Casio CPS-85 User manual

CPS-85

ELECTRONIC KEYBOARD

POWER VOLUME TRANSPOSE

OFF ON MIN MAX F#GA BC D EAB C

#EF DIGITAL EFFECT TONE MEMORY

PIANO 1

PIANO 2

E. PIANO 1

E. PIANO 2

HARPSI-

CHORD

VIBRA-

PHONE

PIPE

ORGAN

JAZZ

ORGAN

STRINGS

SYNTH-

STRINGS

SELECT SONG A

SONG B RECORD STOP START

CONTROL DEMO

15 10152025

— 1 —

CONTENTS Page

Specifications ............................................................................................................................................ 1

Block Diagram........................................................................................................................................... 3

Circuit Description ..................................................................................................................................... 4

Major Waveforms .................................................................................................................................... 11

Printed Circuit Boards ............................................................................................................................. 12

Schematic Diagrams ............................................................................................................................... 13

Exploded View ....................................................................................................................................... 19

Parts List ................................................................................................................................................. 21

SPECIFICATIONS

GENERAL

Keyboard: 88 full size keys with initial touch response

Polyphony: 24 notes maximum

Tones: 10 (with layering)

Tuning curves: 3 types (preset for each tone)

Digital effects: REVERB

Demo tunes

Number of tunes: 10

Titles: 1. Grande valse brillante

2. Turkish March

3. One-Eighty

4. Opaque Mist

5. Harmonious blacksmith

6. Dream Sequence

7. Fugue in G minor

8. Moveable Blues

9. Rainbow

10. Ave Maria

Playback: Repeat sequential play of all tunes; playback always starts from begin-

ning of tune

Manual memory

Type: Real-time recording and playback

Number of songs: 2 (SONG A, SONG B)

Capacity: Approximately 1,200 notes (SONG A + SONG B)

Back-up: Power supplied by batteries or AC adaptor

Pedal: Damper

Other features Transpose (±1 octave, semitone steps)

Tuning (adjustable, A4 = 440 Hz ±50 cents)

MIDI: 8-channel multi-timbre reception

Speakers: 14 cm ×2 (6 W + 6 W)

Terminals: PHONES (standard stereo jack ×1)

LINE OUT (standard mono jack ×2)

Output impedance: 1.0 KΩ

Output voltage: 1.5 V (RMS) MAX

LINE IN (standard mono jack ×2)

Input impedance: 47 KΩ

Sensitivity: 200 mV

MIDI OUT/IN (DIN jack ×2)

— 2 —

ELECTRICAL

Current drain with 12 V DC:

No sound output 240 mA ±20 %

Maximum volume

with 24 keys from C1 to B2 pressed in Jazz organ tone 2050 mA ±20 %

Volume: maximum, Touch response: maximum

Phone output level (Vrms with 8 Ωload each channel):

with key E3 pressed in Jazz organ tone L-ch 60 mV ±20 %

R-ch 65 mV ±20 %

Speaker output level (Vrms with 4 Ωload each channel):

with key E3 pressed in Jazz organ tone L-ch 860 mV ±20 %

R-ch 920 mV ±20 %

Lineout output level (Vrms with 47 kΩload each channel):

with key B5 pressed in Jazz organ tone L-ch 140 mV ±20%

R-ch 160 mV ±20%

Minimum operating voltage: 6.5 V

DAMPER PEDAL (standard mono jack ×1)

DC 12 V (DC jack ×1)

Power supply Dual power supply system

Batteries: 6 D-size batteries

Battery life: Approximately 4 hours on manganese batteries

AC adaptor: AD-12

Auto power off: Turns power off approximately 5 minutes after last key operation.

Enabled under battery power only, can be disabled manually.

Power consumption: 18 W

Dimensions (HWD): 100 ×1372 ×414 mm (without stand)

(3-15/16 ×54-1/16 ×16-5/16 inches)

Weight: Without stand and excluding batteries 16.8 kg (37.1 lbs)

— 3 —

BLOCK DIAGRAM

Buttons

Keyboard

FI0 ~ FI10

SI0 ~ SI10

KC0 ~ KC7

KI0 ~ KI2

MIDI

INOUT

Working Storage

RAM (64K-bit)

LSI2

HY6264ALLJ-70

MA0

MA12

MD0

MD7

MD0 ~ MD15

MA1 ~ MA19

Sound Source ROM

(8M-bit)

LSI3

MX23C1610MC-12

CPU

LSI4

GT913F

BCK, SO, LRCKMA0, MA1

EA0 ~

EIO0 ~

EA14

EIO7

Effect RAM

(256K-bit)

LSI5

TC55257DFL-70L

DSP

LSI1

HG51B277FB

LEDs

VDD

SONGA

SONGB

DIGITAL EFFECT

SELECT

STOP

LRCK SO

Rmel Lmel

BCK

D/A Converter

LSI6

UPD6379GR

Filter

IC104

Main

Volume

Power Amplifier

IC101

LA4620

Output

Speakers

Reset IC

IC 1

RN5VD35AA

Pre. Amp.

IC103 Line In

POWER (APO) Power Supply Circuit

Q101 ~ Q106

D108, D110, D111

6 ×D-size batteries

AC adaptor AD-12

From CPU

Line Out

AVCCVDD VCC AVDD LVDD

— 4 —

CIRCUIT DESCRIPTION

KEY MATRIX

Note: Each key has two contacts,

the first conatct (1) and second contact (2).

Key

Second contact (2) First contact (1) KC

0CK1CK2CK3CK4CK5CK6CK7CK

0IF)1(0A)1(0#A)1(0B)1(1C)1(1#C)1(1D)1(1#D)1(1E

0IS)2(0A)2(0#A)2(0B)2(1C)2(1#C)2(1D)2(1#D)2(1E

1IF)1(1F)1(1#F)1(1G)1(1#G)1(1A)1(1#A)1(1B)1(2C

1IS)2(1F)2(1#F)2(1G)2(1#G)2(1A)2(1#A)2(1B)2(2C

2IF)1(2#C)1(2D)1(2#D)1(2E)1(2F)1(2#F)1(2G)1(2#G

2IS)2(2#C)2(2D)2(2#D)2(2E)2(2F)2(2#F)2(2G)2(2#G

3IF)1(2A)1(2#A)1(2B)1(3C)1(3#C)1(3D)1(3#D)1(3E

3IS)2(2A)2(2#A)2(2B)2(3C)2(3#C)2(3D)2(3#D)2(3E

4IF)1(3F)1(3#F)1(3G)1(3#G)1(3A)1(3#A)1(3B)1(4C

4IS)2(3F)2(3#F)2(3G)2(3#G)2(3A)2(3#A)2(3B)2(4C

5IF)1(4#C)1(4D)1(4#D)1(4E)1(4F)1(4#F)1(4G)1(4#G

5IS)2(4#C)2(4D)2(4#D)2(4E)2(4F)2(4#F)2(4G)2(4#G

6IF)1(4A)1(4#A)1(4B)1(5C)1(5#C)1(5D)1(5#D)1(5E

6IS)2(4A)2(4#A)2(4B)2(5C)2(5#C)2(5D)2(5#D)2(5E

7IF)1(5F)1(5#F)1(5G)1(5#G)1(5A)1(5#A)1(5B)1(6C

7IS)2(5F)2(5#F)2(5G)2(5#G)2(5A)2(5#A)2(5B)2(6C

8IF)1(6#C)1(6D)1(6#D)1(6E)1(6F)1(6#F)1(6G)1(6#G

8IS)2(6#C)2(6D)2(6#D)2(6E)2(6F)2(6#F)2(6G)2(6#G

9IF)1(6A)1(6#A)1(6B)1(7C)1(7#C)1(7D)1(7#D)1(7E

9IS)2(6A)2(6#A)2(6B)2(7C)2(7#C)2(7D)2(7#D)2(7E

01IF)1(7F)1(7#F)1(7G)1(7#G)1(7A)1(7#A)1(7B)1(8C

01IS)2(7F)2(7#F)2(7G)2(7#G)2(7A)2(7#A)2(7B)2(8C

0IK

LATIGID

TCEFFE /1ONAIP

2ONAIP /1ONAIP.E

2ONAIP.E

-CISPRAH

/DROH

-HPARBIV

ENO

EPIP

/NAGRO

ZZAJ

NAGRO

/SGNIRTS

HTNYS

SGNIRTS TCELES /AGNOS

BGNOS

1IKDROCERLORTNOCOMED -OPSNART

#FES -OPSNART

#GES -OPSNART

#AES -OPSNART

DES -OPSNART

EES

2IKPOTSTRATS -OPSNART

GES -OPSNART

AES -OPSNART

BES -OPSNART

#CES

— 5 —

NOMENCLATURE OF KEYS

POWER SUPPLY CIRCUIT

The power supply circuit generates five voltages as shown in the following table. VDD voltage is always

generated. The others are controlled by POWER signal from the CPU.

RESET CIRCUIT

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The

CPU then initializes its internal circuit, and clears the working storage RAM.

When the power switch is pressed, the CPU receives a low level signal. The CPU sends POWER signal

to the power supply circuit, also sends a reset signal to the DSP.

When the keyboard is powered by batteries and no operation is made for six minutes, CPU drops signal

POWER to shut all the voltage except VDD off.

C#2 D#2 F#2 G#2A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#6 D#6 F#6 G#6 A#6 C#7 D#7 F#7 G#7 A#7

D2 E2 F2 G2 A2 B2C1 D1 E1 F1 G1 A1 B1A0 B0 C3 D3 E3 F3 G3 A3 B3

C#1 D#1 F#1G#1A#1

A#0

C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 D6 E6 F6 G6 A6 B6C6 C7 D7 E7 F7 G7 A7 B7 C8

Reset IC

IC1

RN5VD35AA

DSP

LSI1

HG51B277FB

VDD

Reset signal

To power supply circuit

VDD Battery set

RESET

VDD

Power switch NMI

POWER

PLE

CPU

LSI4

GT913F

SCKO

emaNegatloVfonoitareporoF

DDVV5+ MARtceffE,MARegarotsgnikroW,MORecruosdnuoS,PSD,CIteseR,UPC

DDVAV5+skcajnieniL,CAD

DDVLV5+pmaltoliP

CCVV9+reifilpmarewoP,skcajtuoeniL

CCVAV9+.pmAerP

— 6 —

CPU (LSI4: GT913F)

The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.

The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from

the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with

the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the

CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores

sequencer data into the working storage RAM.

The following table shows the pin functions of LSI4.

.oNniPlanimreTtuO/nInoitcnuF

10DXTtuOtuptuolangisIDIM

20DXRnItupnilangisIDIM

30KCStuOtuptuolangis)FFOrewoPotuA;OPA(REWOP

41DXT— .dnuorgotdetcennoC.desutoN

51DXRnItupnilangisNOrewoP

61KCStuOtuptuoeslupgnizinorhcnysZHM1

9~7

,0NA,CCVA

1NA

—.dnuorgotdetcennoC.desutoN

01DNGAnIecruos)V0(dnuorG

11KCBtuOtuptuokcolctiB

21OStuOtuptuoataddnuoslaireS

31KCRLtuOtuptuokcolcdroW

41DNGnIecruos)V0(dnuorG

61,511TLX,0TLXtuO/nItuptuo/tupnikcolczHM42

71CCVnIecruosV5+

91,811DOM,0DOMnI.dnuorgotdetcennoC.lanimretnoitcelesedoM

02BTSRnItupnilangisteseR

12IMNnItupnilangisNOrewoP

22TNI— dnuorgotdetcennoC

03~32 3IF~0IF

3IS~0IS nIlangistupniyekroflanimreT

83~137CK~0CKtuOlangisnacsyekroflanimreT

25~93

01IF~4IF

01IS~4IS

nIlangistupniyekroflanimreT

55~352IK~0IKnIlangistupninottubroflanimreT

65BNWMtuOPSDehtroflangiselbaneetirW

67~7591AM~0AMtuOsubsserddA

770BSCMtuOMORecruosdnuosehtroftuptuolangiselbanepihC

871BSCMtuOdesutoN

972BSCMtuOPSDehtroftuptuolangiselbanepihC

08CCVnIecruosV5+

18DNGnIecruos)V0(dnuorG

28BDRMtuOMORecruosdnuosehtroftuptuolangiselbanedaeR

89~3851DM~0DMtuO/nIsubataD

99ELPnI lanimreteht,rotpadaCAnaybderewopsidraobyekehtnehW langisfforewopotuadnestonseodUPCehttahtostlov0semoceb .tiucricylppusrewopehtot

00171PnItupniladeP

— 7 —

DIGITAL SIGNAL PROCESSOR (LSI1: HG51B227FB)

The DSP receives 16-bit serial sound data from the CPU and adds the selected effect to the sound data using

the effect RAM. Then the DSP provides the sound data to the DAC. The DSP also drives LEDs.

The following table shows the pin functions of LSI1.

.oNniPlanimreTtuO/nI noitcnuF

08,4~14BP~0BP— .dnuorgotdetcennoC.desutoN

5OStuOCADehtroftuptuoataddnuoslaireS

6OKCWtuOCADehtroftuptuokcolcdroW

73DDVnIecruosV5+

8TSET—desutoN

9BSERnItupnilangisteseR

012SSVnIecruos)V0(dnuorG

21,11TUOX,NIXtuO/nItuptuo/tupnikcolczHM61

31IKCWnIUPCehtmorftupnikcolcdroW

41ISnIUPCehtmorftupniataddnuoslaireS

51IKCBnIUPCehtmorftupnikcolctiB

61CNISnItupnieslupgnizinorhcnyszHM1

712DDVnIecruosV5+

52~817OI~0OItuO/nIsubataD

62BECRtuOMARegarotsgnikrowehtroftuptuolangiselbanepihC

723SSVnIecruos)V0(dnuorG

821DAnIsubsserddA

92BEO— .dnuorgotdetcennoC.desutoN

03BEWnIlangiselbaneetirW

133DDVnIecruosV5+

232ECnI.evitcahgiH.tupnilangiselbanepihC

330DAnIsubsserddA

43B1ECnI.evitcawoL.tupnilangiselbanepihC

34,14~537OIE~0OIEtuO/nIMARtceffeehtrofsubataD

,84~64,44,24

16,95~15

41AE~0AEtuOMARtceffeehtrofsubsserddA

54BECEtuOMARtceffeehtroftuptuolangiselbanepihC

94BEOEtuOMARtceffeehtroftuptuolangiselbanedaeR

053SSVnIecruos)V0(dnuorG

06BEWEtuOMARtceffeehtroftuptuolangiselbaneetirW

87,47,07,66,262SSVnIecruosdnuorG

97,57,17,76,362DDVnIecruosV5+

,96,86,56,46

37,27 5AP~0APtuOtuptuolangisnacsnottuB

77,677/6APtuOdesutoN

— 8 —

FILTER BLOCK

Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the

waveforms.

DAC (IC1: UPD6379GR)

The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the

melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into

analog waveforms and output them to each channel separately.

Synch signal

Data

Word clock

Bit clock

Data

Word clock

Bit clock

DSP

LSI1

HG51B277FB

DAC

LSI6

UPD6379GR

CPU

LSI4

GT913F

L OUT

R OUT

LRCK

CLK

WCKO

SCK1

LRCK

BCK

SINC

WCKI

BCKI

AVCC

Left

Right

From DAC

To main volume

To main volume R

AVCC

10 µF

15 V10 µ

10 K

C472(H)

100 K

2.7 K

R154

100 K

C152(H)

C221B(A)

C152(H)

C221B(A)

2.2 K

10 K10 K

10 K10 K10 K

AGAG

M5218APR

(1/2) ×2

IC104

–

— 9 —

POWER AMPLIFIER (IC101 : LA4620)

The power amplifier is a two-channel amplifier with standby switch.

16 2 10 11 13

Pre-drive

Amp.

Input

Amp. Power

Amp.

–

Pre-drive

Amp.

Input

Amp. Power

Amp.

–

Input

Amp. Pre-drive

Amp. Power

Amp.

–

Input

Amp. Pre-drive

Amp. Power

Amp.

RL Short

Protector

RL Short

Protector

Terminal

Protection

Circuit

Pop Noise

Prevention

Circuit

Ripple

Filter

IN11+

IN11–

IN12–

IN21+

IN21–

IN22–

NC DC MUTE ADJ

Boot11

OUT11

PoGND1

OUT12

Boot12

VCC1

Boot21

OUT21

PoGND2

OUT22

Boot22

VCC2

PriGND

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