Deep Vibes vibrato troubleshooting

[lvckv]

Fuzzdog Deep Vibes (Earthquaker The Depths clone)

Pedal pretty much sounds like a clean boost at all settings (which is useful because I haven't one of them but still...)
Volume knob works fine. Intensity, Voice, Throb and Rate change the flash of internal LED  but don't have effect on sound.
The sound totally cuts out when Voice is turned all the way up.

PDF here - http://pedalparts.co.uk/docs/DeepVibes.pdf

No modifications or parts substitutions.

Power readings are fine at input and both boards. ICs and caps are installed correctly/in the correct pads.

Here are the readings of the two ICs. They always seem to go wrong on the things I build... Have a feeling these readings aren't how they're supposed to look now either 

IC1 - TL072
2.92
2.95
1.42
0.00

2.58
2.89
2.83
8.9

IC2 - TL074
2.84
3.02
2.98
8.90
2.86
2.92
3.08

8.19
5.42
0.00
0.00
2.86
3.97
1.38

[Kevin Mitchell]

I can't get into the build docs at the moment. But I will point out that some of your resistor values don't match that of other builds on the internet.

Like R5 for example. From what I can find it should be 22k, not 4.7k.
I'd check them all.

[lvckv]

Ah that's a good spot. Didn't notice. Just checked and the rest are all correct. They didn't send a 22k in the kit, I guess.

Will swap one in and report back. Hopefully that's it..

[lvckv]

Have replaced that 4.7k with a 22k and everything is the same – in terms of output sounds, volume control, internal LED changing with controls.

[lvckv]

Anybody with any idea about those IC readings?

[ElectricDruid]

The third amp on IC 3 looks funny. Pins 8,9,10. 8.19V, 5.42V, 0.00V isn't a good look for an op-amp.

Given that that amp is the first amp in the phaser chain, that'd explain why things aren't working...

The pin that's most wrong is pin 10, which should be at 4.5V (or close) not ground. It's hard down to ground and the amp is acting as an inverting amp, so the output is hard up to +9V. So the output makes sense given the inputs, but the input is wrong.

Check that LDR, check the soldering for shorts, check if the LED is permanently on. Anything that could cause that pin to be dragged low.

HTH

[duck_arse]

I'd pull the opamps from the sockets, and measure the voltages on the empty sockets. measure VA voltage. there is a pair of resistors, R11 and R14 which you need to measure for resistance. they look different to others supposedly the same value, and one of them is in the VA divider.

[ElectricDruid]

+1 what Duck said. This is a good idea. Check that everything is where it should be without the chips first, and then we know if we're putting the chips into a nice cosy solid situation!