How to do a master reset on sony receiver STR-AV570?
Jay
protection mode on startup, but after a few times switching it on/off will
usually come on fully (both relays click) and continue to work properly.
Now the fun part: when it has been turned off, after a random amount of
time, a few seconds or many hours later it will try to turn itself back on,
with the receiver clicking away and speakers thumping if speaker selector
switch is engaged. First time it happened I was in bed at 4 a.m.and didnt
know what was going on!
I bought it knowing this was the problem, so I can't say when or what caused
it. Have read that the PCB ground points on models of this era go bad over
time so I've sanded all metal points shiny with scotch brite. Now however
it just goes into protection mode on startup each time. Before, when it was
off and trying to turn itself on, placing a hand underneath and
lifting/flexing it would stop it from cycling and seemed to cure the
protection mode fault. This makes me suspect a bad connection and is the
only thing I have looked for so far. However, I cant find any evidence of
broken traces or bad solder joints on any boards.
Was hoping perhaps a master reset would do the trick. If anybody could tell
me how, thanks!
Jay
CLSNOWYOWL
Sanding the solder points does not help the connections, except to remove the
flux after the soldering has been done. Sounds like you need to go through and
retouch all of the circuit board to see if that helps.
You have to be very gentle when doing this, as many parts are extremely
delicate and can get damaged during soldering. If uunsure about it, have a
person more knowledgeable perform the repair.
Also look for ribbon cables that are damaged or have frayed pins on them.
Sometimes, the ribbon cables which interconnect one board to another come apart
and have to be replaced.
Tony Marsillo
the chassis, I think Sony relied on the screws to complete the ground
connections in the receiver.
--
Tony Marsillo
Nutmeg Repair
amar...@yahoo.com
Jay <j...@asapnet.net> wrote in message
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Jay
gentle flexing I can get both relays to click . Will have to find that.
Also thinking of making a common chassis ground instead of soldering the
grounding screws in. Would still like to know how to do that master reset
though. Anyone?
Jay
Tony Marsillo <amar...@yahoo.com> wrote in message
news:8vrs04$mg8$1...@taliesin.netcom.net.uk...
Sofie
> Thanks for the reply, guys. There's a short somewhere on the main PCB,
with
> gentle flexing I can get both relays to click .
---
Jay:
Probably NOT a "short" but more than likely a cracked or bad solder
joint.........or even a cracked circuit trace or other type of "open"
circuit.
You shouldn't have to resort to modifying the chassis grounding......as long
as the screws are tight and the connections are clean, that should be
sufficient..........concentrate istead on solving the circuit board and
intermittent solder connection problem and your reciever should be back in
working order soon.
Best Regards,
Dan Sofie
Electronics Supply & Repair
==============================================
Jay
joint/trace that I know must be there, but can't find it yet under a bright
light and magnifying glass. Never did like resoldering things at random, oh
well. When I do find the culprit I'll post a note even though this isn't
one of those perplexing dramatic repairs. Perhaps if it's problem was that
it occasionally burst into flames...
Jay
Sofie <so...@olypen.com> wrote in message
news:NxLU5.58248$DG3.1...@news2.giganews.com...
>
> Jay <j...@asapnet.net> wrote in message
> news:t26rrdn...@corp.supernews.com...
> > Thanks for the reply, guys. There's a short somewhere on the main PCB,
> with
> > gentle flexing I can get both relays to click .
> --------------------------------------------------------------------------
--
> ---
> Jay:
> Probably NOT a "short" but more than likely a cracked or bad solder
> joint.........or even a cracked circuit trace or other type of "open"
> circuit.
> You shouldn't have to resort to modifying the chassis grounding......as
long
> as the screws are tight and the connections are clean, that should be
> sufficient..........concentrate istead on solving the circuit board and
> intermittent solder connection problem and your reciever should be back in
> working order soon.
> Best Regards,
> Dan Sofie
> Electronics Supply & Repair
> ==============================================
> >
> >
Mark D. Zacharias
ground. I had one recently where a broken solder (GND) connection at the
phono jacks intermittently caused the unit to shut down. Also make sure the
screw which secures the phono jacks to the rear panel is tight. You may
notice it is somewhat different than the other screws used in the unit.
Mark Z.
Jay <j...@asapnet.net> wrote in message
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Jay
screws to the chassis. Don't recall seeing that method of grounding used
before. Is it just a Sony thing?
Jay
Mark D. Zacharias <mzach...@kscable.com> wrote in message
news:ML5V5.315$EA6.2...@typhoon.kc.rr.com...
