UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Television and Video

Notices

Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

Closed Thread
 
Thread Tools
Old 9th Apr 2010, 11:09 pm   #181
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Tv62

Ahhh, without wanting to be on the wrong side of John's wrath, the time may have come to change a few.

Firstly, replace that suspect resistor. If that still shows the same then switch off and measure resistance pin 1 to chassis (looking for leakage in C15 or C16) and pin 2 to chassis (check the grid resistor chain R20 and VR2).
PJL is offline  
Old 9th Apr 2010, 11:12 pm   #182
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Ok new 1M res in place of the gone high (4M) one now I have nearly full width, without the clipped in .01 cap the collapsed line crossed the entire screen with cap clipped in just one small edge is missing, now warmed up whole screen filled


Ooooo we are getting there

This is only working as I say with the clipped in cap on PCL83 pin 4 - pin 9
Attached Thumbnails
Click image for larger version

Name:	Zi6_9559.jpg
Views:	109
Size:	76.7 KB
ID:	34293  

Last edited by oldticktock; 9th Apr 2010 at 11:24 pm.
oldticktock is offline  
Old 9th Apr 2010, 11:18 pm   #183
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
Default Re: Tv62

What about the height? Will this be working by midnight? I'll check in later to see.
__________________
Graham. Forum Moderator

Reach for your meter before you reach for your soldering iron.
Station X is online now  
Old 9th Apr 2010, 11:29 pm   #184
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Tv62

Check pin 1 voltage again. If it's still low replace C15 and C16 for starters.
PJL is offline  
Old 9th Apr 2010, 11:33 pm   #185
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

R20 should be 680k but is 2.7M aha another way high res.... Cheers PJL your deductions are spot on.

The cap next to it is oh so sticky C13

another resistor replacement coming up

Once out I read 703K so it must be the parallel cap C13 causing the odd reading, as now the new one read odd too.

Pin 1 voltage is 4.1v

C13 is in serious need of replacement it's just weeping, I mean theres dead and dead this thing is abuses the right to be dead.

Chris

Last edited by oldticktock; 9th Apr 2010 at 11:55 pm.
oldticktock is offline  
Old 10th Apr 2010, 12:18 am   #186
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Ok It still works with C13 replaced I know that was not discussed but it was weeping all over the place.

As for C15 & C16 well that's venturing into the mare I anticipated coming, under the Tag board.


So as we have entered the wee small hours I think this is the place to pause and regroup for tomorrows attack.

Perhaps tomorrow will bring the final success, Graham (Station X) soz did not manage it.

Thanks to all for the patience.

See you tomorrow



P.s just to recap (scuse the pun)

R19 replaced This had the effect of giving full width to the on screen noise
R20 replaced
C13 replaced
0.1 clipped in on pin4 - pin9 this stops from collapse.

That's where we are folks
Chris
Attached Thumbnails
Click image for larger version

Name:	Zi6_9560.jpg
Views:	94
Size:	96.0 KB
ID:	34294  
oldticktock is offline  
Old 10th Apr 2010, 12:44 am   #187
FRANK.C
Heptode
 
FRANK.C's Avatar
 
Join Date: Feb 2006
Location: Roscommon, Ireland
Posts: 732
Default Re: Tv62

Hi Chris
Well done great result so far.
A very interesting thread.

Keep up the good work.
Frank
FRANK.C is offline  
Old 10th Apr 2010, 6:15 am   #188
ppppenguin
Retired Dormant Member
 
ppppenguin's Avatar
 
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
Default Re: Tv62

First light on the CRT is always a magic moment. It's looking really good. You've got a good CRT and LOPT so there should be nothing really nasty in the woodwork (bakelite?) now.

There will be a lot of resistors way off value, especially the high value ones, over 100K, which go even higher. There comes a point where you think about measuring the lot and replacing as required. Many can be measured in situ, others will need one end lifted to get a true reading. This is also the time to change all the waxies in the timebase section. JW would say do one at a time and test between each. I tend to do a bulk job and take a lot of care. It's worth marking up the circuit with highlighter pen to show which parts you have changed.
ppppenguin is offline  
Old 10th Apr 2010, 7:45 am   #189
audiomagpie
Heptode
 
audiomagpie's Avatar
 
Join Date: Apr 2003
Location: Rugby, Warwickshire, UK.
Posts: 816
Default Re: Tv62

Well done Chris, you've been extremely patient and very methodical in your approach and this has led to a great result. Have enjoyed the post thus far, look forward to seeing you getting all the final tweaks sorted now. Hope I have the same success with me ol' fergie!

Greg
__________________
Greg

BVWS committee chairman
audiomagpie is offline  
Old 10th Apr 2010, 9:03 am   #190
Heatercathodeshort
Dekatron
 
Heatercathodeshort's Avatar
 
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Tv62

You can now remove the temporary feed capacitor as it has proved it's point. Yes I did give you component numbers from the trader sheet so I will just go over that last bit gain using the original Bush manual dated 1956 technical publication 1075.
The resisitors mentioned are R19 directly connected to pin 1 of the PCL83. The other end of this is decoupled by a 2uf capacitor marked C14. This point is then taken via R37 to the boost supply rail. I think you have worked this out and taken the required action.

Yes to everyone. I think it is time to replace the wax capacitors as they all appear to be in a sorry state in that circuit. C11, C12, C13, with particular regard to C15 and C16.
If in doubt, clip one end clear and as a temporary measure connect the replacement on the tag side of the board. Carry this out which ever way you feel comfortable with.
The only reason I say replace one componenet at a time is that it prevents introduced faults and probably more importantly allows you to observe the effect of faulty components. Emample, 'cogged' picture due to leaky sync coupling capacitor, squashed top or bottom or both of picture due to poor frame linearity etc. You are almost at the point of getting a picture and it will be a very good one.
To help clarify the circuit numbers I have scanned the manual I am using so you can tie it up with yours.
Just one note about the Aurora. It might appear to be a Dinky toy when first encountered but its one of the few things in life when size is not important. It's a fantastic bit of kit that will allow you to see 405 line television exactly as it was transmitted. It is so realistic that when working on 405 receivers and playing test card 'C'
CD's and music, I honestly forget sometimes that it's 2010 and not 1964. Now can we have a version please that can reverse my age back to 16 instead of 61....
Take it easy Chris and you will get there. Regards, John.
PS Just been called out on HGV recovery so may not be back till later. Good luck!
Attached Thumbnails
Click image for larger version

Name:	TV62.jpg
Views:	102
Size:	77.9 KB
ID:	34295  
Heatercathodeshort is offline  
Old 10th Apr 2010, 9:08 am   #191
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Morning John,

Thanks for the advice and I shall once more enter the fray.

Fantastic fun and great to learn from all the masters of TV.

I have to say all last night I was dreaming of TV62 circuits, caps resistors frame collapses, madness!!!! amazing how the mind just does not stop.

I made a cable up this morning for the Aurora and found a 9v 300ma adapter from one of my DECT phones, this is the closest to the 9v 250ma specified in the Aurora manual.

It would be nice to see a test card by the end of today, those tricky to get at caps might slow me up though.

All the Best Chris

Last edited by oldticktock; 10th Apr 2010 at 9:36 am.
oldticktock is offline  
Old 10th Apr 2010, 9:28 am   #192
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Just before I get cracking and recapping, thought I would just pop up some of the photos of yesterdays re-assembley before all the fun started.

I know It went against the grain to not clean before testing, but by taking a methodical approach taking, notes and extreme care i'm sort of glad the mucky work is done. I also fully accept this is not best practice and have visited the headmaster

Chris
Attached Thumbnails
Click image for larger version

Name:	Zi6_9538.jpg
Views:	126
Size:	73.8 KB
ID:	34296   Click image for larger version

Name:	Zi6_9543.jpg
Views:	123
Size:	64.7 KB
ID:	34297   Click image for larger version

Name:	Zi6_9547.jpg
Views:	120
Size:	107.7 KB
ID:	34298   Click image for larger version

Name:	Zi6_9550.jpg
Views:	119
Size:	113.9 KB
ID:	34299   Click image for larger version

Name:	Zi6_9532.jpg
Views:	118
Size:	75.6 KB
ID:	34300  

oldticktock is offline  
Old 10th Apr 2010, 9:41 am   #193
Sideband
Dekatron
 
Sideband's Avatar
 
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,548
Default Re: Tv62

Excellent work! Almost makes me want one as well.....!


Rich.
__________________
There are lots of brilliant keyboard players and then there is Rick Wakeman.....
Sideband is offline  
Old 10th Apr 2010, 11:13 am   #194
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

I take it 0.022uF can be used instead of 0.02uF
oldticktock is offline  
Old 10th Apr 2010, 11:20 am   #195
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
Default Re: Tv62

Yes.
__________________
Graham. Forum Moderator

Reach for your meter before you reach for your soldering iron.
Station X is online now  
Old 10th Apr 2010, 1:42 pm   #196
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Busy morning replacing cap's, the under tagboard ones were tricky.

One side was easy to see where the wire was attached, I noted their relative tag points down on my notes then snipped that side. Checking the schematic I ascertained where the other end should be attached, gently pushing the waxy cap back and forth under the tag board confirmed.

Snipped the other end and again noted tag position on my notes.

So for the benefit of John and others following this is what has been changed so far

At the Outset
C36 snipped one side (mains filter cap)

Yesterday
C31 0.5uf
C38 0.5uf
C33,C34 &C35 100+100+200uf Electrolytics
R19 1M
R20 680K

Today
C11 0.022uf
C12 0.022uf
C15 0.05uf
C16 0.1uf
C26 0.1uf (As It was next to C16 and I had to snip a wire to gain access, thought i would do it now instead of later)

Ok just going to tidy the bench and make a cuppa then start the set up.

Chris
Attached Thumbnails
Click image for larger version

Name:	recap.jpg
Views:	99
Size:	112.1 KB
ID:	34302   Click image for larger version

Name:	Zi6_9565.jpg
Views:	80
Size:	22.7 KB
ID:	34303  

Last edited by oldticktock; 10th Apr 2010 at 2:08 pm.
oldticktock is offline  
Old 10th Apr 2010, 2:28 pm   #197
oldticktock
Retired Dormant Member
 
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
Default Re: Tv62

Ok powered up after recap without the clipped in cap, and still frame collapse.

I suppose on the positive It does not look as though I introduced another fault with the recap. On the negative side did'nt fix anything.

Chris
Attached Thumbnails
Click image for larger version

Name:	Zi6_9568.jpg
Views:	92
Size:	83.7 KB
ID:	34305  
oldticktock is offline  
Old 10th Apr 2010, 2:31 pm   #198
Steve_P
Dekatron
 
Steve_P's Avatar
 
Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
Default Re: Tv62

Check the voltages on the frame output valve and frame oscillator valve. Has anything come off?

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...?
Steve_P is offline  
Old 10th Apr 2010, 2:46 pm   #199
Boom
Retired Dormant Member
 
Join Date: Jan 2007
Location: Westbury, Wiltshire, UK.
Posts: 2,451
Default Re: Tv62

I don't want to add to any confusion Chris but the cap' trick might also show if the oscillator stages are capable of functioning if you stab it from the heater to V3a pin 2 or V2a pin 1

Dave
Boom is offline  
Old 10th Apr 2010, 2:47 pm   #200
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Tv62

Try measuring the voltage on pin 1, 2 and 3 of the PCL83 again.
PJL is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 4:16 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.