qm6$45g$1(a)aioe.org...
> Yea, if I remember they are copper coated - several are on the perimiter
> of the board, but some are centralized on the board.
>
>
> "lagman" <dan.hoffard(a)googlemail.com> wrote in message
> news:a046801a-20f6-4e56-8f2f-2d6c221388c7(a)r24g2000yqd.googlegroups.com...
> Thanks for the info. Where would the ground screws be located? I do
> not have a schematic. Should I just open it up and tighten all the
> phillips screws?
>
> Thanks,
> Dan
>
>
>
> On Dec 24, 3:22 pm, "circuit" <circ...(a)123456.tv> wrote:
>> All the STR-DE series have a common problem with the ground screws on the
>> main CBA being too loose and not properly grounding the board. Use a
>> Philips
>> screwdriver to tighten all of them real good, and see if the problem goes
>> away.
>>
>> "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>>
>> news:e97926bd-bd6c-4353-8c09-fdc8a1674d86(a)e27g2000yqd.googlegroups.com...
>>
>> >I have a STR-DE698 7.1ch receiver that started turning itself off
>> > recently. I suspected heat as the cause, so I moved it out of the
>> > enclosed cabinet and into an open one. I also set it on top of a
>> > laptop cooler to dissipate any excess heat. The unit still turns
>> > itself off after running for a half hour or so. I do not believe heat
>> > is the cause, since it is cool to the touch when it shuts down.
>>
>> > Anyone have any ideas?
>>
>> > Thanks,
>> > Dan
>


The above advice applies to older (Dolby surround types, for example) models
only. Sony's haven't had this problem for going on 20 years. Modern models
more often have problems with driver IC's - STK350-230 and the like. Could
also be bad solder connections.

Mark Z.

From: lagman on 26 Dec 2009 10:45
On Dec 24, 4:41 pm, "circuit" <circ...(a)123456.tv> wrote:
> Yea, if I remember they are copper coated - several are on the perimiter of
> the board, but some are centralized on the board.
>
> "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> news:a046801a-20f6-4e56-8f2f-2d6c221388c7(a)r24g2000yqd.googlegroups.com...
> Thanks for the info.  Where would the ground screws be located?  I do
> not have a schematic.  Should I just open it up and tighten all the
> phillips screws?
>
> Thanks,
> Dan
>
> On Dec 24, 3:22 pm, "circuit" <circ...(a)123456.tv> wrote:
>
> > All the STR-DE series have a common problem with the ground screws on the
> > main CBA being too loose and not properly grounding the board. Use a
> > Philips
> > screwdriver to tighten all of them real good, and see if the problem goes
> > away.
>
> > "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> >news:e97926bd-bd6c-4353-8c09-fdc8a1674d86(a)e27g2000yqd.googlegroups.com....
>
> > >I have a STR-DE698 7.1ch receiver that started turning itself off
> > > recently. I suspected heat as the cause, so I moved it out of the
> > > enclosed cabinet and into an open one. I also set it on top of a
> > > laptop cooler to dissipate any excess heat. The unit still turns
> > > itself off after running for a half hour or so. I do not believe heat
> > > is the cause, since it is cool to the touch when it shuts down.
>
> > > Anyone have any ideas?
>
> > > Thanks,
> > > Dan

I just wanted to follow up on this thread in case anyone else has a
similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still
shutting itself off after about a half hour of use. I removed the
smaller PCB located right where the power comes in, and noticed the
ground screw hole had become corroded/filled with gunk. I cleaned it
out, and added a wire ground from the board to the chassis, plugged
everything in, and it has been running for about 12 hours now with no
problems. It appears to have been a grounding problem after all.
Curcuit: Thanks for suggesting I check the ground screws! It is hard
to believe Sony relies on this method of grounding as opposed to a
direct connection to the chassis (I've always considered Sony a step
up from Technics, Sharp, etc).

Thanks,
Dan
From: N_Cook on 26 Dec 2009 11:55
lagman <dan.hoffard(a)googlemail.com> wrote in message
news:8538612b-b1d6-4725-965b-c67d4fd73c92(a)e37g2000yqn.googlegroups.com...
On Dec 24, 4:41 pm, "circuit" <circ...(a)123456.tv> wrote:
> Yea, if I remember they are copper coated - several are on the perimiter
of
> the board, but some are centralized on the board.
>
> "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> news:a046801a-20f6-4e56-8f2f-2d6c221388c7(a)r24g2000yqd.googlegroups.com...
> Thanks for the info. Where would the ground screws be located? I do
> not have a schematic. Should I just open it up and tighten all the
> phillips screws?
>
> Thanks,
> Dan
>
> On Dec 24, 3:22 pm, "circuit" <circ...(a)123456.tv> wrote:
>
> > All the STR-DE series have a common problem with the ground screws on
the
> > main CBA being too loose and not properly grounding the board. Use a
> > Philips
> > screwdriver to tighten all of them real good, and see if the problem
goes
> > away.
>
> > "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> >news:e97926bd-bd6c-4353-8c09-fdc8a1674d86(a)e27g2000yqd.googlegroups.com...
>
> > >I have a STR-DE698 7.1ch receiver that started turning itself off
> > > recently. I suspected heat as the cause, so I moved it out of the
> > > enclosed cabinet and into an open one. I also set it on top of a
> > > laptop cooler to dissipate any excess heat. The unit still turns
> > > itself off after running for a half hour or so. I do not believe heat
> > > is the cause, since it is cool to the touch when it shuts down.
>
> > > Anyone have any ideas?
>
> > > Thanks,
> > > Dan

I just wanted to follow up on this thread in case anyone else has a
similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still
shutting itself off after about a half hour of use. I removed the
smaller PCB located right where the power comes in, and noticed the
ground screw hole had become corroded/filled with gunk. I cleaned it
out, and added a wire ground from the board to the chassis, plugged
everything in, and it has been running for about 12 hours now with no
problems. It appears to have been a grounding problem after all.
Curcuit: Thanks for suggesting I check the ground screws! It is hard
to believe Sony relies on this method of grounding as opposed to a
direct connection to the chassis (I've always considered Sony a step
up from Technics, Sharp, etc).

Thanks,
Dan


what was the gunk from ? nearby electrolytic that needs changing?






From: hr(bob) hofmann on 26 Dec 2009 15:08
On Dec 26, 10:55 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> lagman <dan.hoff...(a)googlemail.com> wrote in message
>
> news:8538612b-b1d6-4725-965b-c67d4fd73c92(a)e37g2000yqn.googlegroups.com...
> On Dec 24, 4:41 pm, "circuit" <circ...(a)123456.tv> wrote:
>
>
>
>
>
> > Yea, if I remember they are copper coated - several are on the perimiter
> of
> > the board, but some are centralized on the board.
>
> > "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> >news:a046801a-20f6-4e56-8f2f-2d6c221388c7(a)r24g2000yqd.googlegroups.com....
> > Thanks for the info. Where would the ground screws be located? I do
> > not have a schematic. Should I just open it up and tighten all the
> > phillips screws?
>
> > Thanks,
> > Dan
>
> > On Dec 24, 3:22 pm, "circuit" <circ...(a)123456.tv> wrote:
>
> > > All the STR-DE series have a common problem with the ground screws on
> the
> > > main CBA being too loose and not properly grounding the board. Use a
> > > Philips
> > > screwdriver to tighten all of them real good, and see if the problem
> goes
> > > away.
>
> > > "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> > >news:e97926bd-bd6c-4353-8c09-fdc8a1674d86(a)e27g2000yqd.googlegroups.com....
>
> > > >I have a STR-DE698 7.1ch receiver that started turning itself off
> > > > recently. I suspected heat as the cause, so I moved it out of the
> > > > enclosed cabinet and into an open one. I also set it on top of a
> > > > laptop cooler to dissipate any excess heat. The unit still turns
> > > > itself off after running for a half hour or so. I do not believe heat
> > > > is the cause, since it is cool to the touch when it shuts down.
>
> > > > Anyone have any ideas?
>
> > > > Thanks,
> > > > Dan
>
> I just wanted to follow up on this thread in case anyone else has a
> similar problem with Sony STR series receivers.
>
> I had tightened all of the ground screws but the unit was still
> shutting itself off after about a half hour of use.  I removed the
> smaller PCB located right where the power comes in, and noticed the
> ground screw hole had become corroded/filled with gunk.  I cleaned it
> out, and added a wire ground from the board to the chassis, plugged
> everything in, and it has been running for about 12 hours now with no
> problems.  It appears to have been a grounding problem after all.
> Curcuit:  Thanks for suggesting I check the ground screws!  It is hard
> to believe Sony relies on this method of grounding as opposed to a
> direct connection to the chassis (I've always considered Sony a step
> up from Technics, Sharp, etc).
>
> Thanks,
> Dan
>
> what was the gunk from ? nearby electrolytic that needs changing?- Hide quoted text -
>
> - Show quoted text -

It is scary that a simple ground connection is made thru just one
screw and not a wire. Usually, if it is just a screw, the screw
presses the board against a good grounded piece of metal, and does not
rely on the actual screw to do the grounding. Anything that is
cheaper seems to be the way that everyone, including "reputable"
manufacturers is going.
From: Klaatu on 26 Dec 2009 17:02

"lagman" <dan.hoffard(a)googlemail.com> wrote in message
news:8538612b-b1d6-4725-965b-c67d4fd73c92(a)e37g2000yqn.googlegroups.com...
On Dec 24, 4:41 pm, "circuit" <circ...(a)123456.tv> wrote:
> Yea, if I remember they are copper coated - several are on the perimiter
> of
> the board, but some are centralized on the board.
>
> "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> news:a046801a-20f6-4e56-8f2f-2d6c221388c7(a)r24g2000yqd.googlegroups.com...
> Thanks for the info. Where would the ground screws be located? I do
> not have a schematic. Should I just open it up and tighten all the
> phillips screws?
>
> Thanks,
> Dan
>
> On Dec 24, 3:22 pm, "circuit" <circ...(a)123456.tv> wrote:
>
> > All the STR-DE series have a common problem with the ground screws on
> > the
> > main CBA being too loose and not properly grounding the board. Use a
> > Philips
> > screwdriver to tighten all of them real good, and see if the problem
> > goes
> > away.
>
> > "lagman" <dan.hoff...(a)googlemail.com> wrote in message
>
> >news:e97926bd-bd6c-4353-8c09-fdc8a1674d86(a)e27g2000yqd.googlegroups.com...
>
> > >I have a STR-DE698 7.1ch receiver that started turning itself off
> > > recently. I suspected heat as the cause, so I moved it out of the
> > > enclosed cabinet and into an open one. I also set it on top of a
> > > laptop cooler to dissipate any excess heat. The unit still turns
> > > itself off after running for a half hour or so. I do not believe heat
> > > is the cause, since it is cool to the touch when it shuts down.
>
> > > Anyone have any ideas?
>
> > > Thanks,
> > > Dan

I just wanted to follow up on this thread in case anyone else has a
similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still
shutting itself off after about a half hour of use. I removed the
smaller PCB located right where the power comes in, and noticed the
ground screw hole had become corroded/filled with gunk. I cleaned it
out, and added a wire ground from the board to the chassis, plugged
everything in, and it has been running for about 12 hours now with no
problems. It appears to have been a grounding problem after all.
Curcuit: Thanks for suggesting I check the ground screws! It is hard
to believe Sony relies on this method of grounding as opposed to a
direct connection to the chassis (I've always considered Sony a step
up from Technics, Sharp, etc).

Thanks,
Dan

______________

Sony is a four letter word.

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