Trio R-600 Receiver Fault
- sickboy
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Trio R-600 Receiver Fault
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?
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
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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- sickboy
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Re: Trio R-600 Receiver Fault
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.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.
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- Auldgeek
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Re: Trio R-600 Receiver Fault
So it will be "Dave tuned" then!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.
Auldgeek - Drew
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I've changed radios so many times, I've forgotten what I have
Winner of IBTL Autumn 23 Edition
I've changed radios so many times, I've forgotten what I have
- Admiral
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Re: Trio R-600 Receiver Fault
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
Attach a long chain to it and sell it on eBay as a boat anchor.
- Admiral
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Re: Trio R-600 Receiver Fault
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
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
anyway this gent said when it's done I can have it back Said I would pay for parts/ time etc, but he said he just likes to play!!
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
anyway this gent said when it's done I can have it back Said I would pay for parts/ time etc, but he said he just likes to play!!
Baofeng UV82, Standard c5200ed, Icom lc-ft1610, Realistic pro-26, Trio 9r-59ds, Yeasu frdx 400, Realistic pro-2004, Yeasu ft-767gx and has the 2m, 70cms and 6m modules fitted, Yaesu FT 980,KT-8900d Quad Band, Trio,Baofeng GT-3tp, TYT MD380, Yaesu FT450D
- Admiral
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Re: Trio R-600 Receiver Fault
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
Did you check the 0,1A-fuse on the rf-board close to the ant-terminal?Admiral wrote:.....but it's as deaf as a post.....
This fuse is in the antenna-line, if it is blown the set will be deaf on both terminals!
55 + 73 - Paul