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-   -   Sony kv1300e european 1972 color tv (http://www.videokarma.org/showthread.php?t=269652)

lucvic 10-15-2017 10:00 AM

Sony kv1300e european 1972 color tv
 
Hi dear all,
I have this set with issues on power supply.
There are some diodes part number unknown by me.
One is sk1w50, has someone infos on it?

Many thanks

lucvic 10-15-2017 10:47 AM

1 Attachment(s)
Here in attach schema

zeno 10-15-2017 06:40 PM

Zener diode 51 volt 1 watt

73 Zeno:smoke:
LFOD !

lucvic 10-16-2017 04:48 AM

Many thanks

Dear zeno if i will need some further infos I will write to you if you agree

zeno 10-16-2017 09:29 AM

use this link to look up semi's
http://www.nteinc.com/semiconductors.php?a=12

I think what you are working on is in the US a PVM monitor.
Yours may be close to a PVM1200, that may help you.
There are many on this list with experience with them.
Good Luck

73 Zeno:smoke:
LFOD !

dieseljeep 10-16-2017 10:33 AM

Quote:

Originally Posted by zeno (Post 3190863)
use this link to look up semi's
http://www.nteinc.com/semiconductors.php?a=12

I think what you are working on is in the US a PVM monitor.
Yours may be close to a PVM1200, that may help you.
There are many on this list with experience with them.
Good Luck

73 Zeno:smoke:
LFOD !

I thought the model number looked like the PAL version of the KV1200 series.
We had to use the 12" screen size because of our laws, but the rest of the world didn't!

lucvic 10-16-2017 04:45 PM

I.m writing from Italy, so forgive me for my poor english
tomorrow I will post a pic of my set

lucvic 10-17-2017 02:13 AM

1 Attachment(s)
Here it is

zeno 10-17-2017 07:06 AM

Yup dieseljeep correct. I was going by the power supply.
I dont remember that one !
BTW your English is very good !

Ciao
Zeno:smoke:
LFOD !

dieseljeep 10-17-2017 10:07 AM

Quote:

Originally Posted by lucvic (Post 3190903)
Here it is

It looks identical to the KV1212 I had.
Never had a problem with the power supply, but it had bad 'lytics in the PC corrector, where it was distorting the picture on the right. The vertical lines in the picture were curving to the right.
I sold it when the CRT was showing it's age.

lucvic 10-17-2017 02:21 PM

In my set circuit breaker S902 trips (opens) immediately
But i had no time to check components, right now I.m only in studying
Service manual and schematics.
I will let you know news as soon i will have

lucvic 10-18-2017 10:07 AM

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

zeno 10-19-2017 06:23 AM

Does this set use an SCR for horz output ?
Or separate HV & sweep outputs ?
Or just one transistor ?
If SCR usually it shorts & blows the power supply. VERY
hard to fix, either bad drive or load in the HV. If you
dont find everything thats bad will blow again.

Cant help with circuit, schematic too blurry.

73 Zeno:smoke:
LFOD !

lucvic 10-19-2017 08:32 AM

Dear zeno,
If you agree i will send you a private message with my
Email address
Let me know

dieseljeep 10-19-2017 10:16 AM

Quote:

Originally Posted by zeno (Post 3190972)
Does this set use an SCR for horz output ?
Or separate HV & sweep outputs ?
Or just one transistor ?
If SCR usually it shorts & blows the power supply. VERY
hard to fix, either bad drive or load in the HV. If you
dont find everything thats bad will blow again.

Cant help with circuit, schematic too blurry.

73 Zeno:smoke:
LFOD !

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. :sigh:


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