Yamaha DX7 8X EXP Manuale utente

DX7_8X_EXP Page 1 of 6 Install v2.22

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Yamaha DX7 8X EXPansion Installation

1: Introduction

The DX7_8X_EXP a powerful option board that provides increased memory and greater control

of the DX7.

THIS INSTALLATION WILL REQUIRE SOLDERING EXPERTISE AND ELECTRONIC

KNOWLEDGE. THE INSTALLATION SHOULD BE REFERRED TO A QUALIFIED

TECHNICIAN.

The soldering work entails direct wire connection to IC's already installed on a PCB. The

backup battery voltage is still live. This is a volatile Lithium battery. We accept no

responsibility for the work you perform on your DX7, your safety or material losses.

Precautions!

High Voltage Safety Warning

Unplug the audio cable. Turn the DX7 power switch OFF and disconnect the AC power cable

before opening the DX7.

ESD Precautions and Proper Handling Procedures

You should observe standard static-safe handling behavior when working with sensitive electronic

equipment such as synthesizers:

o Avoid carpets in cool, dry areas.

o Dissipate static electricity before handling any system components by touching a

grounded metal object.

o If possible, use anti-static devices, such as wrist straps and floor mats.

o Take care when installing the board. A damaged pin can render the board unusable.

o Prevent damage to the connectors by aligning connector pins before you apply pressure.

A damaged pin can render the board unusable and can cause damage to system

components at power-on.

o If disconnecting a cable, always pull on the cable connector, not on the cable itself.

Tools Required

o Standard Philips screwdriver.

o Standard flat-head screwdriver (small).

o Standard soldering iron and solder. Because most soldering irons are grounded-tip,

you must unplug all cables from the DX7.

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Condition of DX7

While the DX7_8X_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_8X_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_8X_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.

DX7_8X_EXP Page 3 of 6 Install v2.22

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Loosen the 3 internal screws at the extreme right and left ends that hold the keybed in

place. It is not necessary to extract them from the holes they reside in.

Carefully lift the keybed slightly up and out (toward yourself) an inch or so.. You don't need

to move it much. You will probably need to free up one or more cables to accomplish it. Or if you

prefer, disconnect the cables and completely remove the keybed.

This will give you access to the 3 screws holding the silver keyboard rail in place. Remove those

three screws and set aside the silver keyboard rail. (Shown here with keybed removed).

You now have excellent

access to the DX7 main

board. If you do remove the

keybed you may find it easier

to remove the small yellow

cable and large flat grayish

cable at the main-board-end

rather than from the keybed.

You will also need to unclip

two small cables on the left

end (mod wheel and pitch

bend). There may also be

wire tires and/or cable

fasteners to deal with.

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Remove the EPROM and SRAM ICs

The next step is to remove

the EPROM and two SRAM

ICs.

The EPROM is found in

location IC14 and the two

M5M5118P SRAM chips are

located at IC21 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.

Place them safely aside on

anti-static foam. You can use

the reverse side of the foam

shipped with the DX7-8X-

EXP.

The photo above shows the 3 chips removed.

Install the DX7_8X_EXP Wiring

FOLLOW THE INSTALLATION STEPS EXACTLY. Do NOT install the circuit board at this time!

Carefully unplug the 3-conductor cable from

the DX7_8X_EXP board and set the board

aside. The 3 wires that make up this cable

need to be soldered onto chips that are

already present on the DX7 main board. (Do

not mistake the wire colors for power and

ground. They are not.)

The cable is about twice the length you need

for the standard installation. Some alternate

solder points are provided if you want to be

creative. You don't have to shorten the wires

but it is recommended that you cut the length

down by half then strip and tin the leads.

PCB shown reverse angle.

CE20* : The RED wire should be soldered onto IC22 pin 3.

A15 : The WHITE wire should be soldered onto IC23 pin 4.

[Alternate A15 points: IC63 pin 4 -or- IC34 pin 5.]

A14 : The BLACK wire should be soldered onto IC23 pin 5.

[Alternate A14 points: IC63 pin 3 -or- IC34 pin4.]

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Install the DX7_8X_EXP Printed Circuit Board

Remove the DX7_8X_EXP board from the anti-static foam. Inspect the bottom of the board to

make sure none of the pins have been damaged. You should see one collection of 28 pins (2

parallel strips of 14 pins), and a strip of 7 pins.

Do NOT connect the cable to the board yet.

Place the DX7_8X_EXP board gently on the DX7 main board so that the 28 pins that form a DIP

package align with the vacated IC14 spot. The 7 pins along the edge should align with IC21. Do

not press the board in place yet. You can use a small mirror to check the pin alignment.

Once you are happy that all the pins are aligning with the desired locations, firmly and evenly

press the DX7_8X_EXP board in place. Make a visual check to see that the board is flush with

the sockets.

Carefully plug the 3-conductor cable back on the expander (it only goes in one way). Hold the

board in place while doing so by pressing down on the EPROM area (the chip with the white

label).

From keyboard playing side Reverse angle with keybed and rail back in.

DX7_8X_EXP Page 6 of 6 Install v2.22

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Reassembly

Remove all tools from the DX7. Carefully reassemble the DX7 in the reverse order, taking care to

replace the correct screws in the various locations. If you disconnected the green keybed ground

strap wire don't forget to screw it back in. Do not snag, tug or otherwise interfere with the wires

you have soldered on.

Test

Plug the AC cable in and turn it on. You should get a greeting message like:

* Welcome to *

* DX7 8x Exp *

Troubleshooting: If you don't see this after a couple of seconds, you have probably soldered the

wires onto the wrong spots or the solder connections are poor. All of the expansions have been

tested in a real DX7 prior to shipping. Recommend removing whole expansion and start over.

You can do a quick version check of the board by pressing and holding the front Function button

and also pressing and holding buttons 16 and 32. You should see something like the following:

DX7 8x Exp v2.22

Test Entry ?

Press INTERNAL twice to return to the main screen (or press NO or power the DX7 off).

Since technically the battery has been removed, you may find some of the standard DX7

Function settings have been scrambled (Eg. Portamento Time usually). Check/set the

standard DX7 Function settings versus your preferences.

You will need to set the initial DX7_8X_EXP parameters on FUNCTION 13 (or 12) and then load

up to 8 banks of 32 patches (what Yamaha calls Voices). Each bank must be activated by a patch

selection (which will initially be garbled data) then the data can be loaded via cartridge or MIDI.

Consult the online "Yamaha DX7 8x Expansion User Guide" for more information on using

your upgraded DX7.

For your convenience, the recommended default settings for FUNCTION 13 (or 12) are shown

here:

 Midi Trns Ch= 1

 Vel OFFSET= 0

 2nd CH VOICE=1

 LOCAL ON

 SPLIT OFF

 ACTIVE SENSE=OFF

Enjoy your updated DX7!

See the MTG web site for more great vintage synth and drum machine goodies.

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