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 Post subject: RCA GB 685 H
PostPosted: Nov Mon 13, 2017 10:13 pm 
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Joined: Nov Mon 13, 2017 10:05 pm
Posts: 5
I just picked up an old RCA GB 685 H
Looks to be manufactured February 1978.
Plug it in nothing happens with turning any knobs or switches.
Can someone more knowledgeable point in the direction of some resources.
What do I start with.


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Tue 14, 2017 5:42 pm 
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Posts: 6190
Gstutz94 wrote:
What do I start with.
First, welcome to the forums.

Like with any journey, getting to a destination (in this case a working TV) depends on where you start from.

Giving people here some background on your possible capabilities, experience, and electronics test equipment that you bring to the party is kind of important.

In the mean time, I found something you may need in the process; documentation on what is in your TV.

Your TV is in Sams Photofact Folder 1703-1 as shown below. This documentation is available for sale as shown. I did not see any free online versions, but they may exist.
Attachment:
SAMS_1703-1.jpg
SAMS_1703-1.jpg [ 111.91 KiB | Viewed 517 times ]
Curtis Eickerman

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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Tue 14, 2017 8:10 pm 
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Joined: Nov Mon 13, 2017 10:05 pm
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I've more experience in Automotive electronics DC. Though given some time I think I can mostly figure out a detailed schematic if I have one. I mostly only have a typical good quality multimeter. Though whatever tools I need then I just need to get it. I'm more or less familiar the basics of radio technology, i.e transistors, capacitors, inductors and such though I definitely have a very long way to go.
My chassis is a CTC-86.
And yes I'm aware of the high voltage potential though not certain on what is the best way to discharge it without getting lit up like a Christmas tree.
Though as it's been sitting non operational close to I'd say 10 years I doubt it's still to hot but better safe than sorry.

It's dead in the water, no glow no clicking no static in the speaker, no nothing just dead.


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Tue 14, 2017 10:47 pm 
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Gstutz94 wrote:
Though as it's been sitting non operational close to I'd say 10 years I doubt it's still to hot but better safe than sorry.
Where is you spirit of adventure? :shock:

Seriously though, I have a very long screw driver that I alligator clip lead to the chassis. Then touch the end of it to the HV lead to make sure things are discharged.

With that, I will bow out. There are others here who are much better equipped to help you with TV troubleshooting than I am. I am more of a radio guy.

Best of luck.

Curtis Eickerman

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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Tue 14, 2017 10:49 pm 
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Joined: Nov Mon 13, 2017 10:05 pm
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Thanks


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Tue 14, 2017 11:09 pm 
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Joined: Apr Sat 06, 2013 2:18 pm
Posts: 308
Location: New Hampshire
Next step is open it & take a good chassis picture ( nudie ) & post it.
That way everyone that worked on then years ago will remember it.

IF its the set I am thinking it is there are a few easy fixes if you are lucky.
1) popped breaker. Little red button sticking out the back.
2) bad on off switch
3) bad AC cord !
4) thermistor behind chassis that falls apart.

good luck
Zeno 8)
LFOD !


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Wed 15, 2017 5:28 pm 
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Joined: Nov Mon 13, 2017 10:05 pm
Posts: 5
Well it won't let me upload a picture says it's too big. So far I've checked the cord, good 120v, the 4 diodes on the power board, all good, and the fusible resistor .1 ohm. Only thing left is it says there's a fuse on the board. I'm not familiar with what it might look like. Though I do have a little red disc soldered into the board it shows OL. Would that be my fuse?
Number on it is General Electric 773-1 and then it says x7


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Wed 15, 2017 11:44 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5152
Location: Woodinville, WA USA
Gstutz94 wrote:
Well it won't let me upload a picture says it's too big.
You can use an art program like Microsoft Paint to resize your photo to 800x600 pixels or smaller.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Thu 16, 2017 3:02 pm 
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Joined: Nov Mon 13, 2017 10:05 pm
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Ive found the problem. It's got a bad power switch


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 Post subject: Re: RCA GB 685 H
PostPosted: Nov Thu 16, 2017 4:26 pm 
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Joined: Apr Sat 06, 2013 2:18 pm
Posts: 308
Location: New Hampshire
Some RCA on/off switches can get stuck half way mechanicly. You can see it from the outside
if so. Just give it a push.........
BTW I pulled the Sams & yours was a short lived chassis. Saw only a hand full
unlike other RCA's that we saw by the 100's. It was the last modular set they built.

73 Zeno
LFOD !


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