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If I remove Q1 I also get 4V on R2 top side and 17.3V on the bottom side of the resistor. What’s interesting is if I remove all three transistors I get 18.13V on north side of R2 and 18.32V on south (vcc) side.. also to rule out the actual transistors even further, I had some BC109s arrive in...

btw I have tried two different sources of 2N5088s with same results

The underside solder joints are reading the same as the transistor legs (Q1 2.2,1.6,1.03) so they must be connecting okay? So I figured out how I was reading 4V randomly. When I pull out the Q1 transistor and read the Q1 socket or solder joints I get 4V, 3.5V, 013V. I guess when I was pushing...

They are definitely all 5088s. I have a bunch and have even been switching them in now that I have the transistor sockets in there and getting pretty much the same readings. I think the sockets may possibly be causing the Q1 issues. The Q1 collector is reading 2.2V fairly consistently but if I...

I checked resistance from D102 to Q1 collector and it’s exactly 100.2K ohms. I cleaned around the R2 resistor solders and don’t see anything that could be possibly touching it 🤔

I answered my own question by measuring voltage on the actual Q1 legs and they match the socket legs and the linked resistors. I’m getting Q1 left to right: 2.2V, 1.5V, 1V

I pulled out R2 to be safe and swapped in another 100K. Afterwards I’m getting 1.5V but then I moved the pcb while reading and it jumped up to around 4V Q1 base and collector but is now down around 1.5 to 2 again. Would a loose Q1 transistor inside the socket be causing the inconsistency or...

I reflowed R2 and it’s still pretty much the same voltage. Q1 collector is 2.29, the top of R2 is 2.29 and the bottom is 17.75 (vcc). Base of Q2 is same collector of Q1 (2.29). Curious why the collector of Q2 10.98 but the base of Q3 is only 2.69? Shouldn’t they be the same? Is it because the...

The voltages I’m getting now are: Q1 (left to right) 2.35, 1.61, 1.05 Q2 10.98, 2.34, 1.71 Q3 9.63, 2.69, 2.06 I checked with the audio probe and the collector of Q3 is the same volume as the input jack. When I probe the “out” pad of the pcb the volume has dropped unless I crank the volume...

Okay, so I took a day off and came back to this thing today. I jumped the collectors of Q1 and Q2 as they had no continuity with the resistors. Now they have continuity and higher voltages. I tested on the out pad of the pcb and we have signal! This is promising. I installed a new footswitch as...

Q1 right side (emitter) looks like the pad is missing. I also checked continuity between that and R6 (which looks like joined on the pcb diagram) and nothing. So maybe that where the problem lies? A jumper? https://leeselectronic.com/en/product/7133.html R2 north side I get .070V bottom side I...

Hmm so I flipped the 5088s and same voltages on all the legs as when they were the other way around. The collector (left leg) of Q1 is .70V and the R2+ 10k is also .70V. Q2 collector is .08V and the R3+ 1.8K is also .08V. Q3 is 9.70V and R13+ 1.8K is also 9.70V. That’s telling me that...

I was able to google these values for a genuine Colorsound Overdriver: Genuine Pedal voltages Battery: 18.84V Q1 C 6.43V B 3.92V E 3.54V Q2 C 11.53V B 6.44V E 5.82V Q3 C 10.19V B 2.77V E 2.23V Looks my Q1 voltages are way too low.

I’m having trouble understanding how the transistors work. There is audio signal coming into the base of Q1 (I checked with an audio probe) that measures .08V. (And it goes to R5 as well). But there’s no audio or continuity to either outside lug of Q1? Do transistors need a certain voltage...

Just to confirm the jumper goes like this?

I just checked with a probe and volume pot lug 2 is not getting any guitar signal I was able to probe the guitar signal at the base of Q1 but no signal on the either outside lugs of Q1. It's coming into Q1 but not going out? I'm new-ish to electronics but shouldn't the signal come into the...

Well you were right about replacing the transistors too many times. I think I ruined this pcb. It looks like at least one of the transistor pads has gone missing (Q2 Emitter). Was it from using the solder sucker too many times? Or from too much heat? Can this pcb be saved? I've already wasted 6...

I just checked the footswitch with my meter and theres NO continuity between lugs 8 and 9! I reflowed some solder on them and still no connection. Faulty switch I guess?

Thanks so much for you suggestions! As for the footswitch, the jacks are 100% soldered correctly, and the lugs on the footswitch are 100% soldered to the pcb really well (and resolded several times). I'm going to chock it up to a bad footswitch... Anyways, since I posted I removed the footswitch...

https://www.taydaelectronics.com/3pdt-stomp-foot-pedal-switch.html This footswitch specifically