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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Emerson EWC1902 High voltage shut down?
Hello all,
I have an Emerson TV/VCR combo unit, model # EWC1902 that came in my shop with a shorted horizontal output transistor Q571, and a bad zener diode D615 so I replaced these components, which I had to order from Funai, and now the unit comes on for a second, but I have a high voltage problem, which sends the set in to shut down, and I am not sure which regulator or component is causing this, Just for the archives, Q571 had a TT2140 on it, but Funai sent me a 2SD2627 as a replacement, and D615 had a 332.G on it, but this turned out to be a 33 volt zener diode. It looked like a quarter watter. Any help would be greatly appreciated. Dave |
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Emerson EWC1902 High voltage shut down?
When D615 shorts it means the power supply is not regulating. This is usually
either caused by bad solder connections on transistor Q604 (located on the very back of the chassis to the left of the AC cord), or a crack on the board near the small screw by the B+ adjustment pot just to the left of the transistor. Good luck, Hello all, I have an Emerson TV/VCR combo unit, model # EWC1902 that came in my shop with a shorted horizontal output transistor Q571, and a bad zener diode D615 so I replaced these components, which I had to order from Funai, and now the unit comes on for a second, but I have a high voltage problem, which sends the set in to shut down, and I am not sure which regulator or component is causing this, Just for the archives, Q571 had a TT2140 on it, but Funai sent me a 2SD2627 as a replacement, and D615 had a 332.G on it, but this turned out to be a 33 volt zener diode. It looked like a quarter watter. Any help would be greatly appreciated. Dave |
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Emerson EWC1902 High voltage shut down?
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#4
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Emerson EWC1902 High voltage shut down?
EWC1302 Seems to the the same chassis as EWC1902. It appears the only
difference is the picture tube on the EWC1302 is a thirteen inch, and EWC1902 has a 19 inch picture tube. |
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