Colorsound Frankenflanger repair

About the Colorsound Flanger in an earlier post here. Found some schematics that helped rebuild the circuit.

Colorsound Flanger

Gut shot of the pedal in a working state.

Colorsound flanger repair
Colorsound Flanger

So pleased to here it producing flanging sound again. Here’s a short soundclip.

Repaired Colorsound Flanger

/Krister

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

Nadine’s Distortion

A rare piece of non functional equipment, a Nadine’s Distortion on the workbench.

Nadines Distortion
Nadine’s Distortion

Gut shot, the circuit board in nice condition.

Nadines Distortion
Nadine’s Distortion guts

Component side.

Nadines Distortion
Nadine’s Distortion

The 6552 opamp was burnt, once replaced the pedal’s rocking again. Image of the circuit board with a socketed RC4558 as replacement for the 6552, the old electrolytic capacitors changed and a new battery clip installed.

Nadines Distortion
Nadine’s Distortion

/Krister

Yamaha CH-01 Chorus repair

A chorus from the -80:s, the Yamaha CH-01. Based on the MN3009 256 stage BBD chip and the MN3101 clock generator.

Yamaha CH-01 repair
Yamaha CH-01 Chorus

Had the circuit recaped and trimmers adjusted for bias, clock speed and depth.

Yamaha CH-01 repair
Yamaha CH-01 Chorus circuit board

And here we have a chorus once again delivering.

Yamaha CH-01 repair
Yamaha CH-01 Chorus

/Krister

Spare parts

Received a shipment with parts for a Marshall 2205. Thumbs up for Tube-Town, they sent chocalate with the package!

Parts Marshall 2205
Marshall 2205 parts with chocolate

/Krister

Malfunctional Zachry D250 mono block

Here’s a Zachry D250 solid state amplifier. It stopped working producing only a 100Hz noise. Look at them blue filter caps, seems a bit swollen.

Zachry D250 repair
Zachry D250

Here’s a picture from the bottom of the caps.

Zachry D250 repair
Zachry D250

Those caps are out of date. Had a hard time finding 15000uF 63V caps with a diameter of 35mm. Finaly found and ordered F&T :s with the right values but a diameter of 40mm. I should be able to fit hem.

/Krister

Laney Klipp 100

An old Laney amp that needs som tendering.

Laney Klipp100

Blows the main fuse. Tinkered with as it has a master volume pot installed and traces of other activites.

Laney Klipp100
Laney Klipp100

Components close up.

Laney Klipp100
Laney Klipp100
Laney Klipp100
Laney Klipp100

Checked the power transformer and it seems to be functional. I’ll start with recapping them old electrolytes.

/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