Kurzweil K250 User manual

·----.......-

,.,

...

Kurzweil250

SERVICE MANUAL

(K250, K250X

and

RMX

Models)

Kurzweil Music Systems, Inc.

411

Waverley Oaks Road

Waltham, MA 02154

(617) 893-5900

January, 1989

Document No.: 92000201

~--

CHAPTER

CHAPTERS

CHAPTER

Table of Contents

INTRODUCTION

PRODUCT

HISTORY

SYSTEM

OVERVIEW

DIAGNOSTICS

DISASSEMBL

Y/ASSEMBL

PROCEDURES

PARTS

LISTS

SCHEMATICS,

LAYOUTS,

WIRING

DIAGRAMS

KURZWEIL

MUSIC

SYSTEMS,

INC.

411

WAVERLY

OAKS

ROAD

WALTHAM,

021S4

DOCUMENT

PART

NO.

92000201

January,

1989

Kurzweil Music Systems,

Inc.

The information contained herein

confidential and proprietary

Kurzweil Music

Systems, Inc. It

disclosed

you

solely for purposes of instruction

operation of

the

equipment

and

maintenpnce

appropriate. It

not

used

you

for any other

purpose, nor is it to

disclosed

others without the express permission of Kurzweil

Music Systems, Inc.

Kurzwell 250 Service Manual

•..

_---

----

Chapter 1 - Introduction

1.1

Product Description

1.2 Specifications

.2.1

Kurzweil 250

1.2.2 Kurzweil 250X

1.2.3 KurzweiI 250 RMX

and

225 RMX

1.3 How the Kurzweil 250 Works

1.3.1

Masters Section

1.3.2 Assignments Section

1.3.3 Selection Section

1.3.4 Program Section

1.3.5 Media Section

1.3.6 Back Panel

Kurzweil 250 Service Manual, Chapter 1

1 - 1

1-2

1-3

1-4

1-5

1-6

1-7

1.1 -PRODUCT DESCRIPTION

The Kurzweil 250 uses artificial intelligence principles and a

Motorola

68000

microprocessor

create

complex

models of

acoustic sounds. The Kurzweil 250's design gives the instrument a

velocity-sensitive keyboard so that a

note's

volume·

and timbre

relates to the force

the key. The 12-note, polyphonic keyboard

can accurately reproduce the sounds of several instruments

once

and each key

the 88 note keyboard can be individually assigned

play a different sound.

Currently,

the

Kurzweil

250

comes

with

different

instruments arranged into 98 keyboard setups in the basic Enhanced

Resident Sound Block excluding Sound Blocks A thorugh

The

original Kurzweil 250 came with 30 different instruments arranged

into

keyboard setups.

The Kurzweil

250's

sequencer

is a

built-in,

12,OOO-note

multi-track digital recorder, which can be used to build up to 12

different tracks. Older Kurzweil 250's may have either 4,000 or

8,000 note sequencer. These units can be updated

the current

12,000 with the purchase of available options.

All

Kurzweil

250s

are

currently

manufactured

with the

Kurzweil Sound Modeling Program for user sampling. Older Kurzweil

250s may not have this option, but may be updated with the purchase

of the Sound Modeling Program option.

There are many configurations

Kurzweil 250s currently

the field. The Kurzweil 250 Product Line also includes the Kurzweil

250X,

expander unit without keyboard, and the Kurzweil RMX 250

or 225, a rack mount expander unit. Please see the Product History,

Chapter 2, for more information.

Kurzwell

250

Service Manual, Chapter 1

1 - 2

1.2 -SPECIFICATIONS

1.2.1 -

Kurzweil

250

Keyboard:

88 keys with velocity-sensing and piano action.

Pedals:

assignable piano-type

the POD,

external

volume-type

Dimensions

(Cabinet):

56"(L) X 27"(W) X 9"(H)

Dimensions

(POD): 22"(L) X

"(W) X 4.5"(H)

Weight

(Cabinet):

95 Ibs.

Weight

(POD): 22 Ibs.

Power

Consumption:

110/220 VAC, 50/60Hz, 380 watts

max.

Operating

Conditions:

0C Ambient 20 to

80%

Relative Humidity

Storage

Conditions:

-25

1250C,10 to 90% Relative

Humidity

Audio

Outputs:

High level, Low level, Balanced, Stereo

headphones

External

I/O: High-speed parallel computer port, MIDI In,

MIDI Out and MIDI Thru ports, Sync In, Sync Out, Trigger In,

Click Out, MIC, Line In, 2 External volume-type pedals,

cartridge slot

1.2.2 -

Kurzweil

250X

Dimensions

(Cabinet):

1/2"

(L)

1/2"

(W)

X 6

3/4"(H)

Dimensions

(POD): 22"(L) X 11"(W) X 4.5"(H)

Weight

(Cabinet):

45 Ibs.

Weight

(POD): 22

Ibs.

Power

Consumption:

110/220 VAC, 50/60Hz, 380 watts

max.

Operating

Conditions:

0C Ambient

80%

Relative Humidity

Storage

Conditions:

-25 to 1250C,10 to

900/0

Relative

Humidity

Audio

Outputs:

High level, Low level, Balanced, Stereo

headphones 1

External

I/O: High-speed parallel computer port, MIDI In,

MIDI Out and MIDI Thru ports, Sync In, Sync Out, Trigger In,

Click Out, MIC, Line

In,

2 External volume-type pedals

Kurzwell

250

ServiceManual, Chapter 1

1 - 3

1.2.3 -

Kurzweil

250 RMX AND 225 RMX

Dimensions

(Cabinet):

19"

(L)

X 22" (W) X 10 1/2"(H)

Weight

(Cabinet):

53 Ibs. r

Power

Consumption:

110/220 VAC, 50/60Hz, 380 watts

max.

Operating

Conditions:

0C Ambient 20 to

800/0

Relative Humidity

Storage

Conditions:

-25 to 1250

C,1

0 to

90%

Relative

Humidity

Audio

Outputs:

High level, Low level, Balanced, Stereo

headphones

External

I/O: High-speed parallel computer port, MIDI In,

MIDI Out and MIDI Thru ports, Sync

In,

Sync Out, Trigger In,

Click Out, MIC, Line

In,

2 External volume-type pedals

Kurzwell

250

ServiceManual, Chapter 1

1 • 4

1.3 -HOW THE KURZWEIL 250 WORKS

This section describes briefly how the Kurzweil 250 controls

work. Refer to the Kurzweil 250 rUser's Guide for more detailed

information. Since this is a complex instrument, always confirm

that

a problem

truly

exists before

attempting

to·

service the

instrument.

1.3.1 -

Masters

Section

The group of slider controls

the Masters section controls the

overall sounds that the instrument makes.

TUN

E - Use this slider control to control the overall pitch of

all active voices.

INSTRUMENT GROUPS A & B - These two sliders move two

different, assignable instrument groups from left to right in

the stereo image.

VOlUM

E - This controls overall volume.

1.3.2

Assignments

Section

This section

the Front Panel controls are used primarily

during live performance.

Each of the three vertical sliders can

assigned to control one

of approximately

different functions such as tremolo, pitch bend,

vibrato, legato, attack, decay and sustain. By using these controls,

you can simulate a wide variety of playing techniques, including a

full variety of synthetic effects.

Musicians can also assign the foot pedals and Mod

levers

using

switches

this section.

Kurzwell

250

Service Manual, Chapter 1

1 - 5

1.3.3 -

Selection

Section

The Selection area

the Front Panel contains the switches

that allow users to control the main r functions of the system. With

the LCD display, they tell what operating mode' the instrument is

and allow the musician to make changes and answer questions.

SPLIT KEYBOARD -This is another control used at per-

formance time. It allows you

assign a certain section of

the keyboard temporarily to a certain instrument.

CHORUS

-When you press this button, you can turn one sound

into many. The "Chorus" capability can be used for doubling,

built-in echo and flanging.

SELECTION SWITCHES -The YES,

and SELECT switches are

used to choose options and answer questions displayed

the

LCD.

NUMERIC KEYPAD -Use the numeric keypad to enter choices

and

select functions (with the "F" switch).

1.3.4 -

Program

Section

This group of controls, along with the numeric keypad, allow

you to program the Kurzweil 250. These controls are generally used

for setup before a performance.

CURSOR KEYS -The cross shaped group of keys below PLAY are

the cursor controls. The center key (R) is for resetting when

you have made a mistake or want to return to the initial cursor

placement.

EQU

ENCER - The Kurzweil 250's sequencer is a built-in,

12,000 -note multi-track digital recorder. You can use it to lay

down one instrument and then play a second instrument on top

of it.

repeating this process, you can build up to 12 diff-

erent tracks.

Other keys

this section speed up or slow down the tempo of a

piece, modulate

another key, change modes or edit keyboards,

instruments or sequences.

Kurzwell

250

ServiceManual, Chapter 1

. 1 - 6

t"--

1.3.5 -

Media

Section

The Media section lets

you

program, store and recall your

own

set of keyboard setups, instruments and .sequences.

LIST

-This key allows you to

run

through,

any order, every

keyboard setup stored

the Kurzweil 250's memory. You can

reprogram this list to meet you own performance needs. You

can also list sequences using this switch.

STORAGE - The Storage

READ

switch is used to prepare the

instrument to use a cartridge.

future versions of the in-

strument, the STORAGE switches will be used with external

media options.

1.3.6 -

Back

Panel

The back panel contains all the input/output connections for the

Kurzweil 250.

COMPUTER

-This

the parallel computer port for attaching a

personal computer

the Kurzweil 250.

TRIGGER

-The Trigger

a TTL-compatible input used for

starting a sequence from

external device. The sequence

triggers

the positive edge of the supplied pulse. Minimum

pulse width

1 microsecond. The input impedance is greater

than 10k ohms. The trigger level

2 volts. This I/O port takes

a 1/4 inch phone jack.

CLICK OUT -The Click Out is a TTL-level output pulse. When

enabled from the Front Panel, a positive pulse appears at this

output. Its repetition rate

the selected sequencer tempo.

Driving source

a low power TTL gate through a

ohm resis-

tor. This I/O port takes a 1/4 inch phone jack.

SYNC

-The Sync

a TTL-compatible input used

drive

the Kurzweil 250 from another instrument. The other instru-

ment

to provIde a square wave at X12

X96 the tempo. The

input impedance

greater than 10K ohms. The trigger level

2 volts and this I/O port takes a 1/4 inch phone jack.

Kurzwell 250 Service Manual, Chapter 1

1 - 7

SYNC OUT -The Sync Out is a TTL-level square wave. output

used to drive other instruments

synchrony with the Kurzweil

250. The repetition rate is normally X12 to X96 the tempo. The

driving source is a low powerr TTL gate through a

ohm

resistor. This I/O port takes a 1/4 inch phone jack.

MIDI

-This is a 31.2K baud, 5 milliamp serial input.

MIDI THRU -This is a 31.2K baud, 5 milliamp serial output.

MIDI OUT -This is a 31.2K baud, 5 milliamp serial output, the

same

MIDI

buffered.

-These are 2 VPP audio outputs, with a 600 ohm driving

source impedance. These require 1/4 inch phone jacks and are

suitable for line level inputs.

ill

-These are 20 VPP audio outputs, with a 600 ohm driving

source impedance. These require 1/4 inch phone jacks and are

suitable for directly driving power amplifiers and other high

level

inputs.

BALANCED

-These are

VPP audio outputs. They have XLR

connectors, floating outputs and a 600 ohm driving source

impedance.

EXTERNAL PEDALS 1 & 2 - The 1/4 inch phone jacks accept

assignable pedal functions (K250 and K250X only).

M.lQ.

-This digitizer input is a 200 mVPP full scale input. It

has a 47K ohm input impedance and accepts a 1/4 inch phone

jack.

LINE

-This digitizer input is a 1 VPP full scale input (300

rms.) It has a 10K ohm input impedance and accepts a 1/4

inch phone jack.

Kurzweil

250

Service Manual, Chapter 1

1 - 8

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