Yamaha KXE-300 Schematic

ABCDE FGH

B

C

E

B

C

E

PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS.

2SD23942SB1237

2SD1858

DTC114ES
DTC144ES
2SC1740S
2SD1915F
2SA933S
DTC143XS

2SB1237

µPC1330HAAll diodes

Anode

Cathode

1

9

BA6138

1

9

LB1641 CXA1560SNJM7812FA

AN78N05

M38B57M6-135FP

1

10

E

C

B

NJM2043L-D

1

8

OUT

COM

IN

E

C

B

1

11

22

CXA1597P

124

25

40

4164

65

80

1

8

16

IC103 : NJM7812FA
IC104 : NJM78N05
Voltage Regulator

IC101 : LB1641
Motor Driver

IC102 : BA6138
1/2 Power Compressor Amp.

IC201 : uPC1330HA
2 ch Head Selector

IC202 : NJM2043L-D
OP Amp.

IC203 : CXA1560S
Dolby B-C NR

IC204 : CXA1597P
Recording Equalizer

INPUT

OUTPUT

COMMON

23

P1

5

IN 1

1

GND

4

VZ

6

IN 2

OUT 18VCC 210OUT 2

9

P2

INPUT LOGIC

PRE DRIVER

7

VCC 1

9

4

3 218 7 5

6

Vreg

COMP

COMP

AMP AMPOUT OUT

MUT

Vcc

DET1 DET2 GND

IN2

OUT1 OUT2MUT

IN1

INVERTER

COMPARATOR

1

SWR 1

2

GND

3

SWP 1

4

CONT

5

GND

6

VCC

9

SWR 2

8

GND

7

SWP 2

–IN

1

2

+IN

1

3

–V

CC

4

+IN

2

5

–IN

2

6

OUT

2

7

+V

CC

8

OUT

1

1

–

+

–

+

22 21 20 19 18 17 16 15 14 13 12

1234567891011

IREF

MOA

MOA

SSK

SSK

HLS

HLS

HDET LDET

LDETHDET

LLS

LLS

REC AMP

REC AMP

Mode

Control

Vcc

V

EE

VCT

PBIN1

LINEIN1

MPXIN1

MPXOUT1

LINEOUT1

TCH1

TCL1

RECOUT1

MODE

VCC

IREF

PBIN2

LINEIN2

MPXIN2

MPXOUT2

LINEOUT2

TCH2

TCL2

RECOUT2

NRSW

VEE

CONTROL

VG

BIAS

REC EQ1

REC EQ2

Gp CAL

REC MUTE

REC CAL

REC IN2

IREF

BOOST2

VCC

REC OUT2

SPEED

TAPE EQ

DGND

REC IN1

GND

BOOST1

VEE

REC OUT1

1611521431341251161079

8

The voltages are measured using normal tape in the
PLAY mode (no-signal condition).
Only the voltage in ( ) are in the REC mode.

0(0)

0

2.6

2.1

4.7 4.7

4.8

-0.1

-0.1

4.7

(4.7)

4.2(4.2)

4.2(4.2)

0(0)

-0.1

0

0

0

4.8

0

0

0

0

4.6

0

00

0

~

0(4.7)

4.8

00000

0

4.7

2.2

2.0

~~2.0

2.0

~~~~~~~

0

-16.3

-16.3

-16.3

-16.3

~~~

-19.3

-19.3

-19.3

-19.3

-19.3

-19.3

-19.3

~

~~~~~~~

0000000

0

4.704.6(4.7)

1.7(1.6)04.7

4.8

4.8

0

0

-22.2

4.5

~

~

~

-19.3

-19.3

-19.3

-19.3

-19.3

-19.3

-19.3
~

0(0)

0(0)

4.6(4.7)

0

(0)

0(0)

0(0)

0(0)

0(0)

0(0)

0(0)

0(0)

0(0)

4.2
(4.2)

~(~)

~(~)

12.0(12.0)

12.0(12.0)

12.0(12.0)

12.1(12.1)

12.1(12.1)

11.3(11.3)

0(0)

0(0)

0(0)

0(4.7)

0(0)

8.6(4.9)

0(0)

0(0)

0(0)

4.4(5.1)

4.4(5.1)

4.4(5.1)

0(0)

0(0)

0(0)

0(0)

4.2
(4.2)

4.2
(4.2)

4.4
(5.1)

4.4(5.1)

4.5(5.1)

8.6(9.9)

6.0 (6.0)

1.2 (1.2)

6.0 (6.0)

6.0 (6.0)

6.0 (6.0)

6.0(6.0)

6.0(6.0)

6.0(5.9)

0.3 (0.3)

6.0 (6.0)

6.1(6.0)

0 (0)

~(~)

6.0 (5.9)

6.0(6.0)

6.0(6.0)

6.0 (6.0)

0(10.1)

12.1(12.1)

6.0(5.9)

~(~)

0.3 (0.4)

0(10.1)

0(10.1)

4.8(0)

0(0)

0(0)

0(0)

0(0)

0(2.4)

0(0)

6.0(6.0)

6.0(6.0)

6.0(6.0)

0(0)

6.0(6.0)

3.5 (3.5)

0(4.7)

2.3(2.3)

6.0(6.0)

1.2(1.2)

6.0(6.0)

12.1(12.1)

6.0(6.0)

2.3
(2.3)

0(0)

0(0)

0(0)

0(0)

4.6(4.6)

4.8(0)

0(4.7)

4.8 (4.8)

4.7
(4.7)

4.3(4.3)

4.8(4.8)

4.7(4.7)

5.5(5.5)

5.5(5.5)

0(6.0)

0(0)

0(7.8)

0(7.8)

0(0.1)

0(0.1)

0
(0.1)

0 (0.1)

4.7(4.7)

0(0)

0(0)

0(0)

0(0)

0(0)

0(0)

0(0)

0(4.6)

0(0)

9.9(0)

0 (3.9)

0
(3.9)

0(3.3)

0(8.5)

0(8.5)

19.4(19.1)

~(~)

~(~)

2.0(2.0)

0(0)

0(0)

0.5(0.5)

0.7(0.7)

0.4

(0.6)

0(0)

0(0)

0(0)

12.1

(12.1)

0.7 (0.7)

0.5 (0.5)

2.0(2.0)

~(~)

~(~)

11.4
(11.3)

4.2
(4.2)

3.7
(3.7)

0(0)

0(0)

0(0)

0(0)

-0.1
(0)

0(0)

0(0)

0(0)

0(0)

7.0
(7.1)

12.6
(12.6)

12.6
(12.6)

12.1(12.1)

12.1(12.1) 19.4(19.2)

19.4(19.2)

19.4
(19.1)

19.4
(19.1)

19.4
(19.1)

19.4(19.1)

1.6(1.6)

AC3.2

AC24.7

AC16.9

19.4
(19.1)

5.5(5.5)

0.6(0.6)

19.2(19.0)

4.2(4.2)

3.5(3.5)

-15.7

-16.8(-16.8)

-22.2
(-22.2)

-22.8
(-22.8)

0(0)

0(0)

0(0)

0(0)

0(0)

0.5(0)

0.5(0)

-28.7
(-28.5)

-28.8
(-28.6)

-15.7

-16.3

-16.3

-16.3

- 16.3

TAPE SPEED ADJ.

PLAYBACK
LEVEL ADJ. (R ch)

PLAYBACK (L ch)

PLAYBACK LEVEL
ADJ. (L ch)

RECORDING LEVEL ADJ. (L ch)

RECORDING
LEVEL ADJ. (R ch)

RECORDING BIAS ADJ. (L ch)

RECORDING BIAS ADJ. (R ch)

RECORDING (R ch)

M

8

M

7

M

9

D

7

D

2

D

8

w

q

w

e

REC/PB CONTROL

PB AMP.

DOLBY B-C NR

REC AMP.

BIAS OSC

BIAS ON/OFF

METER
DRIVER

POWER SUPPLY

LOADING CONTROL

OPERATION SW

FL DISPLAY

SYSTEM CONTROL

1

2

3

4

5

6

7

8

9

10

11

12

13

1. R

•

REC

2. METAL

3. F

•

REC

4. CASS IN

5. C

rO2

6. +SOL

7. SENSOR OUT

8. +5V SENSOR

9. PLAY SW

10. +MTR

11. –COM

12. MTR SPEED B

13. MTR SPEED A

MAIN PCB

–

+

B
A

MABUCHI

MTR

MECHA CHASSISPH TYPE (JST)

SOL

1

2

3

4

5

1. LOAD OUT (+)

2. LOAD IN (+)

3. LOAD OUT

4. COM

5. LOAD IN

LOADING PCB

PH TYPE (JST)

MTR

+

1. Lch

R / P HD

PH CONNECTOR

–

+

–

+

L

R

E HD

+

2. Lch

–

3. Rch

–

4. Rch

+

5. E

–

6. E

+

CASSETTE MECHANISM

CB2

CB1

CB3

LOADING PCB

MAIN PCB

CB2

CB3

CB1

M38B57M6-143FP

IJKLMN

KX-E300

■ SCHEMATIC DIAGRAM

1

2

3

4

5

6

7

8

9

10

Point q (Both end of C105) REC mode

V : 20V/div H : 5 µsec/div

DC range 1 : 1 probe

0V

Point w

CH1 : Pin 10 of IC205

CH2 : OUT of IC103

V : 2V/div (CH1) V : 5V/div (CH2)

H : 0.5 sec/div DC range 1 : 1 probe

CH 1

CH 2

Point e (Pin 15 of C205) REC mode

V : 2V/div H : 0.1 µsec/div

DC range 1 : 1 probe

0V

*

AC POWER ON*AC POWER OFF

* All voltage are measured with a 10MΩ/V DC electric volt meter.
* Components having special characteristics are marked Z and must be

replaced with parts having specifications equal to those originally installed.

* Schematic diagram is subject to change without notice.

● 電圧は、内部抵抗10MΩの電圧計で測定したものです。

● Z印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、パーツリストに
記載されている部品を使用してください。

● 本回路図は、標準回路図です。改良のため予告なく変更することがございます。

21