Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Early B&W and Projection TV

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #46  
Old 07-05-2004, 07:13 PM
Steve K Steve K is offline
VideoKarma Member
 
Join Date: Sep 2002
Location: Thousand Oaks, CA
Posts: 503
Don't test capacitors, just cut or unsolder one end and solder tack a new one in if you do not want to replace it right away. I'll have to dig out a schematic of your set to let you know which ones might be causing your problem.
Steve
Reply With Quote
  #47  
Old 07-05-2004, 08:51 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
I have the schematics of my set as a jpg file.

Its a TS-4D

If you want me to post them, or email them to you, I will do so.
Reply With Quote
  #48  
Old 07-05-2004, 10:05 PM
Steve K Steve K is offline
VideoKarma Member
 
Join Date: Sep 2002
Location: Thousand Oaks, CA
Posts: 503
I sent you a PM.
Steve
Reply With Quote
  #49  
Old 07-06-2004, 06:53 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
you also have a PM
Reply With Quote
  #50  
Old 07-06-2004, 09:54 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
Pictures are worth a 1000 words! See for yourself what my problem was.

The sync issue was a bad 25mmf cap.

I noticed most of the MMF caps are wax/plastic caps.

Last edited by Eric H; 07-06-2004 at 10:40 PM.
Reply With Quote
Audiokarma
  #51  
Old 07-06-2004, 09:56 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
and #2

Last edited by Eric H; 07-06-2004 at 10:41 PM.
Reply With Quote
  #52  
Old 07-06-2004, 09:58 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
and last but not least, picture #3.

That is the actual picture you see. Actual focus.

The picture looks almost exactly the same on the face of the CRT, but its not to scale


the two 4.7megohms on the plates of the vertical circuit have been replaced, but they didnt make a difference. all the high megohm resistors are well within tolerance. couple of them read exactly 10megohms.

Last edited by Eric H; 07-06-2004 at 10:41 PM.
Reply With Quote
  #53  
Old 07-06-2004, 10:37 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
Did you use Ceramic disc caps to replace the 6000v in the vertical circuit? That will cause this type of problem in these sets. They seem to work OK in the horiz position tho.

Check the vertical pots for continuity from end to end also, not sure how they are used in this set but I had a Hallicrafters with that problem and it was an open pot.
Reply With Quote
  #54  
Old 07-07-2004, 11:29 AM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
Steve K told me that the reason I dont have a vertical linerity control, because each plate has the exact same waveform, but its inverse from each other, and for some reason its not the same on mine.

No, I dont have ceramic caps on the vertical stage. just the horizontal stage.

I have big brown caps on the vertical stage. There old, they were already in the set, and they test fine with no leakage. So, I used them. I dont have the money to purchase anything from allied, and they can shove that minimum fee up thier a**.

First, I thought one of those are bad, but I removed each one from circuit, and left the other in. Vice Versa, they both affected the picture when either one was removed. If i remove them both, there isnt any sweep.

So the caps are good, and I did a capacitor check on them through my DMM, and they test alright. There isnt any leakage.

Last edited by mbates14; 07-07-2004 at 11:34 AM.
Reply With Quote
  #55  
Old 07-07-2004, 06:40 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
I'm still suspicious of those caps, they could be breaking down under high voltage.

PM me with your address and I'll send you a couple new ones.

Eric


Quote:
Originally posted by mbates14


So the caps are good, and I did a capacitor check on them through my DMM, and they test alright. There isnt any leakage.
Reply With Quote
Audiokarma
  #56  
Old 07-07-2004, 07:35 PM
Steve McVoy's Avatar
Steve McVoy Steve McVoy is offline
VideoKarma Member
 
Join Date: Oct 2002
Location: Columbus, Ohio
Posts: 1,477
Look at the waveforms on the two grids of the 6SL7. Do they look the same, but inverted (same amplitude, slope)?

The second half of the 6SL7 gets its signal from the plate of the first half, through C57, C142, R117, R58, C58 and R57. If any of these parts is bad it will result in an improper waveform on the grid of the second section, and therefore bad linearity.

Last edited by Steve McVoy; 07-07-2004 at 07:38 PM.
Reply With Quote
  #57  
Old 07-07-2004, 07:50 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
you do have a point there.

ill get right on it.


Eric also mentioned that the HV caps could be breaking down under load. He probably is right.

These are NOS caps.
Reply With Quote
  #58  
Old 07-07-2004, 08:12 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
OK. I took pictures of the Oscilloscope.

The first picture here is the probe clipped to grid on pin 1:
Reply With Quote
  #59  
Old 07-07-2004, 08:14 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
This is the Oscilloscope picture of the probe clipped to grid pin 4.

I dont know if its my eyes, but the P-P isnt too great as the first one.

The first one looks mighty strong and healthy. The second one, its hard to tell.
Reply With Quote
  #60  
Old 07-07-2004, 08:16 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 1,003
Dont ask about my oscilloscope, and why it looks that way.

I took the faceplate and scale off, because the CRT is weak, and you can hardly see the trace through it.
Reply With Quote
Audiokarma
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:32 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.