Boss Super Shifter Help

[jbubendorf]

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.

 

[Enzo]

Google "boss ps-5 schematic" and the schematic should be staring back at you about the thrid or fourth thing down.

 

[jbubendorf]

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!

 

[Tesla88]

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...

 

[Enzo]

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.

 

[jbubendorf]

I don't expect it is anything as significant as the DSP. A picture is worth a thousand words though, so have a look...

 

[MereTenacity]

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.

 

[Tesla88]

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?

 

[Tesla88]

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 ..