These sets can be very difficult to reliably and safely troubleshoot and
service. The proper training, service experience, product training, and a
solid background in electronics theory would be an asset to do service on
these sets.
In going by the way you are presenting your questions, I would suggest you
give the unit out to an authorized service centre to have an estimate done
for you.
When servicing these sets, the main procedure is to verify all the voltages
from the power supply. If there are some missing, then you must start to
troubleshoot the unit from the point of loss, and go on from there. It is
possible that there is a short somewhere, and has damaged the power supply,
or some other components failed, and thus caused other types of damage.
It is very common in these receivers that the output devices and their
respective driver devices, become shorted. In this event, the power supply,
and a number of other support components may be damaged. You will have to
determine this.
--
Jerry G.
==========================
"ampapa" wrote in message
om...
First off I'd like to say, "Hello." to the group. I hope I can gain
some knowledge from the group's collective input.
I have a Sony STR-DE635 stereo receiver that will not turn on and I
would like to investigate into maybe seeing if I can repair it. I
found a set of schematics on this site which I believe will
definitely help.(
http://www.eserviceinfo.com/index.php?what=search2)
I'm guessing but I think that the problem is related to the power
supply? On p.13 of this .PDF manual it has an A/C and D/C schematic,
this receiver has a seperate board for each. I probed the A/C board
and found that it has voltage out to the "Digital" board of a little
over 12 volts but when I try to test the pins on CNV902 I thought I
should be getting appx. 110 A/C but only get appx. 2? CNV902 is a
simple 2 wire connector leading directly to a transformer.
My common sense is telling me that why would I need a transformaer
the size of Kansas for only 2 volts A/C? So, I'm guessing this might
have something to do with it? I could be in left field due to my lack
of knowledge and inexperience, that's why I'm hoping you guy's/girl's
can shed some light.
Thanks for any suggestions or hints you can provide.