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  #31  
Old 06-24-2015, 08:10 AM
DaveWM DaveWM is offline
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oh one more thing, that RCA service manual does NOT cover the CTC-7 chassis, think it starts with CTC-12, as far as schematics are concerned.

BUT it has great info on CRT setup as well as explanation on how various circuits in the set work. The CTC-7 is very similar in operation as the CTC-12 so the info is still valid.
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  #32  
Old 06-24-2015, 08:41 AM
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SwizzyMan SwizzyMan is offline
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Quote:
Originally Posted by DaveWM View Post
https://www.youtube.com/watch?v=QNtsTKVPO7I

at about 7:00 it talks about setting up purity.

Before doing anything else I recommend you look on ebay for an RCA color service manual by carl babcoke.

http://www.ebay.ca/itm/RCA-COLOR-TV-...3D311360906136

oh and start looking for a degaussing coil.
I just picked up the book. Is there any way I could make my own degaussing coil or use one from a modern day tv?
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Admiral C322C2 Regent (Restoring)
RCA CTC-7 Pensbury (Restored)
RCA CTC-5 Westcott (Restored)
CRA CTC--4 Director 21 (Restoring)
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  #33  
Old 06-24-2015, 04:14 PM
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Also just picked up a leader lcg-400 so hopefully it works when it gets here and I can finally do the convergence and color adjustments correctly.
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  #34  
Old 06-24-2015, 09:45 PM
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Phil Nelson Phil Nelson is offline
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Quote:
Originally Posted by SwizzyMan View Post
Is there any way I could make my own degaussing coil
Yes. This thread popped up recently:

http://videokarma.org/showthread.php?t=264048

You only need to degauss an old color TV the first time you do the color setup, or possibly when you move it later on. Changing its position in Earth's magnetic field can result in purity problems. My favorite example was my first CTC-11. I had spent hours doing the color setup and thought the picture looked decent:



Then I moved it to a new place in the house, rotated about 90 degrees from the position in which I did the setup. Dorothy's face turned green! And the yellow brick road turned orange and purple around the edges.





Degaussing fixed the problem in about 60 seconds.

Newer color TVs have automatic degaussers that operate briefly when you turn the set on, but that's a convenience feature. Unless you constantly haul your roundies around the house, degaussing should be a once-in-a-blue-moon procedure.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html
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  #35  
Old 06-25-2015, 09:06 AM
DaveWM DaveWM is offline
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https://www.youtube.com/watch?v=RAk9lKv03zA

1:30 covers standard fine tuning. at about 3:45 you can see how the pic can be B&W if not fine tuned right.
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  #36  
Old 06-25-2015, 10:44 AM
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Fine tuning did nothing... I am really confused as to what exactly is wrong.
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  #37  
Old 06-25-2015, 10:57 AM
DaveWM DaveWM is offline
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make sure you are on the correct channel.
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  #38  
Old 06-25-2015, 10:59 AM
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channel 3 correct?
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  #39  
Old 06-25-2015, 12:16 PM
DaveWM DaveWM is offline
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3 or 4 are often the ouputs.

check the fuses for blown power supply after sparking the HV
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  #40  
Old 06-25-2015, 12:30 PM
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Quote:
Originally Posted by DaveWM View Post
3 or 4 are often the ouputs.

check the fuses for blown power supply after sparking the HV
Both fuses are blown hopefully that is all that went wrong...
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  #41  
Old 06-26-2015, 05:29 PM
DaveWM DaveWM is offline
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how do you know you lost HV? did you check with a probe?

exactly what happened, would be good to know the sequence of events.
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  #42  
Old 06-26-2015, 05:37 PM
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Quote:
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how do you know you lost HV? did you check with a probe?

exactly what happened, would be good to know the sequence of events.
Probed it... Nothing and dont hear the high pitched whine. So I noticed my horizontal wasnt right so I tried adjusting the hold. No luck. So then I tried adjusting the horizontal centering, Fixed it until I took my screwdriver out. When I was pulling it out the screw for the adjustments broke off and I got a large purple/blue spark. The HV immediately died. Tried turning it on again nothing. Pulled the chassis back out of the cabinet. Saw the two blown fuses thought it was that apparently not. Then I saw that the power supply fuse was blown and I think that maybe could have caused the problem. Opened up the cage and didnt see any visual damage except for the broken plastic screw that I was trying to adjust.
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  #43  
Old 06-26-2015, 05:44 PM
DaveWM DaveWM is offline
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the horz adj pot has a plastic knob so that should have done nothing.
were you using metal screwdriver? touch the pot and chassis with the metal shaft?
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  #44  
Old 06-26-2015, 05:45 PM
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Quote:
Originally Posted by DaveWM View Post
the horz adj pot has a plastic knob so that should have done nothing.
were you using metal screwdriver? touch the pot and chassis with the metal shaft?
Forgot to mention yes my screwdriver slipped when It broke.
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  #45  
Old 06-26-2015, 05:49 PM
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you measure no HV at the CRT anode (or metal 3A3 tube socket housing)?
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