Casio SK-8A Troubleshooting guide

CONTENTS

1.

SCHEMATIC

DIAGRAM

1-1.

Main

PCB

M3123-MA1M.

1

1-2.

Console

PCB

M3123-CN1M

.

2

1-3.

LED

PCB

M3123-LD1M

.

3

1-4.

Keyboard

PCB

M3129-KY1M

.

4

2.

PCB

VIEW

&

MAJOR

CHECKPOINTS

.

5

3.

MAJOR

WAVEFORMS.

6

4.

BLOCK

DIAGRAM.

7

5.

KEY

&

SWITCH

MATRIX.

8

6.

CPU

(MSM6283-05GS)

.

9

7.

PERCUSSION

GENERATOR

(MSM6294-02).

11

8.

MELODY

CIRCUIT.12

9.

SAMPLING

CIRCUIT.13

10.

PERIPHERAL

DEVICE

ACCESS.14

11.

ROM

PACK

ACCESS

.

15

12.

LED

DRIVE

CIRCUIT

.16

13.

RESET

&

POWER

ON/OFF

DETECTION

CIRCUITS.17

14.

POWER

SUPPLY

CIRCUIT

..

.18

15.

TROUBLESHOOTING

..19

PARTS

LIST

SK-8.20

SK-8A

.27

1.

SCHEMATIC

DIAGRAM

1-1.

Main

PCB

M3123-MA1M

A

I

B

To

LEDs

I

''

DC

!N

HEAD

PHONE

TC4066BP13/A

1

VA

?

co

kM

cn

p

cn

p-

In

<

o

o

o

o

olo

o

]

-J

-J

_l

-I

Jl

-J

J

■

f

iTunf

T-

r

nc

ut

■

i

n

n

ci

ci

col

co

co

I2SB12S6R

J2SCn4

0LNSR

<gv

IOV220M

T

Power

a.

Amp.

2

J

v

2

2

J

V

C22I

138

10V47M

|

Apo

[50V2.2A

IK

10KB

_,

MAIN

VR

1

-"—

"

5j—

t

Mixing

Amp.

5l)V1M

1

'*

Tuft

2

)

1

100K

~68K

r

iwtlHIwj

y

TC40S6BP

!3/4I

Go

in

Con

t

r

o

11

er

12SC1740LNSR

V0O_

>CV

15K

15K

15K

1

-2.

Console

PCB

M3123-CN1M

A|B_j_C[0|E_j_F|G|H

A

B

C

D

E

F

G

H

J_j_K|L|M|N_j_0|P

-2

-

i

2

j

3

L

5

6

7

8

9

10

I

!

ii

i

I

i

wr

MAIM

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