Roland CUBE-40 Chorus Amp issue

[smilan]

Hi,
I have a Roland CUBE-40 Chorus Amp with an annoying problem, when I turn the chorus switch on, there's a strong electric pulse (maybe a bad cap?).
See the attached clip:
https://youtu.be/sAXPQ5jPs3I
I would like to fix this problem but I can't find the schematic for this amp (or the CUBE-60 Chorus).

Does anyone have this schematic / any idea how to fix it?

[Jazz P Bass]

One of the Jazz Chorus circuits may be similar if not the same.

Here is the JC50: Roland JC-50 Jazz Chorus (Ed.2) Service Manual.zip

[cin]

smilan , did you ever figure it out? I'm having the same issue. Any tips in fixing it would be great.