MXR P100 GGG No output

[storgio]

Hi guys, I'm new on this forum but not really in stomps boxes.
I need some help to fix issues with P100 from GGG.
I build it years ago and was working flawless, after a long time left unused is not working anymore. There is simply no output when turned on.
ICS are fine, transistors too, bypass button is fine, the output is not earthed.
What should I search for???
I'm desperate..

[bluebunny]

Welcome.  Check out the sticky "Debugging" thread.  Follow the instructions and report back! 

[storgio]

Hi guys,
many thanks for your help.

The project is from GGG, that is the link http://www.generalguitargadgets.com/effects-projects/phase-shifters/mxr-phase-100/

Here is the voltage reading list:

Q1: 0/0.6/3.8
Q2: 0.6/1/3.8
Q3: 0/0.6/0.9
Q4: 3.5/4.4/8.5

IC1: 1.3/1.3/0.95/0 3.95/4.37/4to4.5 moving continiusly/8.4
IC2: 1.3/1.3/0.95/0 0.95/1.3/1.3/8.4
IC3: 1.3/1.3/0.95/0 0.95/1.3/1.3/8.4
IC4: 1.3/1.17/0.95/0 0.95/1.3/1.3/8.4
IC5: 1.3/1.3/0.95/0 0.95/1.3/1.3/8.4
IC6: 1.3/1.3/0.95/0 0.95/1.3/1.3/8.4

Zener diode 8.4/0

Based on that schematics, https://www.micros.com.pl/mediaserver/info-oovtl5c22.pdf those are voltages on VTL5C2/2

OC1:3.63/5.2/0/0.98/0.98
OC2: 5.23/6.8/0.95/0.95/0.95
OC3: 6.8/8.4/1/1/0.65

I swapped the trasistors to another pedeal and is still working, I did the same with TL022 and the pedal is still working too, so I believe those parts are ok.

Thanks again

[storgio]

Readings are made with the first setting of rotary switch and full speed flanger

[Fender3D]

ICs should have ~1/2 Vcc at their signal pins, you barely got 1V...
Check R39 and C17 or follow the Vbias rail for short or bad contact

[storgio]

Thx, I will check it now.

I have to say that there is some output, I didn't noticed cause its audible only at really high volumes.

[storgio]

ICs should have ~1/2 Vcc at their signal pins, you barely got 1V...
Check R39 and C17 or follow the Vbias rail for short or bad contact

Solved! The problem was the resistor.

Thank you very much Fender3D