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  #16  
Old 10-19-2017, 11:26 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by lucvic View Post
Hi dear all,
Power supply is a buck converter not insulated.
I.m not so familiar with circuit of kick start circuit used in this set
In particular functions of part with d603 C603 d602 and q601
Can you help me in understanding?
Thanks
Your English is fine, terminology a little different.
The term "buck converter, not insulated" is an auto-transformer, one 240 volt winding, tapped at 120 volts, as the set was designed for 100/120 volt Japanese/US mains and is being used in 230/240 volt countries.
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  #17  
Old 10-19-2017, 01:28 PM
zeno zeno is offline
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Quote:
Originally Posted by dieseljeep View Post
The KV1212 uses the 2SC267 transistors in the HV sweep circuits.
The circuit is a little tricky and it used selected components. You generally had to use genuine Sony replacements which were hard to get, even years ago. They generally failed when the horiz driver transformer connections needed resoldering.
They also used those transistors in the power supply.
Never had problems with the 2 output sets, just electrolytics.
SG sets we refused to do so I only did a few for some VERY good customers.
Even when I worked for Sony I didnt do them. Other problem is Sony
would use a totally different chassis in the same model ##. Had to go
by the serial ## or SCC chassis ##.
IIRC on the KV1710 some had a different supply using a second SG-613.
What a dog & cost $$$$$$ to fix.
BTW wernt they 2SC867 ?

73 Zeno
LFOD !
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  #18  
Old 10-19-2017, 01:36 PM
zeno zeno is offline
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Quote:
Originally Posted by lucvic View Post
Dear zeno,
If you agree i will send you a private message with my
Email address
Let me know
Yes you may PM me

Zeno
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  #19  
Old 10-19-2017, 01:58 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by zeno View Post
Never had problems with the 2 output sets, just electrolytics.
SG sets we refused to do so I only did a few for some VERY good customers.
Even when I worked for Sony I didnt do them. Other problem is Sony
would use a totally different chassis in the same model ##. Had to go
by the serial ## or SCC chassis ##.
IIRC on the KV1710 some had a different supply using a second SG-613.
What a dog & cost $$$$$$ to fix.
BTW wernt they 2SC867 ?

73 Zeno
LFOD !
Right-on! 2SC867. It's been ages.
I remember the chassis differences. I have several Sonys in my collection.
I think I have a KV1710 that I think is going to be scrapped.
I had a little grief with a SG-613 set. When repaired, it lasted around 15 months. When it failed again, I told the customer, "forget it"!
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  #20  
Old 10-20-2017, 07:39 AM
lucvic lucvic is offline
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Posts: 21
dear guys, I sent you Pm to both of you

many thanks
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  #21  
Old 10-24-2017, 04:36 AM
lucvic lucvic is offline
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Hi dear all,
In PR board ( POWER SUPPLY) there is D607 S-15 diode. I can.t find daras on this
many thanks
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  #22  
Old 10-24-2017, 04:38 AM
lucvic lucvic is offline
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Only an equivalent on nteinc
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  #23  
Old 10-24-2017, 06:36 AM
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Celt Celt is offline
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Good looking set!
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Let me live in the house beside the road and be a friend to man.
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