MXR "Digital Time Delay" need advice

[GibsonGM]

Hi guys,

My buddy broke his vintage MXR Digital Time Delay (Think it is the M-175).   It sounds like a gated ring mod now    I'm about the only guy within a couple hundred miles who might be able to help.   

I have looked high and low for the schematic, and CANNOT find one...anyone have this, or a good resource that may have one?  I really don't think it can be fixed without one; pots, jacks, power supply, switches all fine, so something is blown. 

Thanks!