Sony KV2022 - poor field linearity - UK Vintage Radio Repair and Restoration Discussion Forum

jan_tomek · 21st Sep 2006, 12:39 am

Hello everybody,

I saved this nice set from scrap, and after resolving few minor faults there stays the last one, which I cannot solve without advice or schematic - poor vertical linearity. Could somebody kindly help me to continue?

Thanks in advance

Jan

Steve_P · 21st Sep 2006, 2:15 am

Capacitors in the Frame Stage area.

Cheers,

Steve P

Top Cap · 21st Sep 2006, 3:57 am

Yeh! Def go for the capacitors but I do remember a similar fault on a GEC set where I changed everything but still poor linearity. So I decided to change both the MAIN and TOP LIN controls, (oh but these never go wrong!) and kowabunga a perfect picture. So you never know where the Gremlin is hiding.
Sorry I do not have the 1980/81 copy of R & TV servicing as it prevents me from doing any circuit analysis for you.
Les

dsergeant · 21st Sep 2006, 7:34 am

Capacitors are the most likely. It uses a discrete transistor field output stage and not that easy to identify the likely ones. It also has a Field Linearity control, RV553 and associated cap C566 - does adjusting that sort it out? Have the circuit in the old blue Sony compilation books but it is quite small and hard to follow and not sure if I could do a good scan.

Dave

Nickthedentist · 21st Sep 2006, 9:33 am

Is this similar to the KV-2020 - maybe with remote control?

If so, I've got a manual somewhere, but not here... you'd have to wait a few weeks.

I have a KV-2020 and have to say that it's a superb performer and 100% reliable.

Nick.

jan_tomek · 22nd Sep 2006, 3:04 pm

Thanks to everybody for replies, I am going to kick out the parts suspected.
For Nick: I am not 100% sure - maybe. It has remote control. In fact, it is KV2022MR, a "dual" set for both CCIR/OIRT standards (OIRT was formerly used in Soviet enslaved countries, colour in SECAM and 6.5 MHz sound IF subcarrier).

Nice weekend for you all

Jan

21st Sep 2006, 12:39 am	#1
jan_tomek Retired Dormant Member Join Date: Sep 2006 Location: Praha CZ Posts: 3	Sony KV2022 - poor field linearity Hello everybody, I saved this nice set from scrap, and after resolving few minor faults there stays the last one, which I cannot solve without advice or schematic - poor vertical linearity. Could somebody kindly help me to continue? Thanks in advance Jan

21st Sep 2006, 2:15 am	#2
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Sony Kv2022 Capacitors in the Frame Stage area. Cheers, Steve P __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

21st Sep 2006, 3:57 am	#3
Top Cap Octode Join Date: Mar 2006 Location: Watford, Hertfordshire, UK. Posts: 1,270	Re: Sony Kv2022 Yeh! Def go for the capacitors but I do remember a similar fault on a GEC set where I changed everything but still poor linearity. So I decided to change both the MAIN and TOP LIN controls, (oh but these never go wrong!) and kowabunga a perfect picture. So you never know where the Gremlin is hiding. Sorry I do not have the 1980/81 copy of R & TV servicing as it prevents me from doing any circuit analysis for you. Les

21st Sep 2006, 7:34 am	#4
dsergeant Octode Join Date: Mar 2006 Location: Bracknell, Berkshire,UK. Posts: 1,175	Re: Sony Kv2022 Capacitors are the most likely. It uses a discrete transistor field output stage and not that easy to identify the likely ones. It also has a Field Linearity control, RV553 and associated cap C566 - does adjusting that sort it out? Have the circuit in the old blue Sony compilation books but it is quite small and hard to follow and not sure if I could do a good scan. Dave

21st Sep 2006, 9:33 am	#5
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,865	Re: Sony Kv2022 Is this similar to the KV-2020 - maybe with remote control? If so, I've got a manual somewhere, but not here... you'd have to wait a few weeks. I have a KV-2020 and have to say that it's a superb performer and 100% reliable. Nick.

22nd Sep 2006, 3:04 pm	#6
jan_tomek Retired Dormant Member Join Date: Sep 2006 Location: Praha CZ Posts: 3	Re: Sony Kv2022 Thanks to everybody for replies, I am going to kick out the parts suspected. For Nick: I am not 100% sure - maybe. It has remote control. In fact, it is KV2022MR, a "dual" set for both CCIR/OIRT standards (OIRT was formerly used in Soviet enslaved countries, colour in SECAM and 6.5 MHz sound IF subcarrier). Nice weekend for you all Jan