Trio R-600 Receiver Fault

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sickboy
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Trio R-600 Receiver Fault

Post by sickboy » 19 Jun 2017, 20:21

This is driving me mental...

A pal bought an old R600 receiver which was sold as working, but it turns out it has a fault. The minimum the VFO will go to in any band is 282, meaning that every band has a gap which you can't access.
From going through the PLL section adjustments in the service manual, it seem like it's a VFO tracking fault. The manual states that with the VFO fully clockwise (maximum), pin 5 of Q17 should give a frequency of 2.479MHz which it does. All good so far.
Then turn the VFO fully anticlockwise (minimum) and I should have a frequency of 3.599MHz - but I actually have 3.251MHz. Adjusting TC2 (variable cap) doesn't bring it much higher, although turning it lower does make the fault (or the gap) worse, so I'm definitely on the right track.

I just spent the afternoon doing a full recap on both boards (over 60 caps) but the fault is exactly the same. I've also tried replacing TC2 itself but no joy.

Does anyone have any experience of these receivers?
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Admiral
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Re: Trio R-600 Receiver Fault

Post by Admiral » 21 Jun 2017, 13:06

Sorry, I'm no use as you already stole my thunder, my R-600 is spot on frequency but it's as deaf as a post, a friend had a look and says it needs recapping, way too big a job for me and uneconomical to pay someone else to do it on a low value set.
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Re: Trio R-600 Receiver Fault

Post by sickboy » 21 Jun 2017, 13:30

Admiral wrote:Sorry, I'm no use as you already stole my thunder, my R-600 is spot on frequency but it's as deaf as a post, a friend had a look and says it needs recapping, way too big a job for me and uneconomical to pay someone else to do it on a low value set.
Yeah it was around £25 for the kit and took a few hours to do. It's beyond my technical ability to diagnose the fault, so my friend is now sending it down to Dave Wood in Wales for repair.
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Re: Trio R-600 Receiver Fault

Post by kilimax » 21 Jun 2017, 18:23

sickboy wrote:
Yeah it was around £25 for the kit and took a few hours to do. It's beyond my technical ability to diagnose the fault, so my friend is now sending it down to Dave Wood in Wales for repair.
So it will be "Dave tuned" then! :D
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Re: Trio R-600 Receiver Fault

Post by Admiral » 21 Jun 2017, 18:28

If anyone wants a deaf R-600 for a bullseye you know where to come.
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Re: Trio R-600 Receiver Fault

Post by Tim » 21 Jun 2017, 19:44

Attach a long chain to it and sell it on eBay as a boat anchor. ;)

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Re: Trio R-600 Receiver Fault

Post by Admiral » 21 Jun 2017, 19:47

It's not quite that bad, solid state, but the old school built in linear PSU forms 80% of the weight.
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Re: Trio R-600 Receiver Fault

Post by teddyt » 21 Jun 2017, 20:20

That's a shame Admiral as it looks a nice set. if you ever want to donate it?......... ;)
I had an old yaesu fdr 400 boat anchor that was the same deaf and almost dead, there's a guy in my club who loves to re-biuld old valve stuff, so I gave it to him to playwith/ use as parts??? As I had no idea how to repair it and was not worth the cost of repair :cry:

anyway this gent said when it's done I can have it back :o :o Said I would pay for parts/ time etc, but he said he just likes to play!!
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Re: Trio R-600 Receiver Fault

Post by Admiral » 21 Jun 2017, 20:28

Well if sickboys mate finds it uneconomical then it may be up for grabs cheap as I officially retire on July 25th and am moving back to MK, so the less crap the better.
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Re: Trio R-600 Receiver Fault

Post by dg1ypg » 22 Jun 2017, 09:56

Admiral wrote:.....but it's as deaf as a post.....
Did you check the 0,1A-fuse on the rf-board close to the ant-terminal?

This fuse is in the antenna-line, if it is blown the set will be deaf on both terminals!


55 + 73 - Paul

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