[TechAssist] Re: mitsubishi CK-2690c Dead set no power on the secondary T901
- From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 13 Sep 2002 20:59:02 -0400
Ray,
This may help...
From Tech Repair CD:
**MGA*CK2689R*RA CHASSIS POWER SUPPLY - PROBLEMS WHEN MEASURING VOLTAGES****IN
THE
IC901 STANDBY REGULATOR CIRCUIT USE JUNCTION OF*R901 C907 & R916 AS THE
GROUND.*IN
THE IC902 SWITCHED REGULATOR CIRCUIT USE JUNCTION OF*R906 C917 AS GROUND SEE RA
CHASSIS SCHEMATIC FOR PROPER*VOLTAGES***
1. CHECK FOR A SHORTED ZD1 (5.6V ZENER) AND A SHORTED C2 (100UF 16V).BOTH
LOCATED
ON THE CONTROL-PCB. (ZD1 PT#264P332050)
1. CHECK FOR OPEN R908 (180KOHM 1/4W) LOCATED OFF IC902 PIN 2. (PCB-DEFL) 2.
MISSING STBY 17V SUPPLY. SUSPECT SHORTED C7P5. LOCATED ON LED-PCB OFF PIN 4 OF
"SA" CONNECTOR. (100UF 25V)
Jeff
FAX 717-564-4952
Intrepid Video & Electronics
501 Luther Rd
Harrisburg PA 17111-2055
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----- Original Message -----
From: "ray clarke" <ray260@xxxxxxxxx>
To: "tech" <techassist@xxxxxxxxxxxxx>
Sent: Friday, September 13, 2002 5:14 PM
Subject: [TechAssist] mitsubishi CK-2690c Dead set no power on the secondary
T901
Chassis RA1-C90R Up against a wall on this one. Set
has a primary regulator that goes across a transfo to
power up a second cuurent limmiter/regulator. I had a
2200uF 50v lyte that was shorted to ground on the
secondary of the first transformer.Any ideas?
Ray Clarke
Billette TV Howick, Que
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