Ensoniq Corporation EPS-16 Plus Service Manual

Keyboard and

Rack

93120013 01-A

Isnscnial@

THE

TEcHNOLOGY

THAT

PERFoRMS

ENSONIQ Customer Service

Hours: Monday through Friday 9:30

AM

to

6:30

PM Eastern

Closed for lunch 12:15 PM

Time

to

1:15PM

NOTES:

Parts ordering

1-800-441-1003

in

U.S. and Canada:

EPS-J6

PLUS Service Manual

Table

of

Contents

Important

1. Getting

2.

Keyboard

3.

The

TABLE

Things to Know About the EPS-16 PLUS:

Around

EPS-16

the

EPS-16

and

Rack Similarities

PLUS Keyboard Assembly and the Rack

OF

CONTENTS

PLUS . . . . . . . . . . . . . . 1

..

. . . . . . . . . . . . . . 1

KPC

Simulator 1

4. The Disk Drive . . . . . . . . . . . . 2

5. Operating System (O.S.) . . . . . . . . 3

6.

Plastic Case

7.

EPS-16

(EPS-16

PLUS

Rack

PLUS

Screws

Keyboard only) 3

..

. 4

8. High Retention Force Connectors 4

Figure 1 -

Communications Figure

Power

Checking Figure AC

Power Figure Transformer and Testing Figure

2 - Communications

Supply

the Power

3 - AC Line Voltage Check Points . 7

Line Voltage Measurements . . . . . . 7

Supply Measurements . .

4 -

the Power Supply Unloaded

5 - Incorrect

Scribe.

Path

Power

. . . . 4

. . . . . . 5

Path

Supply.

Supply Voltage Check Points 8

Power

...

. . . . . 7

...

. . . . 8

..

. . . . . . . . 9

Supply Voltages (flow chart) . 9

Page

5

Display

Display Self-Test

Self-test

Chart.

Mode.

Troubleshooting

Figure Figure 7 - Figure Figure 9 -

Most

EPS-16

1.

2.

3.

4.

5 . Sound

6.

7.

6 - Footswitch

8 -

Commonly

PLUS

Power Load

Keyboard

Disk Mono Output

Asked

Test

Up

in Sounds

Test

Check . . . . . • • . . . . . . . .

Check

MIDI Test

8. Footswitch

9. Analog

10. Sampling

11.

Output

12.

ESP

13.

ESP

Test

Expander Effects Test 1 Effects

. .

.'

. .

Guide.

No

LEDs

Some

LEOs Lit (flow chart) . . .

All

LEDs Lit,

User Questions

. . . . . . . .

problem

Lit

(flow chart) . . .

No

(flow chart)

Display (flow chart)

Procedure:

........

.

............

(EPS-16

. . . . . . . . . . . . .

and

Headphone Test . . . . .

(EPS-16

Test

Page . . . . . .

. . . . . . .

(OEX-6)

Test

2 . . . .

PLUS

PLUS Keyboard Only)

. . . . . .

.....

Keyboard Only) .

Test

10 10

11

12 13 14 15

16 17

.

17 17 17

18 18 18

18

19 19

19

20 20

EPS-16

EPS-J6

PLUS

Burn-in

Test

PLUS Service Manual

Program

Table

21

of

Contents-1

Tableo!

Contents

EPS-16

EPS-16 Figure Keyboard

Rack Only

Figure

Error

Software

Checking Bootup

O.S.

EPS-16

Figure Section A - Replacing the Section B - Replacing the Figure Section C - Replacing the Figure Section D - Replacing the Section E - Replacing the Section F - Replacing the Section G - Replacing the Section H - Replacing the

PLUS

10 - Trace

11

Messages

Disk

Hardware

PLUS

Keyboard

cut

Only

. . . . . . . . . . . .

..............

- Hardware Notes for the Rack .

. . . . . . .

Notes:

the Software Version

ROM Changes . . . .

Version 1.10 Changes

PLUS Keyboard Only Section

12

- EPS-16 PLUS Keyboard. Exploded View

13 -

14

EPS-16

- Bottom

PLUS Button Colors . . . . . . . . .

of

Case

Notes:

and

Rack . . . . . . . . .

for

Rev A, B,

.'.

. . . . .

or

C Main Boards

...

EPS-16 EPS-16

EPS-16 EPS-16 EPS-16 EPS-16

PLUS Main Board . . . .

PLUS Keypad/Display Board.

PLUS Keyboard . . . . .

.............

PLUS

PLUS Transformer . . . . . .

PLUS PitchIMod Wheel Assembly

PLUS Line Filter . PLUS Disk

Power

Drive.

.

Supply Board.

23 23 23 24 24

25

25 25 26

27

28

29 29

30 30

.

31 31

32 32

33

EPS-16

Figure Section A - Replacing the Section B Replacing the Section C - Replacing the Rack KPC Simulator Board. Section D - Replacing the

Section E - Replacing the Rack Transformer . . . .

Section F - Replacing the Section G - Replacing the Section H - Replacing the Rack Disk

Section J - Replacing the

PLUS Rack Only Section

16

-

EPS-16

PLUS Rack Exploded View

Rack

Rack Rack

Rack

......

.

..

Main Board . . . .

Keypad/Display Board.

Power Supply Board

OEX-6 Board . . . Line

Filter.

Drive.

Memory Expander Board . .

. . . .

.

...

. .

Drawings

Figure 1 - Scribe . . . • . . . . . . . .

Figure 2 - Communications Path . . . . . . . . . . .

Figure Figure 4 -

Figure 5 - Incorrect

Figure 6 - Footswitch problem (flow chart) . . . .

Figure 7 Figure 8 Figure 9 Figure Figure

Figure Figure 13 -

Figure

Hgure

3-

10 -

11 - Hardware Notes for the 12-

14 16

AC

Line Voltage Check

Power

No

LEOs

Some Trace EPS-16

EPS-16

- Bottom

-

EPS-16

All

LEDs Lit,

LEDs cut

Supply Voltage Check Points . . . .

Power

Lit

for

PLUS Keyboard Exploded View PLUS

of

PLUS

Supply Voltages (flow chart) .

(flow chart) . . . . . . .

Lit

(flow chart) . . . . . .

No

Display (flow chart) . .

Rev

A,

B,

Button Colors . . . . . . . .

Case

...........

Rack Exploded View

Points.

or

C Main Boards

Rack

. .

only..

. . . . . . . .

..

...

35

36 37

38

39 39

40 40

41

42

4

5

7

8

9

12

13

14

15

23 24

28

30

.

31

36

Table

of

Contents - 2 EPS-16

PLUS

Service Manual

Important

IMPORTANT THINGS TO KNOW ABOUT

IF YOU OONT

As

with every

Module

Exchange replace complete both for you

The

instructions in this manual

unless otherwise noted.

PLUS, substitute a check of When troubleshooting

will

prevent a faulty option

I.

GETTING AROUND THE EPS-16 PLUS

You will

need:

a.

EPS-16

b.

EPS-16

c.

Communications Test Board

d.

EPS-16

READ

ENSONIQ

ANY

OTIIER PART OF TIllS MANUAL, READ TIllS SECTION.

product, all EPS-16 PLUS service will be handled through

Program. Rather than diagnose

mcxlules.

and

your

We feel that this

customers.

are

PLUS PLUS

PLUS

Where

an

EPS-16

from

Operating System (O.S.) Disk Test Disk (including test sounds)

Musician's

the

KPC

simulator board

PLUS,

complicating your troubleshooting.

Manual

is

for both the EPS-16 PLUS Keyboard

instructions

remove

the

THE

EPS-16

PLUS

the

and

exchange individual components, you will

most

time and cost effective method

say

to

check

on

the EPS-16 PLUS Rack.

any

optional modules that might

the

keyboard

of

the

EPS-16

be

present. This

ENSONIQ repair,

and

Rack

2.

KEYBOARD

The Main Board Rack. However, there are physical differences that ordering parts

different .

AND

and

Power Supply board are the

for.

The disk drive

RACK SIMILARITIES

same

will require

is

the

same for both units. The KeypadlDisplay boards

for

both

the

you

..

EPS-16

to

specify

Instead of:a Poly-Key Keyboard assembly (with KPC board), the Rack has a

KPC simulator

The Board (like

"Keyboard assembly," substitute

see

the

The operating system is only EPS-16

The

PLUS Keyboard and

EPS-16

PLUS built-in. These two expanders Kits)

and SCSI (SP-2 Kit) are options for both.

3.

and

The on

the

THE

IEPS-16 PLUS KEYBOARD ASSEMBLY

the

KPC SIMULATOR BOARD

Poly-KeyTM

RaCk)

necessary, you

Main Board

is a frozen display, therefore, could troubleshooting hints, see Communications Path on

board.

KPC

passes information between

board does for

the

Keyboard

KPC

on

the EPS-16 PLUS

unit).

simulator for

O.S.

Rack.

Rack has

the

OEX-6

are

Output Expander and

options for the Keyboard unit. FLASHBANK

Pressure Keyboard assembly on the EPS-16

is a complex

will

be swapping it out

processed

module

throQgh

that contains its

as

a whole

the

Keyboard assemblylKPC simulator. What might appear to

be

a bad Keyboard assemblylKPC simulator. For

own

unit

pp.

the

KeypadIDisplay board

In the rest

the

Rack (except where otherwise noted).

disk. This disk

of

:ME-16

PLUS

this manual, whenever you

is

the

PLUS

(and the

computer and software.

Display information sent

5-6 and

flow

charts on

PLUS

Keyboard and

which

unit

you

are

KPC

simulator board.

and

the

Main

same

for

both the

.

memory expander

(FB-l

KPC

So,

to

and FB-2

siinulator board

when

and

from

more

pp.

9,

and

12-15.

are

the

be

EPS-J6 PLUS Service

Manual

pagel

Important

IMPORT Each version

ANT! Keyboard assembly

of

the

Keyboard assembly EPROM is optimized for the hardware that is within the

EPROM

Version

(EPS-16

PLUS

Keyboard

keyboard assembly. For more information about the Poly-Key Keyboard assembly, see Service

Bulletins

#9B

and

II.

The 2O-pin Ribbon Cable <Keyboard aSsembly/KPC Simulator) When reconnecting this cable

is

and that the cable

F4

on

the power supply board will blow.

not mis-pinned.

to

the Main Board, make sure that the striped side is aligned with

If

the cable ~ mis-pinned

NOTE:

If

one fuse blows, the other will also blow; you

or

installed backward, fuses F3

must replace both.

When installing assembly cable

the main

4.

THE

board

DISK

keyboard assembly back into the

is

flat under the keyboard assembly and that the ferrite bead is not trapped on top

.

DRIVE

EPS-16

PLUS, be sure that the keyboard

the

Transportinl: a unit

on

There is a printed label near the Disk Drive

of

the

information concerning the care

of

all.

SHIP

WITH

the drive

of

AN

regarding the treatment

recommend nothing

PLEASE

IN A BOX

the

in

the drive at

DO

PACKED

insertion

NOT

an

EPS-16

during

actual

EPS-16

PEANUTS.

These peanuts may cause severe damage

every new unit shipped. This label contains important

PLUS Disk Drive and lists recommendations

transport.

disk

during

PLUS

If

you must, wrap the entire unit in plastic first.

to

the Disk Drive

We

do

not,

transport.

under

Transport the

any

OR A REPLACEMENT

or

Keyboard assembly.

circumstances,

unit

DISK

only)

ENSONIQ

pin and

of

only with

DRIVE

1

What disks to use It

is very important to use double-sided, double-density 3.5" micro-floppy disks.

PLUS writes information to every track

quality Testini

and

certified for double-sided use.

the Disk Drive The best way to test the Disk Drive is PLUS

reads

and writes every track

on

a disk, so

by

formatting a disk. When a disk is formatted, the

on

that disk.

it

is imperative that the disk be

If

the formatting attempt fails,

The

EPS-16

of

superior

it

is likely that

EPS-16

the disk itself is faulty. Always try formatting another blank disk before determining that the Disk Drive is faulty.

sectors when formatting. The entire disk must

.

See Hardware Notes.- Rack Only for notes about the Panasonic Disk Drive.

Unlike some computer systems,

the

EPS-16

be

PLUS does not automatically discard bad

good for successful formatting .

page

2

EPS-J6

PLUS

Service

Manual

5.

OPERATING SYSTEM (O.S.)

An

EPS-16 you have more room for sounds. The ENSONIQ Customer Service for the latest O.S. version). You cannot copy the O.S. which you have already saved instruments or sequences, but not the result

To

- Insert the disk containing the O.S. you want to copy (the source disk) into the floppy

- Press Command, then System-MIDI, then 1 (Envl). The display shows COPY OS

-

- Press Enter-Yes. The display says READING

-

- . Press Enter-Yes. The display shows WRITING

in

update O.S. Version on a floppy disk:

DISK.

Press Enter-Yes. The display says MUST ERASE MEMORY, OK?

sounds or sequences, press Cancel-No and save the data before proceeding.

FORMATTED DISK.

Insert the disk onto which you want to copy the to the disk.

PLUS

an error message.

O.S. takes up approximately 170 blocks on a disk

so

without the

O.S.

O.S. version on the disk can be easily updated (call

to

a disk onto

O.S. Attempts to

If

you need

OS

INTO MEMORY, and then INSERT

O.S.

(the destination disk) into the floppy drive.

OS

TO DISK while the

O.S.

do

to

is being copied

so

drive.

save

Important

on

a disk

will

TO

any

\Vhen it's done,

O.S. to another floppy disk, insert another formatted disk and press Enter-Yes. You

this procedure

-

When

6.

PLASTIC CASE (EPS-16 PLUS Keyboard only)

Avoid Because the structural components (Base, Control panel, and Wheel cover)

great care should be exercised when assembling or disassembling any part of the

Strippin~

Avoid over-tightening screws in

you

the

display reads COPY

as

many times

are

done, press Cancel-No.

Screws

as

you like.

OS

DONE. ANOlHER?

the

plastic case when executing any

If

you want to copy the

are

made

EPS-16

repair

can

of

procedure!

\Vhen replacing hole in the case, making happening, follow these procedures:

a. Before replacing a self-tapping screw

LOCKTITE, Super Glue Gel,

b.

Install the

case. Do not tighten the screw any further. When the glue sets, the screws will hold sub-assembly tightly

It is important and short out something.

any

of

the self-tapping screws,

it

necessary to replace the case

or

RTV into the hole.

screw,

to

and tighten it only until the sub-assembly being attached

in

place.

make sure that there are no loose screws inside the unit,

it

is possible to over-tighten the screws and

or

control panel. To keep this from

(or

screws) into a stripped hole, put a drop

is

as

they may

or

snug against

come

same

repeat

plastic,

PLUS.

strip

two of

the

loose

a

the

Brass Inserts

To

prevent stripping, there are brass inserts

in the four control panel holes. Be sure to use machine screws in these locations.

in

the Main Board ground boss (mounting standoff)

self-tapping screw in a brass insert as this will ruin the insert.

EPS-16

PLUS Service Manual

Do

not

use

a

page 3

and

Important

7 .

EPS-16

Because

disassembling

than 8 inchllbs

8.

HIGH-RETENTION FORCE CONNECTORS (Repair Technicians Label)

In

all

EPS-16

We

just transformers. recommend

benefits

PLUS We

This

using the angled end

These

• Techno-Tool catalog 38, page

•

harness. Watch

have

may

can

Newark

PLUS

the

Control Panel is an aluminum extrusion, great care should

any

PLUS

wanted to let you know that

This

the

of

a high-retention force connector,

found that some units have developed further problems once a module has been changed.

be

a result

be found in the following catalogs:

catalog lID, page 1024, part number 76-1510

RACK SCREWS

part

of

it

of

torque and try

Racks and

means

use

it

will

of

a scribe, screwdriver

out

for thein, and please don't

of

improper handling

of

a scribe (see below).

be

taken when assembling

To

avoid stripping and

to

install the screws into the existing holes in the panel.

in

later Keyboards, there

we

have switched to a higher retention force connector

be very difficult to remove this connector by

or

we

of

cables.

- - ,

Figure

204, part number

to

aid

in

is

similar object

will

be

adding them in other places on the

pull

on

We

suggest removing all cable connectors

1-

Scribe

400PRI44

alignment, you should

warning{mformation label

to

remove this connector.

the wires!

just

pulling.

use

just

no

for We

Due

EPS-16

more

you.

on

our

to

the

,

or

page

4

EPS-J6

PLUS Service Manual

Communications

COMMUNICATIONS PATH

It

is

imponant

Please read this carefully.

The

EPS-16 computer modules communicate with each other using serial communication on

the Keyboard, for example, the Keyboard assembly microprocessor transmits this infonnation

the microprocessor on the Main Board.

The

KeypadlDisplay Board communicates with the Main Board through the Keyboard assembly.

Whenever

Keyboard

control panel, the

turn,

passes

The

communications path

assembly over a two-line asynchronous interface carried cable. 'The Keyboard assembly communicates with the Keypad/Display Board over a three-line synchronous interface which is carried over to the the Keypad/Display Board via the 7-pin Display cable on the cable

on

that you completely understand the communications

PLUS

Main Board, KeypadlDisplay Board

systems in themselves, each with its

the Main Board wants to put a message on the Display,

assembly which then passes

KeypadlDisplay Board sends the message to the Keyboard assembly which, in

it

on to the Main Board.

is

shown in Figure 2. The Main Board communicates with

the

EPS-16

PLUS Rack.

it

own

on

to the Display. Whenever a button is

Main Board via the 20-pin ribbon

and

microprocessor and operating software. The

by

the 20-pin Keyboard

path

of

the

EPS-J6

Keyboard assembly are complete

ports. Whenever a

it

sends the message

assembly

EPS-16

PLUS and the

PLUS.

key

is played

to

the

pressed

cable,

on the

the

Keyboard

ribbon

then

10-pinDispiay

Path

to

up

to

Due

to

the complexity fault when a communications problem occurs. Board,

Test Disk and Bum-in Test Disk are available.

KEYPAD/DISPLA Y BOARD

MAIN BOARD

of

the modules involved,

2O-PIN

RIBBON

CABLE

KEYBOARD!

,

KPC

SIMULATOR

Figure

If

a communication problem occurs (i.e.,

could

be something as simple as a

?f

the

modules. To help you identify a faulty module, a special Communication Test mcluded operation Keyboard

available from ENSONIQ Customer Service. The Communication Test

of

the

Keyboard assembly and can be used

assembly for troubleshooting.

ibad

2 -Communications Path

no

ribbon cable

it

is often difficult

To

facilitate troubleshooting, a Communication

IN

DATA

our

DATA

to

detemrlne which module is

DATA DATA

IN

our

J

,0

()

4)

C

CLOCK

our

7-PIN

CABLE

0115

(~

112

DISPLAY

, ,

,

DATA

our IN

ASYNCHRONOUS

display or no response

DATA

FORT

or

Display cable,

as

DATA

SYNCHRONOUS

~\..

a "known good" module in

our

,

\

DATA

to

or

CLOCK.

IN IN

PORT

button presses

it

could be a

~

Board

or

keys),

problem

Board

simulates

place

of

in

is

the

at

Test

it

one

the

EPS-J6

PLUS

Service Manual

page 5

Communications

IMPORTANT!

When

using Handle the

board shan

the

Communication

board

out

Path

by

the

when

edges

testing,

Test

Board,

and store it

place

an

keep

in

the

anti-static shipping

insulator

in

mind that it is sensitive

bag

(cardboard,

paper,

to

static discharge.

when

not in use.

etc.)

underneath it.

Do

not

let

Attaching the Communications Test

If

an

EPS-16

Keyboard assembly ribbon cable from the Main Board at

from

cable variable. assembly See the

There is and Keypad/Display Board is routed through the Main Board, there is a remote possibility

printed circuit connections between the two connectors

that has a problem communicating with its KeypadlDisplay Board, you may want to between

from the Main

flow

Board

PLUS has a communications problem,

the Communication Test Board into 112. This will eliminate the Keyboard assembly as a

Turn

the system on.

is

not at fault

charts on pp. 12-15 for troubleshooting procedures.

one

funher complication. Since the communications

the

connectors on the Main

EPS-16

PLUS Main Board

atJl5.

If

communication is restarted, however, the Keyboard assembly is at fault.

Using an Ohmmeter, verify continuity between the following points

Board

turn

the unit

-connector 112. Plug the

If

the communications problem persists, you know

are

defective.

Board

at

112

Turn

and

off

the

power

EPS-16

path

and

PLUS

off

and unplug the 20-pin

between the Keyboard assembly

If

you have

unplug the 2O-pin ribbon cable

7-pin Display

20-pin

the

an

EPS-16

verify

cable

Keyboard

from the

Board:

20-pin Keyboard Connector

1

3

PinS

7 -pin DisPlay Connector to

1

to

2

to

3

ribbon

that the

PLUS

continuity

on

the Main

page 6

EPS-J6 PLUS Service Manual

CHECKING THE POWER SUPPLY

Many You

EPS-16

PLUS problems may be related

should check these before troubleshooting the rest

EPS-J6 PLUS

to

a faulty Power Supply, Transformer

of

the unit.

Power

or

Line Filter.

Circuitry

Check and

to

make sure that all the cable connections are secure and correct. Plug the

turn

it

on.

Mter

the

EPS-16

the points shown in Figures 3

procedure described under

Green

TESTING

PLUS has warmed up for five minutes, begin

and

4~

If

the voltages vary outside the allowable limits, follow the

TIlE

POWER SUPPLY UNLOADED before replacing

Line

Filter

Top

Lug

@

NOTE:

come of

the

Figure3

AC

Line Voltage

EPS-16

to

test

WARNING!

There

are

dangerous

Voltages

this

from

transfonner.

To

All

area.

Power

wires

the

present

bottom

-

Check

the

in

",nT""'"

PLUS

voltages

Points

in

at

it

AC

LINE

VOLTAGE

With the power switch OFF,

the proper

AC

Line Voltage

should read from:

2B-IA, 2B-2A, 2B-3B

MEASUREMENTS

(see Figure 3)

With the power switch ON,

the

proper

AC

Line Voltage should read

2B-IA, 2B-IB, 2B-3B, 2B-3A

There should be no voltage across the

from:

power

switch.

EPS-J6

PLUS Service Manual

page

7

EPS-J6

PLUS Power Circuitry

POWER The voltage and part number Transformer.

SUPPLY

The

Power Supply part number is silk-screened on the left side

MEASUREMENTS

of

the Transfonner is denoted by the label on the top

of

the

of

the Power Supply

PC board.

I F2 J

1.5

Amp,

25

v

I

FI

dAmp,25 V

~

F5

The Transformer part numbers for the EPS-16 PLUS are:

100V 1450000622 230V 1450000252 120V 1450000242 240V 1450000832

TRANSFORMER The proper AC Line Voltage for each EPS-16 PLUS should

AND

POWER

SUPPLY

VOLTAGE

be

CHECK

printed on the top

POINTS

of

the Transformer. Figure 3 shows the checkpoints for reading the AC Line Voltage. Figure 4 shows the connector terminal numbers for the Power vary +/-

10%.

Supply and Transformer. It is normal for Line Voltage to

The following chart lists the voltage ranges for proper operation appropriate terminals

De~i&nali2n

to

read across with the volt meter (refer

I~rmiDals

CQDD~s:tQ[

to

AIIQ!fa.bI~

+

Digital

Analog

Display +VA

-VA +5 Analog +VDigital +5 Memory +5 Digital

+5X

-35 FIlament Display Offset

+.5X

Supply

Fllament

1 4 7

10 12 14 15 16 18

3 6

9

11 11

13 13 13 17

24 23 25 23 27 28 27 26

J4

13.00 J4 22.00 J4

J1 J1 J1

11 11 11

13

J3 J3 J3

4.70

+20.00

-20.00 +4.75 +7.20 +4.75 +4.75

+4.75

-29.00

4.70

-22.70

19 20 J2 +4.75

of

each supply (fully loaded) and the

Figure 4 for terminal locations):

[aD&~

18.70 VACrms

to

28.60

to

6.05 VACrms

to

+28.00

to

-28.00

to

+5.25

to

+12.10

to

+5.25

to

+5.25

to

+5.25

to

-37.20

to

6.05

to

-31.50

to to +5.25

Units

VACnns

VDC VDC VDC VDC VDC VDC

VDC VDC

VACnns

VDC VDC

page 8

EPS-J6 PLUS Service Manual

EPS-J6

PLUS

Power

Circuitry

TESTING

If

the

Power

THE

Supply tenninals 18 and component

Power

on

SuppIy unloaded before proceeding.

Tum

Verify

POWER SUPPLY UNLOADED

readings exceed the indicated tolerance (particularly the +5 Digital

17

or

+5

Memory line between terminals 16 and 13)

the

Main

Board

Incorrect

present

Tum

the

main

power supply voltages

the

unit

OFF

the

Turn the unit ON.

the

unit OFF. Disconnect

Keyboard cable from the

board. Turn the unit ON.

is drawing the Power Supply down.

Check the fuses.

proper Line Voltage is

YES

INCORRECT

SUPPLY VOLT AGES

===_---NO--

it

is possible that a defective

In

this case, you

....

~~An

better nowJ

line

should

POWER

between

test

the

YES

Turn

the

unit

OFF.

Disconnect the cable

between

Keypad/Display Board.

Tmn

cable

the main board.

the

the unit

between

power supply and the

YES

OFF.

the

power supply and

Tmn

the unit

==----NO

Disconnect the

the unit ON.

==---NO---1~

ON.

( Replace

...

NO

---IPl~

Simulator (see Section C). .

~

Board

the

Keyboard/KPC)

Replace

Keypad/DisplayBoard

(see Section B).

Replace the

(see

the

Main

Section

A).

EPS-J6

YES

Replace the Power Supply

Board (see Section

PLUS Service Manual

D).

Figure 5 -

Incorrect Power

Supply Voltages

page

9

Display Self-Test Mode

DISPLAY

When communication with the test mode, the Display remains various control panel buttons will cause the Display to print characters, home the cursor, etc.

Using

1.

If

prints

indicates the problem is either the Main Board Board, Keyboard assembly and the KeypadlDisplay connections, particularly the 20-pin cable to the Keyboard assembly.

If

pressing buttons indicates a defective cable connection (20-pin ribbon cable) between the Keyboard

2.

If

chart not Self-test mode.

If

you

mode using the follOwing procedure. With the power off, face the front

SELF·TEST

the KeypadlDisplay is receiving power from the Power Supply but is not in proper

Self·test

the

unit

out

the

unit

below, the problem is most likely in the KeypadlDisplay

function properly during normal

can't isolate a problem that seems related to the display, the display can be forced into Self-test

Mode

comes

characters when control panel buttons are pressed according to the chart below) this

assembly or possibly a bad Keyboard assembly.

is

in

MODE

Main Board, the K.eypad/Display Board enters Self·test

blank:

until you press the buttons on the control panel. Pressing

to

Diagnose

in

with a blank

ca~ses

Self·test

only the leftmost character

mode

the

Keypad/Display

display,

but

the

EPS-16

Assembly

but

is

in

Self·test

or

the communication link between the Main

Board

of

display

PLUS operation, test them while the display is

Before replacing anything, check all

the display to change, this usually

does

not

respond

Board

of

mode

Main Board and

If

the unit, then:

mode.

(i.e., the Display

according

certain buttons

In Self-

to

the

do

in

Jumper the left power the Keypad/Display Board independently.

The Chart below details how the control panel buttons are mapped in

up, the display will stay

Eri:ss:

LOAD

COMMAND EDIT INS1RUMENT

SEQ-SONG SYSTEM:-M1DI EFFECTS

l/ENV 2/Er:..c"'V2 3/ENV3

4/PITCH

5lFILTER

61AMP

71LFO 8/WAVE

9/LAYER O/I'RACK UpArrow

1

(-)

side

DiSula!

of

C19 (located below the MIDI

in

Self-test as long as the

Bi:ads:

8

$

1.

3 9

+

0 Instrument-Track 4

1

Pri:SS: Down Arrow Left Arrow Right Arrow CANCEL-NO

EIDER-YES Instrument-Track 1 Instrument-Track 2

Instrument-Track 3 ,

Instrum.ent-Track 5

Out

jack) to pin 13

jumper

is connected, allowing you to check

6 Instrument-Track 6 (Home Cursor)

7 Instrument-Track 7

<

=

(Home Cursor) (Home Cursor)

*

3.

Instrument-Track 8 EFFEcr SAMPLE

SELEcr-BYPASS

RECORD

STOP/CONTINUE PLAY

of

U20

Self-test mode:

DiSula!

Ri:ads:

4.

.

/

?

(Home Cursor) Space

&

2

"

5.

4

2.

>

o.

5

6.

(WD

1772).

On

pageJO

EPS-J6

PLUS Service Manual

TROUBLESHOOTING GUIDE

Often is dead

the

faulty module

difficult to isolate the problem. The following flowcharts can help you diagnose

(no

display).

in

an

EPS-16

PLUS can be determined through normal use. Sometimes,

Troubleshooting Guide

it

units

that appear

When present prevent

Memory

procedure

The

Troubleshooting

If

the

troubleshooting an

(such

as

the memory expander, SCSI Interface or

a faulty expander from complicating your troubleshooting. The procedures

Expander and the SCSI Interface are included with the corresponding expander. The

for testing the

following pages include troubleshooting flow charts:

~Problem

9 Incorrect Power Supply Voltages

12 Footswitch problems

13

14 15

one

or

both of the footswitches do not operate properly, make sure that the footswitches

proper

mode (on the Edit/System·MIDI page). See Section 2

an

EPS-16

OEX-6

EPS-16 EPS-16 EPS-16

EPS-16

PLUS, always disconnect any expansion devices

OEX~

can

be

found

on

p. 19.

PLUS with PLUS with Some LEDs Lit PLUS with

No

LEDs Lit

All

LEDs Lit,

Output Expander). This

No

Display

PLUS with a Footswitch Problem (see

of

the

EPS-16

Manual) for more information. .

The

SUSTAIN SW-l. is

On

The

the

Dual

the Edit/S MIDI system· . page:

Fr

SWITCH parameter corresponds to the right pedal

AUX

FT

SWITCH parameter corresponds to the left pedal

Footswitch (piano-type) available from ENSONIQ. .

Footswitch

SUSTAIN

SW

-1 single footswitch,

. SW-5 right pedal

FT

SWITCH

or

AUX

SW

-5 left pedal

of

SW-5

of

SW-5

FT

SWITCH

or

that

for

Figure

PLUS

single

only.

may be

will

testing the

6) are

set

Musician's

pedal

The

SW-5

to

Default

Option

If

the

footswitch mode is correct and the footswitch still doesn't function properly,

problem

Although the footswitch to.

the

mlcroprocessor.

with the

KeyboardIKPC by the 2()-pin ribbon cable, where they are sensed by the KeyboardIKPC

Main

right

Board, the

jack

is

EPS-16 PLUS Service Manual

SUSTAIN

PATCH SL button

- left PATCH SEL button

KeyboardIKPC

mounted on the

OFF

sequencer

or

the 2O-pin ribbon cable

Main

Board, the footswitch signals are carried

START/STOP

connecting

there

is either a

the two.

over

page

11