DX7-4X-EXP
Page 2 of 6
Install v2.11
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Preliminary
Condition of DX7
While the DX7-4X-EXP will replace the functionality of damaged or missing EPROM and/or
SRAM chips, it will not correct other problems your vintage synthesizer may have. It is
recommended that the synth be in otherwise good condition before beginning the installation. For
instance, the battery voltage should be checked and the battery replaced/repaired by a tech if
necessary. Sockets for the EPROM and SRAM chips should be in good working order and not be
dirty, oxidized, rusted or otherwise compromised. If repair is required, do it before installing DX7-
4X-EXP.
2: Installation
Back up your patches if they are important to you!
Open the DX7
Using a Philips head screwdriver,
remove the 5 screws from the front panel
. Two are located
on the left front. Two are located on the right front. A final one is located on the right rear. Set the
screws aside, noting that the rear panel one is the shortest.
(Re)Move the Keybed & Remove the Keyboard Rail
Some of the solder connections are very close to the silver colored metal keyboard rail. By
moving the keybed (the chassis with the keys) and removing the silver keyboard rail, you will
have better sight lines and freedom of movement when installing the DX7-4X-EXP board.
Remove the 4 large external screws from the underside of the keyboard
along the front
edge. The photo below shows the inside front edge of the empty case bottom and illustrates the
location of the 4 screws. You will, of course, be unscrewing from the DX7 underside.
