Dunlop - TS-1 Tremolo - intensity problem

denis moulin · Post by **denis moulin** » 28 Aug 2019, 10:18

Hi everybody,

I have a Dunlop TS-1 tremolo pan, stil with plastic knobs.

It's working fine except the intensity is stuck to the max.

it is NOT the pot.

Someone knows the issue ?

Anyone has schematic for this ?

Thank you so much

denis

Post by **modman** » 28 Aug 2019, 16:59

this unit is probably identical to the MXR M-159 Tremolo which was request about 5 years ago. You will have to open the unit up to fix whatever small problem this is. Would be great if you can take some pictures of both sides of the pcb.

denis moulin · Post by **denis moulin** » 28 Aug 2019, 19:12

Yes it should not be very different. The MXR is 18V I think and this is 9V, but it should be the same circuitry.

I'll post some pics

top of the PCB, intensity knob is on the left, above left soket

https://www.flickr.com/photos/125341952 ... ed-public/

denis moulin · Post by **denis moulin** » 28 Aug 2019, 19:22

rear of the PCB

https://www.flickr.com/photos/125341952 ... ed-public/

closer

https://www.flickr.com/photos/125341952 ... ed-public/

Il y a un VCA : AM5207L01

https://www.flickr.com/photos/125341952 ... ed-public/

Bernardduur · Post by **Bernardduur** » 27 Apr 2022, 12:03

I had the same problem. TP1 sets the minimum intensity depth

Stevenrb718 · Post by **Stevenrb718** » 01 Sep 2022, 14:33

Did this issue get solved? I have the same problem, but TP1 doesn't seem to change anything. The voltage going into the LED does change with intensity knob and TP1 adjustments, but the effect remains the same.

GorillaHuman · Post by **GorillaHuman** » 21 Feb 2024, 20:46

Bumping this thread. Got similar problem! Setting TP1 does not change the behavior of the depth knob. After measuring I got fed up, and I baldly replaced Q2, U4, U5, U6 and even U8. Shotgun approach.... But the issue remains the same! This circuit has got me baffled; not understanding why the intensity won't be more subtle.. Anyone any ideas?

Stevenrb718 · Post by **Stevenrb718** » 21 Feb 2024, 20:56

GorillaHuman wrote: ↑21 Feb 2024, 20:46 Bumping this thread. Got similar problem! Setting TP1 does not change the behavior of the depth knob. After measuring I got fed up, and I baldly replaced Q2, U4, U5, U6 and even U8. Shotgun approach.... But the issue remains the same! This circuit has got me baffled; not understanding why the intensity won't be more subtle.. Anyone any ideas?

I ended up getting mine to work, but I'm going to have to rack my brain to remember what I did to fix it.

GorillaHuman · Post by **GorillaHuman** » 23 Feb 2024, 13:12

Thanks Steven,great to hear it cán be fixed, let me know when that gray matter came up with the solution!

GorillaHuman · Post by **GorillaHuman** » 22 Mar 2024, 19:12

Any ideas please?

Stevenrb718 · Post by **Stevenrb718** » 29 Mar 2024, 16:32

GorillaHuman wrote: ↑22 Mar 2024, 19:12 Any ideas please?

I wish I could remember, but I really have no memory of what I did to fix it. I do n remember being somewhat perturbed because it was an easy fix.