Products > Test Equipment
Advance Instruments TC8 - Only counts
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bance:
Yes the way the site is set up is a bit strange, but I was surprised at how quickly Dave responded...

My unit had a faulty Pass transistor in the power supply, which I changed, that gave me a display, but it still wouldn't count. I found that there is an intermittent fault on the voltage attenuator switch,
but it's a PITA to get to it so I've set it aside for the moment.

I think I'll have another go at it soon....

Steve.
pwarren:
Well, the 10MHz reference crystal does put out a signal, see picture.  It looks Ok, but is not exactly aligned, which could be either the scope, or the counter, both are very old, not used for ages pieces :)

But I'm wondering if it's just going to be easier to buy a slightly more modern counter. I'm going to be using it to assist in building amateur radios, and I've a lot to learn before I'm comfortable diagnosing and fixing the counter!
bance:
It would be easier, definitely, but you might learn a heck of a lot by trying to fix it.

The people on this forum are great, and I'm sure you'd get a lot of support from them.

Since you got the counter for free you don't have a lot to loose by giving it a go, except time maybe.

Have a look at the trouble shooting section in the manual, it should give an idea of where to start.

HTH Steve.

PS. maybe edit the title of the post/ make a new post to reflect what you're trying to do!
pwarren:
Well, I know it's been a while, but I've learned enough now to diagnose it properly, and found that the fault is in at least IC11 and probably all the way through to IC17, the decade count ICs.

They're 69-959-79 Fairchlid 24095 ICs, which I've not been able to find out anything about :(

So, I've got myself a slightly newer, reasonably cheap 50MHz counter which will do for a while!

And wow, I didn't realise I posted this nearly 2 years ago! I've certainly increased my knowledge a little since then!
Chelle:
Hi, I found this post because I've just bought the same model counter and looking for a manual and diagrams for it.
The link for the manual above does not work any longer, anyone have a copy?
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