[TechAssist] Re: Magnasonic TV model GCT5532 B+ not regulating
- From: <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 7 Aug 2003 21:38:10 -0300
Gary,sending you a scan of GCT5500 series power supply.........
Don of HARTS-TVCR-ASC
9 Robert St,Oromocto,NB,Canada,E2V3N2
Tel-506-357-9785,Fax-506-357-6010
hartstv@xxxxxxxxxxx
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, August 07, 2003 7:12 PM
Subject: [TechAssist] Magnasonic TV model GCT5532 B+ not regulating
> I have a Magnasonic TV model GCT5532 (unknown chassis no.) which I
> replaced the HOT, shorted darlington B+ regulator transistor Q601
> (2SD1197), and an open 3.9 ohm 5W resistor also in power supply. The B+
> to the HOT will climb to 140V or more if I increase the variac AC input
> up toward 120 VAC. The set works otherwise. I don't know exactly what
> the normal operational B+ level is supposed to run at and I don't notice
> any labels on the board specifying so either.
>
> I have checked all the resistors and caps in the regulator circuit plus
> the 5.5V regulator IC651 (has 5.5V output). The 220 Ohm 20W bypass
> resistor is ok. The B+ adjust trim pot tests ok and varying it doesn't
> make any difference in the B+ output.
>
> THanks for any help.
> --
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
>
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