Boss DR-55: getting inside

The DR-55 is easy to get into, but I’ve found that removing the screws on the front panel makes it harder. I recommend the following procedure:

  1. Unclip the battery holder if present
  2. Remove the knobs (they should just pull off)
  3. Unscrew the nuts securing the 1/4” jacks
  4. Remove the screws on the rear and front edges
  5. Prise apart the shell, taking care with the jack wiring
  6. Remove the screws on the rear of the PCB that secure it to the standoffs

The washers are easily misplaced. Those standoffs are better left attached to the body. Note the arrangement of the jack wiring when you gain access, as it’s easy to trap wires on reassembly. The Boss DR-55 Service Manual also recommends avoiding certain wire placement due to possible interference.

Here’s the DR-55 in the nude, complete with a broken wire or two:

Boss DR-55 internals top

Boss DR-55 internals top

Boss DR-55 internals underside

Boss DR-55 internals underside




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2 responses to “Boss DR-55: getting inside”

  1. James Bensley says :

    Hey, thanks for the info and video. I just bought one of these things and you describe that it requires 4 AA batteries. I just opened the battery holder and it appears it can only carry 2 AA batteries! really would appreciate your assistance man!

    • synthnerd says :

      I wonder if someone has put the wrong battery holder in there? It should be a long, thin holder that takes up the whole of the available space, two AA wide and two AA long, with a PP3 (9v) style clip on it. Don’t use a 9V with it though, you’ll likely kill the RAM, it’s only specced for a maximum of 6 or 7V.

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