ENSONIQ EPS-16 PLUS Service manual

PIN

93120013 01-A

Keyboard and Rack

Isnscnial@

THE

TEcHNOLOGY THAT PERFoRMS

ENSONIQ Customer Service

Hours:

Monday through Friday

9:30 AM to 6:30 PM Eastern Time

Closed for lunch 12:15 PM to 1:15PM

NOTES:

Parts ordering in U.S. and Canada:

1-800-441-1003

EPS-J6 PLUS Service Manual

Table of Contents

TABLE OF CONTENTS

Important Things to Know About the EPS-16 PLUS:

1.

Getting Around the EPS-16 PLUS . . . . . . . . . . . . . .

2. Keyboard and Rack Similarities .. . . . . . . . . . . . . . .

3. The EPS-16 PLUS Keyboard Assembly and the Rack KPC Simulator

4.

The Disk Drive . . . . . . . . . . . .

5.

Operating System (O.S.) . . . . . . . .

6. Plastic Case (EPS-16 PLUS Keyboard only)

7.

EPS-16 PLUS Rack Screws . . .

8.

High Retention Force Connectors

Figure 1 Scribe. . . . .

Communications Path . . . . . .

Figure 2 Communications Path

Power Supply

Checking the Power Supply. ... . . . . .

Figure 3 AC Line Voltage Check Points .

AC Line Voltage Measurements . . . . . .

Power Supply Measurements . . ... . . . .

Figure

4 -

Power Supply Voltage Check Points

Transformer and Power Supply Voltage Check Points

Testing the Power Supply Unloaded . . . . . . . . . .

Figure

5 -

Incorrect Power Supply Voltages (flow chart) .

Display

Display Self-test

Mode. . .

Self-Test Chart. . . .' . .

Troubleshooting Guide. . . . . . . . .

Figure 6 Footswitch problem (flow chart)

Figure

7 -

No LEDs Lit (flow chart) . . .

Figure

8 -

Some LEOs Lit (flow chart) . . .

Figure 9 All LEDs Lit, No Display (flow chart)

Most Commonly Asked User Questions

EPS-16 PLUS Test Procedure:

1. Power Up . . . . . . . . .

2.

Load in

Sounds . . . . . . . . . . . . .

3. Keyboard Test (EPS-16 PLUS Keyboard Only) .

4. Disk Check . . . . . • • . . . . . . . .

5 .

Sound Check . . . . . . . . . . . . .

6. Mono Output and Headphone Test . . . . .

7. MIDI

Test (EPS-16 PLUS Keyboard Only)

8.

Footswitch Test . . . . . .

9.

Analog Test Page . . . . . .

10.

Sampling Test . . . . . . .

11. Output Expander (OEX-6) Test

12. ESP Effects Test 1 . . . . .

13. ESP Effects Test 2 . . . .

EPS-16 PLUS Burn-in Test Program


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Table of Contents-1

Tableo! Contents

EPS-16 PLUS Hardware Notes:

EPS-16 PLUS Keyboard and Rack . . . . . . . . .

Figure 10 Trace cut for Rev A, B, or C

Main

Boards

Keyboard Only . . . . . . . . . . . .

Rack

Only . . . . . . . . . . . . . . .

Figure 11 Hardware Notes for the Rack .

Error Messages

.

. . . . . .

.'.

.

. .

.

.

Software

Notes:

Checking the Software Version

Bootup ROM Changes . . . .

O.S.

Disk Version

1.10

Changes

EPS-16 PLUS Keyboard Only Section . . .

Figure 12 EPS-16 PLUS Keyboard. Exploded View

Section A Replacing the EPS-16 PLUS Main Board . . . .

Section

B -

Replacing the EPS-16 PLUS Keypad/Display Board.

Figure

13 -

EPS-16 PLUS Button Colors . . . . . . . . .

Section

C -

Replacing the EPS-16 PLUS Keyboard . . . . .

Figure 14 Bottom of Case . . . . . . . . . . . . . .

Section

D -

Replacing the EPS-16 PLUS Power Supply Board.

Section

E -

Replacing the EPS-16 PLUS Transformer . . . . . .

Section F Replacing the EPS-16 PLUS PitchIMod Wheel Assembly

Section

G -

Replacing the EPS-16 PLUS Line Filter .

Section

H -

Replacing the EPS-16 PLUS Disk Drive.

EPS-16 PLUS Rack Only Section . . . . . . .

Figure 16 EPS-16 PLUS Rack Exploded View . .

Section A Replacing the Rack

Main

Board . . . .

Section

B

Replacing the Rack Keypad/Display Board.

Section

C -

Replacing the Rack KPC Simulator Board.

Section

D -

Replacing the Rack Power Supply Board

Section

E -

Replacing the Rack Transformer . . . .

Section

F -

Replacing the Rack OEX-6 Board . . .

Section

G -

Replacing the Rack Line

Filter. . . . .

Section H Replacing the Rack Disk Drive. . ... . .

Section

J -

Replacing the

Rack

Memory Expander Board . .

Drawings

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

Figure

2 -

Communications Path . . . . . . . . . . .

Figure

3 -

AC Line Voltage Check Points. . .

Figure 4 Power Supply Voltage Check Points . . . .

Figure 5 Incorrect Power Supply Voltages (flow chart) .

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

Figure 7 No LEOs Lit (flow chart) . . . . . . .

Figure 8 Some LEDs Lit (flow chart) . . . . . .

Figure 9 All LEDs Lit, No Display (flow chart) . .

Figure

10 -

Trace cut for Rev A, B, or C Main Boards

Figure 11 Hardware Notes for the Rack only.. . . . . . . . .

Figure 12EPS-16 PLUS Keyboard Exploded View

Figure 13 EPS-16 PLUS Button Colors . . . . . . . .

Figure 14 Bottom of Case . . . . . . . . . . . . . . .

Hgure 16 EPS-16 PLUS Rack Exploded View . .

Table of Contents -

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EPS-16 PLUS Service Manual

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Important

IMPORTANT THINGS TO KNOW ABOUT THE EPS-16 PLUS

IF YOU OONT READ ANY OTIIER PART OF TIllS MANUAL, READ TIllS SECTION.

As with every ENSONIQ product, all

EPS-16 PLUS service will be handled through the ENSONIQ

Module Exchange Program. Rather than diagnose and exchange individual components, you will replace complete mcxlules. We feel that this is the most time and cost effective method of repair, both for you and your customers.

The instructions in this manual are for both the EPS-16 PLUS Keyboard and Rack unless otherwise noted. Where the instructions say to check the keyboard of the EPS-16

PLUS, substitute a check of the KPC simulator board on the EPS-16 PLUS Rack.

When troubleshooting an EPS-16 PLUS, remove any optional modules that might be present. This will prevent a faulty option from complicating your troubleshooting.

I. GETTING AROUND THE EPS-16 PLUS

You will need: a. EPS-16 PLUS Operating System (O.S.) Disk b. EPS-16 PLUS Test Disk (including test sounds) c. Communications Test Board d. EPS-16 PLUS

Musician's Manual

2.

KEYBOARD AND RACK SIMILARITIES

The Main Board and Power Supply board are the same for both the EPS-16 PLUS Keyboard and

Rack. However, there are physical differences that will require you to specify which unit you are ordering parts for. The disk drive is the same for both units. The KeypadlDisplay boards are different . . .

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

The KPC simulator board. passes information between the KeypadIDisplay board and the

Main

Board (like the KPC board does for the Keyboard unit). In the rest of this manual, whenever you see "Keyboard assembly," substitute KPC simulator for the Rack (except where otherwise noted).

The operating system is only on the EPS-16 PLUS O.S. disk. This disk is the same for both the

EPS-16 PLUS Keyboard and Rack. .

The EPS-16 PLUS Rack has the OEX-6 Output Expander and :ME-16 PLUS memory expander built-in. These two expanders are options for the Keyboard unit. FLASHBANK (FB-l and FB-2

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

3.

THE IEPS-16 PLUS KEYBOARD ASSEMBLY and the KPC SIMULATOR BOARD

The Poly-KeyTM Pressure Keyboard assembly on the EPS-16 PLUS (and the KPC siinulator board on the RaCk) is a complex module that contains its own computer and software. So, when necessary, you will be swapping it out as a whole unit

Display information sent to and from the

Main

Board is processed throQgh the Keyboard assemblylKPC simulator. What might appear to be a frozen display, therefore, could be a bad Keyboard assemblylKPC simulator. For more troubleshooting hints, see Communications Path on pp. 5-6 and flow charts on pp. 9, and 12-15.

EPS-J6 PLUS Service Manual pagel

Important

IMPORT ANT! Keyboard assembly EPROM Version (EPS-16 PLUS Keyboard only)

Each version of the Keyboard assembly EPROM is optimized for the hardware that is within the keyboard assembly. For more information about the Poly-Key Keyboard assembly, see ENSONIQ

Service Bulletins #9B and II.

The 2O-pin Ribbon Cable <Keyboard aSsembly/KPC Simulator)

When reconnecting this cable to the Main Board, make sure that the striped side is aligned with pin 1 and that the cable is not mis-pinned.

If the cable mis-pinned or installed backward, fuses F3 and

F4 on the power supply board will blow. NOTE:

If one fuse blows, the other will also blow; you must replace both.

When installing the keyboard assembly back into the EPS-16 PLUS, be sure that the keyboard assembly cable is flat under the keyboard assembly and that the ferrite bead is not trapped on top of the main board .

4. THE DISK DRIVE

Transportinl: a unit

There is a printed label near the Disk Drive on every new unit shipped. This label contains important information concerning the care of the EPS-16 PLUS Disk Drive and lists recommendations regarding the treatment of the drive during transport. We do not, under any circumstances, recommend the insertion of an actual disk during transport. Transport the unit only with nothing in the drive at all.

PLEASE DO NOT SHIP AN EPS-16 PLUS OR A REPLACEMENT DISK DRIVE

IN A BOX PACKED WITH PEANUTS.

If you must, wrap the entire unit in plastic first.

These peanuts may cause severe damage to the Disk Drive or Keyboard assembly.

What disks to use

It is very important to use double-sided, double-density 3.5" micro-floppy disks. The EPS-16

PLUS writes information to every track on a disk, so it is imperative that the disk be of superior quality and certified for double-sided use.

Testini the Disk Drive

The best way to test the Disk Drive is by formatting a disk. When a disk is formatted, the EPS-16

PLUS reads and writes every track on that disk.

If the formatting attempt fails, it is likely that the disk itself is faulty. Always try formatting another blank disk before determining that the Disk Drive is faulty. Unlike some computer systems, the EPS-16 PLUS does not automatically discard bad sectors when formatting. The entire disk must be good for successful formatting .

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

page

2


Important

5. OPERATING SYSTEM (O.S.)

An EPS-16 PLUS O.S. takes up approximately 170 blocks on a disk so without the

O.S.

on a disk you have more room for sounds. The

O.S.

version on the disk can be easily updated (call

ENSONIQ Customer Service for the latest O.S. version). You cannot copy the O.S. to a disk onto which you have already saved instruments or sequences, but not the O.S. Attempts to do so will result in an error message.

To update O.S. Version on a floppy disk:

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

Press

Command,

then

System-MIDI,

then 1 (Envl). The display shows COPY OS TO

DISK.

Press

Enter-Yes.

The display says MUST ERASE MEMORY, OK?

If you need to save any sounds or sequences, press

Cancel-No

and save the data before proceeding.

Press

Enter-Yes.

The display says READING OS INTO MEMORY, and then INSERT

FORMATTED DISK.

Insert the disk onto which you want to copy the O.S. (the destination disk) into the floppy drive.

. Press

Enter-Yes.

The display shows WRITING OS TO DISK while the

O.S.

is being copied to the disk.

\Vhen it's done, the display reads COPY OS DONE. ANOlHER? If you want to copy the same

O.S.

to another floppy disk, insert another formatted disk and press

Enter-Yes.

You can repeat this procedure as many times as you like.

When you are done, press

Cancel-No.

6. PLASTIC CASE (EPS-16 PLUS Keyboard only)

Avoid

Strippin~

Screws

Because the structural components (Base, Control panel, and Wheel cover) are made of plastic,

great care

should be exercised when assembling or disassembling any part of the EPS-16 PLUS.

Avoid over-tightening screws in the plastic case when executing any repair procedure!

\Vhen replacing any of the self-tapping screws, it is possible to over-tighten the screws and strip a hole in the case, making it necessary to replace the case

or

control panel. To keep this from happening, follow these procedures: a. Before replacing a self-tapping screw

(or

screws) into a stripped hole, put a drop or two of

LOCKTITE, Super Glue Gel,

or

RTV into the hole. b. Install the

screw,

and tighten it only until the sub-assembly being attached is snug against the case.

Do not tighten the screw any further.

When the glue sets, the screws will hold the sub-assembly tightly in place.

It is important to make sure that there are no loose screws inside the unit, as they may come loose and short out something.

Brass Inserts

To prevent stripping, there are brass inserts in the Main Board ground boss (mounting standoff) and in the four control panel holes. Be sure to use machine screws in these locations.

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

Do not use a

EPS-16 PLUS Service Manual page

3

Important

7 . EPS-16 PLUS RACK SCREWS

Because the Control Panel is an aluminum extrusion, great care should be taken when assembling or disassembling any part of it To avoid stripping and to aid in alignment, you should use no more than 8 inchllbs of torque and try to install the screws into the existing holes in the panel.

8.

HIGH-RETENTION FORCE CONNECTORS (Repair Technicians Label)

In all EPS-16 PLUS Racks and in later Keyboards, there is warning{mformation label just for you.

We just wanted to let you know that we have switched to a higher retention force connector on our transformers.

This means it will be very difficult to remove this connector by just pulling. We recommend the use of a scribe, screwdriver or similar object to remove this connector. Due to the benefits of a high-retention force connector, we will be adding them in other places on the EPS-16

PLUS harness. Watch out for thein, and please don't pull on the wires!

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

This may be a result of improper handling of cables. We suggest removing using the angled end of a scribe (see below).

- -

,

Figure

1-

Scribe

These can be found in the following catalogs: all cable connectors

,

• Techno-Tool catalog 38, page 204, part number 400PRI44

• Newark catalog lID, page 1024, part number 76-1510

page

4


Communications Path

COMMUNICATIONS PATH

It is imponant that you completely understand the communications path of the EPS-J6 PLUS.

Please read this carefully.

The EPS-16 PLUS Main Board, KeypadlDisplay Board and Keyboard assembly are complete computer systems in themselves, each with its own microprocessor and operating software. The modules communicate with each other using serial communication ports. Whenever a key is played on the Keyboard, for example, the Keyboard assembly microprocessor transmits this infonnation to the microprocessor on the Main Board.

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

Whenever the Main Board wants to put a message on the Display, it sends the message to the

Keyboard assembly which then passes it on to the Display. Whenever a button is pressed on the control panel, the KeypadlDisplay Board sends the message to the Keyboard assembly which, in turn, passes it on to the Main Board.

The communications path is shown in Figure 2. The Main Board communicates with the Keyboard assembly over a two-line asynchronous interface carried by the 20-pin Keyboard assembly ribbon cable. 'The Keyboard assembly communicates with the Keypad/Display Board over a three-line synchronous interface which is carried over to the

Main

Board via the 20-pin ribbon cable, then up to the Keypad/Display Board via the 7-pin Display cable on the EPS-16 PLUS and the 10-pinDispiay cable on the EPS-16 PLUS Rack.

Due to the complexity of the modules involved, it is often difficult to detemrlne which module is at fault when a communications problem occurs. To facilitate troubleshooting, a Communication Test

Board, Test Disk and Bum-in Test Disk are available.

KEYPAD/DISPLA Y BOARD

DATA DATA

CLOCK

IN

our

our

MAIN BOARD

2O-PIN RIBBON

CABLE

KEYBOARD!

, KPC SIMULATOR

DATA DATA

IN our

,

,

,

J

7-PIN DISPLAY

CABLE

,0

()

0115

(~

112

C

4)

,

\

DATA DATA DATA DATA

CLOCK.

our

IN our

IN IN

ASYNCHRONOUS SYNCHRONOUS PORT

FORT

~\..

~

Figure 2 -Communications Path

If a communication problem occurs (i.e., no display or no response to button presses or keys), it could be something as simple as a ibad ribbon cable or Display cable, or it could be a problem in one

?f the modules. To help you identify a faulty module, a special Communication Test Board is mcluded available from ENSONIQ Customer Service. The Communication Test Board simulates the operation of the Keyboard assembly and can be used as a "known good" module in place of the

Keyboard assembly for troubleshooting.

EPS-J6 PLUS Service Manual page

5

Communications Path

IMPORTANT!

When using the Communication Test Board, keep in mind that it is sensitive to static discharge.

Handle the board by the edges and store it in the anti-static shipping bag when not in use. Do not let the board shan out when testing, place an insulator (cardboard, paper, etc.) underneath it.

Attaching the Communications Test Board

If an EPS-16 PLUS has a communications problem, turn the unit off and unplug the 20-pin

Keyboard assembly ribbon cable from the Main Board at -connector 112. Plug the 20-pin ribbon cable from the Communication Test Board into 112. This will eliminate the Keyboard assembly as a variable. Turn the system on. If the communications problem persists, you know the Keyboard assembly is not at fault

If

See the flow charts on pp. 12-15 for troubleshooting procedures.

There is one funher complication. Since the communications path between the Keyboard assembly and Keypad/Display Board is routed through the Main Board, there is a remote possibility that the printed circuit connections between the two connectors are defective.

If you have an EPS-16 PLUS that has a problem communicating with its KeypadlDisplay Board, you may want to verify continuity between the connectors on the Main Board Turn off the power and unplug the 2O-pin ribbon cable from the EPS-16 PLUS

Main

Board at 112 and the EPS-16 PLUS 7-pin Display cable from the

Main Board atJl5. Using an Ohmmeter, verify continuity between the following points on the Main

Board:

20-pin Keyboard Connector

Pin

1

Pin

3

PinS

7 -pin DisPlay Connector to Pin 1 to Pin

2 to Pin 3

page

6


EPS-J6 PLUS Power Circuitry

CHECKING THE POWER SUPPLY

Many EPS-16 PLUS problems may be related to a faulty Power Supply, Transformer or Line Filter.

You should check these before troubleshooting the rest of the unit.

Check to make sure that all the cable connections are secure and correct. Plug the EPS-16 PLUS in and turn it on. Mter the EPS-16 PLUS has warmed up for five minutes, begin to test the voltages at the points shown in Figures 3 and

4~

If the voltages vary outside the allowable limits, follow the procedure described under TESTING TIlE POWER SUPPLY UNLOADED before replacing it

Line

Filter

Top

Lug

@

WARNING!

There are dangerous

Voltages present in this area.

To Power

",nT""'"

NOTE: All wires come from the bottom of the transfonner.

Green

Figure3 -

AC

Line Voltage Check Points

AC LINE VOLTAGE MEASUREMENTS (see Figure 3)

With the power switch OFF, the proper AC

Line Voltage should read from:

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

With the power switch ON, the proper AC

Line Voltage should read from:

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

There should be no voltage across the power switch.


7


POWER SUPPLY MEASUREMENTS

The voltage and part number of the Transfonner is denoted by the label on the top of the

Transformer. The Power Supply part number is silk-screened on the left side of the Power Supply

PC board.

I

F2

Amp,

25

J

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 AND POWER SUPPLY VOLTAGE CHECK

POINTS

The proper AC Line Voltage for each EPS-16 PLUS should be printed on the top of the

Transformer. Figure 3 shows the checkpoints for reading the AC Line Voltage. Figure 4 shows the connector terminal numbers for the Power Supply and Transformer. It is normal for Line Voltage to vary +/- 10%.

The following chart lists the voltage ranges for proper operation of each supply (fully loaded) and the appropriate terminals to read across with the volt meter (refer to Figure 4 for terminal locations):

De~i&nali2n

Digital Supply

I~rmiDals CQDD~s:tQ[ AIIQ!fa.bI~ [aD&~

+

1

Analog Supply 4

3

6

J4

J4

13.00

22.00 to to

18.70

28.60

Units

VACrms

VACnns

Display

Fllament

7 9 J4

4.70 to

6.05 VACrms

+VA

-VA

+5 Analog

+VDigital

+5 Memory

+5 Digital

10

12

11

11

14

13

15 13

16 13

18 17

+5X

24 23

-35

25 23

FIlament

27 28

Display Offset 27 26

J1

J1

J1

11

11

11

13

J3

J3

J3

+20.00 to

+28.00

-20.00 to

-28.00

+4.75 to

+5.25

+7.20 to

+12.10

+4.75 to

+5.25

+4.75 to

+5.25

+4.75 to

+5.25

-29.00 to

-37.20

-22.70 to

-31.50

VDC

VDC

VDC

VDC

VDC

VDC

VDC

VDC

4.70 to

6.05 VACnns

VDC

+.5X

19 20 J2 +4.75 to

+5.25 VDC

page

8



TESTING THE POWER SUPPLY UNLOADED

tenninals 18 and 17 or +5 Memory line between terminals 16 and 13) it is possible that a defective component on the Main Board is drawing the Power Supply down. In this case, you should test the

Power SuppIy unloaded before proceeding.

Incorrect power supply voltages

Tum the unit OFF Check the fuses.

Verify the the proper Line

Voltage is present Turn the unit ON.

INCORRECT POWER

SUPPLY VOLT AGES

~~An better nowJ

YES

Tum the unit OFF. Disconnect the Keyboard cable from the main board. Turn the unit ON.

NO

... ( Replace the

---IPl~

Keyboard/KPC)

(see

Section C). .

YES

Turn the unit

OFF.

Disconnect the cable between the power supply and the

Keypad/Display Board. Tmn the unit ON.

Replace the

(see

Section

B).

= = - - - - N O

YES

Tmn the unit

OFF.

Disconnect the cable between the power supply and the main board. Tmn the unit ON.

YES

Replace the Power Supply

Board (see

Section D).

==---NO---1~

Replace the Main

Board

(see

Section A).

Figure 5 -

Incorrect Power

Supply Voltages


9

Display Self-Test Mode

DISPLAY SELF·TEST MODE

When the KeypadlDisplay is receiving power from the Power Supply but is not in proper communication with the Main Board, the K.eypad/Display Board enters Self·test mode. In Selftest mode, the Display remains blank: until you press the buttons on the control panel. Pressing various control panel buttons will cause the Display to print characters, home the cursor, etc.

Using Self·test Mode to Diagnose the Keypad/Display Assembly

1. If the unit comes in with a blank display, but is in Self·test mode (i.e., the Display prints out characters when control panel buttons are pressed according to the chart below) this indicates the problem is either the Main Board or the communication link between the Main

Board, Keyboard assembly and the KeypadlDisplay Board Before replacing anything, check all connections, particularly the 20-pin cable to the Keyboard assembly.

If pressing buttons ca~ses only the leftmost character of the display to change, this usually indicates a defective cable connection (20-pin ribbon cable) between the Main Board and

Keyboard assembly or possibly a bad Keyboard assembly.

2.

If the unit is in Self·test mode but the display does not respond according to the chart below, the problem is most likely in the KeypadlDisplay Board If certain buttons do not function properly during normal EPS-16 PLUS operation, test them while the display is in

Self-test mode.

If you can't isolate a problem that seems related to the display, the display can be forced into Self-test mode using the follOwing procedure. With the power off, face the front of the unit, then:

Jumper the left (-) side of C19 (located below the MIDI Out jack) to pin 13 of U20 (WD 1772). On power up, the display will stay in Self-test as long as the jumper is connected, allowing you to check the Keypad/Display Board independently.

The Chart below details how the control panel buttons are mapped in Self-test mode:

Eri:ss:

LOAD

DiSula! Bi:ads:

8

COMMAND

EDIT

$

1.

INS1RUMENT

SEQ-SONG

3

SYSTEM:-M1DI

9

EFFECTS l/ENV 1

2/Er:..c"'V2

3/ENV3

+

0

1

6

4/PITCH

5lFILTER

61AMP

71LFO

8/WAVE

9/LAYER

O/I'RACK

UpArrow

7

<

=

(Home Cursor)

(Home Cursor)

*

3.

Pri:SS:

Down Arrow

Left Arrow

Right Arrow

DiSula! Ri:ads:

4.

.

/

? CANCEL-NO

EIDER-YES

Instrument-Track 1

Instrument-Track 2

Instrument-Track 3

Instrument-Track 4

Instrum.ent-Track 5

Instrument-Track 6

(Home Cursor)

Space

&

,

2

"

(Home Cursor)

Instrument-Track 7

Instrument-Track 8

5.

4

EFFEcr SELEcr-BYPASS 2.

SAMPLE

RECORD

STOP/CONTINUE

PLAY

>

o.

5

6.

pageJO EPS-J6 PLUS Service Manual

Troubleshooting Guide

TROUBLESHOOTING GUIDE

Often the faulty module in an EPS-16 PLUS can be determined through normal use. Sometimes, it is difficult to isolate the problem. The following flowcharts can help you diagnose units that appear dead (no display).

When troubleshooting an EPS-16 PLUS, always disconnect any expansion devices that may be present (such as the memory expander, SCSI Interface or

OEX~ will prevent a faulty expander from complicating your troubleshooting. The procedures for testing the

Memory Expander and the SCSI Interface are included with the corresponding expander. The procedure for testing the OEX-6 can be found on p. 19.

The following pages include troubleshooting flow charts:

~Problem

9 Incorrect Power Supply Voltages

12

13

14

15

Footswitch problems

EPS-16 PLUS with No LEDs Lit

EPS-16 PLUS with Some LEDs Lit

EPS-16 PLUS with

All

LEDs Lit, No Display

Troubleshooting an

EPS-16

PLUS with a Footswitch Problem (see Figure

6)

If one or both of the footswitches do not operate properly, make sure that the footswitches are set to the proper mode (on the Edit/System·MIDI page). See Section 2 of the EPS-16 PLUS

Musician's

Manual)

for more information. .

The SUSTAIN

Fr

SWITCH parameter corresponds to the right pedal of SW-5 or single pedal

SW-l. The AUX FT SWITCH parameter corresponds to the left pedal of SW-5 only. The SW-5 is the Dual Footswitch (piano-type) available from ENSONIQ. .

Footswitch

Default

SUSTAIN FT SWITCH

SW -1 single footswitch, or

. SW-5 right pedal

SUSTAIN

Option

Option right PATCH SL button

-

AUX FT SWITCH

SW -5 left pedal

OFF sequencer START/STOP left PATCH SEL button

If the footswitch mode is correct and the footswitch still doesn't function properly, there is either a problem with the Main Board, the

KeyboardIKPC or the 2O-pin ribbon cable connecting the two.

Although the footswitch jack is mounted on the Main Board, the footswitch signals

are

carried over to. the KeyboardIKPC by the 2()-pin ribbon cable, where they are sensed by the KeyboardIKPC mlcroprocessor.

EPS-16 PLUS

Service

Manual page 11


TROUBLESHOOTING AN EPS-16 PLUS

WITH A FOOTSWITCH PROBLEM

~-NO

YES

Set both footswitches to act as Patch Select Buttons.

Press

Edit

then

System-MIDI,

scroll to

SUSTAIN FI' SWITCH (right or single pedal) and press the

up arrow

button to set it to

PATCH SL.

Scroll right once to

AUX

Fr

SWITCH (left pedal) and set it to

PATCH SEL.

Select PIANO 241. Press

Edit,

then double-click on Instrument.

Pressing either footswitch should cause the appropriate patch indicator to change in the

·Iefunost two characters of the display.

~----YES---""

NO

Turn the unit

OFF. Attach the communications test board. Tum the unit ON and boot it up nonnally. The display will show'"

KBD

FAll...ED-TRY AGAIN? Press

Cancel·No.

... If your communications test board has an edge connector

(4090013601) this message will not appear.

Load in and then select PIANO 241.

Set both footswitch to act as Patch

Select Buttons (see above).

page

12

~--NO

Replace the

Main

Board

(see Section A).

YES

Replace Keyboard/KPC Simulator'

Board (see Section

C).

Figure 6 -

Footswitch Problem


NoLEDs lit.


TROUBLESHOOTING AN

EPS-16 PLUS WITH NO LEDS LIT

NO

YES

NO

YES YES

Check

KeyboardIKPC

20-pin ribbon cable for improper connnection ..

NO

i

Test the power supply

: unloaded. Go to Incmrect

Power Supply Voltages . flow chan, p. 9.

YES·

Replace the

KeypadlDisplay

Board (Section B).

Figure 7 -

NoLEDsLit

PLUS Manual page

13



WITH SOME LEDS LIT

>--NO

Test the power supply unloaded. Go to Incorrect

Power Supply Voltages flow chart on p.

9.

YES

>-_ _ Repaircable

JIll"" and retest.

YES

Place scope ground on the left lead (negative) of C19 and probe on pin

4 of J15-DISPLA Y.

page 14

YES

Replace the

KeypadlDisplay board

(see Section B).

>--NO

Replace the Main Board

(see Section A).

Figure 8 -

Some LEDs Lit

EPS-16 PLUS Service ManZllll

ALL LEDS LIT,

NO DISPLAY



WITH ALL LEDS LIT, NO DISPLAY

YES

Force the unit into self-test mode:

Jumper the negative (left) side of

C19 to pin 13 of U20.

Test the power supply

: > - - -

NO ...

--Ir.c

unloaded. Go to Incorrect

Power Supply Voltages flow chan, p. 9.

~--

...

NO

- - I r -

Replace the

KeypadlDisplay Board

(see Section B).

YES

Replace the Main

Board (see Section A).

YES

YES

Replace the Keyboard/KPC

Simulator board (see Section

C).

">---NO

.c

Repair and retest. )

Figure 9 -

All LEDs Lit, No Display

EPS-16

PLUS

Service Manual page

15

User Questions

MOST

COMMONLY

ASKED USER QUESTIONS

The following questions are the most commonly asked by end users. Our Customer Service

Representatives (CSRs) resolve these situations over the telephone daily.

Question:

CSR:

How do

I

Mix a Track or a Song?

Sequences (Tracks)

1) Set RECORD MODE to ADD

(see Section

8

o/the Musician's Manual)

2)

Select the Instrument-Track

3)

Press

Edit

then

Track,

scroll left to MIX

4)

Set mix to the desired value

5) Hold

Record

and press

Play

6) Let the Sequencer play one bar

7)

Press

Stop

8) Answer YES to KEEP=OLD - NEW

Question:

CSR:

Question:

CSR:

In Song Mode

1)

Chain sequences into a Song

2) Set RECORD MODE to ADD

3)

Select the Instrument-Track

4) Press

Edit

then

Track,

scroll left to MIX

5) Hold

Record

and press

Play

6) Mix Track through entire Song using the Data Entry Slider or the CV Pedal with PED=VOL

7) Answer YES to KEEP=OLD - NEW

The EPS-16 PLUS will not record a sequence from external sequencer in MUL 11 mode.

You must have O.S. version 1.1 or higher.

Why won't the EPS-16 PLUS let me edit converted Mirage sounds?

WS=1 contains the actual wavesample information for the Lower sound, WS=17 for the Upper.

All other wave samples

(30 of them) are copies of WS=1 or

WS=17. Therefore. isolate the desired wavesample(s) as follows:

1)

Create

a new Instrument

(see Section

3

o/the MusiCian's Manu.al)

2)

Create a new Layer in that Instrument

(see Section

7

o/the Musician's

Manuol)

3) Copy desired wavesample into the new Layer

(see Section 6o/the

Musician's Manual) .

4)

Truncate the new wavesample

(see Section

6


5) Edit as you wish

Question:

CSR:

Why do some other manufacturer's instruments crash when played from an

EPS-16 PLUS keyboard?

These instruments cannot handle the vast amount of MIDI data that Poly-Key generates. Turn the key pressure settings to CHAN or OFF on MIDI and each

INSTRUMENT, as follows:

1) Press

Edit,

then

System-MIDI (see Section

2


2) Scroll to BASECHANNEL PRESSURE=KEY

3)

4)

Change it to

CHANNEL or

OFF

Press

Edit,

then

Instrument (see Section

3


5) Scroll to PRESSURE MODE=KEY

6)

Change it to CHANNEL or

OFF

pageJ6


EPS-J6 PLUS Test Procedure

EPS-16 PLUS TEST PROCEDURE

The following procedure will ensure the thorough testing of the EPS-16 PLUS and also will aid in troubleshooting the unit To do the following tests you will need a M1DI cable, a Dual Footswitch

(model SW-5), and a Control Voltage Pedal (model CVP-l). The EPS-16 PLUS should be connected to a sound system in stereo.

If it is not known whether the KeypadlDisplay board is good, it can cause confusion in tracking down the problem.

If you do not have known-good correlation modules and suspect a

Keypad/Display problem, you should test this module fIrst (see Self-test Mode p. 10).

1.

Power

Up

(see Section 1 of the

EPS-J6 PLUS Musician's Manual for more information) a. Tmn unit on.

All the LEDs above the Instrument-Track buttons should light and the display should read ENSONIQ EPS-16 PLUS, then PLEASE INSERT DISK. b. Insen O.S. disk. The display should read LOADING SYSlEM. The EPS-l6 PLUS

(Keyboard unit only) will then display TUNING KBD - HANDS OFF. When the keyboard· is tuned, all

LEOs should go out.

2. Load in Sounds (see Section 1 of the EPS-16 PLUS Musician's Manual for more information) . a. Eject the O.S. disk. Insert the Test disk. b. Load bank IN-OUT BURN from the test disk (press

Load, Instrument, Ente,..Yes).

The display will say LOADING <filename> and the top yellow LED (redlorange on the

Rack) will blink while loading. c. The file is done loading when the display shows FILE LOADED and the top yellow LED

(redlorange on the Rack) stays on. The following sounds will be loaded into the

Instruments-Trackl through 6:

Instrument 1

Instrument 2

Instrument

3

Instrument 4

Instrument

5

Instrument

6

PIANO 241

PRESSURE

6-0UTlEST

20 VOX lEST

SAMPLEINST

3

BUS TEST

3. Keyboard Test (EPS-16 PLUS Keyboard Only) a. Select PRESSURE (lnstrument-Track2). b. Playa chromatic scale across the entire keyboard. Press each key down only until normal key travel ends. Do not press into pressure zone. Verify that no pressure effect occurs. c. Press the key into the pressure zone and verify that pressure causes a pitch bend. d. Using PRESSURE play all six

"c" keys and verify that the pitch rises 1 octave smoothly when the key is pressed down hard.

*

Failure indicates a Keyboard problem.

4. Disk Check a. Select PRESSURE (lnstrument-Track2). Save PRESSURE back to the disk.

Press

Command, and double-click on the Instrument button. The display shows SA VB

INSTRUMENT, press

Enter-Yes.

b. The display will show NAME= PRESSURE. Press

down arrow

to change the name to

ORES SURE. c. Press Ente,.. Yes. The display will say DELElE OlD VERSION? (except the fIrst time you save this sound). Press Ente,.. Yes to save ORESSURE (DISK COMMAND

COMPLETE will appear briefly when fInished). d. Eject the test disk and then press Load. Verify that the display shows DISK DRIVE NOT

READY.

EPS-J6 PLUS

Service Manual page 17

EPS-16 PLUS Test Procedure

e. Reinsen the test disk and then press

Load.

Verify that the display shows FILE 1 IN-OUT

BURN. f.

Eject the test disk and then reinsert the test disk and press

Load.

A file name should appear in the display.

If the message DISK DRIVE NOT

READY appears then FAn.. the unit. g. REPEAT step f5times.

*

If there is a failure, check the components in the following in order: 1) disk,

2) disk drive cables, 3) Disk Drive, and 4) Main Board.

S. Sound Check a. Select PIANO 241 (Instrument-Track1). Playa bit to check sound quality. Play up the keyboard to verify that PIANO 241 pans from left to right b.

Select 20 VOX JEST (Instrument-Track4). Press and hold down the three lowest white keys. Twenty notes will play in succession with the last note dropping an octave. Verify that there

are

no missing notes, distortion on a note, etc. c. Select

3

BUS TEST (Instrument-Track

6).

Press one key and you should hear

3 notes play in succession.

*

Failure indicates a main board problem.

6. Mono Output and Headphone Test a. Select PIANO 241 (Instrument-Track1). b.

Unplug the LEFTIMONO output cable and verify that both the high and low end of the keyboard

are

heard in the RIGHT output (there will be no output from the left). c. Plug in the Left cable and unplug the RIGIIT/MONO output cable and verify that both the high and low end of the keyboard are heard in the

LEFT output (there will be no output from the right). d. Plug headphonesdlrect1.y into headphone jack. e. Playa few notes to check for stereo and sound qUality. f. Reconnect the audio cables.

*

Failure indicates a Main Board problem.

7. MIDI Test (EPS-16 PLUS Keyboard Only) a. Select PRESSURE (Instrument-Track2). b. Connect

MIDI In

to

MIDI Out

with a MIDI cable. c. Hold down a few keys. d. Disconnect one end of the MIDI cable. e. When you release the keys, the notes should sustain. . f. Play twenty or more keys simultaneously to reinitialize the voices.

*


8. Footswitch Tests a. Plug the Dual Footswitch into the

Ft. Sw.

jack on the back of the

EPS-16

PLUS. b. Press

Edit,

the

System-MIDI

and scroll to

AUX

FT SWITCH

=

OFF. c. Press the

up arrow

button to change it to

AUX FT

SWITCH

=

START/STOP. d. Create a shon sequence by holding down

Record

and pressing

Play.

Use the sustain

(right) pedal to verify that sustain works, then stop the sequencer using the sequencer (left) pedal.

Press

Cancel-No.

*

If the footswitches do not operate correctly, see the Oowchart on p. 12.

page

18


EPS-J6 PLUS Test Procedure

9. Analog Test Page a. Plug Volume Pedal (model CVP-l) into the Pedal-CV jack. b. Go to the Analog Test Page (press

Command, Env

1, scroll right until EXAMINE

ANALOG INPUTS is displayed, then press

Ente,..Yes).

c. Examine the analog inputs using the following procedure:

Press the

Up Arrow

button to select the appropriate input, then press

Ente,.. Yes

to take a reading. Verify that the values are as follows:

1)

Controller

PITCH WHEEL

2) MODWHEEL

3)

VOL~(slideD

4) PEDAL (CV)

Down o o o o lI12

127

127

127

127

Center

64 unplugged

=

127

(Rack-always=O)

(Rack-always=O)

When testing the Data entry slider (Mr. Knob), you must scroll right so that the value is underlined. Press

Enter-Yes

to take readings.

5) MR. KNOB (data slider) 0 255

. Scroll left then up to test the Patch Select Buttons.

6) PATCH (select buttons) both up=<> right=32 left=64 both=127

*

Failure indicates a problem with the corresponding part, although it also could indicate a Power Supply failure or a Main Board problem.

If all readings are off, then it is most likely a problem with the Main Board.

10. Sampling Test a. Plug the microphone into the

Audio In.

b. Press

Sample,

the display shows LOAD OS DISK-mT EN1ER. c. Eject the test disk and insert the O.S. disk and then press

Ente,.. Yes.

d. The display shows PICK SAMPLE INST. Press Instrument-TrackS, then the

VU meter.

Enter-Yes

for e. Scroll right to INPUT LEVEL and set it to MIC, then scroll back to the VU meter .. f. Press

Ente,.. Yes

and sample by speaking into the microphone. You should hear what you are sampling at the Audio Output. g. Press

Cancel-No

to stop sampling. Play the sample and listen critically. h. Press the

Up Arrow

button once and play the sample in

BACKWARD, NO LOOP mode.

J.

Unplug the microphone from the

Audio In

jack.

*

Failure indicates a Main Board problem. For more information on

Sa~pling, see Section

5 of the EPS-16 PLUS

Musician's Manual.

11.0EX-6

When troubleshooting an EPS-16 PLUS with an OEX--6 that is not operating properly, you will need to determine whether the EPS-16 PLUS or the OEX--6 is at fault. Ifpossible. try the

OEX--6 with another EPS-16 PLUS. or try the problem EPS-16 PLUS with a different OEX-6.

The operation of the OEX--6 can be tested using the following procedure: a. Load and select the sound called

6-0UT

TEST. b. While playing the same note on the keyboard. listen to each OEX-6 output individually. You should hear a single square-wave tone in each output and the tone in each successive output should be a semitone higher in pitch than the previous output.

Note that the OEX--6 outputs

are

not designed to drive headphones directly and should be plugged into a suitable line-level pre-amp such as a mixing board.

*

If the EPS-16 PLUS itself

is

defective, the problem is in the Main Board.

EPS-16

PLUS


19

EPS-16 PLUS Test Procedure

12.

ESP

Effects Test 1 a. Eject the O.S. disk and insert the Test disk. b. Press

Load

then

Instrument.

Scroll to the Bank file FILE 2 FX TEST 1 and press

Enter-Yes.

Wait for all the instruments to load. The following sounds will be loaded into the Instruments·Trackl through

8:

Instrument 1

Instrument

2

Instrument

3

Instrument

4

Instrument

5

Instrument

6

Instrument

7

Instrument

8

PIANO

241

ROOM REVERB

~REVERB

HIFIREVERB

DUAL DELAYS

HIFIDELAYS

PHASER+REVRB

CHORUS+REVRB c.

Select each instrument one at a time and play it Listen for ESP effects problems, sound clarity, noise etc. Also watch for ESP download errors as an instrument is selected (either a

SYS1EM ERROR

### or the outputs playing dry instead of with effects).

*


13.

ESP

Effects Test 2 a. Press

Load

button then

Instrument.

Scroll to the Bank file FILE 3 FX TEST 2 and press

Enter-Yes.

Wait for all the instruments to load. The following sounds will be loaded into the Instrument·Trackl through 8:

Instrument

1

Instrument

2

Instrument

3

Instrument

4

Instrument

5

Instrument

6

Instrument

7

Instrument

8

PIANO

241

FLANGER+REV

CHOR+REV+DDL

ROT SPKR.+REV

CMP+DIST+REV

DIST +OIO+REV

WAH+DIST +REV

SPLASH1EST b. Select each instrument one at a time and play it Listen for ESP effects problems, sound clarity, noise etc. Also watch for ESP download errors as an instrument is selected.

Download errors will show up as either a SYSTEM ERROR ### or as the outputs playing dry instead of with effects.

*

Failure indicates .a Main Board problem.

page

20


EPS-16 PLUS

Burn-in Test

Program

BURN·IN TEST PROGRAM

To run the Bum-in Test Program, you must have the following items:

One EPS-16 PLUS Burn-in Test Disk

One MIDI Cable

One 1/4" Mono to 1/4" Mono cable

One 1/4" Stereo to 1/4" Stereo cable

The Bum-in Test Program is used at ENSONIQ to exercise the system hardware of a complete unit.

There are two test operations that the program can perform: 1) A continuous (bum-in) test of all components, and

2) a keypad integrity test.

The continuous operations test the Dynamic RAM, Disk Drive Read and Write, MIDI InIOut,

Keyboard, Sustain Footswitch, Aux Footswitch. Disk Drive Index Pulse, ESP RAM, ESP GPR

Registers, and E.SP Instruction Registers. The Disk Drive Read and Write tests are run approximately every ten minutes and take about five minutes to run. Failures of components can be automatically detected in all operations.

BURN·IN TEST

1.

Plug MIDI

Loop

Cable into

MIDI In

and

MIDI Out

jacks. Plug the Mono to Mono cable into the

Audio Out/Left

and

PedaZ-CV

jacks. Plug the Stereo to Stereo cable into the

Headphones

and

Ft. Sw.

jacks.

2.

Power up the unit and insert the BURN-IN TEST DISK VER.

X.x. making certain that the disk is not write-protected (i.e., the window must be closed).

3. Once the disk has been loaded, the display will read: DISK TEST COUNT XXX.

If no buttons

are

pressed the Bum-in Test cycle will begin automatically after twenty seconds.

NOTE: The ''Disk

Test Counter" is used to automatically monitor test disk usage and to indicate when a test disk becomes· unreliable. The "counter"is increased by one every time a DISK

WRITE test is done.

After about two weeks of continuous Bum-in Testing, the "counter" will reach its limit, and the disk will not boot the system properly. Instead, the display will read: DISK NO LONGER

USABLE. Contact ENSONIQ Customer Service fora replacement disk.

4.

Press

Enter-Yes.

The display will read:

DO

BUTTON TEST?

NOTE:

If you wish. press

Cancel-No

to by-pass the Button and Display tests and immediately begin the Bum-in Test cycle. The display will read: OK-HIT

ENTER

TO START. Go to

Step

9 to start the Bmo-in Test cycle.

S.

Press

Ente,.Yes.

All the special segments on the left·side of the display will light and the display will.read: LEFT SIDE ON-HIT ENTER.

6.

Press

Ente,. Yes.

All the special segments on the right side of the display will light and the display will read: RIGHT SIDE ON-HIT EN1ER.

7 •

Press

Enter-Yes.

All the LEDs will light and the display will read: LEDS ALL ON-IDT

ENTER.

S.

Press

Enter-Yes.

The display will read.: PRESS EVERY BU1TON. Press all the control panel buttons in any order. All the LEDs will flash as each button is pressed (don't forget to press the leight Instrument-Track buttons). Once all the buttons are pressed, the display will read:

OK-HIT

ENTER

TO START.

9. Press

Ente,.Yes

to start the Burn-in Test cycle. As the Bum-in Test runs, the display will indicate which of the tests is cmrently active. If the display will read. TESTING DYNAMIC RAM.


page 21

EPS-J6 PLUS Burn-in Test Program

BURN-IN FAILURE MODES

1. If there is a failure in any of the tests, the special segments in the display and the control panel

LEDs will flash alternately. The test cycle will continue.

2. To determine which test has failed, press

Cancel-No.

When the test that is currently being performed is finished the display will indicate a "PASS/FAIL STATUS" mode.

If the Dynamic

Ram has passed, for example, the display will read DYNAMIC RAM GOOD.

3 . Pressing any of the arrow keys will cause the program to page through and display the pass/fail status of each of the eleven tests. Once the failed test has been located, you can clear the pass/fail status mode by pressing

Cancel-No.

This should be done ONLY as a diagnostic function.

Once all failure status indicators have been cleared, press

Enter-Yes

to restart the Bum-in Test cycle at the displayed test

4. Pressing the

Edit

button will display the number of times the test has been performed and the number of times the test has failed. The format is shown below:

Test Iterations xxxxx

Test Failures xxxxx (xxxxx = 5 digit count value)

Failed Test

DYNAMIC RAM

DISK WRITE

DISK READ

N.lIDI IN/OUT

KEYBOARD

Problem in order of likelihood

Main Board

Test Disk, Disk Drive cable, Disk Drive, Main Board

Test Disk, Disk Drive cable, Disk Drive, Main Board

Check cable continuity and cable insertion, Main Board

Keyboard cable, Keyboard

SUSTAIN FOOTSWITCH Check cable continuity and cable insertion, Main Board, Keyboard

AUX FOOTSWITCH Check cable continuity and cable insertion, Main Board, Keyboard

INDEX PULSE (Disk Drive) Disk Drive cable, Disk Drive, Main Board

ESP RAM

Main

Board

ESP GPR REGISTERS

Main

Board

ESP INSTR REGISTERS Main Board

page

22


Hardware Notes

HARDWARE NOTES

EPS-16 PLUS KEYBOARD AND RACK

FLASHBANK Format Errors

On

Rev C and lower Main boards ONLY (4001013501 with Rev letter is located next to the

MIDI

Thru jack) a trace cut must be made in order for the unit to work properly with a

FLASHBANK option (see Figure

10).

If this trace is not cut all the way through, you may get a

FLASH FORMAT ERROR message when formatting a FLASHBANK.

DO NOT CUT THIS TRACE

ON REV D (or hi"gher) BOARDS

31

Pin

38

:> make sure the trace to this feedthru is cut.

81

On 40010013501 board of"

Rev A, B, or C, make sure that this trace is cut. This trace does not need to be cut on Rev D or higher boards.

CUT ...............

'-Lo

Main Board Edge

Figure 10 -Trace cut for Rev A, B, or C Main Boards

For best results, be sure that the EPROMs are version 1.ooF or higher. For more information, see Keyboard and Rack Similarities on p. 1.

EPS-16 PLUS KEYBOARD ONLY

1. OEX-6CAUTION!!! Th1PORTANT!!!

The 8-pin mini-DIN connector on the rear panel of the EPS-16 PLUS should only be used to connect the OEX-6 Output Expander to the unit. This connector does not simply supply audio outputs and signal ground and, therefore, cannot be used to generate separate outputs without the"

OEX-6. The EPS-16 PLUS generates digital signals which must be convened externally. The signals present on this connector include digital control signals and +/15VDC. Improper connections to these signals could easily damage the

EPS-16 PLUS or any external device connected. The OEX-6 should never be plugged in or unplugged with the EPS-16 PLUS power on, as this could damage the EPS-16 PLUS.

2. Keyboards that think that they are a Rack

The O.S. disk and EPROMs are the same for both the EPS-16 PLUS keyboard and rack. With

O.S.

disk Version 1.00, the software determined whether the unit was a keyboard or a rack by the value/position of the pitchwheel. If the pitchwheel was off center, the unit would not go through the keyboard calibration routine and would act just like a rack. To fix this, update the unit to the latest software (EPROMs and disk).


page

23

Hardware Notes

EPS-16 PLUS RACK ONLY

1. Dim Displays or Extra Segments

(SIN

10000 to 10244)

On early EPS-16 PLUS Racks, there is a potential for the Display to shon out to the front panel.

This can cause extra segments of the display to light or the whole display may appear dim. To fIx this problem, remove the keypad/display board from the front panel. Place insulating tape along the flat inside edge of the front panel (both top and bottom). Reinstall the KeypadlDisplay.

2. Panasonic

m-257

Disk Drive

On early EPS-16 PLUS Racks that have a Panasonic JU-257 disk drive, there is a potential for a short between the disk drive mounting bracket and the case of the disk drive that may cause audio noise during a floppy disk access. There are two ways to fix this problem:

• Place insulatiDg tape on the sides of the drive to isolate the it from the mounting bracket,

or

• Carefully remove (desolder) the surface-mounted resistor labeled RI30 from the disk drive

PCB. With the bezel closest to you (pCB side up), R130 is located

on

the right side of the

PCB next to the PCB mounting screw.

3.

Main Board

PEM

(threaded mounting standoff)

On some early units, one main board screw was left out due to the misplacement of a Main Board mounting

PEM.H

there is no screw in this location (see Figure 11), don't insert one.

M emory

Expander.", cr-

0

Board

0 0 0

-0

When installing a

REV A into a Rack, be sure that the mark in this

REV A comer is disconnected from the trace next to it.

SCSI board o

4. Leave these two mounting screws out when:

• it is a REV A Memory

Expander board, and

• no

SCSI bom:l is installed. o

0 0 o

Main Board o

0

Figure

11 -

Hardware Notes for the Rack only

3.

If this Main Board hole doesn't line up with its mounting PEM, leave the screw out.

4. ME-I6

PLUS

Memory

Expander Board

On some

REV A boards, one of the mounting screws could connect a +5V trace to the grounded chassis

(see

Figure 11).

On power up, the unit would show LOADING SYS1EM but get no further. Leave these two screws out when a REV A memory expander board is used and when no SCSI board is installed (no screw head will touch the trace when a SCSI board is installed).

5.

SCSI Board

On some REV A SCSI boards, a mounting screw could connect a +5V trace to the grounded chassis (see Figure 11). Use a razor knife to disconnect the bottom left corner of the "R" in REV

A from. thettace next to it.

page

24


Software Notes

Error Messages

Occasional error messages are not unusual, and unless they become chronic, they are not a cause for concern. It is important to realize that these messages are diagnostics and do not necessarily indicate a problem. These messages were designed to help our software engineers in the development of the software, not as hardware diagnostics.

The following error messages could be caused by software:

ID

~

16

Description ID

#

Description poly or mono pressure events sent to VC 133 trapv instruction overllow error

20 unknown button event 134 privilege violation

48

49

80

128

129

130

131

132 parameter error layer

error

bad buffer bus error odd to

MIDI address error divide by zero illegal instruction chk instruction register out of bounds

135

137

138

139

192 trace line 1111 emulator spurious interrupt unused vector load all data error (from :MIDI

193 keyup playback error

194 out of SOBs error or card)

Main Board Problems

The following unexpected event messages could be caused by a problem on the Main Board:

32

33

34 bad download bad ESP chip bad ESP RAM

40 bad ESP error

138 spurious interrupt

145 unknown OUART interrupt error

MIDI 'or Main Board Problems

The following unexpected event message is usually caused by too much incoming MIDI data.

It also could be caused by a problem with the keyboard:

144 out of buffers

SOFTWARE NOTES

To Check the Software Version from the front panel:

• Press

Command, Envl.

The display shows NO COMMANDS ON PAGE.

• Repeatedly press the

left

or right

arrow

button until·the display shows SOFfW ARE

INFORMATION.

• Press

Enter-Yes.

The display shows RAM VERSION

=

X.XX, press

Enter-Yes,

the display shows ROM VERSION = Y.YY, press

Enter-Yes,

VERSION = XXX (for the Rack, this will always read 1). the display shows KEYBOARD

BOOTUP ROM CHANGES

The foHowing change was included in

ROM Version l.00B (Keyboard only,

SIN 10460):

Enended

Ithe acceptable range of Mod wheel and other analog inputs.

The following change was included in ROM Version

1.00c

(Keyboard only,

SIN 11646):

This veaion ·ofROMsupports loading the operating system from

FLASHBANK.

The following change was included in ROM Version l.00D (Keyboard

SIN 12440):

This version of ROM fixes a problem when the FLASH memory is completely filled (0 blocks free). All EPS-16

PLUS Racks have at least this version.

The following change was included in ROM Version l.OOE:

(Keyboard SIN 12471. Rack

SIN 10290)

A change was made to allow the CV pedal value on the Analog Test page go full range (0-127).

EPS-J6 PLUS Service Manual page2S

Software Notes

The following change was included in ROM Version l.00F:

(Keyboard SIN 13871, Rack

SIN

10738)

A bug was fixed that caused a DISK TYPE ERROR when saving instruments to FLASHBANK.

The following changes were included in O.S. DISK VERSION 1.10:

In version 1.10, the MULTI-TRACK RECORD feature, which was omitted from version 1.00. has been implemented.

In addition. there are two additional refmements added as ofv 1.10 to make the software a little more user-friendly:

• When you go into Record after loading or deleting instruments (a condition that requires the EPS-16 PLUS to shuffle memory for a second or two) the display will show SHUFFLING DATA, until the click starts and it is ready to record. Previously there was no visual feedback during this time, causing users to wonder what was going on;

• When the sequencer is synced to MIDI

(CLOCK.

SOURCE=MIDI on the EDIT/Seq·Song page) and you press record, the display shows WAITING ... to indicate that the unit is waiting for a MIDI Start and clocks before going into

Record.

If the sequencer is synced to MIDI and it needs to shuffle memory before going into record, it will show

SHUFFLING DATA for as long as necessary, then go to WAITING... Always wait until the display shows waiting before starti:ng the sending device.

The following is a summary of changes which were included in version 1.10:

HANGING NOTES

• It was possible to make notes hang while playing DIST GUITAR sound (related to layer delay).

PITCH WHEEL

• Pitch wheel reading drifted as the unit warmed up.

MIDI

• If TRANSMIT ON=INST CHAN, it didn't send proper values for key pressure out MIDI.

• Sustain pedals from

MIDI were not recorded properly by the sequencer.

LOADING AND SAVING

• When you loaded an Instrument into a copy of an already loaded instrument, it sometimes crashed, displaying

ERROR 129.

• The EPS-16 PLUS did not handle errors properly when saving multi-disk fIles, particularly when resaving an existing one. Sometimes it created two

Disk

1 's and a Disk

2 for a 3-disk sound.

• When a bank should have been loading sounds from hard disk, the unit seemed to ask for a floppy. then displayed

WRONG DISK INSERTED when you inserted the floppy, because it was really looking at the hard disk but with the wrong disk label.

• When an EPS (classic) bank was loaded. the track PAN values were ttanslated incorrectly in the presets.

SEQUENCER

• It was possible to edit track parameters when no Instrument was loaded.

• Click pan defaulted to

+3; it should default to

0 (center).

• On CHORUS + REVERB algorithm, click assigned to

BUS3 still came out left channel when BUS3=OFF.

• Click assigned to

BUS3 periodically snuck into BUS1, creating a reverb splash, especially with

44KHZ effects.

• Overdub

Standby state was not cleared when an

1Dllooped sequence stopped.

EFFECTS

• Effects could howl when loading a bank with a playback rate different from the existing one.

• On 44KHZ REVERB algorithm,

Denme

Rate and Amt parameters were interconnected, changing either one changed the other. .

SAMPLING

• Entering and exiting sampling while holding keys and sustain pedal could confuse the unit, causing sustain pedal to hang. or be ignored. or worse.

page

26

EPS-J6 PLUS Service Ma1UJ1l1

EPS-16 PLUS KEYBOARD ONLY

EPS·16 PLUS KEYBOARD

ONLY SECTION


Contents:

page

Figure

12 16

PLUS Keyboard ExPloded View 28

Replacing Modules

A Main Board . . . . . . .

B -

Keypad/Display Board. . .

Figure

13

EPS-16 PLUS Button Colors

C -

Keyboard. . . . .

Figure

14

Bottom ojCase

. . . . .

D Power Supply Board . . .

E Transformer. . . . . . .

F Pitch/Mod Wheel Assembly .

G -

Line

Filter. . . . . . . .

H -

DiskDrive

. . . . . . .

29

29

30

30

31

31

32

32

33

33

fl,lge 27

I

I t

I f

-_-7---,SliderKnObS

I

----

..

I

-------i

I

1~==-_

\

--..~

-~

~--~

~

--=-~

page 28

Power Supply

Board

Figure 12 -

EPS-16 PLUS Keyboard Exploded View


)

Replacing EPS-16 PLUS Modules (KEYBOARD ONLY)

Removing

Installing

Replacing the Main Board

1. Remove all cables connected to the EPS-16 PLUS, including the Power cord.

2. Remove the four (4) screws that fasten the control panel with a 2.5mm hex wrench and raise the control panel.

NOTE:

These

are

machine screws.

3.

Remove the Keyboard (see Section

C).

Note that you should remove the 20-pin ribbon cable from the Main Board (at J12) instead of from the Keyboard.

4.

Disconnect all cables from the Main Board: a. Push-on ground wire (located between the :MIDI Thru and MIDI Out jacks) b. J4-DISK, 34-pin ribbon cable . c. HI-POWER, 9-wire cable d. J13-WHEELS, e. J15-DISPLA Y, f. J2-NON-VOLATTI...E :MEMORY and/or J3-AUXEXPANSION (if present)

5. Remove the six (6) 15mm nuts from the rear panel jacks marked

Ft. Sw.,

PedaleCV, Left/Mono, Right/Mono, Audio In

and

Phones.

6.

Remove the eight (8) self-tapping screws and one ground machine screw with star washer that attach the Main Board to the case and remove the board

7. With the board tilted on a slight angle, insert the jacks into the holes in the rear panel. Press the board down and into place.

8. Replace the Main Board screws and secure the jacks with the nuts.

9. Reconnect the cables. Reinstall the Keyboard (see Section C).

10. Power up, test the unit, and close the control panel.

SECTION

B

Replacing the Keypad/Display Board

Removing

1.

Remove all cables connected to the EPS-16 PLUS, Including the Power cord.

2. Remove the Volume and the Data Entry knobs. Remove the four (4) screws that fasten the control panel with a

2.5mm hex wrench and raise the panel

NOTE:

These are machine .screws.

3.

Remove the six-wire cable from the left side and seven-wire cable from the right side of the Keypad/Display board.

Note

that these cables

are

keyed.

IMPORT ANT! The individual colored buttons

are

held in place only by the Keypad/Display board underlay. Make sure the control panel is open all the way to prevent the buttons from falling out when the board is removed If they do fall out, see

Figure 13 for button color placement.

Installing

4.. Remove the fomteen (14) screws that hold the KeypadlDisplay in place and carefully remove the Keypad/Display. Remove the cardboard insulator that covers the bottom of the Keypad/Display board.

5.

To reassemble, first make sure that the underlay and all the buttons are in place and that the lens is clean and in its proper position.

6.

Install the new KeypadlDisplay board with the cardboard insulator using the fourteen (14) screws. Reconnect the two cables paying particular attention to the polarity. Reinstall the knobs on the Data Entry and Volume sliders.



29

Replacing EPS-J6 PLUS Modules (KEYBOARD ONLY)

Load

-

Edit

-

Command

Etn.ment

ling

-

. .

Volume

=

Mode==Page

IBlack I

IBlack I

1 2 3

7

4 5 6

•••

8

II

~

IBlack I

A

1

-

..

MIDI . . . . .

0

III

No

Cancel

- -

~

Y/iIS

EnIer

Data

Entry======

=;;;E~~ue~ncer=

Continue

. Figure 13

-EPS-16 PLUS Button Colors Dark Grey]

Replacing the Keyboard

Removing

Installing

1. Remove all cables connected to the

EPS-16 PLUS, including the Power cord.

2. Remove the four (4) screws that secure the control panel with a 2.5mm hex wrench.

NOTE:

These are machine screws.

3.

Place the unit upside down on a soft surface and remove the ten (10) screws that attach the Keyboard to the·case.

See

Figure 14 for location of screws.

4.

Carefully turn the unit right side up. Raise the control panel and disconnect the

Keyboard Ribbon cable (12) from the Main Board, paying particular attention to the polarity.

5.

Remove the Keyboard from the case by gently lifting up the front of it while pulling it toward the front of the unit

Once the

rear

of the Keyboard has cleared the control panel mounting tabs, the Keyboard can be removed from the

Keyboard cavity (see pp. 1-2.). .

6. While paying particular attention to polarity, remove the Keyboard Ribbon cable from the old Keyboard and install it on the new Keyboard.

7. Connect the Keyboard Ribbon cable to the Main Board. Be sure that the cable lies flat beneath the Keyboard and is not pinched under the Keyboard frame.

IMPORT ANT! If the ribbon cable is mispinned, fuses F3 and F4 on the power supply will blow.

8.

Insert the new Keyboard rear first into the unit at the front of the

Keyboard cavity. Gently slide the Keyboard toward the rear of the unit, lowering the front of the Keyboard as needed to clear the control panel mounting tabs.

IMPORT ANT! Make sure the Disk Drive ribbon cable is not caught under the Keyboard standoffs.

9. Turn the unit upside down on a soft surface and replace the ten (10) screws that secure the Keyboard to the case.


page 30 EPS-J6 PLUS Service Manual


• Front of Case (Keyboard Side) •

0 0 0 0

0)

0

•

•

• •

•

•

Wheel

Keyboard

Assembl

Screws

Screws

• o

0 o

0

•

~D

• •

I

1111111 U 11111

•

Figure

14

-Bottom of Case

0 o

• •

~(g

•

(c)

I

SECTION

D

Replacing the Power Supply Board

Removing 1. Remove all cables connected to the EPS-16 PLUS, including the Power cord.

2. Remove the four (4) screws that fasten the control panel with a 2.5mm hex wrench. NOTE: These are machine screws.

3. Disconnect the 9-pin connectors (II, J4), the 6-pin connector (13), and the 4-pin connector (J2) from the Power Supply Board. Note that these connectors are keyed.

IMPORT ANT! The connector on the 9-pin cable from the transformer has a high retention force.

Please use a scribe, screwdriver, or similar tool to remove it (see p. 4).

Do

not pull on the wires!

Installing

4. Remove the screw and star washer that connect the ground wire to the heatsink.

5.

Remove the two (2) screws and nuts that secure the Power Supply to the case

(note that there are star washers on each screw).

6 .. Remove the Power Supply board by pulling the front of the board toward the

7.

Keyboard and then lifting it up so that the finned heat sink clears the case.

Insert

the replacement Power Supply Board into the case finned heat sink first.

Lift the tinned heat sink from the outside of the case so that it is centered in the opening. The standoffs are intended only for support and should not be stuck down to the case.

8. Reinstall the Power Supply screws and star washers and be sure to connect the ground wire to the heat sink. Carefully reconnect the four cables, paying particular attention to the alignment of pins and connectors.

9.· Power up, test the unit, and close the control panel.

EPS-J6 PLUS Service Manual page3J

Replacing EPS-16 PLUS Modules (KEYBOARD ONLY)

Replacing the Transformer

Due to problems that may occur with the plastic case, all units that need the

Transformer replaced should be sent back to the factory. Contact your distributor if you are located outside the U.S.

SECTION

F

Replacing the Pitch/Mod Wheel Assembly

The Pitch and

Mod

Wheels are replaced as an assembly along with the main harness cables.

Removing

Installing


2.

3 .

Remove the four (4) screws that fasten the control panel with a 2.5mm hex wrench. NOTE: These

are

machine screws.

Place the unit upside down on a soft surface and remove the four·

(4) screws that attach the Wheel Assembly to the case. See Figure 14 for location of screws.

4. Return the unit to an upright position. Raise the control panel and cut the wire ties that hold the wire harness to the chassis. .

5.

Disconnect the main harness from the Main Board, the Power Supply, the

Keypad/Display and the line filter.

Note

that these connectors

are

keyed and have connector locks.

6. Carefully lift the Wheel Assembly out of the case.

7. Disconnect the cables from the Disk Drive, paying particular attention to the polarity.

8. Remove the Disk Drive and place it into the new assembly as described in Section

H Reattach the

Disk

Drive cables.

9. Connect the new wire harness to: a. the Main Board (Ill, J13, J15, and ground lug), b. the Power Supply (J1,J2, J3, and ground wire to the heat sink), c. the KeypadlDisplay (left sides), and d. the line filter ground lug paying particular attention to the alignment of pins and connectors.

10. Reconnect the wire harness to the case using wire ties.

11. Reattach the Wheel Assembly to the case using the four screws.


page

32



SECTION

G

Replacing the Line Filter

Removing 1. Remove all cables connected to the EPS-16 PLUS, including the Power cord.

2. Remove the four (4) screws that fasten the control panel with a 2.5mm hex

3. wrench. NOTE: These are machine screws.

Remove the three (3) wires connected to the back of the Filter, paying particular attention to the polarity.

4.

Remove the two

(2) screws and nuts that secure the Filter to the case. Note that there

are

star washers on the inside only.

Installing 5. Install the new Line Filter from outside the case using the two screws, star washers and nuts.

6. Reconnect the three wires to the Filter, again noting the proper polarity.

IMPO RT ANT! Failure to connect the wires to their proper posts can lead to a potential shock hazard

(see Figure

3).


SECTION

H

Removing

Installing

Replacing the Disk Drive


2. Remove the four (4) screws that fasten the control panel with a 2.5mm hex wrench. NOTE: These are machine .screws. .

3. Turn the unit over,

top

down, and remove the four (4) screws that attach the

Wheel assembly to the case. See Figure 14 for location of screws. Return the

4. unit to an upright position and raise the control panel. Carefully lift the wheel assembly out of the case.

Disconnect the two cables from the Disk Drive, paying particular attention to the polarity (see p. 2, the Disk Drive).

5.

Remove the four

(4) screws and star washers that attach the Disk Drive to the wheel assembly.

6. Carefully slide the Disk Drive out of the wheel assembly.

7. !mIDPJ.iiately place the defective drive in the anti-static bag that the new drive came m.

8. Slide the new Disk Drive into place and mount it using the four screws and star washers. Reconnect the two cables, paying particular attention to the alignment of pins and connectors.

9. Reattach the wheel assembly to the case using the four

screws.



33


NOTES:

page

34


EPS-16 PLUS RACK ONLY

EPS·16 PLUS RACK

ONLY SECTION


Contents:

Figure

14

PLUS Rack Exploded View

Replacing Modules

A Rack Main Board . . . . .

B -

Rack Keypad/Display Board

C -

Rack KPC Simulator Board .

D -

Rack Power Supply Board

E -

Rack Transformer

. . . .

F -

Rack OEX-6 Board . . . .

G -

Rack Line Filter

. . . . .

H Rack Disk Drive . . . . .

J -

Rack Memory Expander Board page

36

37

38

39

39

40

40

41

41

42

page

35

-...

Memory

Expander

Board

page

36

Simulator Board

Power Supply Be

~--

--c~_

Disk Drive Mounting Bracket

Figure

16 -

EPS-16 PLUS Rack Exploded View

EPS-16 PLUS

Service

Manual

Replacing

EPS-J6 PLUS

Modules

(RACK ONLY)

SECTION

A

Removing

Installing

Replacing the Rack Main Board

1. Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.

2. Remove the lid (see below). Remove the OEX-6 board (see

Section F steps 3-6).

3. Remove the five (5) 15mm nuts from the rear panel jacks marked Audio In,

Right/Mono, Left/Mono, Pedal-CV,

and Ft. Sw.

4.

Disconnect all cables from the

Main

Board.

5. Remove the ten (10) machine screws (and one star washer from the ground pad) from the Main Board (one screw is located in the middle of the board between

VR6 and C68). See Rack Hardware Notes items #3 and 4 on p. 24.

6.

Before installing the new circuit board, make sure the mylar insulator is in place.

7. With the board tilted on a slight angle, insert the jacks into the holes in the rear panel. Press the board down and into place.

8. Replace the Main Board screws, and secure the jacks with the nuts. Reconnect the ,cables.

9. Reinstall the OEX-6 board (see Section F) and secure the jacks with the nuts.

10. Power up, test the unit, and reattach the lid (see below).

Removing

REMOVING THE LID

Remove the twenty-two (22) screws that fasten the cover:

1. Remove the one (1) 6-32 machine screw from above the disk drive (about an inch back from the front panel) that attaches .the cover to the disk drive bracket,

2. Remove the four (4) #8-32 machine screws and star washers from

each

side panels of the unit (the ones that could attach the mounting ears).

3. Remove the four (4) 416 x 1/4" self-tapping screws that attach the lid to the front panel.

4. Remove the nine (9) #5 x 1/4" self-tapping screws that attach the lid to the base: a. remove two (2) screws from

each

side of the unit, and b. remove five (5) from the back of the unit Note that the center screw has a star washer.

5. Carefully remove the lid from the unit.

REATTACHING THE LID

IMPORTANT! Be :sure to install all screws into the Control Panel with a hand

:screw driver to avoid stripping the holes (see p. 4).

Installing 1. Install the five (5) self-tapping screws on the back of the unit Make sure that there is a star washer on the center screw.

2. Install the two (2) self tapping screws on either side of the unit

3. Install the one (1) machine screw on the top of the unit located about 1" back from the control panel.

4. Install the four (4) self-tapping screws on the top of the unit closest to the control panel.

5. Install the four (4) machine screws and star washers into each side of the unit (the ones that could attach the mounting ears).

EPS-J6 PWS


37

Replacing EPS-J6 PLUS Modules (RACK ONLY)

SECTION

B

Replacing the Rack Keypad/Display Board

Removing 1.

Installing

2.

3.

4.

5.

6.

7.

8.

9.

Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.

Remove the lid (see Section

A).

Remove the two cables from the disk drive, three cables from the keypad/display board, two wires to the power switch, and unplug the headphones cable from the main board.

Carefully tip the unit onto its rearpanel. Remove the four (4) self-tapping screws and ,one star washer from the bottom of the unit closest to the control panel.

Remove the one (1) machine screw from the bottom of the unit located about I" back from the control panel (this screw goes through the disk drive mounting bracket inside the unit).

Carefully remove the Control Panel from the unit Just enough to unplug the 20pin ribbon cable from the KPC simulator board.

Place the Control Panel face down on a soft surface. Remove the eleven (11) screws that attach the KeypadlDisplay Board to the control panel.

See Hardware Notes p. 24.

Install the new KeypadlDisplay board onto the new control panel using the eleven screws.

Reconnect the 20-pin ribbon cable to the KPC simulator board before sliding the new assembly into place (make sure the striped side of the ribbon cable is on pin

1).

IMPORTANT! Reconnect the 20-pin ribbon cable to theKPC simulator board before sliding the new assembly into place. Be sure to install all screws into the Control Panel with a hand screwdriver to avoid stripping the holes (see p. 4).

10. Install the four (4) self-tapping screws (one with a star washer) on the bottom of the unit closest to the control panel.

11. Install the one (1) machine screw from the bottom of the unit located about 1" back from the control panel (this screw goes through the

disk

drive mounting bracket inside the unit).

12. Connect the two cables to the disk drive, three cables to the keypad/display, two wires to the power switch (see Figure 2), and plug the headphones cable into the main board paying particular attention to polarity.

13. Power up, test the unit, and reattach the lid (see Section A).

page

38



SECTION

C

Removing

Installing

Replacing the Rack KPC Simulator Board

l.

2.

3.


Remove the lid (see Section A).

4.

5.

Remove the control panel (see Section B) OR remove the transfonner (see Section

E).

Disconnect the 20-pin ribbon cable from the

KPC simulator board.

Pop. the KPC simulator board from the four white standoffs by squeezing the

6.

7.

8.

9.

standoffs.

Install the new

KPC simulator board onto the standoffs making sure the side of the board with the 2O-pin connector is closest to the base of the unit.

Connect the 20-pin ribbon cable making sure that the striped side is on pin 1.

Reinstall the control panel (see Section B) OR the transfonner (see Section E).

Power up, test the unit, and reattach the lid (see Section A).

SECTION

D

Removing

Replacing the Rack Power Supply

Board

1. Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.

2. Remove the lid (see Section A).

3. Disconnect the 9-pin cables (Jl, J4), the 6-pin cable (13), and the 4-pin cable (J2)

. from the Power Supply Board. Note that these cables are keyed.

IMPORT

ANT! The connector on the 9-pin cable from the transfonner has a high retention force.

Please use a scribe, screwdriver, or similar tool to remove it (see p. 4). Do not pull on the wires!

Installing

4. Carefully tip the unit onto its rear paneL While holding onto the Power Supply board with one hand., remove the three screws from the bottom that attach it to the base.

S. Remove the Power Supply board.

6. Insert the replacement Power Supply Board.

7. Reinstall the Power Supply screws. Carefully reconnect the four cables, paying particular attention to the alignment of pins and connectors.



39

Replacing EPS-16 PLUS Modules (RACK ONLY)

SECTION

E

Replacing the Rack Transformer

Removing 1.

Installing

2.

3.

4.

5.

6.

7.

Remove all cables connected to the EPS-16 PLUS Rack, including the power cord. .

Remove the lid (see Section A).

Disconnect the transformer cables to the power supply, line filter, and power switch.

Remove the four screws and flat washers that hold the Transfonner in place.

Insert the new Transformer and attach it to the base using the four screws and flat washers.

Reattach the cables to the power supply, line filter, and power switch.

Power up, test the unit, and reattach the lid (see Section A).

SECTION

F

Replacing the

Rack OEX-6 Board

Removing 1. Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.


3. Disconnect the ribbon cable from the OEX-6 board.

4. Remove the six (6) 15mmnutsfrom the rear panel jacks marked

Bus3lRight,

Bus3ILejt, Bus2lRight, Bus21Left, AuxllRight, andAuxllLeft.

5. Pop the OEX-6 board from the two white standoffs by squeezing the standoffs.

Installing

6. Remove the OEX-6 board from the unit.

7. With the new OEX -6 board tilted on a slight angle, insert the jacks into the holes in the rear panel and snap the board onto the standoffs.

8. Reconnect the ribbon cable from the main board making sure that the striped side is on pin

1.

9. Secure the jacks with the nuts.

10. Power up, test the unit, and reattach the lid

(see Section A).

page 40 EPS-J6 PLUS Service Manual

Replacing EPS-16 PLUS Modules (RACK ONLY)

SECTION

G

Replacing the Rack Line Filter

Removing 1. Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.


3. Remove the three (3) wires connected. to the back of the Filter, paying particular

Installing attention to the polarity.

4. Remove the two (2) screws and nuts that

secure

the Filter to the case. Note that there are star washers on both sides.

5.

Install the new Line Filter from the inside of the base using the screws, star washers and nuts.

6. Reconnect the three wires to the Filter, again noting the proper polarity.

IMPORTANT!

Failure to connect the wires to their proper posts can lead to a potential shock hazard (see

Figure 3).

7. Power up, test the unit, and reattach the lid (see Section A) .

. SECTION

H

Removing 1.

2.

3.

4.

5.

6.

7.


Remove the lid (see Section A). Remove the control panel (see Section B).

Disconnect the two cables from the Disk Drive, paying particular attention to the polarity (see p.

2, the Disk Drive).

Remove the four (4) screws that attach the Disk Drive mounting brackets to the control panel.

Remove the four (4) screws that attach the mounting brackets to the Disk Drive.

Immediately place the defective drive into the anti-static bag that the new drive came in. .

Attach the mounting brackets to the new Disk Drive using the four screws. lDstalling

Replacing the Rack Disk Drive

IMPORTANT!

Be sure to install all screws into the Control Panel with a hand screw driver to avoid stripping. the holes (see p. 4).

8. Attach the mounting brackets to the control panel trying to use the same holes.

9. Attach the control panel to the base (see Section B).

10. Connect the two cables, paying particular attention to the alignment of pins and connectors.


EPS-16 PLUS Senlice Manual page

41


SECTION

J

Replacing the Rack Memory Expander Board

Removing·· 1. Remove all cables connected to the EPS-16 PLUS Rack, including the power cord.

2. Remove the lid (see Section A). Remove the control panel (see Section B).

3. With the front panel close to you, the memory expander board is located in the left corner of the unit.

4. Remove the screws that attach the memory expander to the base. If the memory expander board is a REV A, there should only be two screws holding it in. If the memory expander is a REV B or higher, there should be four screws holding it in place. See Rack Hardware Notes item #4 on p. 24.

Installing

5. Wiggle the memory expander board side to side and up a bit to remove it.

6. Before installing the replacement board, make sure that the connector fingers are clean.

If needed, clean them using a pencil eraser.

7. Insert the board fingers into the main board connector.

.

8. Attach the board to the chassis using the correct number and placement of screws.

See Rack Hardware Notes item #4 on p. 24.


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