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Analog Vibrato IC Chips all measuring ~9 volts

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christopherevers

Post subject: Analog Vibrato IC Chips all measuring ~9 volts

Posted: Tue May 11, 2021 10:10 am

Joined: Tue May 11, 2021 9:24 am
Posts: 3

My pedal is passing signal but none of the effects work. I measured the ic chips and each pin is measuring ~9 volts. All solder connections on the front and back look clean so I’m not sure what I’m missing. I’m hoping someone can help identify the problem for me!

Last edited by christopherevers on Tue May 11, 2021 10:21 am, edited 1 time in total.

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christopherevers

Post subject: Re: Analog Reverb IC Chips all measuring ~9 volts

Posted: Tue May 11, 2021 10:11 am

Joined: Tue May 11, 2021 9:24 am
Posts: 3

Also the 25k (bias) trimpot was being a little finicky and distorting when adjusting the screw. I'm not sure if that is what is causing the issue or not.

Last edited by christopherevers on Tue May 11, 2021 10:23 am, edited 1 time in total.

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christopherevers

Post subject: Re: Analog Reverb IC Chips all measuring ~9 volts

Posted: Tue May 11, 2021 10:16 am

Joined: Tue May 11, 2021 9:24 am
Posts: 3

Here is a picture of my pedal:

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F7531830-1F2D-45A1-9557-689A99CEC1A8.jpeg [ 428.66 KiB | Viewed 1305 times ]

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Morgan

Post subject: Re: Analog Vibrato IC Chips all measuring ~9 volts

Posted: Tue May 11, 2021 1:36 pm

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Joined: Wed Apr 26, 2006 5:14 pm
Posts: 8659
Location: Truckee, CA

Hi - welcome to the forum!

I think that you might be making a mistake when taking your voltage readings. If you actually had 9 volts on every pin of the 4558 chip, the pedal would not pass sound in effect mode.

Here's a good tutorial:

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

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