Motorola roundie

[timmy]

Originally Posted by Yamamaya42

unlocked color :O

http://suzaku.live-evil.org/IMG_1049.MOV

No I know it’s not locked the other pic I sent you is locked the video was if I ran the slug all the way in but it’s back where it was befor ,no advancement here still the same as that pic I sent you. I’m not even sure anymore here should I try to get another oscillator coil I don’t know since it locks and stable with no colors except in the pic.

[timmy]

This is very frustrating not finding anything wrong except the ohms of the oscillator coil wrong or not right colors yet it’s got lock. Did resistance check on v-20-25-24 all are very good. There was a voltage difference between 24&25 going to check again.

[timmy]

I’m going to put this project on hold I decided one way or the other I need to rule out the oscillator coil I have a supplier that may have this coil and a 15pf mica and the 27k resistor that makes up the whole coil and maybe he will have listed in the miller coil book if there were any production changes pertaining to this coil.

[old_tv_nut]

To repeat:

If you complete the AFC procuedure and have lock there is no more to be done in this section.

Please send some close-ups of the color bars with the tint control at both ends and centered and it may be possible to come up with some diagnosis. You have proven repeatedly that the oscillator is not a problem any more.

[timmy]

Originally Posted by old_tv_nut

To repeat:

If you complete the AFC procuedure and have lock there is no more to be done in this section.

Please send some close-ups of the color bars with the tint control at both ends and centered and it may be possible to come up with some diagnosis. You have proven repeatedly that the oscillator is not a problem any more.

The hue only makes the color alittle darker or brighter the intensity further saturates more turning cw. I cannot post pictures since things were changed here on karma I did send a pic of what it looks like now to yamamam42 I can send a pic in an email without a problem. I have done the afc several times already as well. With the ohms higher then it should on the coil I don’t know if this would affect what colors would present.

[old_tv_nut]

Originally Posted by timmy

...With the ohms higher then it should on the coil I don’t know if this would affect what colors would present.

If the oscillator is running and locked, adjusting it cannot cause the problems you are describing. There may be a problem in the hue(tint) control or something else may be misadjusted. Since you do not know how to follow the visual cues to the trouble, your description is insufficient for someone else to do so. Pictures are required.

I thought you found a way to send pics to yamamaya42 so he could post them.

I am sending you a private message to see if you can send them to me.

[Username1]

.





Ok, so I got the video that you guys posted, thanks! I can see the blue, red, & green
colors bars moving through the picture "barber pole" style. This is the burst color
not locked, or in sync with the local 3.58mhz color osc. I have labeled "A" in
my screen shot off your video.... I don't understand the vertical bars in
the picture..."B" Are they produced by the defect with this tv? Will
your signal source make the same bars on a different tv? If they
only show up on this tv..... What happens when you turn down
the color... All the way off to B&W....? Do they go away? If
those bars only appear on this tv, then I'm wondering if
there is possibly something wrong in the burst gate....
Does your color bar generator put some separator
between each color...?

Anyway, maybe it's a good idea to take a breather
from this project for a few days as you said....

To anyone who did not see the video, the blue,
Green, & red bars remain at that 30 degree
angle, but raise upward through the picture
continuously. The vertical bars labeled "B"
remain stationary, and are partially effected
by the colors passing by - as if they are
behind the vertical bars....


Night....

.

[Yamamaya42]

Originally Posted by old_tv_nut

If the oscillator is running and locked, adjusting it cannot cause the problems you are describing. There may be a problem in the hue(tint) control or something else may be misadjusted. Since you do not know how to follow the visual cues to the trouble, your description is insufficient for someone else to do so. Pictures are required.

I thought you found a way to send pics to yamamaya42 so he could post them.

I am sending you a private message to see if you can send them to me.

I was sent a Still pic, but it lacked any descriptive information, so I did not put it up, Old crystal, new? color up full or down, hue full CW/CCW/ or center, just the pics alone wont help much.


What are the status of things when taken?

[timmy]

So I hear the the grid resistors in the demods are super, super critical I don’t know what would be considered to high befor there is a color problem. It almost seems like only one demod is working. If there is no sign of any blue then I would think maybe a problem in v24 I did resistance check and found that pin 7 1.145k should be 1000k pin 7 399 should be 390 ohms.

[Yamamaya42]

The reading of 399 ohms which I will assume was on pin 8, ( you listed pin 7 twice ), is of very little concern, for its common to all Y amps, and comes from R205, and is in tol.

What should be of concern is if the resistance readings for pins 7 on V25/V24 are noticeably different, if they are, then BOTH the 68 ohms resistors should be replaced with a closely matched pair.

[timmy]

Originally Posted by Yamamaya42

The reading of 399 ohms which I will assume was on pin 8, ( you listed pin 7 twice ), is of very little concern, for its common to all Y amps, and comes from R205, and is in tol.

What should be of concern is if the resistance readings for pins 7 on V25/V24 are noticeably different, if they are, then BOTH the 68 ohms resistors should be replaced with a closely matched pair.

I just measured pin 7 on both one is 78 and 79 ohms

[old_tv_nut]

Timmy and I have been chasing his problem via email.
He once got good resistance readings on A17, but no more. Now reading multiple k ohms. Hard to believe that all three windings have opened up, but that appears to be the case. This would kill the blue demodulator.

He has a new A17 on order and meanwhile I have asked him to triple check the readings on A17.

If this fixes the missing colors, then we can proceed on finding the problem with the tint control.

[Yamamaya42]

Originally Posted by old_tv_nut

Timmy and I have been chasing his problem via email.
He once got good resistance readings on A17, but no more. Now reading multiple k ohms. Hard to believe that all three windings have opened up, but that appears to be the case. This would kill the blue demodulator.

He has a new A17 on order and meanwhile I have asked him to triple check the readings on A17.

If this fixes the missing colors, then we can proceed on finding the problem with the tint control.

There seems to be something very odd going on with this Motorola.

[Yamamaya42]

as for Tint, if L32 is bad, there is a replacement,

https://www.vivatubes.com/nos-nib-vi...id-8-2-uh-rfc/

as listed in SAMS.

[Yamamaya42]

Definitely in the The Twilight Zone with the development, if what he is reading is correct.

The only thing I can picture happening is, A17 was acting up from the start, and the cause of the old crystal to not work, or, something went VERY wrong when it was adjusted for maximum reading, like the entire coil turned, and tore wires perhaps?

Timmy's last voltage check of pin 6 V23 (PLATE) was at 189v, should be 220v, a tad low, from a 275v source, via a 8.2k resistor and through the 5.2 ohm coil, I would suspect if the coil was open when this was taken, it would be much lower than 189v? :O