60's color motorola

[DaveWM]

sorry got behind did not see you got the HV going.

[old_coot88]

What he jumpered was the surge protector thermistor in the AC line coming in.

Just curious, what does the schematic show for the degausser?
On the Motos that I remember (Moto was not our house brand, so we didn't service many of them), the degausser was some kinda strange thermal 'relay' device mounted on the front chassis apron. The part was reputedly very troublesome, though we never had occasion to replace one.

Or does this set use the standard thermistor/varistor setup?

[Electronic M]

If the HV crackles loudly for more then 10 seconds after power up then something is arcing and that arcing will need to be fixed.

[bgadow]

Has the set been stored in a dry place? If damp you could be getting some corona from that, no big deal really. I suspect the noise is normal, can be caused by excessive dust though this one seems pretty clean. Hard to say for sure without being there in person. I would normally just stand back and let it go, see what happens. Have one hand near the power switch, just in case. Remember, it won't jump up and attack you-the worst that can happen is something will fail. I'll say, I think this is a desirable set. An attractive design, to my eyes, and I think Motorolas have lots of character. If you can't figure it out, don't junk the set. Somebody else on here would love to have it, I'm sure.

[DavGoodlin]

Nice set there. What is the number of the replacement CRT in there? Just Curious.

That thermistor is not required but helps your set's components last longer by limiting inrush current to the transformer.
A type CL-60 thermistor will carry 5 amps and can be used in place.

BTW my first repair, to my childhood TV a 1962 Motorola 19" BW, went exactly like this;
mystery part open= thermistor, hissing crackles=arcing high voltage

Good Luck, Id have driven hours for a set like that too

[rob Cashin]

the set is pretty dusty inside, and it was actually in the old owners living room all of its life until i got it. Im gonna brush the dust out and give it a go when the comes up...

[rob Cashin]

sun comes up... 5:15 is too early on a sunday

[rob Cashin]

heres some good news guys... i turned up the brightness, turned up the sound a little, cleaned the controls and all the dust, cross my fingers plugged it in and got..................... a nice bright screen with snow and sound

Hurray!!!!!! You got a good one!

[rob Cashin]

i hooked it up to the dtv converter box, it does get a picture but its black and white?

[rob Cashin]

well... i turned the color killer on the back of the set a little, turned it on and i had some color when it came on, but it cracked the screen tinted green and i shut it off. looks like its gonna need some work after all

[dieseljeep]

Originally Posted by old_coot88

What he jumpered was the surge protector thermistor in the AC line coming in.

Just curious, what does the schematic show for the degausser?
On the Motos that I remember (Moto was not our house brand, so we didn't service many of them), the degausser was some kinda strange thermal 'relay' device mounted on the front chassis apron. The part was reputedly very troublesome, though we never had occasion to replace one.

Or does this set use the standard thermistor/varistor setup?

The little later model TS908 used the thermal relay. The set in this thread uses the push-button deguasser, located near the antenna terminals. It was kind of a strange circuit, that used the boost source. There was an AC capacitor in series with the coil.

[Electronic M]

Originally Posted by rob Cashin

well... i turned the color killer on the back of the set a little, turned it on and i had some color when it came on, but it cracked the screen tinted green and i shut it off.

The CRT cracked?

[rob Cashin]

*******crackled and hissed like something was burning up. sorry typo. i didnt smell smoke though but im sure something fried. it only did it though when i shut it off and adjusted the color killer and turned it back on.

[old_coot88]

Originally Posted by rob Cashin

*******crackled and hissed like something was burning up. sorry typo. i didnt smell smoke though but im sure something fried. it only did it though when i shut it off...

Sounds normal if it's a transient 'crackle' lasting a second or two. As the High (positive) Voltage inside the CRT drops rapidly to zero, a negative-going charge is coupled capacitively to the outside of the CRT glass.

...and turned it back on.

Again, normal if the crackle lasts only a second or two. As the HV comes up, a positive-going charge is coupled capacitively to the outside of the CRT glass.
If the hiss/crackle continues while the set is running, that would indicate a problem.