Last CTC187 I worked on, my OEM HOT was not perfectly flat on the back side which fits against the heatsink. I filed it a bit to make it flatter. Still didn't seem to improve the heat any. Then I added an extra heatsink (after first trying about 10 OEM parts in the circuit- drivere trans., caps, diodes, etc.) and the HOT ran at 40 deg. C rather than 60 deg. without the extra heatsink.




Gary McCartney

McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca







Mark Wentowski wrote:
This is very good advice Joe. And I use OEM's.

MW
Alabama
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Joe Dickerson
Sent: Wednesday, August 25, 2004 7:38 PM
To: ELECTRONICS PROFESSIONALS LIST
Subject: Re: [Techs] CTC187CL3 hot getting too warm


Mark, Make sure you use plenty of heat sink compound on the HOT also. It will definitely make a difference. Joe

Mark Wentowski wrote:

Those output transistors on the 187 do tend to run hot from my experience.
Leave it on and play it for a few days before returning it to the customer
just to make sure. So long as the heatsink doesn't "sizzle" spit on the

end

of your finger then the temperature of the heatsink is probably OK.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of I. Prince
Sent: Wednesday, August 25, 2004 6:16 PM
To: [EMAIL PROTECTED]
Subject: [Techs] CTC187CL3 hot getting too warm


Hello Techs, Working on a RCA Ctc187CL3 which came in dead.FBT was bad Changed it and the HOT after checking all the electrolytics in the horizontal section along with the diodes,the driver transistor and transformer and some resistors.Set came on and worked well for about 10 minutes then HOT went again.I had used a cheaper generic so I stopped looking at the pennies and replaced it with a genuine RCA replacement(#223942)This time I let it run for about five minutes,turned it off and checked the HOT it had gotten so hot that even though I could touch it I could not leave my finger on it.Is there anything that I am overlooking here?Need some help with this one.T.I.A.

I.Prince,
Prince Electronic Center,
Tel:246-425-0033
FaX:708-810-3370



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