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Old 10-30-2007, 01:13 AM   #1
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1977 31' Sovereign
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1977 clock replacement

I am wanting to replace the digital clock located in the top front storage cabinet. Ours is fried but not sure where to start looking for another.
Anyone have any suggestions?
thanks
Wayne
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Old 10-30-2007, 07:31 AM   #2
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Factory optional digital or round type? I've seen one digital on ebay years ago and have seen several of the regular clocks on there as well.
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Old 10-30-2007, 07:59 AM   #3
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This one would be cool. I think I will add one to the Minuet when I move the radio.

ThinkGeek :: LED Binary Clock
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Old 10-30-2007, 08:17 AM   #4
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When I replaced the old fashioned clock in my A/S I went to a clock store and they were able to replicate something that would work in my coach. At the time, they offered to do something in digital and I opted for the original look. The reason I post this is because you might want to go to some clock stores and see if they can help you out.

Steve
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Old 10-30-2007, 08:21 AM   #5
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Anybody has any ideas for replacement insruments for my 71 Tradewind? Especially round instruments that are the same diameter as the originals. What was in my now empty holes in the control panel was an indoor outdoor thermometer and a barometer.
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Old 10-30-2007, 08:41 AM   #6
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The LED clock in my '77 was DOA and I REALLY wanted it to work - Good luck on the search for a 12v replacement, I had no luck. I did find the reason mine quit and was able to repair it. The power supply on the board is a dropping resistor and a 9V zener diode. The zener had shorted and burned out the dropping resistor. I replaced both with a 7809 power supply chip and it's been glowing ever since. I think I did a thread titled "Mine Glows"
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Old 10-30-2007, 05:23 PM   #7
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1977 31' Sovereign
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Mine did the same

Vernon,
I really think my clock died the same way.
If I can take a picture of the circuit board, do you think you could tell?
I know I have a burnt resister, from the look on the board. I was checking for ohms on the one in question and it is fried. I am really excited about this possibility of fixing the old thing. I am not an electrician by any stretch but my father was, boy could I use him now. But I did pick up a few things watching him over the years. I am pretty good with a soldering gun anyway. Maybe there is still hope for this clock.

PS Vernon, you mention a power supply chip but in on place you say its a 7809 and in another 7812.
Does this matter?
thanks
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Old 10-31-2007, 08:43 AM   #8
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I'll have to pull my clock and verify but I remember the Zenier being a 9V unit, thus the 7809 brain cells bumping together . If you have a chance, post a photo of your P.C. Board and I'll try to pull mine and work up a method to check out yours. It might be a good thing for other members in the same situation.

I do recall the main clock chip is NLA but some surplus companies still have stock - at over $150 each
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Old 10-31-2007, 09:10 AM   #9
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Here is a quick sketch that may help you. The dropping resistor is easy to find, ts pretty much one of the first components after the 12v in and will probably should show 'open'. The zenier will be just after and will probably show '0' ohms in both directions. I removed them both and added the 7809 with some hot glue and jumpers (no filter caps at all!)
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A honkin' long 34' named AlumaTherapy http://www.airforums.com/forums/f205...num-54749.html
and a 26' '63 Overlander, Dolly http://www.airforums.com/forums/f109...ome-71609.html
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Old 10-31-2007, 11:16 PM   #10
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1977 31' Sovereign
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clock circuit board

Okay here is the board. My pencil points to the fried resister I think. Is The open diode just below the yellow 12v line coming in,(just to the right of the pencil lead on the first picture?
Again I appreciate the help.
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Old 11-01-2007, 09:18 AM   #11
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I just made a note in my 2do list to pull my clock and get some photos. If I don't get it tonight it may be next week.

From the looks, someone has already done some tweeking on your clock, hopefully we can get it going.
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Old 11-01-2007, 10:05 AM   #12
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Wayne,

After looking at your photo, it appears that whoever did the prior repair had less experience at repairing electronics that yourself . Since the diodes are simply a clamp device with the resistor being the current limiter, the 3 diodes in parallel (wrapped around each other) means they will quit working when just one diode fails.

There is good news in that all of the parts can be replaced to make your clock work again.

-thomas
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Old 11-01-2007, 12:07 PM   #13
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Quote:
Originally Posted by tschat
Wayne,

After looking at your photo, it appears that whoever did the prior repair had less experience at repairing electronics that yourself . Since the diodes are simply a clamp device with the resistor being the current limiter, the 3 diodes in parallel (wrapped around each other) means they will quit working when just one diode fails.

There is good news in that all of the parts can be replaced to make your clock work again.

-thomas
Assuming they are zeniers
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Old 11-01-2007, 02:23 PM   #14
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1977 31' Sovereign
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clock repair

thanks for looking into this.
I will wait for further instructions.
Now I know why the clock was removed from the cabinet and layinng inside of it. "Joe", the guy who sold me the trailer must have thought he could fix it at one time and apparently reached the limits of his expertise. Anyway, so have I, so you all are gonna have to carry the load to have a chance it will run again.
thanks
Wayne
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