There is no schematic for this because I did this one years and years ago and I can't find the schematic that had the right component numbers to it and usually it causes confusion when components don't match their numbers on the schematics.
This particular layout was made from tracing an original unit and some of the component values differ from schematics that are on the net and I assume that they either cloned theirs without removing the components and measuring them and just went by what the component was marked as - this is where people go wrong because some manufacturers mark their components wrong to hinder cloners.
anyway here is the layout
