I've got 3 readings at the transistor Q1205, the center leg 13.53 and
the 2 other legs 6.79 and 6.21 respectively. I think this is wrong,
the schematic shows the "base" at 6.5v?



"Mark D. Zacharias" wrote in message ...
Well, you need to check the standby voltages on the digital board. Q1205
appears to be a 5 volt source.

Mark Z.


"ampapa" wrote in message
m...
The "standby transformer" is that T902 on the schematic?

I've got 13.5V on the header that leads to the "Digital" board.



"Mark D. Zacharias" wrote in message
...
Measure from point 12V with respect to ground. I suspect your standby
transformer is bad.

Mark Z.


"ampapa" wrote in message
om...
No click when I push the power button and I do have my voltmeter set
to A/C.

By looking at the schematic am I correct that the transformer should
be seeing appx. 110v? or should I be looking for some other voltage
being delivered to the transformer?

Also, in order for the A/C board to "enable" the turn-on relay by the
on/off switch then I should be seeing voltage coming back from the
"Digital" board correct? I see the header that leads to the "Digital"
board has 4 legs, GND, 12V, P_OFF and P.RY. Are these designations
specific to the industry as to what they represent?


Thanks for the help,



"Mark D. Zacharias" wrote in message
...
If all the fuses are OK, then the power transformer probably isn't
getting
voltage from the turn-on relay. Does it click when you press the Power
button? CNV902 gets no AC voltage to speak of til this relay fires. (I
assume your voltmeter is set to measure AC voltage)

Mark Z.


"ampapa" wrote in message
om...
Sorry if this is a double post.

Mark, are you saying there might be a fuse literaly underneath a
circuit board and not necessarily hidden from view by a circuit
board?
I checked about 5 or 6 fuses in this thing and all checked fine.

My biggest problem is that when I read the schematic I can't tell if
the transformer is supposed to be getting 110v from the A/C board on
CNV902? If it is then I can trace it from there. That's my real
dilema.

The schematic can be found here
(http://www.eserviceinfo.com/index.php?what=search2).

Thanks,


"Mark D. Zacharias" wrote in message
...
These models often have fuses sort of hidden under a circuit board
attached
to the transformer. If these fuses are blown you probably have a
blown
amp
channel. Sometimes just the output transistors for a given channel
are
bad,
sometimes there are other small parts bad. Occasionally a circuit
mod
is
required to lessen the bias at startup.

Mark Z.


"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.