Kustom Quad 100HD schematic

[Nyqusit5]

Hi,
I am repairing a Kustom Quad 100HD which digital effects are cutting out when the volume is past 10 o'clock (whatever channel) for a local rehearsal studio. I have a feeling that its the driving JRC2120D that's at fault but I can't spend too much time on it looking for the fault as its a very cheap unit. Anybody has the schematic of this amp?
Thanks in advance!

[Jazz P Bass]

Kustom Quad 100 DFX Service Manual

Here you be.
Care of ElektroTanya.

[Nyqusit5]

Thank you very very much.
I had a look on ElektroTanya but didn't see it. Will have a better look next time.

[Tone Meister]

Can someone repost the schematic for the Quad 100FX?

[Jazz P Bass]

Kustom Quad 100HD Schemtic

Here it is: