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1982 Sony KV2201 - Breaking my 20" rule (again)

 
Mikey66
(@mikey66)
Active V-Ratter Registered

I picked this set up from Boater Sam earlier today.

Once I arrived home the temptation to power it up was too much.

Externally the set is very clean.

2201 01

I don't think the back has ever been off

2201 03

Made in the UK as well

2201 04

Quite clean inside

2201 05

First light. I did just plug it in and switch on

2201 07

A little pink and too wide?

2201 06

I'll heave it onto the bench soon

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Topic starter Posted : 05/10/2019 5:23 pm
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Nuvistor
(@nuvistor)
Famed V-Ratter Registered

Apart from the grey scale there appears little wrong with it.

Frank

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Posted : 05/10/2019 6:42 pm
PYE625
(@pye625)
Famed V-Ratter Registered

It indeed looks very good, a few minor adjustments perhaps only being required.

To understand the black art of electronics is to understand witchcraft.
Andrew.

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Posted : 05/10/2019 7:02 pm
crustytv
(@crustytv)
Vrat Founder Admin

In case you've not got the data to attempt purity & grey-scale, the data book states the 2201 uses the same method as the 2040

son1

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Posted : 05/10/2019 7:05 pm
Mikey66
(@mikey66)
Active V-Ratter Registered

I had the Sony on the bench last night and whilst checking the CRT drive voltages I noticed a wisp of smoke from the PSU board.

Switch off quick, disconnect the mains and put my heat sensitive finger to use.

I unexpectedly burnt said digit on C641, which was hot.... very hot.

C641 looks like the reservoir cap for the 200V  HT to the RGB transistors on the CRT base. A replacement was fitted and the set was left to run for the evening.

2201 08

Looks a lot worse underneath

2201 09

Thanks for the info Chris, I'll take a look with a view to setting the grey scale.

The picture is too wide, I'm hoping it's just a simple adjustment of the width pot....when I find it.

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Topic starter Posted : 06/10/2019 11:28 am
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crustytv
(@crustytv)
Vrat Founder Admin

Just in case you need it I've scanned and uploaded the circuit for the KV-2201 to the data library ?

snip

Snippet

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Posted : 06/10/2019 12:18 pm
Red_to_Black
(@red_to_black)
Noble V-Ratter Registered

Ooh I noticed the Pin out active device is the dreaded (expensive!) SG264A gate controlled switch, thankfully it looks to be OK in this instance, with just the width and not the Pin out as well being slightly out.

"This is my multimeter. There are many others like it, but this one is mine. My multimeter is my best friend. It is my life. I must master it as I must master my life. Without me, my multimeter is useless. Without my multimeter, I am useless."

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Posted : 06/10/2019 3:22 pm
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acj1980
(@acj1980)
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great tv, i have one similar for years ago, it also still works fine, but as the other mention, yours have a little colour ajust issue, 🙂

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Posted : 06/10/2019 7:23 pm
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Mikey66
(@mikey66)
Active V-Ratter Registered

Hello again,

Well the Sony came up good after fettling.

The excessive width was simply a dirty pot, which responded to some Servisol, being of a similar type I also cleaned the HT, width & pincushion pots.

A grey scale setup followed and it was noticed the picture lacked punch, the brightness control having little effect.

I checked the tube on my BK467 it read 90% on all the guns so obviously a low mileage tube. Voltage checks on the tube base revealed nothing untoward so a circuit diagram was acquired.

Armed with said diagram I was still getting nowhere, so I started checking components in the ABL section (Sony's take on the beam limiter).

On the D board there was an old style carbon resistor (R531) which read nearly 3meg should be 150k. replacement brought a nice bright picture.

My photography skills don't do it justice & I'm not happy with the pincushion correction, but for now it has pride of place as my bedroom telly.

2201 13
2201 10

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Topic starter Posted : 13/10/2019 2:59 pm
Red_to_Black
(@red_to_black)
Noble V-Ratter Registered

This set uses the YE2 chassis, apart from the expensive GCS (SG264A) which can cause pin cushion correction (PCC) troubles I have in the past had one of the various inductors  associated with Q902 being faulty in some way causing poor PCC, all L8XX, there are a few 3.3uH ones dotted about that circuit, plus a 12 mH one, I cannot recall which one in the end was the cause of the problem as I had a scrap chassis and just substituted (swapped them) one at a time until the fault cleared ? , fault finding at its finest ?

"This is my multimeter. There are many others like it, but this one is mine. My multimeter is my best friend. It is my life. I must master it as I must master my life. Without me, my multimeter is useless. Without my multimeter, I am useless."

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Posted : 13/10/2019 4:18 pm
Mikey66 liked