KGC-4042A
2001-8 PRINTED IN JAPAN
B51-7838-00 (4) 3395
GRAPHIC EQUALIZER
SERVICE MANUAL
C
Knob (FAD)
(K29-5541-08)
Trim plate
(A21-0474-03)
Screw set
(N99-1543-08)
Bracket
(J21-3693-04)
Power connection cord
(E30-3654-08)
RCA pin cord (IN)
(E30-3646-08)
RCA pin cord (OUT, F)
(E30-3647-08)
RCA pin cord (OUT, R)
(E30-3648-08)
RCA pin cord (OUT, SUB)
(E30-3649-08)
Metallic cabinet
(A01-2568-08)
RCA pin cap
(F29-0049-05)
Knob (SUB)
(K24-0710-08)
Knob (EQ)
(K24-0700-08)
Panel ass'y
(A64-0071-08)
REVISED S/No. 10700001~
2
K
G
C-4042A
BLOCK
DIAGRAM
Lch
Rch
INPUT
ISO
IC4
NJM2060M
UPC4570G2
EQ
IC5
SW1
Lch
EQ
B.P.F
Rch
EQ
B.P.F
2SC2712
Q201-205
Q251-255
2SC2712
SW3
(OR)
LAMP3,4
LED1-5
LAMP1,2
(GR)
EQ
POWER
Q5
Q4
Q3 2SC2060
DTA114ES
DTC114ES
SUPPLY
2SC1741A
2SC4640
Q1
Q2
ACC
GND
P. C
MUTE
DRIVE
2SA1782
Q6,7
FILTER
H.P.
SWITCHING
TR
LED6,7
A.M.P
BUFFER
SW2
WOOFER
SUB
MUTE
FILTER
L.P.
NJM2068MD
IC3
2SC3327-A
Q8,9
MUTE
NJM2068MD
IC2
2SC3327-A
Q10,11
TR
2SC3327-A
Q12
Rch
Lch
SUB
Lch
Rch
REAR
Rch
Lch
FRONT
ON
OFF
+B
OFF
ON
30~150Hz
PRE. GND
METER LED SUPPLY
B
C
A
D
E
F
G
H
I
J
2
4
3
5
6
7
1
3
4
PC BOARD (Foil side view)
Refer to the schematic diagram for the values of resistors and capacitors.
PC BOARD (Component side view)
ELECTRIC UNIT
ELECTRIC UNIT
C2
C52
C3
C53
C4
C54
C5
C55
C96
C97
C11
C61
C12
C13
C14
C62
C63
C64
C16
C66
C81
C82
C83
C84
C88
C85
C86
C87
C89
R91
R92
R104
R105
R106
R93
C90
C93
C95
C94
C98
LAMP1
LAMP2
LAMP3
LAMP4
R108
C203
C253
C202
C252
C204
C254
C206
C256
OR
GR
(FRONT)
(REAR)
(SUB.W)
B
E
B
E
B
E
B
E
BE
B
E
B
E
BE
BE
+B
GND
P
.CON
A
B
C
DE
A
FR
G1
4
9
9
1
EB
VR1
E
B
EB
1
1
6
1
16
16
2 1
4
1
4
1
4
1
14
CN1
CN2
CN3
CN4
CN14
CD14A
SW2
SW1
CN15
D1
Q3
Q4
Q5
D4
D2
D3
D5
D6
Q6
Q7
D7
Q1
Q2
Q12
Q10
Q11
SW3
CN10
CN11
CN12
Q8
Q9
CN9
CN13
EQ ON
SUB
EQ ON/OFF PWB
MAIN PWB
R54
R53
R55
R5
R3
R4
R203
R253
R21
R201
R204
R202
R1
C1
C100
C51
R51
C101
R101
R102
R252
R251
R71
R103
R254
R85
R86
R67
R17
R100
R10
R60
R270
R271
R267
R268
R264
R265
R261
R262
R269
C261
R266
C259
R263
C257
R260
C255
R257
R97
R258
R259
R94
C92
R96
R124
R14
R64
R222
R205
R219
R206
C21
1
R220
R221
R217
R218
R214
R215
R21
1
R212
R208
R216
C209
R213
C207
R210
C205
R207
R209
R59
R62
R20
R12
R9
R107
R84
R82
R81
R87
C150
R7
R6
R8
R57
R56
R58
R88
R89
R256
R99
R98
C258
C260
R63
C91
R95
R272
R255
C210 C208
R90
R16
R15
R18
R19
R61
C65
R70
R69
R68
R65
R66
R11
C15
R83
R150
R13
B
EB
E
B
E
B
E
B
E
B
E
B
EB
E
B
E
B
E
17
8
14
1
4
8
5
14
5
8
5
8
4
1
1
4
58
IC2
IC1
IC4
IC5
IC3
Q255
Q254
Q252
Q253
Q251
Q202
Q204
Q205
Q203
Q201
MAIN PWB
EQ ON/OFF PWB
Refer to the schematic diagram for the values of resistors and capacitors.
Ref. No.
Address
Q1
3B
Q2
3B
Q3
3C
Q4
3C
Q5
3C
Q6
4C
Ref. No.
Address
Q7
3B
Q8
4D
Q9
5D
Q10
4B
Q11
4B
Q12
3C
Ref. No.
Address
IC1
3I
IC2
4I
IC3
4H
IC4
3G
IC5
4I
Ref. No.
Address
Q201
5J
Q202
5J
Q203
5J
Q204
5J
Q205
5J
Q251
4G
Q252
4G
Q253
4G
Q254
4G
Q255
4G
B
C
D
E
F
G
H
I
J
A
2
4
3
5
6
7
1
KGC-4042A
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended
parts (refer to parts list).
Indicates safety critical components. To reduce the risk of electric shock, leakage-
current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the
supply circuit) before the appliance is returned to the customer.
·DC voltages are as measured with a high impedance voltmeter.
Values may vary slightly due to variations between individual
instruments or/and units.
CN4
IC4(1/4)
IC4(2/4)
IC4(3/4)
IC4(4/4)
Q201
Q202
Q203
Q204
Q205
IC5(1/2)
Q251
Q252
Q253
Q254
Q255
IC5(2/2)
SW2
SW3
LAMP
EQ
IC2(1/2)
IC2(2/2)
Q8
Q9
CN1
CN2
CN3
Q11
Q10
Q12
IC3(1/2)
IC3(2/2)
SW1
CN14
CD14A
Q1
Q2
D1
D2
Q3
Q4
Q5
D4
D6
D5
D7
D3
IC1(1/2)
CN9
CN10
CN11
CN12
CN13
LED1
LED2
LED5
LED4
LED3
LED7
LED6
ISO
BUFF
BUFF
BUFF
BUFF
MUTE
MUTE
HPF SW
EQ AMP
EQ AMP
1/2 VCC
Q7
Q6
LAMP/
DRV
LED
SUBWOOFER
FREQ.
SUBWOOFER
LEVEL
L
R
FRONT
REAR
R
L
SUB
R
L
L
R
INPUT
IC1
: NJM4580MD
IC2,3
: NJM2068MD
IC4
: NJM2060M
IC5
: UPC4570G2
Q1 : 2SC4640(T.U)
Q2 : 2SC1741A(R)
Q3 : 2SC2060
Q4 : DTA114ES
Q5
: DTC114ES
Q6,7
: 2SA1782(T.U)
Q8-12
: 2SC3327-A
Q201-205,251-255
: 2SC2712(GR)
D1,2
: DSK10C-ET1
D3
: MTZJ4.3A
D4-6
: 1SS133
D7
: MTZJ5.1B
LED1-5
: AY3802K
LED6,7
: PY3822K
CN15
SUB
50
200
800
3.2K
12.8K
50
12.8K
800
200
3.2K
B LINE
GND LINE
SIGNAL LINE
4
3
2
1
470P
C1
1K
R1
100u25
+
C3
4.7u50
+
C2
10K
R21
1K
R51
+
4.7u50
C52
+
100u25
C53
C51
470P
R71
10K
0.1
C101
0.1
C100
10
9
4
8
13
12
14
1.5K
R202
1.5K
R201
1.5K
R204
R203 1.5K
6
5
7
2
3
1.5K
R252
1
11
1.5K
R251
1.5K
R254
R253 1.5K
C96 220u10
+
C97 10u50
+
R207
180
R208
2.2K
R209
33K
0.33
C203
4.7u50
C202
+
13
R212
33K
R21
1
2.2K
R210
150
0.1
C205
C204
+
1u50
14
R218
39K
R217
4.7K
R214
4.7K
R215
39K
R213
560
3900P
C207
R216
560
C209
1000P
C206
+
0.47u50
15
C208
0.1
16
R221
33K
R220
4.7K
R219
680
270P
C21
1
0.033
C210
21
3
2
8
1
22u25
+
4.7K
R205
10u50
+
150K
R222
11
12
4.7K
R206
4.7u50
C252
C254
1u50
C256
0.47u50
C258
C260
0.33
R258
2.2K
R257
180
C253
R259
33K
R261
2.2K
R260
150
C255
0.1
R265
39K
R262
33K
R264
4.7K
R263
560
3900P
C257
R269
680
R270
4.7K
R268
39K
R267
4.7K
1000P
R266
560
C259
R271
33K
C261
270P
150K
R272
10u50
+
R255
4.7K
22u25
+
4.7K
+
31
1
+
22
23
6
5
R256
7
4
+
24
0.1
25
0.033
26
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
22u25
+
C61
C11
+
22u25
R3 10K
R5 100K
R4 10K
R54 10K
R55 100K
R53 10K
(GR)
(OR)
(OR)
(GR)
15
A
R91
11
0
11
0
R92
E
C
BD
ON
C5
C4
C55
1u50
+
C12
270K
R7
R6
3K
30K
R8
0.1u50
+
C13
1u50
+
C14
10K
R10
R20
270K
2
3
8
1
C15 2200P
R11 1.5K
1u50
C62
R61 1.5K
30K
R57
270K
R56
3K
R58
C63
++
270K
R60
10K
R70
1u50
+
C64
5
6
4
7
C65 2200P
0.1u50
R67
33K
R17
33K
560
R13
22u25
+
C16
22K
R12
10K
R14
22u25
C66
+
R63
560
22K
R62
R64
10K
1K
R15
1K
R16
(1/2)
VR1
R18
11
K
R19
11
K
1K
(2/2)
VR1
R66
1K
R65
11
K
R68
R69
11
K
4
3
2
1
3
1
2
4
2
1
3
4
470
R150
0.01
C150
R103
10K
R101
22K
560
R102
10u50
C95
+
2
3
4
1
R99
R98
3.3K
R100
0.47u50
+
C93
0.22u50
C94
+
3.3K
R97
R95
100K
R124
1K
R96
6
5
8
7
470P
C92
100K
100K
6.8K
C91
3300P
C90
1u50
+
220
R84
22u25
+
10K
4.7K
R81
1
2
3
470u16
C82
+
0.047
C81
0.022
C83
R82
2.2K
R83
47u16
C84
+
330u25
+
C88
1K
10K
R85
R86
4.7K
R107
R89
10
3.8K
R90
R88
47K
R87
33u50
+
C89
470u16
C86
+
1000u16
+
18K
R84
C85
5
6
8
7
100u25
C87
+
2
1
1
2
3456
1
2
3456
1
2
3
4
5
6
1
2
34
14
1
13
12
11
21
16
15
25
26
22
23
24
31
470
R104 820
R93
R105
1.5K
34
35
36
34
35
36
44
41
42
44
41
42
2
5
4
3
6
4
2
3
5
6
15K(B)
VR2(6/7)
15K(B)
VR2(6/7)
20K(B)
VR2(7/7)
150Hz
30Hz
ON
Q12
Q8,9
IC4
VR2(6/7)
VR2(7/7)
GND
BATT
P. CON
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
LAMP1
LAMP2
LAMP4
LAMP3
GR
OR
1.5K
R106
F
R
FADER
LH: ON
+B
R108
C98
C54
VR2(1/7)
VR2(2/7)
VR2(3/7)
VR2(4/7)
VR2(5/7)
R9
R59
1.5K
1.5K
120K
+B
+B
+B
+B
+B
+B
+B
+B
+B
G1
KGC-4042A
3.4V
3.4V
12.6V
3.4V
3.4V
3.4V
3.4V
3.4V
3.4V
3.4V
0V
3.4V
3.3V
12.6V
2.7V
12.6V
5.0V
4.0V
3.4V
5.0V
4.0V
3.4V
0V
12.6V
3.4V
3.4V
3.4V
3.4V
3.4V
3.4V
0V
3.6V
12.6V
3.4V
3.4V
0V
3.6V
3.6V
3.6V
0.7V
0.7V
1.4V
14.4V
13.5V
14.4V
14.4V
0V
14.2V
14.4V
0V
10.0V
13.6V
0V
8.9V
13.6V
12.6V
3.4V
3.4V
3.4V
10K
10K
10K
10K
E
C
B
2SC1741A(R)
2SC2060
DTA114ES
DTC114ES
E
C
B
B
E
C
2SC2712(GR)
1
4
NJM2068MD
UPC4570G2
5
8
1
7
8
NJM2060M
14
KGC-4042A
7
EXPLODED VIEW
B
3
1
A
FADER
SUB
EQ.
ILLUM
A
D
C
C
B
D
B
50
200
800
3.2K
12.8K
FREQ
LEVEL
B
B
A
B
C
D
2.6x5 (F-Tap) BLK
3x5 (Bi-Tap) BLK
3x4 (Bi-Tap)
3x4.5 RIVET
: N85-2605-45
: N86-3005-45
: N09-2630-08
: N29-0053-05
24x2
28x7
30
23
27
25
20
18
17
16
15
22
F1
26
23
4
1
3
VR2-1
VR1
SW1
SW2
SW3
VR2-2 VR2-3 VR2-4 VR2-5 VR2-6 VR2-7
LED1
LAMP4
LAMP2
LAMP1
LAMP3
LED2 LED3 LED4 LED5 LED6 LED7
A
2
Parts with exploded view numbers larger than 700 are not supplied.
724
705
706
704
723
721
731
722
702