Re: PTK195 RCA

On Wed, 11 Jan 2006 22:14:33 -0400, "ac611\"remove\""
<"ac611\"remove\""@chebucto.ns.ca> wrote:

>Jason D. wrote:
>> On 11 Dec 2005 06:18:25 -0800, "rm502@xxxxxxxxxxxxx"
>> <rm502@xxxxxxxxxxxxx> wrote:
>>
>>
>>>Len: Go to this discussion on Sci.electronics.repair re your problem.
>>>
>>>http://groups.google.com/group/sci.electronics.repair/browse_thread/thread/bc330b1ed7dc66f8/691677def7a68368?lnk=st&q=ctc195+top+pincushion&rnum=1&hl=en#691677def7a68368
>>>
>>>Also, I have the service data on this Chassis if you need something
>>
>>>from it.
>>
>>>Robert McPherson
>>>Louisville, KY
>>>
>>
>> Don't worry about the chassis, don't adjust! The reason for fuse blown
>> was is the convergence power supply that is blown. It is small board
>> mounted on the black plastic panel. Held down by 1/4" hex bolts. Get
>> that convergence power supply fixed. There are two types of this by
>> the way. One use big black IC on Z shaped heatsink, other one is
>> small U shaped heatsink. Both have different appoaches to repairing
>> those two types.
>>
>> Cheers, Wizard
>Hello again,
>
> I finally got a chance to work on this thing! The convergence power
>supply is not running (as Wizard said), it's the one with the
>STK730-130. I don't have the full schematic but I do have a photocopy of
>a diagram of the power supply from a training manual. Is it safe to try
>to run this with no load to make sure there is no heavy current draw
>from the convergence board, which I understand will shut down the suppy?
>I haven't found anything bad with my meter and I suspect the STK is not
>firing up.
> Thanks for the help,
> Len

You're welcome, Len.

Ok, replace the STK730-130 IC. Any STK730-040 and up will sub in.

And check the diodes on output side just in case, check small
resistors on hot side.

Cheers, Wizard
.