ENSONIQ Mirage - Section G: Replacing The Keyboard; Section H: Replacing Individual Keys & Cleaning The Velocity Switches

9 pages

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

SECTION

IMPORTANT!

Replacing

The

Keyboard

The

Mirage

keyboard

is

mounted

in

the

case

using

nine

mounting

screws

through

the

case

into

two

special

mounting

rails

on

the

underside

of

the

keyboard.

Since

there

are

no

pre-drilled

mounting

screw

locations

in

these

rails,

it

is

important

for

you

to

make

sure

that

the

keyboard

is

aligned

properly

before

final

installation.

Failure

to

do

so

may

result

in

faulty

keyboard

performance.

1.

Remove

all

cables

connected

to

the

Mirage,

including

the

power

cable.

2.

Remove

the

five

screws

which

fasten

the

Mirage

control

panel

and

raise

the

panel.

3.

Tilt

the

Mirage

up

on

its

back

to

expose

the

nine

keyboard

mounting

screws

on

the

bottom

of

the

unit.

Supporting

the

keyboard

with

one

hand,

carefully

remove

the

mounting

screws.

4.

Slowly

lift

the

keyboard,

from

the

disk

drive

end,

until

the

keyboard

connector

on

the

underside

of

the

keyboard

can

be

seen.

Carefully

remove

the

connector,

noting

that

the

two

blank

terminals

of

the

connector

face

the

center

of

the

keyboard.

5.

To

install

the

new

keyboard,

lay

the

right

side

of

the

keyboard

into

the

case

and

carefully

plug

the

connector

into

the

keyboard.

Note

that

the

keyboard

cable

is

pre-formed

into

several

bends.

Refer

to

Figure

5

to

make

sure

the

cable

is

properly

routed.

Then,

ж

NOTE:

PINS

25

&

26

ARE МОТ

USED

TO

J3

CONNECTOR

ON

MAIN

lower

the

left

side

of

the

keyboard

into

the

case,

making

sure

that

the

flat

cable

is

not

in

danger

of

being

pinched

by

the

keyboard

mounting

rails.

6.

Since

the

Mirage

keyboard

uses

mounting

rails,

it is

important

to

align

the

keyboard

properly

before

installing

any

of

the

mounting

screws.

The

keyboard

should

be

positioned

so

that

there

is

equal

clearance

between

the

end

key

and

case

on

both

ends

of

the

keyboard.

It

may

be

helpful

to

use

thin

cardboard

shims

to

help

maintain

this

clearance

during

installation.

7.

Once

the

keyboard

is

aligned,

tilt

the

Mirage

up

on

its

back,

while

supporting

the

keyboard

with

one

hand.

Insert

the

first

mounting

screw

in

the

center-front

mounting

hole,

and

visually

locate

the

screw

into

the

mounting

rail

channel.

Fasten

the

screw

but

do

not

secure

it.

8.

Recheck

the

alignment,

and

install

the

remaining

mounting

screws,

occasionally

rechecking

the

keyboard

alignment.

Remove

any

shims.

To

avoid

placing

any

warping

stresses

on

the

keyboard

or

case,

tighten

the

screws

from

the

center

of

the

keyboard

outwards.

9.

Test

the

operation

of

the

keys,

particularly

the

end

keys.

Close

the

panel

and

test

the

unit.

IMPORTANT!

dra

NOTE:

PINS

25

&

26

ARE

NOT

USED

IMPORTANT!

FIGURE

5

-

KEYBOARD

CABLE

SECTION

Replacing

Individual

Keys

&

Cleaning

The

Velocity

Switches

Problems

with

velocity

sensitivity

are

usually

caused

by

dirt

in

the

velocity

sensitivity

switching

circuit.

The

circuit

and

switchpads

are

located

underneath

the

keys

and

you

will

have

to

remove

the

keys

individually

to

perform

the

service.

The

flexible

switchpads

are

installed

in

five

sections.

The

first

four

sections

contain

24

pads

(12

keys),

while

the

section

on

the

far

right

end

of

the

keyboard

contains

26

pads

(13

keys).

In

order

to

properly

clean

the

switchpads,

an

entire

section

must

be

removed.

White

keys

must

be

removed

before

black

keys

can

be

removed.

1.

Remove

all

cables

connected

to

the

Mirage,

induding

the

power

cable.

2.

Remove

the

five

screws

which

fasten

the

Mirage

control

panel

and

raise

the

panel.

3.

To

remove

an

individual

key,

pull

forward

on

the

key

spring

and

lift

the

back

of

the

key

straight

up.

Then

pull

the

key

forward

and

out.

You

will

now

see

two

of

the

gray

rubber

switchpads

under

the

key.

4.

Repeat

this

procedure

until

an

entire

switchpad

segment

is

exposed.

Remove

the

segment

by

popping

it

off

the

circuit

board.

5.

Clean

the

switchpad

segment

and

circuit

board

thoroughly

with

an

electrical

contact

cleaner

(isopropyl

alcohol

is

safe).

6.

Pop

the

switchpad

into

the

circuit

board.

Install

the

keys

by

sliding

each

key

into

place,

making

sure

it

fits

onto

the

locating

peg.

Place

the

rear

of

the

key

over

the

spring.

Pull

the

key

slightly

forward

while

pressing

down

at

the

rear.

The

spring

should

be

locked

in

place

at

the

rear

of

the

key.

7.

After

all

keys

are

replaced,

close

thé

front

panel

and

test

the

unit.

Table of Contents