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dbx120XP transformer replacement

There is a pdf of this repair, here

above: The original transformer, by BILLION.

Below are some more manuals and information relating to the dbx120XP. I found them elsewhere on the internet, credit to whoever uploaded them originally (and/or Harman/Samsung):

A scanned copy of the user manual is here;

The full schematic is here;

A datasheet for the 7815 regulator is here;

A datasheet for the 7915 regulator is here;

The dbx120XP spec/cut sheet is here.

Roland M-DC1 headphone socket repair

There is a pdf of this repair, here

A scanned copy of the user manual is here;

Another document containing a patch listing is here;

A datasheet for the C4570HA op-amp IC is here;

Part of the manual showing the bulk sysex dump procedure:

above: Bulk sysex dump procedure, from p.6 of the manual.