Boss DD-3 repair.

Here’s another Boss DD-3. The pedal gives signal in bypass, with effect engaged there’s just dry sound.

Boss_DD-3 Repair
Boss DD-3 repair.

Someone has done some repair to the circuitboards power section seen in the upper left on this image.

Boss_DD-3 Repair
Boss DD-3 repair.

The Mode selector rotary switch out of the chassie for replacement.

Boss DD-3 repair
Boss DD-3 repair.

Old vs new rotary switch.

Boss DD-3 repair
Boss DD-3 rotary switch.

So what’s wrong with it. Found that C34 was broken, it did not pass any signal to the expander circuit. Had it replaced and got the delayed signal through the circuit, though at to high level and distorted. C31 was the cause of that problem. With C31 replaced the pedal works as it should. The tantalum capacitors C32 and C33 was also swapped with new ones as they do tend to fail in time. Checked and adjusted the high and low end of the Master clock frequency.

Boss DD-3 repair
Boss DD-3 repair.

Here’s the service notes: Boss DD2-DD3.

/Krister

Boss AW-2 service

A Boss AW-2 on the bench for some service.

Boss Auto Wah service
Boss AW-2

Circuit board.

Boss Auto Wah service
Boss AW-2 circuit board solder side

Component side of the circuit board.

Boss Auto Wah service
Boss AW-2 circuit board

The pedal a bit cleaned up and recaped.

Boss AW-2

/Krister

Boss DD-3 repaired

Checked the switch for D.TIME due to the problem of changing from 200mS to 800mS of delay. Found it’s not the cause. Had the wiring from the switch resoldered and it’s hey, it’s back in normal operation! Also fixed the knob for E.LEVEL wich was glued in place.

Boss DD-3 repair
A Boss DD-3 repaired

/Krister

Boss DD-3 repair

Got a Boss DD-3 on the workbench.

Boss DD-3 repair
The Boss DD-3 pedal

Got some problem with the pots I was told. Nice and clean on the solder side of the circuit board.

Boss DD-3 repair
Solder side of the circuit board

Here’s a picture of the component side.

Boss DD-3 repair. circuit board
Boss DD-3 circuit board

When played it seems the select knob has trouble changing from 200mS to the 800mS setting.

/Krister

Boss DS-1 OD mod

Turning the Boss DS-1 into something more of an overdrive, giving it a more dynamic response. Changes are made to the transistor booster stage, OP-amp gain stage and the overall frequency respons. Check Thomas Ziden as he gives an somewhat unusual pedal demo.

/Krister

Boss bypass mod

Got a dead Boss DS-1 on the bench for repair and modification. I just had to replace the fried opamp and it was up and running. I was also told to mod the pedal in anyway I liked. Ever since I made the T-rex Mudhoney 2:nd stage mod the idea has been there to try something similar on a Boss or Ibanez pedal. So here it is on a Boss DS-1 pedal, the feature to choose a latching or momentary bypass.

Boss DS-1 latching or momentary bypass.

/Krister Östman