I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

Regards,

Greg
Santa Fe, NM

Gregory Braun schrieb:

I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Not really a nice experience. :-/ Seems like a case for negative
feedback.

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

First, I hope you have soldering gear suitable for SMD and a loupe or
microscope - you're likely to need it. (Along with a scope and suitable
probes; a multimeter may be useful as well.) You can find a service
manual he
http://bama.sbc.edu/sony.htm
Once you've got that, check the +14V voltage first, there's a testpoint
at the back of the main circuit board. If it shows heavy ripple or is
way off spec, the buffering cap inside the DC/DC converter (22µ elect)
is quite likely to be dead - when replacing it, be sure to put, say,
100nF ceramic in parallel (the original cap is prone to early death
partly because this was left out during construction). (This voltage is
also used in the PLL lowpass filter so it's quite likely the receiver
would not be receiving much with it missing.) That is not to say that
all the other caps are still working fine (some like C69 can cause a
weakened DC/DC converter to be overloaded altogether when not in good
shape), be sure to check them all for leakage.
The mechanics:
Getting the back off still is easy, ditto for the front and the clipped
on part over the controls on the right-hand side. I'd then suggest to
unclip the microprocessor board first (careful not to damage the ribbon
cable connecting both boards). The ribbon cable is held by a connector
on the main board, which you need to unlock carefully (push up the upper
part) with a small screwdriver or such. Once the µP board is off, you
can remove the main circuit board from the frame after removing a screw
pretty much in the center (may be covered). Ah yes, the rod antenna will
have to be unsoldered as well, be sure not to mix up any of the wires
when reconnecting it afterwards. Then you can finally take the PCB off
and look at it closely. The DC/DC converter is under the shielding can
near the DC power socket.
Also see http://stephan.win31.de/sony7600.htm#7600_repair.

BTW, what's the cereal, err, serial number of your SW7600? (Mine's a bit
over 300,000, and I'm wondering whether they may have started at 300,001
instead of 1 for whatever reason. This would mean mine is a very early
sample, while otherwise it would be a late one.)

Stephan
--
Meine Andere Seite: http://stephan.win31.de/
PC#6: i440BX, 2xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer

That's really rotten.

Please leave negative feedback for the seller and make it harder for
him to pull this stunt again.

Steve



Gregory Braun wrote in message ...
I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

Regards,

Greg
Santa Fe, NM

Hello Stephan,
Thanks for the fast and insightfull response. You've really given me a
leg up on this. Yes, I have the SMD tools for this along with scope and
dmm. Just need to download the manual and have at it ... thanks again!

As you've been so helpful, if all else fails and I elect to scrap it, I
would like to send it to you for spare parts if you are interested.

Best Regards,
Greg Braun


Ser. #- 245101

Stephan Grossklass wrote:
Gregory Braun schrieb:


I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!


Not really a nice experience. :-/ Seems like a case for negative
feedback.


Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.


First, I hope you have soldering gear suitable for SMD and a loupe or
microscope - you're likely to need it. (Along with a scope and suitable
probes; a multimeter may be useful as well.) You can find a service
manual he
http://bama.sbc.edu/sony.htm
Once you've got that, check the +14V voltage first, there's a testpoint
at the back of the main circuit board. If it shows heavy ripple or is
way off spec, the buffering cap inside the DC/DC converter (22µ elect)
is quite likely to be dead - when replacing it, be sure to put, say,
100nF ceramic in parallel (the original cap is prone to early death
partly because this was left out during construction). (This voltage is
also used in the PLL lowpass filter so it's quite likely the receiver
would not be receiving much with it missing.) That is not to say that
all the other caps are still working fine (some like C69 can cause a
weakened DC/DC converter to be overloaded altogether when not in good
shape), be sure to check them all for leakage.
The mechanics:
Getting the back off still is easy, ditto for the front and the clipped
on part over the controls on the right-hand side. I'd then suggest to
unclip the microprocessor board first (careful not to damage the ribbon
cable connecting both boards). The ribbon cable is held by a connector
on the main board, which you need to unlock carefully (push up the upper
part) with a small screwdriver or such. Once the µP board is off, you
can remove the main circuit board from the frame after removing a screw
pretty much in the center (may be covered). Ah yes, the rod antenna will
have to be unsoldered as well, be sure not to mix up any of the wires
when reconnecting it afterwards. Then you can finally take the PCB off
and look at it closely. The DC/DC converter is under the shielding can
near the DC power socket.
Also see http://stephan.win31.de/sony7600.htm#7600_repair.

BTW, what's the cereal, err, serial number of your SW7600? (Mine's a bit
over 300,000, and I'm wondering whether they may have started at 300,001
instead of 1 for whatever reason. This would mean mine is a very early
sample, while otherwise it would be a late one.)

Stephan

You want to hear rotten? When I went to leave feedback he was no longer
a registered ebay-er. Though it's my only bad ebay experience we do
take our chances.

Greg

Steve wrote:

That's really rotten.

Please leave negative feedback for the seller and make it harder for
him to pull this stunt again.

Steve



Gregory Braun wrote in message ...

I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

Regards,

Greg
Santa Fe, NM

Gregory Braun wrote in news:h4ednRmw9-7SfvbcRVn-
:

I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

Regards,

Greg
Santa Fe, NM

Which e-bay user was this? Have you considered filling a claim with Ebay
or Paypal buyer protection (if appropriate)?

"Gregory Braun" wrote in message
...
Hello Stephan,
Thanks for the fast and insightfull response. You've really given me a
leg up on this. Yes, I have the SMD tools for this along with scope and
dmm. Just need to download the manual and have at it ... thanks again!

Greg,

I believe I have the service manual for the 7600 on a CD here somewhere. If
you are able to receive large e-mails, I may be able to send it to you.

I'd rather do a "real " sale than use Ebay...

In article , Gregory Braun
writes:

Subject: DEAD! Sony ICF-SW7600
From: Gregory Braun
Date: Tue, 12 Oct 2004 15:20:11 -0600

You want to hear rotten? When I went to leave feedback he was no longer
a registered ebay-er. Though it's my only bad ebay experience we do
take our chances.

Greg

Steve wrote:

That's really rotten.

Please leave negative feedback for the seller and make it harder for
him to pull this stunt again.

Steve



Gregory Braun wrote in message
...

I have a Sony ICF-SW7600 I bought on ebay. "Works Great" turns out to
be a joke and the seller changed his tune to "as-is" after the fact!!!

Anyone have schematics for this model? Sony provides an operators
manual and that's it. Repair options with Sony are limited to a $120.00
swap-out. I pretty much need to fix it or trash it. Any help would be
greatly appreciated. Unit powers up ok but the FM and MW bands are
completely dead and the sensitivity on LW might as well be.

Regards,

Greg
Santa Fe, NM

Thanks Brenda for the offer but I was able to download it.
Have a great day,

Greg

Brenda Ann Dyer wrote:
"Gregory Braun" wrote in message
...

Hello Stephan,
Thanks for the fast and insightfull response. You've really given me a
leg up on this. Yes, I have the SMD tools for this along with scope and
dmm. Just need to download the manual and have at it ... thanks again!


Greg,

I believe I have the service manual for the 7600 on a CD here somewhere. If
you are able to receive large e-mails, I may be able to send it to you.

Gregory Braun schrieb:

Hello Stephan,
Thanks for the fast and insightfull response. You've really given me a
leg up on this. Yes, I have the SMD tools for this along with scope and
dmm. Just need to download the manual and have at it ... thanks again!

Good luck. BTW, make sure it's not just the power amp that's dead (but I
guess the tuning LED never lights, correct?). And if you find any
leakage, cleaning the PCB may help. The worst case scenario probably is
having to change every single electrolytic, or at least most of them
(plus cleaning) - incidentally, this has been necessary for some people.
It has been suggested to crush the existing caps and solder to the
remaining legs to avoid PCB damage, a reasonable tip IMHO.

As you've been so helpful, if all else fails and I elect to scrap it, I
would like to send it to you for spare parts if you are interested.

I don't know... the shipping costs may turn out being as high as what
it's worth. Besides, it was enough of a hassle to get mine running (I do
not have the tools, vision, skills and all so I had to look out for
someone who could do the soldering for me) that I'm not all that keen on
getting another... If you should really fail to find the problem(s),
maybe you know someone who's really good at this stuff and happens to
know a good cause to dedicate the thing to.
On a side note, my SW7600G could use a front in good shape and a new
telescopic antenna, but I've yet to see one that was defective
electronically. (Well, at least that's a good sign WRT reliability,
isn't it?)

Ser. #- 245101

OK, then the SW7600 did reach more than 300,000 samples - something for
which the SW7600G needed much longer (I have yet to see any S/Ns over
300,000, 275xxx from May 2000 was the highest to date) and the 7600GR
may not even get close to.

Stephan
--
Meine Andere Seite: http://stephan.win31.de/
PC#6: i440BX, 2xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer