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#1
05-17-2021, 12:47 PM
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Re-acquired my Sony KV-1204A...
So a bit under two years ago I posted a thread here about a non-working Sony KV-1204A Trinitron TV from 1977, and mentioned I gave it to a friend. Well, said friend was cleaning out his garage and...I've got the KV-1204A back, and now with a bit more knowledge under my belt, I'd like to try again to resurrect it.
I'd like to start by probing around with a multimeter to see if voltage is getting into the set, what are some good places to do that? 
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#2
05-17-2021, 06:01 PM
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If you go to the anode of the horiz output (assuming an SG613), you should get over 100VDC. If there's nothing, check anode to ground for short. If it is (common), you'll need the SG, the 867A regulator, a damper diode, and maybe a low value resistor. I can't remember if these used circuit breakers or fuses..
John
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#4
05-21-2021, 08:05 PM
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Did some probing inside the set, the two TO-3s I could find (marked SG-246A and C867A) both only gave 0 volts. I also measured a fuse I found on one of the boards for continuity and it has continuity, so I don't really know what to check next.
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#5
05-22-2021, 08:07 AM
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You will NEED OEM only
1) SG246A IIRC subs to a SG613 1) 2SC867A 1) damper diode. It has been updated with new part number. 1) resistor in the hoz drive usually burns. Need manual to get value. 1) manual with MATCHING chassis number. Change it ALL AT ONCE ! One of 3 things will happen 1) everything will blow again in one microsecond. 2) set will work perfect then usually withing a week blow everything without any warning. 3) the set will work for years more. HINT most Sony color sets between apx 1975 & 1980 used the SG613 & 2sc867. If you get one with a bad CRT but the set works pull those parts, they are not cheap. Dont reuse the damper. 73 Zeno  LFOD !
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#6
05-22-2021, 12:36 PM
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Quote:
The newer models that used the SG613 were a rather big headache. I did everything by the book, the set failed a year or so later. I checked the set out and it seemed like the same failure. I told the owner it wasn't worth repairing, as I cant see the picture. Those CRT's didn't fair that well.
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#7
05-22-2021, 01:14 PM
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Before the SG sets Sony wasnt that hard to deal with except getting parts.
The set with 2 HOT's used one for sweep & one for HV. Panasonic also tried it. It worked good. 2SC867 were also used for vert outs. In the day they net abt $8 & SG613's abt $25. The first SG set was a 17" with all the controls along the bottom. Early runs had an SG in the power supply & another for the HOT. That was an absolute nightmare ! Its in Sams if you want to see one. I took one look at it & ran like hell ! Having one was like a cloud of doom hanging over the shop. NOT for the faint of heart  73 Zeno LFOD ! Quote:
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#8
05-22-2021, 04:45 PM
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Quote:
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Linear Mode
