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Old 8th March 2013, 02:19 AM   #1
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Default Boss Super Shifter Help

I recently picked up a Boss PS-5 Super Shifter that won't power up, from Ebay.
After opening it, I found that someone else had previously attempted a repair.
Part of their "repair" was to remove IC8. Does anyone have a schematic or other information? Thanks in advance for the help.
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Old 8th March 2013, 05:49 AM   #2
Enzo is offline Enzo  United States
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Google "boss ps-5 schematic" and the schematic should be staring back at you about the thrid or fourth thing down.
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Old 8th March 2013, 12:57 PM   #3
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Thanks for the reply Enzo, and for so many of your replies to other people's questions that have answered questions for me before I have had to ask.
Unfortunately, when I run this search, Google images will show many schematics, but as I click through them, none of them are actually for the PS-5. After hours searching, the only documentation I have found is the user's manual and demo videos. I'm hoping someone here has the schematic, a picture of the board, or maybe even that someone would be willing to crack open their pedal and read me a part number.
Thanks again!
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Old 8th March 2013, 02:20 PM   #4
Tesla88 is offline Tesla88  Italy
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The PS5 is an intelligent harmonizer so it should use a sort of DSP to detect pitch an generate the harmonized note. It's not a simple device and find a schematic would be very hard...
Number of pins of IC8 and package? DIL , SIL , SOIC ecc
Hope it isn't the DSP processor or you can trash the unit...
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Old 8th March 2013, 07:41 PM   #5
Enzo is offline Enzo  United States
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You are right, I saw the image and didn't look close enough to see they were all for PS-3. Sorry.

Roland might provide a schematic, but they'd want some money for it if they do.
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Old 9th March 2013, 03:25 AM   #6
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I don't expect it is anything as significant as the DSP. A picture is worth a thousand words though, so have a look...
Attached Images
File Type: jpg 2013-03-08_21-59-21_798.jpg (554.4 KB, 29 views)
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Old 12th March 2013, 06:31 AM   #7
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Check out StompBoxZone • View topic - Boss RV-5 - It's Not Happy! Looks like the same thing on a different unit. other than electro caps it's identical to your pic. A response lists a replacement, but it's a guess. you could give it a shot.
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Old 12th March 2013, 07:42 AM   #8
Tesla88 is offline Tesla88  Italy
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Uhm IC8 seems buruned I think it's a voltage regulator due to the fact it has only 3 PIN and is an Ic (not a transistor or mosfet) , so can be a sort of voltage regulator to provide supply to DSP 3.3 or 5 don't know...Can you read anything on it?

Last edited by Tesla88; 12th March 2013 at 07:44 AM.
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Old 12th March 2013, 07:48 AM   #9
Tesla88 is offline Tesla88  Italy
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Sorry , i've just looked at stomoboxzone and seems a user report it as a
S-8520E33MC-BJS-T2
A PWM regulator to provide 3.3V .. it's hard to find
If you can find the part then fix is easy , only other solution is to use a lineare voltage regulator bypassing this part of the circuit , easy if you are experienced ..
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