Hello all,
My Denon TU-580RD has this problem:
www.youtube.com/watch?v=3SAzJ_kTssc
On some stations it "jumps" or mutes all the time whereas other tunes do not. You can see the RDS and Tuned indicators flickering all the time. Happens only with it. Very, VERY annoing.
Signal strenght is high.
???
My Denon TU-580RD has this problem:
www.youtube.com/watch?v=3SAzJ_kTssc
On some stations it "jumps" or mutes all the time whereas other tunes do not. You can see the RDS and Tuned indicators flickering all the time. Happens only with it. Very, VERY annoing.
Signal strenght is high.
???
DenonTuner Problem
Simply u can solve this problem, and fix it.
This is a simle drift problem.
First u must have a screwdriver. Then open the top cover of the tuner.
On the PCB u will see an IC (IC1-LA 1235), and two adjacent adjustable coils next to LA 1235. By means of an alignment (non-magnetic) tool preferably, or a precision screwdriver just turn the ferrite core (mute on, tuned to a well known frequency) first CW and then CCW slightly, when tuned and stereo indicators are satable then leave the ferrite core just in the midpoint of your
adjustment.
That's all.
Simply u can solve this problem, and fix it.
This is a simle drift problem.
First u must have a screwdriver. Then open the top cover of the tuner.
On the PCB u will see an IC (IC1-LA 1235), and two adjacent adjustable coils next to LA 1235. By means of an alignment (non-magnetic) tool preferably, or a precision screwdriver just turn the ferrite core (mute on, tuned to a well known frequency) first CW and then CCW slightly, when tuned and stereo indicators are satable then leave the ferrite core just in the midpoint of your
adjustment.
That's all.
Whoa!! 🙂
I saw your reply only now!! 😉
Here below we have a big picture from the internet (not my unit!!).
An externally hosted image should be here but it was not working when we last tested it.
You mean the IC in the middle circled in red where there is one coil missing, right?
Does it worth a recap? This little tuner sounds good, but it's a 1991 unit! 😕
If there is only one coil then just adjust the way I described. It is a good tuner, I have more than 250 tuners, and TU580RD is one amongst, it is worth to do recap also, good machine 🙂
Denon TU-580RD, a quick upgrade...
Ok, I had some free time this afternoon and some spare parts (caps) so I decided to open my unit to see what's in that could be replaced...
The whole little board in my TU-580RD. Amazing how good sounding this tuner can be.
I had 8 capacitors in total replaced. Five of them were 1uF 50V electrolytics...
Original power cap is a 2200uF 35V... I had an Elna 3300uF 42V around that now replaces the first...
A new 1uF 100V replaces the original 1uF 50V at PSU section...
Ok, I had some free time this afternoon and some spare parts (caps) so I decided to open my unit to see what's in that could be replaced...
The whole little board in my TU-580RD. Amazing how good sounding this tuner can be.
An externally hosted image should be here but it was not working when we last tested it.
I had 8 capacitors in total replaced. Five of them were 1uF 50V electrolytics...
An externally hosted image should be here but it was not working when we last tested it.
Original power cap is a 2200uF 35V... I had an Elna 3300uF 42V around that now replaces the first...
An externally hosted image should be here but it was not working when we last tested it.
A new 1uF 100V replaces the original 1uF 50V at PSU section...
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Denon TU580 Tuner
Ok.
U have done as I see. But sorry for the inconvenience hence I can not spend much time here. If U have further questions, I will be happy if I can. Well done 🙂
Ok.
U have done as I see. But sorry for the inconvenience hence I can not spend much time here. If U have further questions, I will be happy if I can. Well done 🙂
Ok, I had some free time this afternoon and some spare parts (caps) so I decided to open my unit to see what's in that could be replaced...
The whole little board in my TU-580RD. Amazing how good sounding this tuner can be.
An externally hosted image should be here but it was not working when we last tested it.
I had 8 capacitors in total replaced. Five of them were 1uF 50V electrolytics...
An externally hosted image should be here but it was not working when we last tested it.
Original power cap is a 2200uF 35V... I had an Elna 3300uF 42V around that now replaces the first...
An externally hosted image should be here but it was not working when we last tested it.
A new 1uF 100V replaces the original 1uF 50V at PSU section...
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Well done it seems 🙂
Denon TU-580RD tuner
Hello!
New pictures here of my recent recap/upgrade of this nice sounding tuner.
Many thanks to panelist JohnC at FM Tuner Info, who provided great support to this, based on his TU-380RD (schematics) and TU-650RD (the American version of our TU-580RD) units which is a bit similar to TU-380RD. (If anybody has the schematics of the TU-580RD, we'd appreciate to have a copy, if possible.)
The recap/upgrade was done in the power supply section, in the front end varactor (C5 cap), around the composite section (C27, C28), MPX decoupling (C38), a new OpAmp (OPA2134UA smd) as the audio output buffer plus its decoupling C40 cap, another decoupling cap (C24), and the two large MKP 3.3uF caps at line out, instead of stock 1uF.
-----------------
Below, the main board with new caps. Other than main larger Elna PSU cap (3,300uF/42V), also C123 - nearly unseen, right after the rectifiers - went from stock 1uF/50V to 2.2uF/50V.
New caps at regulated PSU (at right) replace the stock ones. Original C99 was ~84uF, too low.
Below, C43 and C44 line out caps (now 3.3uF, MKP type), and C40 cap for opamp decoupling was 47uF/16V, now 150uF/25V.
Opamp OPA2134UA replaces stock JRC4558 in IC3.
Below, the composite and MPX sections were upgraded in capacitance:
C27 - new 56uF/50V + 0.056 Polypropylene bypass (stock value 22uF/16V)
C28 - new 100uF/25V + 0.056 Polypropylene bypass (stock value 22uF/16V)
C38 - new 220uF/35V (blue BC Vishay) replaced the stock 220uF/16V, which measured ~203uF.
C5 for the front end varactor went from 10uF/16V to 22uF/35V.
Tuner is on since yesterday, non-stop. Sound is really nice with tighter bass and better soundstage. Vocals are more accentuated. I'll leave the tuner on for another day...
Again...
Hello!
New pictures here of my recent recap/upgrade of this nice sounding tuner.
Many thanks to panelist JohnC at FM Tuner Info, who provided great support to this, based on his TU-380RD (schematics) and TU-650RD (the American version of our TU-580RD) units which is a bit similar to TU-380RD. (If anybody has the schematics of the TU-580RD, we'd appreciate to have a copy, if possible.)
The recap/upgrade was done in the power supply section, in the front end varactor (C5 cap), around the composite section (C27, C28), MPX decoupling (C38), a new OpAmp (OPA2134UA smd) as the audio output buffer plus its decoupling C40 cap, another decoupling cap (C24), and the two large MKP 3.3uF caps at line out, instead of stock 1uF.
-----------------
Below, the main board with new caps. Other than main larger Elna PSU cap (3,300uF/42V), also C123 - nearly unseen, right after the rectifiers - went from stock 1uF/50V to 2.2uF/50V.
An externally hosted image should be here but it was not working when we last tested it.
New caps at regulated PSU (at right) replace the stock ones. Original C99 was ~84uF, too low.
An externally hosted image should be here but it was not working when we last tested it.
Below, C43 and C44 line out caps (now 3.3uF, MKP type), and C40 cap for opamp decoupling was 47uF/16V, now 150uF/25V.
An externally hosted image should be here but it was not working when we last tested it.
Opamp OPA2134UA replaces stock JRC4558 in IC3.
An externally hosted image should be here but it was not working when we last tested it.
Below, the composite and MPX sections were upgraded in capacitance:
C27 - new 56uF/50V + 0.056 Polypropylene bypass (stock value 22uF/16V)
C28 - new 100uF/25V + 0.056 Polypropylene bypass (stock value 22uF/16V)
C38 - new 220uF/35V (blue BC Vishay) replaced the stock 220uF/16V, which measured ~203uF.
An externally hosted image should be here but it was not working when we last tested it.
C5 for the front end varactor went from 10uF/16V to 22uF/35V.
An externally hosted image should be here but it was not working when we last tested it.
Tuner is on since yesterday, non-stop. Sound is really nice with tighter bass and better soundstage. Vocals are more accentuated. I'll leave the tuner on for another day...
Again...
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
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