Hello everyone,
Just wanted to say thanks for the prompt, helpful and friendly
replies. I plan to take all the advice on-board. Very much appreciated!
Cheers,
-Matt.
Am 03.02.2010 um 11:26 schrieb Frank Moscowitz:
Matt - I'd say you may as well replace the TIP-35, 36 pass
transistors, especially if you're getting in there to apply fresh
heatsink compound - I replaced a shorted pass transistor on a
"tired" PS3 recently. Keep the old ones as used spares!
Frank
On Tue, Feb 2, 2010 at 12:29 PM, Ike Zimbel
<[email protected]> wrote:
Yes, what Jim said. Other notes:
-I don't have any real experience with the PS-4, but someone sent me
some pics once, and that one, at least, showed some signs of running
too darn hot!
-Please don't use the dab of silicone! The supplies will be
stationary, so vibration won't be an issue. Silicone dabbing just
makes life difficult for future repair people...like me!
-The low supply voltages are kind of intriguing. I would change the
main filter caps first and then measure again. I have seen supplies
have trouble reaching their designed voltage if these caps were bad.
-36 volt supply is only half wave rectified and un-regulated, so it
may look a bit rough, should look better with new caps.
-Keep a sharp eye out for any signs of overheating in the +/-18v
output sections, especially around the fuse holders, TIP-35, 36
transistors and the large power resistors. If you see signs of this,
a good de-soldering, clean up and re-soldering is in order. Replace
parts that have a crystalline look to their leads...they have had
too much heat.
-The OVP trimmer should not affect output voltage.
Will try and write more later. See previous posts about internal
mechanical ground connections between the various metal parts of the
supply.
best,
Ike
On 2/2/2010 12:06 PM, Jim wrote:
Hi Matt,
Sounds like you have a great plan for the supply. I usually go to
the next higher voltage and capacitance for the ElCaps; IIRC they
may have been a better physical fit. If you can find the higher temp
versions than the standard 80C that would be a good choice.
Otherwise seems you've got it right. Good luck!
Regards, Jim
