Recent content by marcusbig

Found the problem. Awesome tone :LOL: [Replaced parts] 1. C4 - Electrolytic capacitor 47uF. (Faulty) 2. Q100, Q101 - 2N4401 NPN TR (Looks OK but just in case) 3. Q102 - 2N4403 PNP TR (Looks OK but just in case) [Jump Wire] There is a connection issue between the gain switch and the PCB...

Thanks a lot for your advice.

Thank you for your advice. Did you intend to swap R3 and R4 or just replace them with new resistors of the same value? Do you have any suggestions for circuit checkpoints or parts such as diodes or capacitors? Thanks.

YES. R3 - 22K <------> IC2 pin 5 (GREEN) R3 - 22K <------> IC2 pin 3 (BLUE) R4 - 1K <------> IC2 pin 6 (RED) R4 - 1K <------> IC2 pin 1 &2 (PURPLE) Note) R3, R4 & R5 resistor values are all correct. (Checked) Just wondering, do I need to replace any parts?

Here are the 'Remove IC2 & swap IC1 or IC3' results of the test. Please see the picture below. Thanks.

Should have Continuity??? --> YES. Checked with a multimeter.

Thanks a lot for your guidance. Here are the results of the test. - (Note) 3 times average value. Please see picture below. [Observation] 1. IC2 pin1, 2 & 3 voltage is keep changing between 200 ~ 300mW.(Almost No voltage detection) 2. IC2 pin 6 voltage 4.61 Volt 2. IC100 - 7660SCPAZ...

First of all, appreciate all your comments. (y) 1. Jumper between R13 and IC4 pin7 2. C11 is very melted - Yes. accidentally touched by Soldering Irons (But before melted sound was not coming out from the pedal) 3. Visual inspection of component orientation --> Couple of times already since...

Yes. only connected to each other. Not going to Ground.

Just wondering which pins are the correct pins for Voltages testing. (I'm sorry for my limited knowledge) Please let me know. Thanks.

[Connectivity check results] 1. R13 & IC4 Pin 7 - Yes 2. Ground point - Yes (All good)

My apologies, the R13 pad is connected to IC4 pin 7. Thank you for your comment.

Hi All I've been working on the Chauffeur Overdrive as my first pedal build. https://www.pedalpcb.com/product/pcb387/ First of all, the inspection of all the parts and the PCB. Fortunately, I found that one of the PCB patterns is disconnected in the middle of the line between R13 - IC4 6pin...