Motorola roundie

[Username1]

With no voltages on pins 1 & 2, you have to go back one stage and see what's going on.
Measure voltages at the tube, Check A19 connections, & resistance measurements.
Also since you had color at one point, have you checked the "plug & Socket #1"
to be sure there is no corrosion, or bad pin connections? Please post all
the voltages at V21, not just they are ok or anything like that......
How about voltages at V19 as well..... Also - this may be a long
shot, but just for fun, when you put yer meter on AC Volts
does it register anything on pins 1 & 2 of the V22 tube?
As in Pin 1 & Ground, & Pin 2 & Ground.....



Thanks.....
Good Night.......



..

[Yamamaya42]

IF you do not find any other wrong voltages when doing the above suggested tests.

now that you have the cores unstuck, try these steps and see if it makes an improvement.

http://suzaku.live-evil.org/mot-afc.png

[timmy]

Where is this plug and socket #1 looks like 2 wire plug. Ok it’s on the big plug in the rear of chassis. The plug is good and clean and completely pushed in and no wires are coming out of the plug from pushing it in. As it stands now the hue and intensity have no effect at all when turned. After I fixed the bad slug problem I already tried the AFC procedure and all I got was turned both ways produced either rainbows or the rainbows disappeared so I put the slug back where it was.

[Yamamaya42]

if you went through all those steps posted above, exactly as listed, and got no results, there is indeed another fault someplace.

[timmy]

Originally Posted by Yamamaya42

if you went through all those steps posted above, exactly as listed, and got no results, there is indeed another fault someplace.

Voltage is present for the oscillator so it is running but turning the slug changes things obviously but no matter where I turn it still got rainbows so going to do voltages again and I’ll post them.so as long as the oscillator is running I don’t have to touch A17

[timmy]

Here’s the voltages
V21. I probed the wrong side of v22 it does have voltage. I missed B section of v19 I’ll post the voltages
1 180.6
9 -44
6 352.3
3 123.7
7 180.2
2 123.3

V23
1 38.14
9 -1.138
8 2.489
6 189
3 114.9
2 -.382
V19
6 189
3 220
2 -744
7 .534
V22
1 5.35
2 -4.70

[timmy]

V19 B section 1 95.6 9 -40.7 8 5.86

[Yamamaya42]

Originally Posted by timmy

Voltage is present for the oscillator so it is running but turning the slug changes things obviously but no matter where I turn it still got rainbows so going to do voltages again and I’ll post them.so as long as the oscillator is running I don’t have to touch A17

error-

Measurement taken with color killer full CW ( not sure about that ) and tint in center, with clolor bar generator input on tuner.
TV set for normal color operation, it says “short pin 2 of burst amp V21 to ground.

Then to look at the voltage of the phase det pin 1 with a volt meter through a 47k resistor, this is as to not load it down, if no reading, oscillator is not running, adjust A18 to start, then adjust A17 for max reading.

Do NOT skip that step.
If you see a reading at pin 1 V22 through a 47k with pin 2 of burst amp V21 shorted to ground as the procedure says to do, move on to adjust A17 for max reading.

Then go to next step.

[timmy]

Originally Posted by Yamamaya42

error-

Measurement taken with color killer full CW ( not sure about that ) and tint in center, with clolor bar generator input on tuner.
TV set for normal color operation, it says “short pin 2 of burst amp V21 to ground.

Then to look at the voltage of the phase det pin 1 with a volt meter through a 47k resistor, this is as to not load it down, if no reading, oscillator is not running, adjust A18 to start, then adjust A17 for max reading.

Do NOT skip that step.
If you see a reading at pin 1 V22 through a 47k with pin 2 of burst amp V21 shorted to ground as the procedure says to do, move on to adjust A17 for max reading.

Then go to next step.

What would max reading be because I did use the 47k resistor and It was alittle over 5 volts. Adjust A17 for max voltage?sams says max deflection?

[timmy]

Ok still no difference still got a screen of rainbow colors and did the whole afc and A17 if it’s voltage to max it is already it’s at 4.40v won’t adjust any higher it will go lower. Could there be a problem in the demods?

[Yamamaya42]

Originally Posted by timmy

Ok still no difference still got a screen of rainbow colors and did the whole afc and A17 if it’s voltage to max it is already it’s at 4.40v won’t adjust any higher it will go lower. Could there be a problem in the demods?

no, it would not be the demods,95% chance its a problem with the osc circuit, including A18, and the previously broken and replaced core, these are all symptoms of it not being able to be tuned into the correct range.

If you had a frequency counter or oscilloscope you could verify that it is at or near 3.57954 MHz but if its unable to get there due to come fault like in the coil, you will never get the color to lock in.

[timmy]

Originally Posted by Yamamaya42

no, it would not be the demods,95% chance its a problem with the osc circuit, including A18, and the previously broken and replaced core, these are all symptoms of it not being able to be tuned into the correct range.

If you had a frequency counter or oscilloscope you could verify that it is at or near 3.57954 MHz but if its unable to get there due to come fault like in the coil, you will never get the color to lock in.

Ok well the core ferrite was the same size as the old one but I noticed that on the oscillator coil there is a resistor that’s good and a 15pf mica that I can’t check it’s range is to low for me to check and also a 220pf mica at v23 one or both could be bad keeping it from reaching the correct frequency

[timmy]

Well I have 3 5pf micas I could put in parallel to make 15pf to see if this corrects a possible coil problem. Have to take the coil out again to reach the cap.

[Yamamaya42]

Originally Posted by timmy

Well I have 3 5pf micas I could put in parallel to make 15pf to see if this corrects a possible coil problem. Have to take the coil out again to reach the cap.

the cap is very unlikely to be at fault, it could be that the core it's self may be slightly different in composition density, ( guess ) , you won't know for sure until you can see where it's oscillating at, at if it at the desired freq.

[timmy]

Originally Posted by Yamamaya42

the cap is very unlikely to be at fault, it could be that the core it's self may be slightly different in composition density, ( guess ) , you won't know for sure until you can see where it's oscillating at, at if it at the desired freq.

I have seen micas go bad and drift up so if this coil is that critical then the mica has to be right and it is in an oscillating circuit which bangs around capacitors and there is the 220pf as well. I don’t know how far a mica can drift befor if just won’t work in this coil. I found nothing else in and around v21 that is bad.and these rainbows is a direct cause of the oscillator being out of frequency there is nothing else that would hint to making rainbows and or not locking in.