1 2 3 4 5 6 7 8

26dB 32dB 0.775V

C105 47p C103 47p -15V

4
R314 2k37

R313 6k19
2 EC104

R312 NU
R308 R103 R101 R104 R112 SW101A R114
10k 220k 1 R113 1
2 3 IC2A 100k
10k 22K 47u/16v
10K 3 NJM4558
22K
R120 C108

8
5 IC301B 5 IC1B C107 +15V 103/63v
R307 7 R102 7
D 6 6
GAIN 1K 47P
D

5
NJM4558 NJM4558
10k 10K
SW301B
C106 47p C104 47p C110

6
-15V 123

4
R104 10k R105 22k 6 IC101B

5
R106 2 7
7k5 R116 R117
1 3 1 6 4 5
3 IC101A 68K NJM4558
IC3A R107 100R VR101A 100k VR101B
EC101

8
LM13600 3 R115 NJM4558 500KC 500KC

8
22K C111

5
R111 39k C115 +15V R119 1K
2 123
+15V 47P R118
10u/50v
2

R108 100R * Filter * 1K

1
4
3
LK-102 G

7
R103
LX1603 EC102
1

10k
10u/50v

CON101 EC105
R121
EC103 Amp_in 1
R110 Gnd 2 1k
2

R109 47u/16v C2 R8
LK-101 G
3 150k
820R Lim 3 47p +15v TO_Tran
100u/25v HEADER 3 SW1D16 Br 100R/1W
LX1602 C102 C101 R7 Z1

2
EC2 BR1
1

22k EC4 CON2

C 470p 470p 15 14 St 15v/1w C
470u/25v
1000u/25v 3
-15v
TR101 13
1 3
2
Pa
2SA1015 -15V
CON1 SV86020F-0403 EC5 EC3 1
R316 10K
L/Lim Z2

4
1 470u/25v W06M 3PHA

4
** CHANNEL_L ** CON4-1 CON4 2
R/Lim
L1
SW1A1 Br IC4A 2
R6 15v/1w
R91000u/25v
3 1 22k
A C3 GND -15v
7 7 4 2 3 St 3 100R/1W
104/50v L2
6 6 5 NJM4558
R2
15V+ 5 5 +15V -15V 6 4 Pa

8
GND
4 4 7 SV86020F-0403
R1 P-C2

P8 250Pin
15V- 3 3 -15V B C5 8 +15V
St P-R1 MEF-684/250V

TO_Tran
D3

SCR138 RT4

SCR138 RT5
2 2 104/50v 9 P7 250Pin
Pa 12 SW1C
1 1 10
+15V Br EC1
11 560R/2W 1N4007

1
CON7 CON7 B+ 10 11 47u/16v P6 250Pin

4
** CHANNEL_R ** 12
R4 EC6 D2 D1 P-C1 L
HEADER 12 9 C1 47p 100u/100v P5 250Pin

SCR138 RT1

RT2

RT3
R315 10K 1N4007 1N4007

2
SV86020F-0403 R5 33k MEF-474/250v
TR201 R3 22k
EC202 1k P1 250Pin
2

10u/50v 2SA1015 Br 5 SW1B

SCR138

SCR138
3 Relay1 P2 N
LK-202 G CON201
7 6 832A-1A-C/48v~DC P4 P3 250Pin
St 250Pin
LX1603 250Pin
Lim 3 IC4B 6
1

R210 Gnd 2 Pa 8 7
820R R1 22k
EC201 Amp_in 1 5
SV86020F-0403
10u/50v NJM4558
HEADER 3
B B
EC203 R203 EC205 R2 22k
10k R221
R209
2

IC3B
150k A LM13600 1k
LK-201 3 100u/25v
G 47u/16v
LX1602
10

13 R208 100R
1

16

C202 C201
6

470p 470p R211 39k EC204

15
+15V 6 47u/16v
-15v R212 SW201A R214
R207 100R 1 R213 7
14
11
12

2 5 IC2B 100k
22K
9

3 NJM4558
22K
R220 C208
B C207 103/63v
R206 1K 47P
7k5
C302 47p C204 47p

R303 R202 26dB 32dB 0.775V

R302 10k R205 22k C210
R309 2k37

R310 6k19

10k 10k
R311 NU

C306 -15V 123

4

6 IC201B

5
15V- -15V PG1 PG2
2 7
4

104/50v 1
R216 3 1 R217 6 4 5
2 2 IC1A
IC301A
1 1
3 IC201A 68K NJM4558
R304 VR201A 100k VR201B
3
R201 3 R215 NJM4558 PINB PINB
500KC 500KC
8

NJM4558 NJM4558 22K C211

10k 10K +15V R219 1K
4

A C215 123 A
8

15V+ C305 +15V R218

47P
104/50v
SW301A
* Filter * 1K

C301 47p C203 47p Title

3

KEP-7000 & 8000 Pre Board

R301 10k R204 220k
Size Number Revision
GAIN A3
Date: 5-Nov-2014 Sheet of
File: H:\Allen\KEP-7000\KEP-7000_Amp\KEP-7000_Amp.DDB
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