[TechAssist] Re: RCR CTC170R PS output runs hot

Usually if there is a little bit of an overload going on with one line from 
the SMPS, it has an effect of reducing the output a little on one of the 
other lines too if its close to the limits of the SMPS overall current 
output rating.

What were the (2) problems you repaired? This chassis is noted for a bad 
Focus /Regulator assy, which can either be caused by a bad flyback or vise 
versa. Usually the CBA attached to the Focus block is ok, and the focus 
block needs replacing....I have this focus block here , new , although its 
NLA.

Steve Hearns
Technotronic Dimensions, NY [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
1-877-817-9885 (Voice / Fax Toll Free - US Only)
E-Mail: Steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx


----- Original Message ----- 
From: "John at Main TV" <maintv2004@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 28, 2005 4:15 PM
Subject: [TechAssist] RCR CTC170R PS output runs hot


I am working on a RCA PS35680 direct view with a CTC170R chassis made in
1993.  I have repaired 2 problems and now have a good picture but the PS
output transistor runs hot.  At one time someone had added a fan to keep the
PS output cooler but I would like to eliminate that if possible.  I have
already replaced all electrolytics in the primary and several in the
secondary circuit.  The output voltages are correct ecxept the +16v is a
little low.  I have replaced the filters on that line.  The PS output calls
for a 214640 and the one is the set is a 2SC3318.  My main question is is
this a correct output for this set.  It looks like it has been in there a
long time but this set has had a lot of work done to it.  The PS output runs
around 170 degree F.  TIA, John.
John Mielke
Main TV
Longmont,Co 80501
303 776 6955
303 776 0792  fax
maintv2004@xxxxxxxxxxx
www.longmontmaintv.com

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