60's color motorola - Page 4 - Videokarma.org TV - Video

rob Cashin · #46 12-22-2013, 03:25 PM

any idea how to get some color on the screen? LOL i dont want to touch anymore adjustments til' im sure

DaveWM · #47 12-22-2013, 04:16 PM

aside from turning the color level knob CW, fine tuning can have a great effect on color reception. Typically you tune CW until you get sound interference on the screen then back off just until it goes away. You can crank the color killer fully CCW.

If you are not getting any color snow with the color killer fully CW (you should be able to see BW snow and color snow by adjusting the color killer), then you prob need some tubes in the color circuit. maybe a dead color osc tube for starters. I would just sub in some new tube in the chroma circuits, starting with the osc.

rob Cashin · #48 12-22-2013, 04:26 PM

yea i tried the color killer both ways and didnt get any color. i dont know where the sets fine tuning is or if it even has one. I need 3 bulbs for the set, it has the projecting controls and they all are dead. Ill look around, i may or may not have some tubes that will work in this. will adjusting the individual colors make a difference? i have no idea if anyone has ever toyed with any of them

Username1 · #49 12-22-2013, 05:06 PM

Fine tuning should be the outer ring of the VHF tuner knob... And no you should not adjust individual color knobs at this time.... You can, with the set off, pull out any tube with "color" in its description from the tube chart, and put it back in. That will kinda clean some oxide off the pins, might get color flowing again..... Be careful....

rob Cashin · #50 12-22-2013, 05:12 PM

there is no fine tuning ring... its just a vhf and a separate (i think because the bulbs are blown projector dials) uhf tuner. neither of them have fine tuning. the front panel has hue, intensity, pull on push off twist volume, vertical, bright, tone and contrast... im cleaning up all the controls and all the tube sockets.. i still dont know what will even happen if its on for a minute or 2... ill find out soon.

#51 12-22-2013, 05:59 PM

Do you push in on the knobs and twist to fine tune?

rob Cashin · #52 12-22-2013, 06:37 PM

thank you....

rob Cashin · #53 12-22-2013, 07:23 PM

i cleaned all the tube sockets, played with the fine tuning and still no color

.. would letting it run for more than a minute or 2 make a difference?

rob Cashin · #54 12-22-2013, 07:29 PM

i want to add this as well... if i switch the service switch in the back i get a nice line of red green blue across the screen. im lost

#55 12-22-2013, 08:05 PM

Do you have a way to hook up a signal source like from a VCR?

Here's an ad from Sep. 1964 when Motorola introduced these sets:
http://books.google.com/books?id=-Eg...eranto&f=false

rob Cashin · #56 12-22-2013, 08:11 PM

i have a vcr dvd combo set to it now.... still no color.. only color when the service switch is flicked... i know you cant tell in the picture but its a perfect RGB line through it

Electronic M · #57 12-22-2013, 08:27 PM

The service switch is not producing color video. All it does is disable the vertical deflection. When you flip the service switch you should have a single white line if your convergence is not mis-adjusted(Which it likely is since you are seeing RGB lines).
Also do not run the set with the service switch in the position pictured for more than a couple of seconds without the brightness control turned down or you will PERMANENTLY burn those lines in to your screen.
I'd ignore the service switch and convergence until you get your color back as those adjustments should not have affect on your lack of color.

Btw is this your first time working on a tube color set?

rob Cashin · #58 12-22-2013, 08:36 PM

this is my first time working on a color set. i didnt leave the set on more than 20 seconds with the switch flipped. im out of idea for the color. i guess it is what it is!

Electronic M · #59 12-22-2013, 08:57 PM

Get a schematic, a test pattern DVD, and an oscilloscope and start comparing waveforms in the color circuits to those shown on the schematic.
Once you get good at signal tracing the problems that can stump you will be far fewer in number.

Username1 · #60 12-22-2013, 09:41 PM

Actually, if you hook up your DTV box, then set the tv to channel 3 and get a B&W picture, you should verify that your fine tuning knob is actually working..... Can you fully de-tune the channel you are getting a signal from...? 3, or 4, whatever you are using..... And you should get past the leaving the set on for only 30 seconds.... Some of these old sets need a few minutes for the color to work, If it comes on after a few minutes, that's a clue to fixing it....