Text preview for : AKAI AM32.pdf part of AKAI AM32 Is not the original schematic of AKAI AM32. Manual traced following traces and solder points. I think it is util to someone.



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AKAI AM-32 (60W-channel)
IMPORTANT : this is not the original AKAI AM-32 schematic . I have copied this scheme,following the traces and solders of PCB board of the amplifier ,when i repaired it. I don't guarantee that the whole scheme is exact and my instrument is not very precise, then IF YOU USE IT ,YOU DO IT TO YOUR RISK. Also, the schematic is not complete , but include the following circuits: - left channel final amplifier (note that the right channel has the same component's name of left channel ) - final power supply - safety circuit - switch board (D board) - some components data Do not include primary power supply

Traced by MPANTEC ,with TARGET3001 FOR PCB POOL ,

W102

R116 680ohm +B1(+56V6)

W111
R L

-B(-66V6)+B(+66V6) LEFT IN
L4

primary supply (not traced here)

+B
R105 3K

220V~ 50Hz

start F1 S1 Fuse
L1 L2

R112 3K D3 C122
L3

~

BR1 D1 + D2
+

DZ114

DZ113

R101 100

D4 ~

+VCC(+43V) 56V2 4700uF C101
+

56V R106 220

+15V +24V(26V7) -15V R151 R150 4700uF +VCC C131 4u7 50V -0V71 +
R102 100 C134

IC102 HA12002
Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 Pin8

R

D109

D108

R108 92

+VCC -B R153
C114 C114

-1V58

D104

D103

-65V6

TR103 2SC2910 -66V4 R110 100

-66V6 R111 47K

C119

R152

C119

R152

R107 92

W104

-VCC(-43V)

-0V77 TR102 2SC3381 (DUAL NPN)

+B1

TR104 2SA970 56V8 C103
C116

TR105 2SA970

56V3 DL112 C102 TR116 2SA970

TR113 2SA970 LED 54V7

R149

TR106 2SC2910 -65V9 R120 220 R156 22K D102 1N4148 -65V2 collector of TR111 right channel +VCC

R115 220 -B

R134

+

C113 TR112 2SA970

R135 47K +VCC R130 27K C105 TR109 2SC3119 R124 3K -0V18 1V12 R157 68 0V6 R127 16 +24
R126 100

43V7

SAFETY TR111 2SC2240 R133 148K

R145 47K

D107 1N4148

TR902 2SC3854 +VCC D106 1N4148

VR101 1K

TR901 2SC3116

D110

1/2 R1 0R22

L101 0V Rel1 R144 10 J101 RIGHT OUT LEFT OUT

-0V5
R125 1K5

1/2 R1 0R22 -0V6 TR110 2SA1248 -1V12 R159 68 R128 16

R143 10

R136

C111 -VCC TR903 2SA1490 C112

+15V IC101 5218 1
R118 470K R138

8 3 + R137 -15V 4 2

R119 470K

C107

C133 C132

-VCC C106

R140

C108

R139 C142 R142 R147

+

C109

R141

FEEDBACK
+

D-BOARD
W8
L TO LED PANEL R R TO B-BOARD

W7
DAT/TAPE2 R G L G R G L

L TO B-BOARD

L

W10 R

L

w9

JW48
L

JW47 SW2
DIRECT

W11

AUX

W6
TUNER R G L G R G L

FROM A-BOARD J2

R

L

JW49 JW50

R

PHONO

W5
R G L G R G L CD

ALL SWITCHES
PRESSED

UNPRESSED

from power supply

J1

to bottom board

JW51

1 2 3 4 5

OUT1 -IN1 +IN1 VEE
substrate

C

VCC OUT2 -IN2 +IN2
6

2SC3881 B E E B

C

7

1 2
D 1

rel่ driver GND

temperature revealing

audio signal IN AC detect

overload revealing BIAS

positive feedback

IC101 (155218)
HA12002 3 4 5 6 7 8
substrate

G S S G D

2 3 4 5 6 7 2SK389