Mod K-977 Troubleshooting Supplement Download Page 3

Copyright © 2015 by modkitsdiy.com

“The Suspended Chime” (K-977) 

Schematic

+

-

9 VDC

Battery

Output

Input

DC Power 

Jack

center (-)

+5 VDC

5

4

6

+

-

220

Foot

Switch

(B)

25KL

BLEND

IN

G

N

D

O

U

T

78L05

Voltage 

Regulator

Foot

Switch

(A)

2

3

1

.1µ

2M

27K

MPSA18

C

B

E

68K

2.2K

Base

Emitter

Collector

MPSA18

NPN BJT

B

C

E

CN1

CN3

L

-O

U

T

R

-O

U

T

A

G

N

D

IN

-L

A

G

N

D

3

.6

V

M

U

T

E

F

N

D

-D

A

T

A

S

W

1

S

W

2

S

W

3

S

W

4

D

G

N

D

B

A

N

K

F

N

D

-C

L

K

5

V

_

IN

9

16 15 14 13 12 11 10

1

8

7

6

5

4

3

2

BTSE-16FX

Digital Sound Effector

Pin-side View

.1µ

IN-L

4

BTSE-16FX

1

L-OUT

16

78L05

IN

OUT

GND

2

1

3

5

4

6

S

W

1

S

W

2

S

W

3

S

W

4

9

12

11

10

5V_IN

14

A

G

N

D

3

6

D

G

N

D

2.2K

MPSA18

C

B

E

2M

Foot

Switch

(C)

9

8

7

.1µ

+

4700µ

10K

.002µ

1M

100K

10K

5.6K

.1µ

.1µ

3

2

1

A

B

C

3PDT 

Footswitch

6

5

4

9

8

7

P-H501

Effect Toggle 

Switch

P-H541

1

2

3

4

5

6

A

B

Toggle Switch

(A)

(B)

Chorus:

0101

Chorus/Delay:

1010

(0 = 0.0 VDC, 1 = 3.3 VDC)

H

W

Q1

Q2

2.6 

VDC

7.2 

VDC

2.0 VDC

9.2 VDC

6.8 

VDC

5.0 

VDC

0.8 VDC

8.8 

VDC

0.3 

VDC

0.0 

VDC

0.0 

VDC

 

Reviews: