R50 10k

C2

5 4

7

C2

1 4

7

7654

8911 10

321

121314

6

9

541

872 3

MAIN VOL. B. BALANCE P.C. BOARD M3-4502A/B

TONE CONTROL P.C. BOARD M3-4503

MAIN AMP. P.C. BOARD M3-4504A

LED P.C. BOARDM3-4504C

TAPE P.C. BOARD M3-4501B

INPUT P.C. BOARD M3-4501A

19

12

20

22

21

15

16

18

17

11

25

13

78 9

4

5

3

628 2627

1

2

23

24

14

3

10

6

51

9

4

5

6

7

8

1

2

3

4

2

51

3

4

1

2

35

6

2

8

4

7

1

2

3

1

1 1 1

2

3

7

2 1 3

8

9

10

11

12

5

6

4

10

RED

RED

ORG

BRN

ORG

WHT

WHT

WHT

BLK

VLT

VLT BLU

REDORG

ORG

WHT

WHT

BLK

VLT

VLT YLW

REDORG

ORG

WHT

WHT

BLK

VLT

VLT WHT

BLU

GRN/YLW

BRN

J903

SW901

REDORG

ORG

WHT

WHT

BLK

VLT

VLT BLU

BLU

GRN/YLW

BRN

CEE

!

!

! C9014700p/250

!

!

C9024700p/250

C9010.01/125(P)

T901AM-2450T-40

F2 630mAT

F3 4AT

!

!

F1 630mAT

F4 4AT

!

!

!

SW901

SW901

J902

J902

!

!

!

!

!

!

! !

C9014700p/250

! C9024700p/250

T901AM-2450T-50

F2 630mAT F2 800mA

F3 4AT

!

! !

F1 630mAT

F4 4AT

!

!

!

F5 2AT F3 3.15A

F2 250/2A

F1 800mA! SW

ITC

HE

D

UN

SW

ITC

HE

D

T901AM-2450T-20(AAL)AM-2450T-30(CSA)

!

!

T901AM-2450T-70

!

F1 250/4A

F3 250/2A

SW

ITC

HE

D

UN

SW

ITC

HE

D

! C9010.01/500(P)

SW901 !

!

J903!

AC 220V

UK

AC 240V

CSA, AAL

AC 120V

U/T

AC 110V to 240V

AC OUTLET

AC OUTLET

R9 (FS) 470

R12.2k

TR1

R4 470k

R1

11

60

k

R9

16

0k

R1

0

39

k

R1

2 3

9k

R239k

R14.7k

VR2 250k(B)

VR1 250k(MN)

R168k R2 2.2k R3 220k

R4 180k R6

68

k

R8

1.2

k

C5 2.2

C8 (LL) 1

IC1 LA3133

10

0p

C3

0.0

01

C4

47

10

C1

11

00

/35

C1

0.4

72

5(M

)

R8

30

0

R2

27

0k

R1

0 6

.8k

R1

4 4

7k

R6

5.6

k

R3

10

k

R5

10

0k

R7

75

0

C4 47/10

C2

10

0pC3

100/35

C5 10p500(D)

C1 0.125(M)

C64.7/25

C80.015

C7

47

/10

C1

0 0

.00

33

R1

1 1

.5k

VR

1 5

0k(

C)

C90.1525

R12100k

R133.3k

C1

1 0

.02

7

R1

5 6

20

VR

2 5

0k(

C)

TR2

TR1,2 2SC2240(GR,BL)

R7

1k

C2 (LL)4.7/25

C1

22

/10 R5 16k

C70.0018(J)

C90.0047(J)

0.047(Z)

C1 220p(K)

C2 0.012

R322k

R1

47

k

R7 47k VR

1 1

kB

R83.3k

R533k R9 3.3k

R24.7k

TR1

TR2

TR15

TR11 TR12

TR4TR16

TR7

TR5

C3 330p

C6 33p

C2

10

0p

C9330p

C8 100p

C733

R33.6k

C547/10

R11 100

R1

0 2

.2k

R1

4 (

FS)

15

0

R13 (FS) 4.7

R17 5W0.47(K)

R20 2.7k

R19 2.7k R21 15k

R22 15k

TR9

TR10

TR13

TR14

TR9 2SC2240(GR,BL)TR10 2SA1015(O,Y,GR)

D1

1S2

47

2

D3

1S2

47

2

R26 47k

R3

1 7

5kR27

220

D2

1S2

47

2

C1

0 3

.3

R3

2 5

.6k

R4

0 1

W2

20

(K)

R3

0 1

0k

R2

8 2

2k

R3

3 1

0k

R3

7 8

.2k

R3810kR

23

(FS

)1

/2W

10

R3

5 3

9k

R3

6 2

2

R42 24k

C200.047(Z)

R4118kC

17

2.2

/25

C1

62

20

/10

D51S2472

R59 1/2W 2.2k

TR13 2SC536(G,H)TR14 2SD571(K,L)TR1 2SA979(G,H)

TR5 2SC2235(O,Y)TR7 2SD718(R,O)

TR2 2SC2229(O,Y)TR3 2SA1015(O,Y,GR)

TR6 2SA965(O,Y)TR8 2SB688(R,O)

R1

2(F

S) 8

20

R2

4 (

FS)

1/2

W 1

0

C1

20

.1(Z

)

C1

50

.1(Z

)

C1

10

.1(Z

)

C1

94

70

/6.3

C1

40

.1(Z

)

C1

30

.04

7(Z

)

R3910k

R34 5.6k

RL1MS24D4-0Z

C1

84

70

/6.3

C3333/25(M)

C33, C36 - non polar

C3633/25(M)

R442W220(K)

432W220(K)

R55 27K

R54 27K

R5

8 1

/2W

1.5

K

R4

8 1

/2W

3.3

K

R4

9 5

1K

R5

3 4

.7K R57 330

R51

R56 4.7k

R46 1k

R5

2 3

30

R45 (FS) 27

C3

4 0

.00

68

C2

2 1

00

/63

C3

5 0

.00

68

VR

3 5

00

B

VR

2 5

00

B

C903

D1

31

S24

73

D6

RD

36

E(C

)

U/T, CSA, AAL

D1

SY-4

05

D

IC1 TA7318P

D141S2473

D8GP08D

D7

CEE, UK

CEE, UK

U/T, CSA, AAL

D9-D12GP30G

C29-C320.01/500(P)C30 C29

L2 2.2 H(K)µ

L2 2.2µH(K)

L1 2.2 H(K)µ

L1 2.2 H(K)µ

R47(FS) 1/2W 10R29(FS) 1/2W 10

C31

D10 D9

D11D12

C32

C904

IND901

R4

4.3

k

R6

2

.2k

C40.0012

C10

D41S2472

TR11, 12, 152SC1815(O,Y,GR)

R25 1k

TR3

R18 5W0.47(K)

R1

5 (

FS)

15

0

TR8

TR6

R16 (FS) 4.7

10000/52 10000/52

C2

3 2

20

63

C280.01500(P)

C24 0.01500(P)

C2

6 3

3

C2

7 1

00

63

2.2k

GP08D

C6

120V

32V AC

0V

0V

220V

110V

42.6

V A

C

32V AC

8.3V AC

0V

0V

0V

20

.0

2.4

1.7

1.2

35.5

35.5

6.7

1.9

33.2

0.6 0

0.6

14

.9 29.8

1.8

6.9

0.6

0 0.6

14

.6

1.8

35.5

0.2

-45

.0

-45.0

-41

.0

-41

.0

0.7

-0.5

-1.0

-1.0

-0.5

-44.5

-46

.1-4

4.3

-41

.0

0.7

1.2

44.5

44.5

0.7

0.1

0

0

0

32.1

32

.4

-1.9

8.7

31.8

8.1

8.8

-8.5

-0.5

36.8

35.5

35.5

35.5

44.4

0

032.4

-8.5

8.7

-0.5

0 0-8.5

240V

-44.3

0

-0.5

54.6-46.1

-46.1

-57.8

-46.737.3

-44.5

44.544.4

-44.5-44.3

-45

.0

-41

.0

-45.0

-41

.0

12

1110

9

8

7

6

54

3

2

1

OFF

A+B

A

B

STEREO MONO

SELECTOR

TUNER PHONOAUX

TAPE MONITOR

SOURCE TAPE2 DUB 2-1DUB 1-2 TAPE1

SW902

SPEAKERS

LOUDNESS MODEBALANCE

VOLUMEB

ASS

TREB

LE

SW1-2a

SW2

SW1

OFF ON

SW1-2b

SW1-1

OFF ON

LEFT ME902

RIGHT ME901

LEV

ELM

ETER

LEVELMETER

IDLI

NG

CU

RR

ENT

33 32

34

43

41

46

45

44

IDLI

NG

CU

RR

ENT

30 31

29

40

39

38

37

36

35

MARK PARTS ARELOCATED ON MAINAMP. P.C. BOARDM3-4505B

42

AM-2450 SCHEMATIC DIAGRAMThis is a custom vector drawing based on AKAI original schematic, made by my own. The size is ISO A2 (594x420 mm) but may be scaled to any size for printing and/or viewing.You may download to a local hard disk extracts and/or print this document for personal (non commercial) and educational use only. Commercial copying, hiring, lending of this document or any part of this document is prohibited.You may not distribute or commercially exploit the content. Nor may you transmit it or store it in any other website or other form of electronic retrieval system. In all cases this notice must remain intact. Copyright © 2017. by Mrki, AK member (www.audiokarma.org)

ALL VERSIONS

NOTE: Your use of this document is entirely at your own risk, for which I shall NOT BE LIABLE. Thus, that assumes or undertakes NO LIABILITY for any loss or damage suffered as a result of the use, misuse or reliance on the information and content on this document. All of the information provided in this document is provided "AS-IS" and with NO WARRANTIES.

Published on http://akdatabase.com/AKview/

WARNING: DENOTATES SAFETY CRITICAL COMPONENTS. FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPONETS ONLY WITH MANUFACTURER’S RECOMMENDED PARTS.

! NOTE

1. UNLESS OTHERWISE SPECIFEDALL REISTORS IN OHMS 1/4W (J)ALL CAPACITORS IN uF 50WV (K)

2. (LL) = LOW LEAKAGE CAPACITORS3. (FS) = FAIL SAFE RESISTORS4. MARK INDICATE NON POLAR

ELECTROLYTIC CAPACITORS

NO. 2-2 1562041A

2SA10152SC5362SC18152CS2240

E C B

2SA9652SC22292SC2235

E C B E C B B C E

B C E C B

E C B

2SD571 2SD612K 2SA979 2SB6882SD718

AM-2450SCHEMATIC DIAGRAM

AVERTISSEMENT: IL INDIQU LES COMPOSANTS CRITIQUES DE SURETE. POURMAINTENIR LE DEGRE DE SECURITE DE L’APPAREIL NE REMPLACER LES COMPOSANTS DONT LE FONCTIONNEMENT EST CRITIQUE POUR SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT.

!

L

R

TUNER

AUX

L

R

PHONORIGHT

TM901

LEFT

RIGHT

LEFT

fe

f

f

e

e

ba

dc

L

R

L

R

REC

PLAY

TAPE 1

L

R

L

R

REC

PLAY

TAPE 2

1 42

3 5

REC/PLAY

DIN

J5

SPEAKER

B A

TM902

PHONES

POWER LEVEL METERS

J901

J1

L

R

J2

J4

J3

d

b

c

a

dc

ba