Service Manual
Model: TERMINATOR
DIGITAL AUTO FEEDBACK ELIMINATOR
www.altoproaudio.com
Version: 1.1
CONTENTS
1. Specification
2. Block Diagram
3. Schematic Diagram
4. Printed Circuit Board
5. Wiring Diagram
6. Test Procedure
7. Electrical Parts List
8. Exploded Views & Mechanical Parts List
9. Notes
1. SPECIFICATION (TERMINATOR)
Analog Input section
Inputs: Analog variable gain, 2 XLR-F electronically balanced
Input Impedance: 44 kOhms
Max. input Level: 15 dBu (4.4V RMS)
Sensitivity: -22 dBu (63mV RMS)
Analog Output section
Outputs: Analog variable gain, 2 XLR-M electronically balanced
Output Impedance <150 Ohms
Max. output level: 17 dBu on 600 Ohms (5.5V RMS)
Digital / Analog Interface
Amplitude Response: 20 Hz - 20 kHz + 0.2 / - 2.5 dB
Signal to Noise Ratio 90 dB (A wtg. / 20 Hz-20kHz)
THD+N 0.03 % @ 1kHz -6 dB (VU-meter level)
Group Delay 700 us
Sampling Frequency 46.875 kHz
Conversion 1 bit Sigma-Delta
Digital
Processor Speed: 12 MIPs
DSP Resolution: 24x32bits
Control: Microprocessor
MIDI Section
Connections: Input/Output/Thru
Sockets 5-poles DIN (female)
Mode Photocoupled
Power Supply
Connector type: 3-pole IEC, grounded
Type: Servo controlled, stabilized
Mains supply: 115V or 230V 50/60 Hz
Power Rating: 9 W
User Interface
numeric LCD Display: 2x20 characters
Keyboard: 7 user keys / 5 LEDs
VU meter: 2x6 LEDs
Physical
Size: Standard 19'' rack mounting
Dimensions (W/H/D): 483mm 44mm 232.5mm (19.32'' 1.76'' 9.3'')
Net Weight: 3.8Kg
B
AC 115/230V
C
INPUT
D
8
A
OUTPUT R
7 6 5 4 3 2 1
KEY CONTR OL
S3
OUTPUT L
S4
POWER SUPPLY
VOLTAGE R EGULATOR
+12VA
-12VA
+5VD
LED DISPLAY
LRCKIN =46.875KH Z
BCK=1.500MHZ
OUTPUT LEVEL
OUTPUT LEVEL
OUTPUT BU F FER & AMPLIFIER
( 74HC393 )
LCD DISPLAY
MEMORY (DRAM) DSP
ED0-ED7
EA0-EA9
CLOCK DIVIDE
Q1
12.000MHZ
12.000MHZ
LCD DISPLAY &
KEY CONTR OL & LED DISPLAY
AD0-AD7
MPU
( P87C54UBAA )
SO0 SI0
INTERFACE
( TMS57002DPHA )
AD0-AD7
STEREO AUD IO CODEC
A/D and D/A CONVERTER
( PCM3001E )
IN-R IN-L OUT-R OUT-L
INPUT LEVEL
INPUT LEVEL
INPUT BUF FER & AMPLIFIER
MIDI INTERFACE
MIDI
CONTROL
MIDI IN
MIDI THRU
S1
MIDI OUT
INPUT R
S2
1 2 3 4 5 6 78
INPUT L
D
C
B
A
D
R51
470R
8
+5V
INR
XTAL
LRCKIN
R44
0R0
8
Q011Q110Q29Q3
U15B
74HC393
CLK
MR
13
U15A
BCK
J2 CON10A
R10
1
CLK
74HC393
Q03Q14Q25Q3
XTAL
12
13
11
R8
R11
1 2
3 4
5 6
R15R9R14R7R12
SO1
12
2
MR
6
R41
0R0
8 9
U4D
74F14D
BCK
C8
100nF
Vdasp
STRB
12 13
U4F
74F14D
U5D 74HC32D
R13
R27
R24
7 8
9 10
R29
SI1
LRCKIN
D
7 6 5 4 3 2 1
R16
+5V
INL+INR
C21
J4
1 2
L3
330uH
Vdasp
SI0
SI1
SYNC
80
SI1
79
SI0
78
NC
77
LRCKI
76
BCKI
75
NC
74
VSS
73
VCC
72
NC
71
STRS
70
69
68
67
R/W
66
CS
65
A14
RS-CODEC
P1.4
P1.5
P1.6
P1.7
XTAL
L1
330uH
R1
10R
+5V
RS-CODEC
R35
10R
100nF
28
U13
PCM3001E
VINL1VCC12AGND13VREF L4VREF R5VINR6CINPR7CINNR8CINLN9CINPL10VCOM11VOUT R12AGND213VCC2
C33
10uF
C27
10uF
C40
100nF
C39
1uF/50V
SO0
+5V
2
1
5
4
NC3NC
S006S01
BCK0
SYPOL
LRCK0
CLOAD
DREADY
PLOAD
64
OVM
U4B
1
2
3
4
5
6
7
8
9
22
10
C3
1uF/50V
C1
C5
47/16V
100nF
S1
SGND
JP1
1 2
24
FMT225FMT126FMT027RSTB
C26 10uF
C42
82pF
SO1
9
7
10
CAS8RAS
BIO
AD7
OVFA
74F14D
U3
P87C52UBA A
NC1
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
R2
1K5
D1
BAS16
C
22P
C29
Q1
12.00MHZ
22
21
23
20
VDD
XTO
CLKIO
DGND
C37
470P
C38
C28
10uF
13
14
11
VSS12VSS
CLKIN
CLKSEL
U8
AD5
AD6
3 4
A15
A8A9A10
25
P2.0/A824P2.1/A9
DGND
+5V44P0.0/AD 043P0.1/AD 142P0.2/AD 241P0.3/AD 340P0.4/AD 439P0.5/AD 538P0.6/AD 637P0.7/AD 736XTAL121XTAL2
AD0
AD1
AD0
AD1
O011O112O213O315O416O517O618O7
A010A19A28A37A46A55A64A73A825A924A1021A1123A122A1326A1427CE20OE22VPP
A0A1A2A3A4A5A6A7A8A9A10
C22
LRCKIN
SI0
BCK
SO0
17
19
15
18
DIN
XTI
LRCIN16BCKIN
DOUT
VOUT L
14
C34
10uF
470P
U4E
ED3
ED4
ED5
ED6
ED7
WE
ED715ED616ED517ED418ED319ED220ED1
TMS57002
AD1
AD2
AD3
AD4
A11
A12
A13
A14
A15
31
P2.2/A1026P2.3/A1127P2.4/A1228P2.5/A1329P2.6/A1430P2.7/A15
AD2
AD3
AD4
AD5
AD6
AD2
AD3
AD4
AD5
AD6
C
22P
4K7
R50
R40
1uF
C36
R43
100K
R42
100K
C35
1uF
SGND
10 11
4
5
74F14D
9
10
ED1
ED2
23
22
NC21NC
EA9
AD0
23
34
35
NC3
NC4
EA/VPP
20
AD7
AD7
19
OUTL
U10 HY534256A
SGND
OUTR
HY534256A
U9
U5B
74HC32D
6
8
ED0
U5C
74HC32D
24
ED0
EA0
25
EA0
EA1
26
EA1
NC
27
EA2
28
EA2
NC
29
EA3
30
EA3
EA4
31
EA4
VSS
32
VCC
33
EA5
34
EA5
EA6
35
EA6
NC
36
EA7
37
EA7
TEST0
38
TEST1
39
TEST2
40
EA841EA942NC43NC44D045D146D247D348NC49D450D551VCC52VCC53D654D755PC056BI0570VFA580VFM59RS60NC61NC62EMPTY63MUTE
EA8
R21
R22
0R0
+5V
ALE/PROG
33
PSEN
32
NC2
12
P3.7/RD
19
P3.6/WR
18
P3.5/T1
17
P3.4/T0
16
P3.3/INT1
15
P3.2/INT0
14
P3.1/TXD
13
P3.0/RXD
11
U6A
1
A15
A11
A12
A13
A14
+5V
L2 330uH
Vdasp
/RD
R23
RXD
TXD
10K(OPT)
HT27C512P
R18
B
C41
82pF
ED6
ED7
EA7
EA8
18
25
22
26
23
OE
I/0224I/03
CAS
DGND
I/001I/012WE3RAS4A95A09A110A211A312+5V
ED4
ED5
EA9
EA0
EA1
EA7
EA8 EA0
ED2
ED3
23
26
18
25
22
OE
I/0224I/03
CAS
DGND
I/001I/012WE3RAS4A95A09A110A211A312+5V
ED1
EA9
OVFA
1
3
S2
2
C6
1uF/50V
C9
100nF
U5A
74HC32D
RS
AD0
AD1
AD2
AD3
AD4
AD5
D12D23D34D45D56D67D78D8
19
A0A1A2A3A4A5A6
B
EA1
SW SPDT
3
U4A
AD6
ED0
+5V
1
2
I/O
U7A 74HC574D
EA4
EA5
EA6
A414A515A616A717A8
13
EA2
EA3
EA4
EA5
EA6
A414A515A616A717A8
13
EA2
EA3
P1.7
P1.6
P1.5
P1.4
6
14
A09A17A2
GS
74HC148
01011121231341526374EI
U2A
RS
P1.4
AD0
1 2
3 4
5 6
7 8
9 10
J1 HE A D ER 12X2
I/O
AD1 AD2
AD3 AD4
STRB
U4C
74F14D
5 6
1 2
74F14D
AD7
1
9
11
OC
CLK
Q812Q713Q614Q515Q416Q317Q218Q1
A7
C14
100nF
R30 10R
+5V +5V
11 12
13 14
AD5 AD6
AD7 AD8
U1 24LC64
C24
C25
+5V
U14
D3
BAS16
+15V
C13
100nF
R28
10R
R17
15
EO
5
BIO
15 16
17 18
19 20
21 22
2
S3
SW SPDT
1
3
/RD
+5V
R5
10R
C2
100nF
7
8
NC
VCC
NC1NC2A23GND
1uF/50V
100nF
R38
330R
LM317T(opt)
C30
47/50V
C31
100nF
-12V
+12V
C19
100P
14
+VCC -VCC
GND
1
R19
R31
C16
C12
23 24
1 2
+5V
+5V
1 2
OVM
J0
-12V
R49
R48
C23
C10
R3 100R
R4
C11
100R
6
SDA5SCL
4
A
V2.1
1 1of
KEVIN LIN.
1K
R39
D2
BAS16
C32
47/16V
Revision Model No:
(Copyright S.E.E.D. S.R.L.)
Drawn By:
Sheet
DP BOARD [MK3.1]
20-May-2002
MK3.1.Sch
A3
Titel
Size
File:
Date:
C20
100P
+5V
7
14 7
U12E
U12A
SN75189
1 3
0R0
INL+INR
OUTL
OUTR
9 10
11 12
13 14
R34
2 3
TXD
C4
100nF
R6
10R
R37
10R
R25
10R
R26
10R
R33
10R
R20
10R
A
SN75189
RXD
R47
R45 0R0
2
R36
INR
+12V
L5
0R0
J3
15 16
17 18
19 20
HEAD ER 10X2
R46 0R0
16 8
U2B
74HC148
14 7
U15C
74HC393
14 7
U4G
74F14D
14 7
U5E
74HC32D
28 14
U6B
HT27C512P
20 10
U7B
74HC574D
SGND
L6
0R0
L7
0R0
1 2 3 4 5 6 78
U11E
SN75188
R32
C15
L4
3 4
5 6
7 8
+15V
C18
1uF/50V
U11A
SN75188
100nF
100nF
100nF
C17
100nF
C7
100nF
+5V
D
C
B
A
8
7 6 5 4 3 2 1
+5VD
P1
( TO LCD B/L )
J4
IDC14
( LCD CONNECTOR )
12345678910111213
AD0
AD1
AD2
AD3
AD4
RS_LCD
R18
10K
R36
R3
E_LCD
8 9
U10D
74HC04D
11
U9D
74HC32D
13
10 11
U10E
74HC04D
AD5
R19
330R
C32
100nF
C2
10uF/16V
U9C
74HC32D
9
U9A 74HC 32D
2
12
12 13
U10C
U10F
74HC04D
74HC04D
5 6
RS_LCD
(UTIL)
(EDIT)
(OVM LED)
D2
LEDD3LEDD4LEDD5LED
D1
LED
+5VD
14
DL2
R44
330R
R45
330R
74HC32D
11 12
13 14
15 16
17 18
19 20
21 22
DGND
R60
6
U9B
4
5
U10B
74HC04D
3 4
AD0
1 2
3 4
5 6
7 8
9 10
AD6
AD7
P2
8
10
3
1
(AGC ON)
(BYPASS)
D14
LED
D15
LED
D16
LED
D17
LEDD6LEDD7LEDD8LEDD9LED
DL3
DL4
DL5
DL14
DL15
R59
R58
330R
R57
330R
R46
330R
R47
330R
19
D12D23D34D45D56D67D78D89CLK11OC
U7A
74HC574D
AD0
AD1
INPUT1
J2
IDC20
1 2
3 4
5 6
7 8
9 10
330R
330R
Q812Q713Q614Q515Q416Q317Q218Q1
AD2
AD3
AD4
AD5
AD6
AD7
INPUT2
OUTPUT2
OUTPUT1
11 12
13 14
15 16
17 18
19 20
( TO COUPLES WITH J2 ON MK3 )
AGND DGND
+8VD
JP3
0R0
+5VD
23 24
TXD
C13
12pF
U2B
DL16
RXDM
R14
220K
R13
82K5
R8
0R0
TL074CD
DL6
DL7
DL17
R56
330R
R48
330R
R49
330R
R50
U8A
1
12345
J6
6P-2.5
( Digital stage conneter )
+5VD
OUT2
VR2A
A50K _LOG
1
3
2
7
C14
U2A
TL074
AGND
R9
0R0
D10
LED
DL8
DL9
DL10
330R
R51
330R
R52
330R
19
D12D23D34D45D56D67D78D89CLK11OC
74HC574D
AD0
AD1
AD2
AD3
AD4
AD5
+5VD
6
DGND
TXD
RXDM
AGND
R16
220K
12pF
14
U2D
12
13
R15
82K5
R10
0R0
8
U2C
TL074CD
D11
LED
D12
LED
D13
LED
DGND
C43
100nF
DL11
DL12
DL13
14 7
U9E
330R
R53
R54
330R
R55
330R
Q812Q713Q614Q515Q416Q317Q218Q1
1
AD6
AD7
2002,3,19 MOD. C4,R5
R5
10K
C4
200uF
123
J5
3P-2.5
AGND
( Analog stage connecter )
-12VA
+12VA
OUT1
AGND
VR2B
A50K _LOG
TL074
AGND
R11
0R0
XXX
XXX
XXX
CONTROL30 TERMINATOR ALTOCOMP
OOOOOOO
bVERB
74HC32D
C42
100nF
14 7
U10G
74HC04D
C41
100nF
20 10
U7B
74HC574
C40
+5VD
20 10
DGND
X
X
X
100nF
DGND
U8B
74HC574
123
J9
IN2
IN1
O
O
XXX
X
O
O
X
O
O
XXXX
X
X
J10
3P-2.5
AGND
+5VD
X
XX
+12VA
X
XX
4 11
O
O
+12VA
123
OUT1
OUT2
R4
220R
J1
C7
100nFC8100nF
U1E
C9
100nF
ALTO GROUP2 DIGITAL STAGE
2P-2.5
TL074
G2FP1-LINK
G2FP1-LINK.SCH
3P-2.5
AGND
AGND
1
2
(PW R-ON L ED)
C10
100nF
1 1of
VER020425
KEVIN LIN.
Revision Model No:
Drawn By:
Sheet
Group2 b VERB
20-May-2002
G2FP1.Sch
bVERB KEYBOARD / DISPLAY
A3
Titel
Size
File:
Date:
-12VA AGND
-12VA AGND
5
AD1 AD2
AD3 AD4
AD5 AD6
AD7
R37
10K
10K
R38
10K
R39
R40
10K
10K
R41
10K
R42
+5VD
R43
10K
8
J8
SIP8-2.5
8
J7
SIP8-2.5
S2
S3
S4
S5
UP
DOWN
D
S6
ESC
ENTER
J3
IDC24
( TO J1 OF MK3.1)
C5
47uF/25V
1234567
1234567
S7
EDIT
DGND
S8
UTIL
BYPASS
VR1A
( VR1 : INPUT Volumn Control)
R1
C
6
2
VR3A
1
A10K_LOG
1K
B1K
3
INPUT2
C1
C6
47uF/25V
47uF/25V
1
U1A
TL074
3
2
AGND
VR1B
R2
IN2
9
10
5
VR3B
4
B1K
6
VR3
R8R9R10
R11
R6
R7
C23
C24
C5
C6
4 11
U2E
TL074
ALTO GROUP2 ANALOG STAGE
INPUT1
C3
47uF/25V
7
U1B
TL074
5
6
AGND
A10K_LOG
1K
IN1
B
U1C
R6
8
TL074CD
10
2K2
OUTPUT2
14
U1D
TL074CD
9
AGND
C23
680P
12
13
AGND
C24
680P
R7
2K2
OUTPUT1
A
1 2 3 4 5 6 78
D
C
B
A
S3
OUTPUT2
2
4
4
L6
LF22uH
R25
C27
100uF/25V
14
U2D
12
13
3 2 1
(OUT P U T 1)
(FOR CONTROL30,
BetaVERB,ALTOCOMP)
BAL-MALE
1
3
L5
LF22uH
R24
4K7
C26
100uF/25V
TL074CN
R23
47K
R22
J5
3P-2.5
J4
3P-2.5
4K7
AGND
8
U2C
TL074CN
9
10
7
U2B
TL074CN
5
6
47K
1
2
3
1
2
3
OUTPUT1
2
4
AGND2
L8
LF22uH
AGND
C29
100uF/25V
14
12
13
AGND
(OUT P U T 2)
AGND
J2
AGND
S4
BAL-MALE
AC11V
GND
5P-3.9
1N4002
AC11V
1
2
3
4
5
LINK
MK31PU2LINK .SCH
ST-GND
GND CONNECT
TP1
DGND
STAR THE G ND S
D4
D5
1N4002
1N4002
(OPT)
JR15
D6
1N4002
( CONNECT IN A STAR THE GNDS )
1
3
L7
LF22uH
R26
R27
4K7
C28
100uF/25V
4K7
AGND
AGND2
AGND
J3
D2
D3
1N4002
Revision Model No:
VER020425
1 1of
Sheet
KEVIN LIN.
Drawn By:
ALTO GROUP2(CONTROL30)
8
U1D
TL074CN
R21
47K
1
6P-2.5
( Digital stage conneter )
+5VD
U1C
9
10
7
U1B
5
6
R20
47K
2
3
4
5
6
TXD
RXDM
C37
TL074CN
TL074CN
1000/25V
C41
100nF
C7
100nF
AGND
U13
7812
C20
1000/16V
C15
100pF
C1
100nF
DGND
L9
LF22uH
C8
L12
C44
C42
100nF
U11 7912
C21
C16
C3
LF22uH
1000/25V
100nF
U10
1000/16V
100pF
100nF
(OPT)
7808
1
U12
MK3.1-EXTENSION ( IN/OUT & POWER )
Titel
100nF
7805
L13
JP3 J10MM
2
C25
C24
47/25V
C18
LF22uH
5-May-2002
G2PU1.Sch
A4
Size
File:
Date:
2200UF/16V
C14
1000/16V
C17
100pF
C13
100nF
1
2
22K
3
AGND
( Analog stage connecter )
-12VA
+12VA
C19
100nF
14
U6E
+5VD
C30
100nF
AGND
4
U2E
C5
100nF
L14
330uH
4
U1E
+12VA
AGND2
C45
100nF
8
U3C
+12VA
C
+12VA
7
74HC08
11
TL074CN
11
TL074CN
4
TL072CN
J1
VR1
B500R
VR2
STEREO->
<-MONO
1
2
22P
3
SW SLIDE-A
**OUT -L
R8
22K
1
3
2
R7
22K
C12
47uF/25V
L4
LF22uH
2
1
3
S1
BAL-FEMALE
D
SW1
C23
B500R
R5
22K
22P
C22
U3A
TL072CN
AGND
AGND2
6
R4
22K
C10
47uF/25V
L2
LF22uH
1
S2
BAL-FEMALE
22K
R11
R6
22K
C11
47uF/25V
L3
LF22uH
4
INPUT2
(MONO IN)
3P-2.5
**OUT -R
7
U3B
TL072CN
5
R12
R3
22K
C9
47uF/25V
L1
LF22uH
2
3
4
INPUT 1
AGND
-12VA
RXDM
R30
220R
+5VD
6
4
CN1
5
1
R34
220R
5
3
MIDI I N
DGND
ISO1 H11L1(QTC)
AGND
2
C31
100nF
D1
1N4148
AGND
C6
100nF
1
2
4
-12VA
AGND
C46
100nF
-12VA
B
TXD
12
13
DGND
U6D
74HC08
11
+5VD
R33
1
220R
4
CN2
R35
2
5
3
MIDI OUT
220R
+5VD
10
U6C
74HC08
8
+5VD
R31
220R
1
2
4
5
CN3
MIDI THRU
A
DGND
9
R32
220R
DGND
3
1 2 34
MK31 PCB LAYOUT
4. Printed Circuit Diagram
TOP LAYER
TOP SOLDER MASK
BOTTOM SOLDER MASK BOTTOM LAYER
TOP SILKSCREEN
--------------------------------------------------------------------------NCDrill File Report For: MK31-EMI.PCB
--------------------------------------------------------------------------Layer Pair : TopLayer to BottomLayer
ASCII File : NCDrillOutput.TXT
EIA File : NCDrillOutput.DRL
Tool Hole Size Hole Count Plated
--------------------------------------------------------------------------T1 20mil (0.50mm) 328
T2 24mil (0.60mm) 2
T3 31mil (0.80mm) 64
T4 36mil (0.90mm) 69
T5 138mil (3.50mm) 6 NPTH
--------------------------------------------------------------------------Totals 469
DRILL DRAWING
MK31
MK31-FDKB PCB LAYOUT
BOTTOM SOLDER MASK
BOTTOM LAYER
TOP LAYER & TOP SOLDER MASK
TOP SILKSCREEN
DRILL DRAWING
Tool Hole Size Hole Count Plated
--------------------------------------------------------------------------T1 39mil (1.00mm) 36
T2 98mil (2.50mm) 14 NPTH
T3 126mil (3.20mm) 3 NPTH
--------------------------------------------------------------------------Totals 53