Gary
Gary McCartney
McCartney Electronics Guelph Ontario Canada Est. 1984 email: gary (at) number63.ca
LeRoy Westlund wrote:
You need to check the Horz driver transformers on these CTC187 chassis. If they look melted, from too much heat, a new one will drop the temperature slightly, but no matter what you do,...they will still run too hot. I think it's a just a poorly engineered design. They should have put larger heatsinks on them to start with.
IMHO. LLW
LeRoy Westlund Westlund TV & Electronics 97 North Main "Where there's a will,... Centerfield, UT 84622-0087 There's always a way." Ph./Fax 435-528-3822 mailto:[EMAIL PROTECTED]
-----Original Message----- From: Gary McCartney <[EMAIL PROTECTED]> To: ELECTRONICS PROFESSIONALS LIST <[EMAIL PROTECTED]> Date: Wednesday, August 25, 2004 10:16 PM Subject: Re: [Techs] CTC187CL3 hot getting too warm
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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