DX7 S
Page 5 of 7
Install
www.musictechnologiesgroup.com
The EPROM is found in location IC14 and the two M5M5118P SRAM chips are located at IC21
1
and IC20.
Remove them by prying slowly at each end of the chip back-and-forth with a small flat-head
screwdriver. Avoid touching any of the metal pins with the screwdriver. Also be careful of the
capacitors nearby (these are the flat green discs in the photos).
Place the cheips safely aside on anti-static foam. You can use the reverse side of the foam
shipped with the S.
After removing the chips, also
remove the screw shown at the center of this photos near
IC23
.
Install the S Board
Hand-tighten the supplied nylon standoff into the
screw position near IC23. Tighten it well by hand,
but there is generally no need to use a tool. Do not
over tighten or strip the threads.
Next, CAREFULLY remove the S board
from its anti-static packaging. Inspect the bottom of
the board to make sure none of the pins have been
damaged or have any debris on them.
Identify your S board version.
Rev A:
You should see one collection of 28 pins (2
parallel strips of 14 pins), one collection of 24 pins
(2 parallel strips of 12 pins) and a strip of 8 pins.
The photos on the next page show the Rev A boards
Rev B:
You should see one collection of 28 pins (2 parallel strips of 14 pins), and two strips of 8
pins.
1
Some models of DX7 utilize a second EPROM at position IC15. You will need to perform a factory
modification before proceeding. These are very rare.
