The XB-2 Main Board

Fixing Hammond XB-2

A few weeks ago Dejan and I began our work on Hammond XB-2 again. The current problem can be heard here:

We tracked the problem back to the static RAMs, which was also mentioned as a solution in one of the comments on this similar youtube video.

We opened the keyboard and took out the main board. As you can see in the picture below, somebody already played (changed) the MUSE RAM chips (the size is different, thus the chips are hanging by the wires – top right corner).

The XB-2 main board

The XB-2 main board

Suprisingly, this thing worked in its own distorted way …

When you change the chips, make sure that you have the same form factor

When you change the chips, make sure that you have the same form factor

We unsoldered the old chips and cleaned the board …

Cleaning the holes ...

Cleaning the holes …

We also made sure we have the right DIL (dual in-line) sockets and put those on first.

Lots of pins to solder ...

Lots of pins to solder …

The DILs

The DILs

Dejan obtained the replacement chips from old computer boards. These are not identical to the originals (the new ones must be newer since the old ones had 70ms latency according to the manual) but should do the job.

Chips in sockets

Chips in sockets

However, the problem remained. Next step: change the V61C16 chips. Unfortunately we don’t have those and need to find them (or their alternatives) first. If anyone has any information on where to get them, please let me know!

1 Comment

  • Hammond XB-2 – the conclusion – Matevž Pesek Blog March 2, 2017 at 9:38 pm

    […] I have finally managed to perform one last attempt to fix the Hammond XB-2. As said in my previous blog post, the XB-2 I bought had an interesting distorted sound problem. This is a video of the sound […]


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