You sound like a tech. Where are you located and what kind of work do you
typically do?

Start the PS up slow and as soon as it starts switching note the frequency.
If it is below about 50kHz be careful. I have seen these sets with surge
damage with bad switching transformers and the tend to run slow from the
start. If it does it will blow the PS again in short order. Also note the
duty cycle of the transistors, which should be within a couple of percent of
50%. You should really get the training manual on this series of sets if
you are going to work on them. Once you get to understand them they are
pretty easy repairs.

Check the standby circuit. If VDR601 was shorted, R644 is likely open and
you need to check the rest of the standby circuit carefully before trying to
start the PS. With external sources of damage I have seen these circuits,
and the soft start and protect circuits damaged.

C609-C612 .22uFd 100V
R653 1 ohm .25W

BTW, Tritronics has many Sony parts on their search engine and if they don't
will do the research for you for free. Other Sony distributors such as
Andrews and Fulton will do the same.

Leonard

"Vince" wrote in message
...
If you have a drawing on this set, I need to know the value of , C
609,610,
611.612 and R653. I changed the three VDRsand I can't find anything else
bad in the ps. I'm going to ask them if they had some lighting, real
popular
around this part of the country. Thank you again for your assistance. I've
serviced this model before and it was always the 4834s and the HOtr.
Vince
"Leonard Caillouet" wrote in message
newsNkme.969$xu3.948@lakeread02...
Flyback is unlikely. If you have not serviced these supplies they can
be
tricky and if you don't have a scope and a variac you may waste parts
and
lots of effort. If the HOT is shorted you likely have bad connections
on
the HDT or a bad cap in the H-drive circuit. If this is the case, you
would
not likely have had the other parts besides Q601,2 and R607 fail. When
you
have other parts fail in the PS it is usually due to something in the PS
or
an external cause such a lightning or a power surge. Basically, every
part
in the PS primary needs to be tested and the PS needs to be checked as
you
start it up slowly for operating frequency, transistor duty cycle, and
output. If you don't have access to the Sony training material it will
be
hit and miss. If you try to fix it yourself, make sure to use P rank
2SC4834 transistors, preferably a matched pair. It is not necessary to
get
them from Sony as many will tell you. Also, check the VDRs carefully.
If
in doubt, change them if you can't test them, though it is not necessary
in
all cases (another Sony related myth). I would suspect them in this
case,
since you noted the additional parts damaged in the PS.

An experienced Sony tech can fix these quickly. We charge $80 labor,
plus
parts for most of them. Also, the CRT needs to be tested at this age to
verify the set is worth fixing.

Leonard



"Vince" wrote in message
...
Hi.
Does anyone know what all I have to do to get this set going? Both oif
the
4834 transistors were blown, the fuse resistor and three of those small
condensers also, the
HOTr chceks good Could I have Flyback trouble?
Thank you for the help
Vince.