1 2 3 4 5 6 7 8

+3VA L2 BLM21P600SG
C2
R26 C51
10uF/16V
R11 2.7k 470
C49 47pF
100uF/16V
INPUT JACK PCB R12
C35
IC3
R21 R53
1.2k 1 16 C10 0.1uF
NU RIN ROUT 1.8k 10k
C47 2 15NC AGND
LIN LOUT
J1 CN1 10uF/16V 3 14 C9 0.1uF AGND +15V C12
FB1
1
1
NC C61
AGND C8 4
VSS
VA
VCOM
PDN
13 SYS_RES
SYS_RES 0.1uF To POWER PCB

2
2 AGND 10uF/16V 0.1uF 5 12 64FS
FB-M 2 VD BCLK 64FS
3 WD5 3 1 AGND 6 11 256FS 8
3
DA204K
R88 3.3k R27 470 C34 7
DEMO0
DEMO1
MCLK
LRCLK
10 1FS
256FS
1FS
2 AGND
R2 C33 MASTER
EH-3 NU 8 9 SO2 C50 1
PHONEJACK STEREO SW C65 R89 SDTO SDTI SO2
WD6 1 3 3 IC2A 3 6 CN3
0.1uF 12k R28 R29 1k
DA204K AK4552VT 10uF/16V 7 1
D ceramic 0 NU 1uF/50V R32 NJM4556M 1 D
AGND SI2 4 2 5 2

2
SI2 C52 2
Shassis GND KLM-2463 NC 100k C11
C4 VR1
IC2B
22pF
3
3
+15V C6 C31 +3VD 0.1uF R55 NJM4556M 4
0.1uF 10pF 0.001uF 10kB 100k 4
+15V AGND -15V 1 5
5
L1 AGND 6
R18 47k 6

1
8 AGND DGND 7
WD1 BLM21P600SG 7
2 AGND C32 C7 AGND 8
DA204K R19 8
CN2 1 6 C46 0.1uF 9
R1 9
1 2 3 7 220uF/16V
1 15k
2 IC1A 10uF/16V 5 AGND EH-9
2 10k Q1
3 C1 4 UPC4570G2
3 R13 KTA2014 R22 1k Q2
0.1uF C30 IC1B AGND
EH-3 1M 10pF UPC4570G2 KTC2875 FOOT_SW_R

3
FOOT_SW_R

1
-15V WD3 R33
R86 -15V C5 AGND DA204K 100k
0.1uF +3VA PHONE_DT
0 PHONE_DT
2 A/AB
A/AB
RES_FRQ
R54 RES_FRQ
AGND 22k AGND FOOT_SW_L
FOOT_SW_L
C70

3
AGND
0.01uF

C48 C71
C3
10uF/16V 100uF/6.3V 0.01uF
V_VOL
V_VOL
10kB(11click)

10kB(11click)
EFFECT TYPE

VR4 VR5 VR6 VR9

VR3

FX DEPTH

VR7 VR8 AGND AGND

VR2
AMP TYPE

10kB 10kB 10kB 10kB 10kB 10kB DGND

MIDDLE

LEVEL
3 3 3 3 3 3 3 3

TREBLE

BASS
GAIN
C63
2 2 2 2 2 2 2 2
0.1uF
+3VD

1 1 1 1 1 1 1 1

R17
100k
G_VOL
G_VOL
C FOOT_SW_R +3VD C
FOOT_SW_R
R3 R4 R5 R6 R7 R8 R9 R10
1k 1k 1k 1k 1k 1k 1k 1k R35 TP1
100k TP
IC5 IC6
2 NC 1
NC A14
FOOT_SW_L M_CLK 74 3 26
FOOT_SW_L M_CLK CLKIN DA13 A13
73 4 2
R64 PHONE_DT CLKOUT DA12 A12
PHONE_DT 5 23
DA11 A11
+3VD DSP_RES 87 6 21
100 DSP_RES RESET DA10 A10
7 24
DA9 A9
+3VD 88 8 25
R36 R78 INT4/WAKEUP DA8 A8
C44 89 9 3 19 DD7
100k 47k INT3 DA7 A7 D7
0.01uF 4FS 90 10 4 18 DD6
4FS INT2 DA6 A6 D6
C36 C37 C38 C39 C40 C41 C42 C43 1FS 91 11 5 17 DD5
R56 1FS INT1 DA5 A5 D5
0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF IC4 F_OE 12 6 16 DD4
F_OE DA4 A4 D4
45 44 100 13 7 15 DD3
P03/AN11 P04/AN12 NC DA3 A3 D3
46 43 DGND +3VD 49 14 8 13 DD2
NC P02/AN10 P05/AN13 R79 47k NC DA2 A2 D2
+3VD 47 42 HRE 52 15 9 12 DD1
NC P01/AN9 P04/AN14 P3 DA1 A1 D1
48 41 HWE R80 47k 53 16 10 11 DD0
NC P00/AN8 P07/AN15 P2 DA0 A0 D0
60 49 HA0 R83 47k 54 +3VD
R37 R38 R39 R40 R16 R20 P67/AN7 P37/S-RDY3 P1
61 50 HCS R84 47k 55 28
10k 10k 10k 10k 10k 10k P66/AN6 P36/S-CLK3 P0 Vcc
62 51 HRD 17 DD7
P65/AN5 P35/TxD3 D15
63 52 HWR DGND 18 DD6 27 C19
P64/AN4 P34/RxD3 D14 WE
64 19 DD5 22 0.1uF
P63/AN3 D13 OE
1 4 56 20 DD4 20 14
P62/AN2 P57/INT3 HD7 D12 CS GND
2 5 57 21 DD3
P61/AN1 P56/PWM HD6 D11
3 6 58 22 DD2
P60/AN0 P55/CNTR1 HD5 D10
7 59 23 DD1 DGND DGND
P54/CNTR0 HD4 D9
33 8 60 24 DD0 UPD43256BGU-B12(SRAM256Kbit)
P17 P53/S-RDY2 HD3 D8 100k
34 9 61 27 R42
P16 P52/S-CLK2 HD2 D7
35 10 62 28 R43 100k
P15 P51/S-OUT2 HD1 D6
PRESET SW1
MANUALSW2 CH SELECT SW3 WRITE SW4 TAP SW5
FX BYPASS SW6
36
P14 P50/S-IN2
11 63
HD0 D5
29 R44 100k
37 100k +3VD 30 R48 100k
PUSH SW PUSH SW PUSH SW PUSH SW PUSH SW PUSH SW P13 R41 D4
38 21 DSP_RES C15 31 R45 100k
P12 P40/INT40/XCOUT DSP_RES 0.1uF D3
39 20 32 R46 100k
P11/INT01 P41/INT00/XCIN NC D2
40 17 IC8 HRE 66 33 R49 100k
P10/INT41 P42/INT1 HRE D1
16 NC 1 8 NC HWE 67 34 R47 100k
R59 100 P43/INT2 NC NC HWE D0
+3VD DGND RES_FRQ 56 15 RXD 2 7 HCS 68
RES_FRQ P30/DA1 P44/RxD1 RXD VCC GND HCS
B A/AB 55 14 TXD 3 6 HRD 69 B
DGND A/AB P31/DA2 P45/TxD1 TXD CS DO HRD
54 13 4 5 HWR 70 94 NC +3VD DGND
LED1 LED3 LED4 LED6 R63 100 NC 53 P32 P46/S-CLK1 SK DI HWR BSTB
LED2 LED5 12 DGND HA0 71 95
RED(3mm) RED(3mm) NC P33 P47/S-RDY1/CNTR2 HA0 NU
RED(3mm) RED(3mm) RED(3mm) RED(3mm) AK93C45AF 72 96
SYS_RES HA1 MWR
25 19 SYS_RES DGND 97
NC P27(LED7) RESET C64 MRD
26 23 NC +3VD 98 NC
PRESET MANUAL CH1 CH2 TAP FX BYPASS R34 100 NC 27 P26(LED6)
P25(LED5)
XOUT
XIN
22 M_CLK
0.1uF
M_CLK
R81
47k
92
HOLDRQ
I.C.
X/Y
99
R60 100 28 58 93
P24(LED4) Vref R65 100 NC HOLDAK
R57 100 29 57 F_SCK
P23(LED3) Vcc F_SCK
R61 100 30 24 CN4 IC9 +3VD
P22(LED2) Vss C14 R66 100
R58 100 31 59 F_BUSY 1 79 35 2.5V 5 1
P21(LED1) AVss 0.1uF DGND F_BUSY 1 TDO IVdd V
VOUT
OUT VIN
V IN
R62 100 32 18 2 80 77 2 C20
P20(LED0) CNVss 2 TICE IVdd VSS
GND
+3VD 3 81 85 4 3 0.1uF
R90 3 TCK IVdd NS
NCBP CONTROL
CE
+3VD +3VD M3803 DGND 4 82
4 TDI NJM2872AF
5 83 +3VD C16 C17 C18
10(1/8W) 5 TMS C72
+3VD C45 C62 C13 6 84 25 0.1uF 0.1uF 0.1uF DGND
R30 R31 R24 6 TRST EVdd 0.1uF
0.01uF 0.1uF V_VOL 50
NU NU 10k 47uF/6.3V V_VOL EH-6 EVdd
R82 64
R23 R85 EVdd
DGND 75
From POWER PCB 10k IC7 12k R91 0
47k
37
SI1
EVdd
EVdd
100 DGND
8 1 G_VOL 38
NC NC NC NC R69 G_VOL SIEN1
7 2 DGND F_VPP DGND 39 C24 C25 C26 C27 C28
POW IN F_VPP SCK1
CN5 +15V SYS_RES 6 3 NC 100 40 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
SYS_RES OUT NC NC SIAK1
1 5 4 F_SYS_RES 41 1
1 C59 R50 R51 C GND R25 F_SYS_RES NC SO1 GND
2 42 26
2 100uF/25V 100k 100k C22 10k NC SORQ1 GND
3 M51957BFP 43 36
3 C60 1uF/50V SOEN1 GND
4 4FS 44 51 +3VD CN6
4 100uF/25V 4FS 100 SOEN2 GND
5 SO2 R75 45 65
5 NC SO2 SO2 GND 1
6 AGND 64FS 46 76 C29
6 64FS SCK2 GND NC 2
7 -15V DGND DGND DGND 47 78 0.1uF F_SYS_RES
7 SIEN2 GND F_SYS_RES 3
8 SI2 48 86 F_VPP
8 100 SI2 SI2 GND F_VPP 4
C68 R71 256FS F_BUSY
256FS R52 F_BUSY 5
EH-8 0.1uF IC10B UPD77112 DGND F_OE
IC10E 100k F_OE 6
IC11 DGND F_SCK
R14 1M R93 R15 1M F_SCK R76 7
11 10 M_CLK 3 4 10 9 DGND RXD 100
M_CLK CLK Q1 NC RXD R77 100 8
7 R72 100 64FS TXD
100 Q2 64FS TXD 9
IC10F IC10A 6 NC IC10D +3VD
HD74LVU04A HD74LVU04A Q3 10
DGND 13 12 1 2 5 NC 9 8 R70 100 64FS
Q4 IC10C 64FS EH-10
11 3 NC
R67 R68 RESET Q5 HD74LVU04A R74
A +3VD +3VA DGND 2 5 6 100 4FS 14 DGND A
HD74LVU04A 100 HD74LVU04A 100 Q6 4FS
L3 4 NC
R87 Q7 HD74LVU04A
X2 13 R73 100 1FS C23
X1 Q8 1FS IC10 NC : No Connect
+3VD 12 NC 0.1uF
BLM21P600SG C57 4.7(1/8W) C58 Q9
16 14 NC
100uF/6.3V 100uF/6.3V C53 8MHz C54 11.2896MHz VCC Q10 7
C55 C56 C21 15 NC
Q11 NU : No Use
22pF 22pF 0.1uF 8 1 NC
R92 0 22pF 22pF GND Q12
HD74LV4040A HD74LVU04A
C66 C69 DGND AGND C67
DGND DGND DGND DGND DGND DGND Title
0.1uF NU 0.1uF
VOX AD15VT & AD30VT MAIN PCB
Size Number Revision
Shassis GND Shassis GND
A2 KLM-2462, 2463 1.51
Date Sheet of
2004.02.27 1/2

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

C12 C13
0.001uF 47pF ceramic
IC1C POWER BLOCK
DG211
R19 R30 D3 S3
10 11

C3
470k 68k IN3 R70 If the output power is not high enough, please delete both R67 and R68.
0.1uF IC1A 47k
C49
DG211 +3VD 0 : ON

9
R2
R65
1 : OFF
0.22uF/50V Even doing above modify, if the output power is not go to correct level, please exchange the TUBE itself.
1k 2 D1 S1 3
IN1 10k
D D
0 : ON

1
RES_FRQ R64 Q8
1 : OFF
R32
22k C52
R62 KTC3198 0.1uF
22k 330k
C15 +15V ceramic
C2 0.1uF R71 47k_F(1%)
+15V +15V
4.7uF/50V ceramic Q9
KTC3198
R1 C9 8 C26
1k R31 22uF/35V VR1A
2 C53 R14 R15
R35 100kB

1
1 3 1
BP 1uF/50V 330k 3 Max Min
V1A 3.3k 47uF/35V 2.2k C28
C8 IC2A 2.2k +Vcc(+30V)
C1 R20 R23 12AX7 C14 NJM2082D 10uF/35V
2 4 C51

2
100uF/35V R67 R66 C16
220 47k BG C66 C29
1uF/50V R24 16k 220k R63
10pF

3 BK
4 BH
33k -15V 0.1uF 2.2k 3pF ceramic

9 CH
IC1B

5AH
ceramic 6 R25 0.1uF 220uF/35V
DG211 ceramic

1,5
7 10k

1
R5 R6 ceramic
4.7k 4.7k D2 S2 5
15 14 HEATER1
HEATER1 IC3B LM3886
-15V HEATER2 -15V 10 IC4
IN2 HEATER2 NJM2082D
C27 CN2
R44 R48
22uF/35V 3 1
1.8k 1
SP1

16
R41 R42 0.47(3W)
0 : ON ADJUSTMENT RESISTOR 9 2 8ohm
From MAIN PCB 1 : OFF 330 5.6k C32
(Delete=6dB up)
2
10 INCH

8
Q1 47uF/25V R33 VH-2
CN1 C31 KTC3198GR R12

4
R38 Q2 330k R13 22k
1 PRE OUT

7
1 PRE OUT R26 Q3 0
2 KTC3198GR -15V
2 10uF/16V 47k
3 KTC3198 POWER LEVEL
3 2.2k R8 R43 R68
4 C17 C30
4 R39 10k 4.7k 3.3k
5 IC2B C11
5 33k R4 R34
6 AGND NJM2082D 6
6 R36 0.1uF 220uF/35V

8
7 DGND 4.7k 7
7 330k ceramic

AK
8 V1B 5 NU -Vss(-30V)
8 12AX7 3.3k
9 FOOT_SW_R C10 -15V
9 FOOT_SW_R R21 R27 R57 Q5
-15V 7
KTC2874 R45 R29 22k R46
C EH-9 AG C
220 47k 1uF/50V R28 1k 2.2k 10 (1W)
LINE OUT
LINE OUT R3 33k
IC1D AP
C47 NU
DG211

6
4.7k ceramic
C35
PHONE_DT 6 S4 D4 7 +3VD + C33 0.22uF
PHONE_DT Q7 47uF/35V
-15V
IN4 KTA1266

FOOT_SW_L R53

8
FOOT_SW_L 10k
0 : ON
R72
1 : OFF
+3VD IC1 +15V
13 47k_F(1%)
12
VL V+ C5 R60
+3VD
0.1uF 10k VR1B C34 NU
5 ceramic R17 100kB R18
3 1
R7 GND
C4

+
22k Q6 2.2k Max Min 2.2k R58
10uF/16V C6 R16
4 0.1uF KTC3198 +15V 470

2
A/AB R9 Q4 V- ceramic C43
KTA1266 DG211 -15V 0
22k R37 10uF/25V
0:A Vishay Siliconix
1 : AB 100k R59
R40 8 1k
C56 47k C65
2
NU
10uF/16V 1
3
IC3A R73 C54
-15V NJM2082D 47(1W) 100uF/25V
4 FB2
C42
FB-M C55
10uF/25V R61 22pF
POWER SUPPLY BLOCK -15V 47(1W)
C48
100uF/25V
FB1
ceramic
D2 LINE OUT
LINE OUT
+VCC(+30V) 1N4002 +15V
FB-M C46
22pF
ceramic
B PRE OUT B
R49 PRE OUT PHONE / LINE OUT
1 V V 3
3 OUT
IN 1 J2
330(1W) R56
1 GND 2
+3VD +3VD 10k 3
C36 C18 C67 C38 D12
C20 IC5 C22 4
2

0.1uF 100uF/25V 1N4002

2200uF/50V 3.3uF/50V 0.1uF 7815 0.1uF 5
ceramic R22
ceramic ceramic 6
4 10k
D8 PHONE_JACK_SW
2 To MAIN PCB 1N4148
R10
D1 AGND PHONE_DT C63
KBP206G PHONE_DT
IC6 10k 0.1uF ceramic
C68 C39
1

C19 C21 7915 C23 D13

C37 100uF/25V
0.1uF 3.3uF/50V 0.1uF 0.1uF 1N4002 CN3 C57 C58 C59 C60 D9 +3VD
5 C41
2200uF/50V ceramic ceramic GND ceramic 1 0.1uF 0.1uF 0.1uF 0.1uF 1N4148 Shassis GND
POWER R50 1 0.01uF
2 3 2 ceramic ceramic ceramic ceramic
IN OUT 2 ceramic
3 D14
SW1 330(1W) 3 R69
4 1N4148 10k
SW-SPST 4 J1
F1 NC 5 5 FOOT_ SW_R
FOOT_ SW_R
1 2 DGND 6
1 6 Shassis GND Shassis GND FOOT SW
-VSS(-30V) D5 7
FUSE 7 C50
1N4002 -15V 8 D15
8 0.1uF 1N4148
3
EH-8 ceramic PHONE_JACK STEREO
10
D6
C64
Chassis GND 1N4002 Shassis GND +3VD
0.1uF ceramic
2 Shassis GND
+3VD
D10 Shassis GND
R11
1 V V 3 1N4148 10k
6 OUT
IN C61 C62 FOOT_SW_L
FOOT_SW_L
4 GND 0.1uF 0.1uF
C45 ceramic ceramic
C40 C7
C24 IC7 C25 D11
2

2200uF/16V 100uF/6.3V
0.1uF BA033T 0.1uF 0.1uF 1N4148
ceramic
D7 ceramic ceramic
7 SHSW04M R55

0
A R47 10 (1W) A
F2
HEATER1
C44 0.22uF ceramic 8 HEATER1
FUSE R51 R54
D3 1N4002
5
100(1W)
470 POWER NC : No Connect
CN4 CN5
R52
1
1 1
1 NU : No Use
2 2 LED1
D4 1N4002 2 2 RED(5mm)
3 3 Title
100(1W) 3 3
9
HEATER2
HEATER2
EH-3 EH-3
VOX AD30VT POWER PCB
Chassis GND Circuit GND Size Number Revision
A2 KLM-2464 1.61
Date Sheet of
2004.2.6 2/2

1 2 3 4 5 6 7 8