Alto aCOMP Schematic
Service Manual
Model: αCOMP
24x32 Bit Digital Compressor Module
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 (aCOMP)
Electrical
Frequency Response: +0.5 / -1.5 dB from 20Hz to 20 kHz
S/N Ratio (process) 80 dB "A" wtg, 20 Hz-22kHz
S/N Ratio (bypass) >90 dB "A" wtg, 20 Hz-22kHz
THD+Noise: <0.008% @ 1kHz (0dBV, bypass)
Input
Number of Channels: 2
Format: 1/4" unbalanced
Maximum Level (bypass): +9 dBu
Impedance: >500 Kohms
A/D - D/A Conversions
A/D converter: 1 bit Sigma-Delta
D/A converter: 1 bit Sigma-Delta
Output
Number of Channels: 2
Format: 1/4" unbalanced
Maximum Level (bypass): +9 dBu
Output Impedance: <500 ohms
Front Panel
Controls Input/Output Levels (ANALOG)
PROGRAM selections (2 knobs)
Indicators Power, Signal clip LED
Rear Panel
IN/OUT levels (ANALOG) 1/4" 2-conductor (mono)
Output (LEFT, RIGHT) 1/4" 2-conductor (mono)
BYPASS 1/4" 2-conductor (auto-sense pedal type)
for momentary footswitches
Power 9 Volt AC Power Transformer
Processing and Memory
Processor Speed: 12 MIPs (million instructions per second)
Internal DSP resolution: 52 bit MPY accumulator
Main Preset Programs 16
Preset Total Combinations 256
Internal digital audio memory: 3000 milliseconds
Physical
Net Weight: 1kg(2.20lb)
Dimension(WxDxH): 200(mm) 150(mm) 45(mm)
(7.87" x 5.91"x 1.77")
D
2. Block Diagram
AC 9V
INPUT
C
B
A
4
PJ3
OUTPUT R
OUTPUT L
PJ4
POWER SU PPLY
VOLTAG E REGULATOR
-5V
+5V
LRCKIN=43.20KHZ
BCK=1.382MHZ
OUTPUT LEVEL
OUTPUT LEVEL
OUTPUT AMPLIF IER
321
( U10,U11 )
MEMORY (DRAM)
ED0-ED7
EA0-EA9
CLOCK DIVIDE
( U7 74HC393 )
Q1
11.0592MHZ
11.0592MHZ
MIX CONTROL
alphaverb BLOCK DIAG RA M
( U8 TMS57002DPHA )
( U9 P87C54UBAA )
SO0SI0
( U6 PCM3001E )
STEREO AUD IO C O D EC
A/D and D/A CO N VERT ER
IN-R IN-L OUT-R OUT-L
INPUT LEVEL
INPUT LEVEL
INPUT BUFF ER & AM PLIFIER
PROG RAM
ENCODER A
CONTROL
FOOTSWITCH
ENCODER B
VARIATIONS
PJ5
FOOT
PJ1
SWITCH
INPUT R
PJ2
INPUT L
(MONO INPUT)
1 2 34
DSP
AD0-AD7
MPU
D
C
B
A
D
3. Schematic Diagram
C
B
A
2002/01/06
8
DGND
ED6
ED7
23
22
25
26
EA8
18
EA7
EA6
EA5
EA4
LINK
LINK.SCH
C99
100nF
KEVIN LIN.
89
U10
U11C
74HC04D
5 6
7654321
U11E
74HC04D
10 11
U11D
74HC04D
DGND
U11F
74HC04D
12 13
DGND
GM71C4256BJ60
ED4
26
U9
R18
100R
LRCKIN
GM71C4256BJ60
ED0
1
CLK
U6A
74HC393D
Q03Q14Q25Q3
BCK
DGND
Q1
C95 100nF
RS-CODEC
+5V
28
11.0592MHz
DGND
22
24
23
VDD
FMT225FMT126FMT027RSTB
CLKIO
DGND
U5
PCM3001E
VINL1VCC12AGND13VREFL4VREFR5VINR6CINPR7CINNR8CINLN9CINPL10VCOM11VOUTR12AGND213VCC2
2
DGND
MR
U6B
6
CLK-Q3
R17
4K7
DGND
22P
C33
DGNDDGND
C32
22P
VOUTL
LRCKIN
SI0
BCK
SO0
19
17
21
20
XTI
XTO
15
18
DIN
DOUT
LRCIN16BCKIN
VOUTL
14
Q011Q110Q29Q3
74HC393D
CLK
13
SO0
OUTPUTLOUTPUTR
C31
1uF
R29
100K
R30
100K
8
LRCKIN
MR
12
DGND
12
U11A
C45
82P
DGND
AGND
74HC04D
+5V
BCKI
SI1
SI0
STRB
CLOAD
PLOAD
OE
I/0224I/03
CAS
DGND
I/001I/012WE3RAS4A95A09A110A211A312+5V
ED5
EA9
EA0
ED2
ED3
25
DGND
I/001I/012WE3RAS4A95A09A110A211A312+5V
ED1
EA8
23
22
18
OE
I/0224I/03
CAS
EA0
EA9
+5V
SYNC
80
SI1
79
SI0
78
NC
77
LRCKI
76
BCKI
75
NC
74
VSS
73
VCC
72
NC
71
STRB
70
69
68
67
R/W
66
CS
65
DGND
VOUTR
+5V
C30
1uF
A414A515A616A717A8
147
C96
100nF
13
EA1
EA2
EA3
EA4
EA5
EA6
EA7
A414A515A616A717A8
13
+5V
EA1
EA2
EA3
CAS
SO0
SO1
7
9
S006S01
OVM
10
CAS8RAS
CLKSEL
AD7
BIO
1
5
4
2
NC3NC
BCK0
LRCK0
SYPOL
CLOAD
DREADY
PLOAD
64
MUTE
EMPTY
RS
11
AD6
+5V
C97
CLKIN
U7
100nF
13
VSS12VSS
TMS57002
DGND
14
WE
AD5
DGNDDGND
a-verbIO.SCH
Analog Stage & Power supply
WE
WE
U11B
74HC04D
3 4
ED2
ED3
ED4
ED5
ED6
ED7
ED715ED616ED517ED418ED319ED220ED1
AD3
AD4
NC21NC
AD0
AD1
AD2
INPUTR
INPUTL
OUTPUTR
OUTPUTL
+5V +5V
INPUTL
INPUTR
OUTPUTL
OUTPUTR
ED0
ED1
23
24
22
ED0
EA0
25
EA9
EA8
EA1
NC
EA2
NC
EA3
EA4
VSS
VCC
EA5
EA6
NC
EA7
TEST0
TEST1
TEST2
EA841EA942NC43NC44D045D146D247D348NC49D450D551VCC52VCC53D654D755PC056BIO57OVFA58OVFM59RS60NC61NC62EMPTY63MUTE
+5V
EA0
26
EA1
27
28
EA2
29
30
EA3
31
EA4
32
33
EA5
34
35
EA6
36
37
EA7
38
39
40
U6C
74HC393D
C98
100nF
147
U11G
74HC04D
PJ5
DGND
+5V
R40 0R0
R39 0R0
R38 0R0
+5V
DL1
LJB0661-6
213
R2
10K
RED
(OVER-LOAD)
221133
L9
DGNDDGND
DGND DGND
A-VERBMAIN.SCH
Number RevisionSize
MODEL:ALTO AlphaVERB
Title
FSP
BLM21A102
R3
1K
C7
100nF
Footswitch live
R1
220R
A3
Date: 8-Jan-2002 Sheet of
File: D:\shung\PC27\ALTO\Digital\AlfaVerb\ SCHPCB\alphaverb.ddbDrawn By:
AGND2
DGND
OVM
C38 10uF
C36 470P
C37
C35
10uF
INPUTL
INPUTR
470P
+5V
ENCODERA4
C34
D3
D2
12345
ENCODERA3
C39
100nF
R28
4K7
10uF
COM
C40
R27
D1
COM
ENCODERA2
100nF
4K7
R37
+5V
AGND
D0
6
ENCA
288S0121
ENCODERA1
C41
R26
100nF
4K7
R25
4K7
DGND
+5V
C27
R31
47uF/25V
100R
JP2
2P-2.5
U8
P87C54UBAA
(AlphaComp:P87C52UBAA)
1
2
3
4
5
6
7
8
9
22
10
RST
R24
100K
25
NC
P 1.0
P 1.1
P 2.0/A824P 2.1/A9
P 1.2
P 1.3
P 1.4
P 1.5
P 1.6
P 1.7
VSS
RST
VDD
43
44
AD0
C28
100nF
DGND
C29
1uF
DGND
D4
1N4148
10K
P 2.2/A1026P 2.3/A1127P 2.4/A1228P 2.5/A1329P 2.6/A1430P 2.7/A15
AD1
AD2
AD3
AD4
DGND DGND
A15
35
34
31
NC23NC
EA/VPP
P 0.7/AD736P 0.6/AD637P 0.5/AD538P 0.4/AD439P 0.3/AD340P 0.2/AD241P 0.1/AD142P 0.0/AD0
XTAL121XTAL2
20
AD5
AD6
AD7
R36
ALE
PSEN
NC
RD/P3.7
WR/P3.6
T1/P3.5
T0/P3.4
INT1/P3.3
INT0/P3.2
TXD/P3.1
RXD/P3.0
10K
33
32
12
19
18
17
16
15
14
13
11
F11.0592M
+VCC
DL2
1/4W
470R
D1
COM
ENCODERB2
100nF
4K7
D0
6
C44
R33
RED
ENCB
ENCODERB1
100nF
4K7
R44
D3
D2
COM
12345
RS-CODEC
+5V
ENCODERB4
C42
R35
ENCODERB3
100nF
4K7
C43
R34
Footswitch live
(PWR ON)
288S0121
R32
DGND
4K7
DGND
1 2 3 4 5 6 78
D
C
B
A
D
C
B
A
R-OUT
PJ3
LJB0661-6
213
221133
C14
AGND
10nF
2
AGND2
AGND
C48
47P
SW2
DPDT
UP=compressor effect
DOWN=bypass
4
VR3A
321
U4A
A10K
R11
AS4
TL074CD
OUTPUT-A
4K7
L1
LF22uH
R20
270R
1
3
2
B1K
VR2A
MIXER-A
PJ4
AS3
U4B
TL074CD
VR3B
A10K
OUTPUT-B
R19
4K7
LJB0661-6
213
VR2B
221133
L6
R23
LF22uH
6
B1K
270R
7
MIXER-B
L-OUT
2002/01/06
KEVIN LIN.
330uH
C21
C19
AGND
100nF
AGND
100nF
-5V -5V
MODEL:ALTO AlphaVERB
Title
A-VERBIO.SCH
Number RevisionSize
AlphaVerb Analog Stage/Power Supply (Included AlphaComp)
A4
Date: 8-Jan-2002 Sheet of
File: D:\shung\PC27\ALTO\Digital\AlfaVerb\SCHPC B\alphaverb.ddbDrawn By:
C20
411
C18
411
+5VA +5VA
L7
BLM21A102
+5V
L2
LF22uH
100nF
U4E
100nF
U1E
TL074CD
TL074CD
-5VSGND
L3
AGND2
AGND
C26
10nF
C49
47P
AGND
5
R21
U4C
R6
10K
(opt alfacomp)
TL074CD
10
AS5
2K2
OUTPUTR
8
9
C23
PJ1
680P
LJB0661-6
U1D
AGND
VR1A
A10K
R7
1K
U1A
TL074CD
3
R4
1K
L4
LF22uH
2132211
33
AGND
C13
TL074CD
INTPUT-A
1
2
47uF/25V
13
C12
C9
14
12
47uF/25V
AS2
R5
220P
1
354
6
C5
10uF/16V
C3
100uF/25V
C15
47uF/25V
47P
U2 LM7805
C1
+VCC
C47
C10
2200uF/25V
D2
IN4002
AGND
AGNDAGND2
61
L10
PLT09H-2003R
INPUTR
C8
47uF/25V
C46
47P
AGND
AGND
1M
AGNDAGND2
R14
U4D
2K2
14
TL074CD
12
AS6
OUTPUTL
13
C24
PJ2
680P
LJB0661-6
R22
10K
(opt. alfacomp)
U1C
AGND
VR1B
A10K
INTPUT-B
R15
1K
U1B
TL074CD
5
R12
1K
L5
LF22uH
2132211
33
AGND
C17
47uF/25V
TL074CD
7
6
INPUTL
8
9
C25
C16
10
47uF/25V
AS1
R13
220P
AGND
1M
3 4
100uF/25V
-5VO
SGNDSGNDSGND
C6
10uF/16V
C4
100uF/25V
U3 LM79L05
C2
SGND
SGND
100uF/25V
C11
SGND SGND SGND SGND
220uF/25V
D3
IN4002
C22
100nF
SGND
1
3
2
SW1
PWR SW
456
P1
STARTGND
AGND2AGND
L8
BLM21A102
SGND
L12
BLM21A102
PS1
RX110
SGND
1 2 3 4
L11
BLM21A102
J1
DGND
R-INPUT
D
C
L-INPUT
(MONO IN)
B
AC 9V INPUT
A
BOTTOM LAYER
4. Print Circuit Board
BOTTOM SOLDER MASK
BOTTOM SILKSCREEN
TOP SILKSCREEN
DRILL DRAWING
Tool Hole Size Hole Count Plated
--------------------------------------------------------------------------T1 31mil (0.80mm) 203
T2 39mil (1.00mm) 13
T3 47mil (1.20mm) 42
T4 59mil (1.50mm) 30
T5 98mil (2.50mm) 1
T6 118mil (3.00mm) 3
T7 138mil (3.50mm) 2
--------------------------------------------------------------------------Totals 294
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