[TechAssist] [Fwd: RCA 20" CTC146E power surge.shuts down in 5 sec.FIX]
- From: Phil Bader <philbad@xxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Thu, 31 Jan 2002 14:15:37 -0500
-------- Original Message --------
Subject: RCA 20" CTC146E power surge.shuts down in 5 sec.FIX
Date: Thu, 31 Jan 2002 14:14:33 -0500
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl. Est.1976.vioce/fax
863-299-8821
>
After a power outtage,push power,hear relay click then clicks off.While
on, has good HV,+140V regulated output to pin 11 of fly correct.After
powering on repeatedly while checking one voltage source after
another,found missing +12V run source (low at about 2V).Originates from
12V reg Q4106(emitter outputs thru CR4118,has a small heat sink). Has
all volts around Q4106 but couples output thru diode CR4118. Good volts
at anode,low at cathode.After isolating many paths,I changed the diode.
It was bad,checked OK in ckt. CR4118 caused the shutdown.
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