Alto PBM4 SISTEMA User manual

www.altoproaudio.com
Version 2.0
MODEL: PS 4LA
MODEL: PBM4

CONTENT
1. Function Introduction…………………………………………………………….2
2. Specification……………………………………………………………………….2
3. Block Diagram……………………………………………………………………..3
4. Schematic Diagram……………………………………………………………….4
5. Wiring Diagram………………………………………………………… …………9
6. PCB Layout……………………………………………………………... ………..10
7. Test Procedure…………………………………………………………………....17
8. Exploded Views & Mechanical PartsList…………………………………….25
9. BOM…………………………………………………………………………………29
1

The PBM4 is professional monitor. It is packed with some key features. For example: there is four MIC/LINE
inputs which provided with ultra low noise microphone pre-amplifiers and phantom power at +15V, each of
them features a 2-band equalizer, one AUX send and level control. FX MAIN/MONITOR outputs,16-position
multi-effect and soon.
Microphone Input
Electronically balanced, discrete input
Frequency response
10Hz to 55kHz, +/- 3dB
Distortion(THD&N)
0.05% at +4dBu, 1kHz
Gain
30dB
SNR(Signal to Noise Ratio)
>94dB
Line input
Electronically balanced
Frequency response
10Hz to 55kHz, +/- 3dB
Frequency response
0.05% at +4dBu, 1kHz
Input channels
Gain
10dB
Microphone Input
1.4kOhm
Channel Insert return
2.5kOhm
All other inputs
10kOhm or greater
Tape out
1kOhm
Impedance
All other outputs
120Ohm
Hi shelving
+/-15dB@12kHz
Equalization
Low shelving
+/-15dB@80Hz
DSP Section
A/D and D/A converters
24bit
DSP resolution
24bit
Type of effects
REV+DELAY, and REV+CHORUS
REVERBS, Stereo DELAY, Chorus
Presets
16
Controls
16-position PRESET selector
CLIP LED
MUTE SWITCH with LED indicator
Noise(Bus noise)
Fader 0 dB, channels muted: -85dBr (ref.:
Fader 0 dB, all input channels assigned and
UNITY gain: -81dBr(ref.: +4dBu)
M max out ONITOR
+22dBu unbalanced, 1/4"jacks
Main Mix Section
FX Sends max out
+22dBu
Output Power
150W RMS (Nominal power)
Frequency Response
25HZ-20KHZ
Amplifier Section
Output Impedance
8 ohm
Dimensions
216.5
×
143.5
×
152.5mm(L
×
W
×
H)(8.5"
×
5.6"
×
6")
Net Weight
9.5kg
Shipping Weight
11.34 kg
Physical
Volume
2.8CFT
1. Function Introduction
2. Specification
2

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+15V
PHANTOM
[-40/-20dB] [-30/-10dB]
LOW-Z
HI-Z
PBM4MX BLOCK-final.Sch
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PBM4-MX BLOCK AND LEVEL DIAGRAM
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PBM4-MX VER050105
A2
BLOCK DIAGRAM
[10dB]
[-10dB]
2-STAGE EQ
LOW HI
LEVEL
DFX SEND
DFX(DSP)
[0dB]
[-6dB]
CH INPUT
(CH1-4)
DFX (DSP)
OFF
ON
HA
ALTO PBM4
MAIN-BUSMAIN BUS
FX RETURN
MAIN BUS
3c 5e 1a 4d 2b
T
R
S
RN TN
DSP BOARD
PRESETS
MUTE
DSP FOOTSWITCH
AUX/DFX RET
DFX SEND
POWER AMPLIFIER
MAIN BUS
1
AUX SEND2
T R S S
2
T R S
MAIN BUS
TAPE IN
2-TRACK
MONITOR OUT
T R S
MONITOR LEVEL
TAPE OUT
2TK IN
LEVEL
OUTPUT
MAIN LEVEL
7-STAGE EQ
63Hz
160Hz
400Hz
1KHz
2.5KHz
6.3KHz
16KHz
( 4 POINT )
3. Block Diagram
3

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1
NC
2
OUT
3
V-
4
V+
5
NC
6
GND
7
MUTE
8
-VIN
9
+VIN
10
NC
11
U1
LM3886
V+
1
NC
2
OUT
3
V-
4
V+
5
NC
6
GND
7
MUTE
8
-VIN
9
+VIN
10
NC
11
U2
LM3886
C36
0.1UF/275V
C2 100NF
C15 100NF
C17 100NF
C6 100NF
1
2
3
4BR
BU10--04 C35
6800UF/50V C41
470UF/35V C31 470UF/35V
C5
100UF/50V
C1
100UF/50V
C19 330UF/16V
C18 47UF/50V
C37 1000UF/35V C30 1000UF/35V
C13 6800UF/50V
R7 2.2K
R5 2.2K
R13
47K
R15 61.9K R19 61.9K
R7 2.2K
R18 3.48K R16
3.48K
R8 100
R4
1K
R1 33K
D3 IN4004
D6 IN4004
D4 IN4004 D5 IN4004
Q1
2N5551
C10 100NF
C9
47UF/25V
C4 100NF
C7 100NF
C8
100UF/50V C3
100UF/50V
R6 1K R2 33K
C12 100NF
C11
47UF/25V
+VA
+15V
-VA
-15V
-VA
+VA+VA
-VA
GND
C20 1UF/50V
GND
GND
INPUT+
S1
SW SPST
GND
T1 TRANS5
GND
SP1 SPEAKER
AC LAMP NEON
SP2 SPEAKER
1 2 3 4 5 6 7 8 9
10
CN2 CON10
F? FUSE1
GND
OUT1
GND
GND
OUT2
INPUT-
GND
INPUT+
GND
SP1
GND
INPUT-
SP2
C14 100UF/50V
-15V
2.6V
2.6V
GND
35V
20V
+15V
27V
27V
GND
34.7V
35V
SP2
34.9V
OUT2
PBM4
PING LU TANG
SP1
2004/11/01
OUT1
IN
2OUT 3
GND 1
U3 7915
Vin
1
GND
2
Vout 3
U6 7815
PC250 PC250 PC250
GND
D2 IN4737 D1 IN4737
R3 95O R9 200O
4. Schematic Diagram
4

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J1
JY5042-030G
84
U1C
4580M
CH1 INPUT
-VCC
CGND
+VCC
C1
47U/50V
R56
2K2
C82
100N
R2
6K8
C81
100N
R7
10K
R1
6K8
84
U4C
4580M
+PHANTOM
C88
100N
C2
47U/50V
C87
100N
R59
2K2
3c
5e
1a
4d
2b
J2
SCJ-0658-1-Y
C8
47U/25V
R58
22K
C7
47U/25V
R57
22K
3
2
1
U1A
4580M
R34
10K C21
22P
R8
10K
C22
22P
R74
1K
CH1 LINE
C90
100N
C89
100N
84
U5C
4580M
PBM4-MX_1.Sch
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PBM4 INPUT SECTION
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PBM4 V1.0
A3
MAIN SECTION
PBM4-MX_2.SCH
C9
47U/25V
PBM4 (1/4)
R80
3K
C23
22P
5
6
7
U1B
4580M
R97
3K9
R98
3K9
(PRE) POST
J11
100Hz
EQ HI
10KHZ
VR1
B50K
C47
47U/25V
5
6
7
U2B
4580M
MAIN-BUS
R9
10K
R105
1M
AUX-POST
C66
22P
LEVEL
R121
5K1
C50
47U/25V
VR2
B50K
R86
8K2
LOW
C67
22P
R85
8K2
R116
36K
C43
4N7(M)
R112
8K2
C49
47U/25V
R87
8K2
C39
4N7(M) VR4
W50K
3
2
1
U2A
4580M
C48
47U/25V
R35
22K
VR3
W50K
FX SEND
2
1
3
4
J3
JY5042-030G
CH2 INPUT
CGND
C3
47U/50V
R60
2K2
R5
6K8
R10
10K
R3
6K8
+PHANTOM
C4
47U/50V
R63
2K2
3c
5e
1a
4d
2b
J4
SCJ-0658-1-Y
C11
47U/25V
R62
22K
C10
47U/25V
R61
22K
3
2
1
U3A
4580M
R38
10K C24
22P
R11
10K
C25
22P
R75
1K
CH2 LINE
C12
47U/25V
R81
3K
C27
22P
5
6
7
U3B
4580M
R99
3K9
R101
3K9
(PRE) POST
J12
100Hz
EQ HI
10KHZ
VR5
B50K
C51
47U/25V
5
6
7
U4B
4580M
MAIN-BUS
R12
10K
R106
1M
AUX-POST
C68
22P
LEVEL
R122
5K1
C55
47U/25V
VR6
B50K
R89
8K2
LOW
C70
22P
R88
8K2
R117
36K
C44
4N7(M)
R113
8K2
C53
47U/25V
R90
8K2
C40
4N7(M) VR8
W50K
3
2
1
U4A
4580M
C52
47U/25V
R39
22K
VR7
W50K
FX SEND
2
1
3
4
J5
JY5042-030G
CH3 INPUT
CGND
C5
47U/50V
R64
2K2
R6
6K8
R13
10K
R4
6K8
+PHANTOM
C6
47U/50V
R69
2K2
3c
5e
1a
4d
2b
J6
SCJ-0658-1-Y
C14
47U/25V
R68
22K
C13
47U/25V
R67
22K
3
2
1
U5A
4580M
R43
10K C29
22P
R14
10K
C26
22P
R76
1K
CH3 LINE
C15
47U/25V
R82
3K
C28
22P
5
6
7
U5B
4580M
R100
3K9
R102
3K9
(PRE) POST
J13
100Hz
EQ HI
10KHZ
VR9
B50K
C56
47U/25V
5
6
7
U6B
4580M
MAIN-BUS
R15
10K
R107
1M
AUX-POST
C69
22P
LEVEL
R123
5K1
C61
47U/25V
VR10
B50K
R92
8K2
LOW
C71
22P
R91
8K2
R118
36K
C45
4N7(M)
R114
8K2
C54
47U/25V
R93
8K2
C41
4N7(M) VR12
W50K
3
2
1
U6A
4580M
C58
47U/25V
R45
22K
VR11
W50K
FX SEND
3
2
1
U7A
4580M
R126
10K
C32
22P
R44
10K
C30
22P
R77
1K
C16
47U/25V
R83
3K
C31
22P
5
6
7
U7B
4580M
R103
3K9
R104
3K9
(PRE) POST
J14
100Hz
EQ HI
10KHZ
VR13
B50K
C57
47U/25V
5
6
7
U8B
4580M
MAIN-BUS
R16
10K
R108
1M
AUX-POST
C72
22P
LEVEL
R124
5K1
C62
47U/25V
VR14
B50K
R95
8K2
LOW
C73
22P
R94
8K2
R119
36K
C46
4N7(M)
R115
8K2
C60
47U/25V
R96
8K2
C42
4N7(M) VR16
W50K
3
2
1
U8A
4580M
C59
47U/25V
R48
22K
VR15
W50K
FX SEND
1
2
3
4
5
6
CN1
CN2.0-6P-180
1
2
3
4
5
6
CN2
CN2.0-6P
CGND
1
2
3
4
5
6
CN3
CN2.0-6P-180
1
2
3
4
5
6
CN4
CN2.0-6P
CGND
84
U2C
4580M
C84
100N
C83
100N
84
U3C
4580M
C86
100N
C85
100N
84
U6C
4580M
C92
100N
C91
100N
84
U7C
4580M
C94
100N
C93
100N
84
U8C
4580M
C96
100N
C95
100N
DSP SECTION
PBM4-MX_3.SCH
7 BAND EQ
PBM4-MX_4.SCH
2
1
3
4
J17
JY5042-030G
CH4 INPUT
CGND
C138
47U/50V
R170
2K2
R165
6K8
R166
10K
R42
6K8
+PHANTOM
C139
47U/50V
R173
2K2
3c
5e
1a
4d
2b
J18
SCJ-0658-1-Y
C141
47U/25V
R172
22K
C140
47U/25V
R171
22K
CH4 LINE
C145
47U/25V R180
2K2
C144
47U/25V R179
2K2
C143
47U/25V R178
2K2
C142
47U/25V R177
2K2
5

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PBM4-MX_2.Sch
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PBM4 MAIN & OUTPUT SECTION
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PBM4 01
A3
R129 1K5
C33 22P
3
2
1
U9A
4580M
MAIN-BUS C17
47U/25V
R135 12K
R51
100K
C35 22P
3
2
1
U11A
4580M
3
2
1
U10A
4580M
5
6
7
U11B
4580M
C20
47U/25V
FX SEND
R109
1M
D1
RLS4148 R139
100K
C19
47U/25V
R78
1K
EFFECT_IN
R79
1K
R141
680R
D5
GR
D6
GR
D7
YEL
D8
RED
3mm
3mm
3mm
3mm
30dB
10dB
0dB
10dB
R146
180R
MAIN VMETER
MAIN-OUT
PBM4 (2/4)
84
U11C
4580M
R133
22R 1/4W
R134
22R 1/4W
+VCC
-VCC
84
U10C
4580M
+VCC
-VCC
84
U12C
4580M
84
U13C
4580M
C104
100N
C103
100N
84
U9C
4580M
C99
100N
C100
100N
C18
47U/25V
C63
47U/25V
MAIN LEVEL R50
22K
MAIN-OUT
C97
100N
C98
100N
3
2
1
U13A
4580M
R21 10K
R137
5K6
C119
56P
R128
47K
R149
100R 1/4W
R22
10K
R138
5K6
C120
56P
R127
47K
R150
100R 1/4W
3c
5e
1a
4d
2b
J8
SCJ-0658-1-Y
CGND
5
6
7
U13B
4580M
MONITOR OUT
MAIN-OUT
3c
5e
1a
4d
2b
J9
SCJ-0658-1-Y
OUT-1
3c
5e
1a
4d
2b
J10
SCJ-0658-1-Y
OUT-2
1
2
3
4
5
6
7
8
CN6
CN2.0-8P
1
2
3
4
5
6
7
8
CN5
CN2.0-8P-180
R147
27K
VR21
W50K C65
47U/25V
C64
47U/25V
R52
22K
R148
7K5
MONITOR OUT R120
36K
C36
22P
R54
22K
R53
22K
5
6
7
U12B
4580M
MAIN POWER OUTPUT
TO AMPLIFIER BOARD
(MIN. LOAD 8OHMS)
R151
3K9/0805
D9
GR
+VCC
OPERATING
C122
4U7/63V(NP)
GND1 TP1
R20
680R
VR20
B50K 3
2
1
U12A
4580M
R131
22K
C34
22P
C102
100N
C101
100N
C106
100N
C105
100N
+VCC
-VCC
MAIN-OUT
3
2
1
U19A
4580M
5
6
7
U19B
4580M
R19
22K
C78 22P
R71
5K6
R17
6K8
R130
39K
C118 10P
R70
22K 3
2
1
U20A
4580M
5
6
7
U20B
4580M
R125
5K6
C79
22P
R18
6K8
R136
39K
C134
10P
MON_EQ_SOURCE
MON_EQ_OOL_1MON_EQ_OOL_2
7 BAND EQ
84
U20C
4580M
84
U19C
4580M
C80
100N
C115
100N
C117
100N
C116
100N
+VCC
-VCC
3c
5e
1a
4d
2b
J15
SCJ-0658-1-Y
CGND FX SEND
EFFECT_IN
RTN_L
RTN_R
3c
5e
1a
4d
2b
J16
SCJ-0658-1-Y
CGND FX RETURN
C74
47U/25V
CGND
C77
100P
R46
22K
TAPE IN
R66
2K2
R65
2K2
1 4
2 5
3 6
J7
RCA4-SCP687
CGND
TAPE OUT
C75
47U/25V R47
22K
CGND
C76
100P VR17
W50K
R167
10K
1
2
3
4
5
6
CN11
CN2.0-6P
1
2
3
4
5
6
CN10
CN2.0-6P-180
CGND
MAIN-BUS
MAIN-OUT
3c
5e
1a
4d
2b
J19
SCJ-0658-1-Y
CGND FOOTSW
FOOTSW
1
2
3
CN12
CN2.5-3P-180
+PHANTOM
1
2
3
SW1
6P-SL2020
CGND
R174
8K2
R49
2K7
R181
470R 1/2W
C146
470uF/50V
CGND
1
2
3
4
5
CN9
2.5-5P
+VCC
-VCC
+VCC
R32
100R 1/4W
C135
100uF/25V
C125
100N
6

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PBM4-MX_3.Sch
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PBM4 DSP SECTION
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PBM4 01
A3
DSP-OUT-L
R153
15K R132
56K
R154
12K MAIN-BUS
AUX/DFX RET
1
2
3
4
COM
SW2
BINARY 4BIT ENCODER
1
2
4
8
PROGRAM
DSP-OUT-L
PIN1 CONN
DSP-OUT-R
12
34
56
78
910
1112
1314
1516
CN8
HEADER 8X2
+5V
DSP-M-OUT
DSP-IN
C129
1U/50V
-VCC
5
4
6
SW3B
PS-22E85L-2
2
1
3
SW3A
PS-22E85L-2
R160
220R
DSP MUTE
+5V
PBM4 (3/4)
R142
680R
R143
680R R144
680R
R145
680R
84
U14C
4580M
+VCC
-VCC
84
U15C
4580M
C112
100N
C111
100N
R140
100K
R155
220K D3
RLS4148
C126
47uF/50V
+VCC
-VCC
D4
RLS4148
GND
VR22
W50K
5
6
7
U14B
4580M
3
2
1
U14A
4580M
C127
1N5 R27 10K
R26
10K
C38
22P
R28
10K
C37
22P
R73
2K2
R55
22K
EFFECT_IN
R159
220R
R84
6K8
LD1
RED
3
2
1
U15A
LM393
5
6
7
U15B
LM393
R157
4K7
+VCC
R29
10K
C107
100N
R111
1M
R158
2M2
R161
820K
D11
RLS4148
PEAK(FLICKER)
MUTE(GLOW)
C124
47U/25V R72
2K2
DSP-IN
S
2
D1 G
3
TR1
J176
D2
RLS4148
DSP-OUT-R
C123
3N3
5
6
7
U10B
4580M
R152
10R
R25
10K
R24
10K
C121
56P
R23
10K
MUTE
CLK 12
J14
S
11
R
15
Q
10
Q
9K13
U17B
74HC109
+5V
R30
10K
12
U18A
74HC14
C131
100N
DGND
+5V
R31
10K
C132
1U/50V
34
U18B
74HC14
56
U18C
74HC14
DGND
OUT
3RS 4
TG 2
TH 6
CTR
5
DS
7
U16A
NE555
C108
100N
DGND
+5V
R110
1M
C130
220N
DGND
DSP-M-OUT
D10
RLS4148
R156
1M
C128
100N
MUTE
D13
RLS4148
D12
RLS4148
DGND
8 9
U18D
74HC14
12 13
U18F
74HC14
DGND
CLK 4
J2
S
5
R
1
Q
6
Q
7K3
U17A
74HC109
DGND
10 11
U18E
74HC14 DGND
147
U18G
74HC14
168
U17C
74HC109 C114
100N
C113
100N
+5V
DGND
C133
10UF/25V
81
U16B
NE555
R162
0R0
C110
100N
C109
100N
RTN_L
RTN_R R164
27K
R163
27K
FOOTSW
R176
22K
R175
10K
TR2
7805
+VCC
C148
220U/16V
R33
82R 1/4W
C147
10UF/25V
7

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7654321
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PBM4-MX_4.Sch
Titel
Size
File:
Date:
Drawn By:
Sheet
RevisionModel No:
8-Jan-2005
SHUNG LIN
PBM4 7 BANE EQ
44of
PBM4 01
A3
160Hz FREQUENCY BAND
3
2
1
UF2A
4580V
CF2_1
220N
RF2_1
8K2
RF2_2
1K2
CF2_2
220N
RF2_3
8K2
RF2_4
8K2
RF2_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_SOURCE
50Hz FREQUENCY BAND
5
6
7
U9B
4580M
CF1_1
220N
RF1_1
15K
RF1_2
5K6
CF1_2
220N
RF1_3
15K
RF1_4
15K
RF1_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_SOURCE
400Hz FREQUENCY BAND
5
6
7
UF2B
4580V
CF4_1
33N
RF4_1
39K
RF4_2
1K8
CF4_2
33N
RF4_3
39K
RF4_4
39K
RF4_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_SOURCE
1KHz FREQUENCY BAND
16KHz FREQUENCY BAND
3
2
1
UF3A
4580V
5
6
7
UF4B
4580V
CF5_1
10N
CF9_1
1N
RF5_1
47K
RF9_1
27K
RF5_2
2K7
RF9_2
2K2
CF5_2
10N
CF9_2
1N
RF5_3
47K
RF9_3
27K
RF5_4
47K
RF9_4
27K
RF5_5
18K
RF9_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_OOL_1
MON_EQ_SOURCE
MON_EQ_SOURCE
2.5Hz FREQUENCY BAND
5
6
7
UF3B
4580V
CF6_1
10N
RF6_1
22K
RF6_2
1K
CF6_2
10N
RF6_3
22K
RF6_4
22K
RF6_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_SOURCE
6.3KHz FREQUENCY BAND
3
2
1
UF4A
4580V
CF8_1
1N
RF8_1
100K
RF8_2
3K3
CF8_2
1N
RF8_3
100K
RF8_4
100K
RF8_5
18K
MON_EQ_OOL_2
MON_EQ_OOL_1
MON_EQ_SOURCE
PBM4 (4/4)
RF1_7A
W100K
RF1_7B
W100K
RF2_7A
W100K
RF2_7B
W100K
RF4_7A
W100K
RF4_7B
W100K
RF9_7A
W100K
RF9_7B
W100K
84
UF2C
4580V
84
UF3C
4580V
84
UF4C
4580V
+VCC
-VCC
C136
100N
C137
100N
RF5_7A
W100K
4
5
6
RF5_7B
W100K
RF6_7A
W100K
RF6_7B
W100K
RF8_7A
W100K
RF8_7B
W100K
8

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Title
Number RevisionSize
B
Date: 3-Feb-2005 Sheet of File: PBM4Drawn By:
PBM4 WIRING DIAGRAM
PING LU TANG
PBM4 WIRING DIAGRAM
F1 FUSE1
S1 SW-SPST T1
TRANS4
AC 230V
1
2
3
4
D1
BRIDGE1
IN/OUT MX
5. Wiring Diagram
9
Amp module

0
00
000 0
0
0
000
0
0
0000
6. PCB Layout
(1) PCB: PBM4-MX BOTTOM LAYER
PCB: PBM4-MX BOTTOM LAYER
10

PCB: PBM4-MX BOTTOMOVERLAY
11

00
0
0 0
00
000
0000
00
0
0
0
0
0
0
0
0
0
000
0
0
0
0
0
0
0
0
00
0
0
0
0
00
0
0
0
00
0
0
0
00
0
0
0
0
0
0
0
0
00
0
0
00
0
0
0
000
0000
0
0
0
000
0000
000
0
0
0
0
0
0
000
0
0
00
0
00
0
0
0 00 0000
000 0
00
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00 00 00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
00
0
0000
0
0
0
0
00
0
0
0
0
0
0
0
0
0
00
0
0
00
0
0
0
0
0
0
0
0
00
0000 0
0
00
0
0
0
00
0
0
0
0
0
0
00 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
00
0
0
0
0
00
0
0
00
00
0
0
0
0
0
0
0
0
0
0
0
0
00 0
0
00
0
0
0
0
0
0
0
0
0
00
0 0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
00
00
00
00
00
00 00
00
00
00
00
00
00
00 00 00
0
0
0
0
0
00
00
00 0
00
00
00
00
00
0
0
00
0
0
0
0
00
0
00
0
0
0
0
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00 00 0
0
0
0
0
0
0
00
0
0
000
00
0
0
0
0
0
00
0
00
0
00
0
0
0
0
00
0 00
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0 0
0
0
00
000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
00
0
00
0
0
0
0
0
00
0
0
0
00
00
00
00
00
00
00
00
00
00
00
00
0
00
0 0
0
0
0
0
0
0
0 0
00
00
0
0
0
0
0
0
0
0
0
00
000 0
0
0
000
0
0
0000
PCB: PBM-MX TOP LAYER
12

PCB: PBM-MX TOPOVERLAY
13

(2) PBM4-AMP
PCB: PBM4-AMP BOTTOM LAYER
PCB: PBM4-AMP BOTTOMOVERLAY
14

PCB: PBM4-AMP TOP LAYER
PCB: PBM4-AMP TOPOVERLAY
15

(3) 313123/2
PCB: 313123/2 TOP LAYER
PCB: 313123/2 BOTTOM LAYER
PCB: 313123/2 TOPOVERLAY
16

1 2 3 4 5 6
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Title
Number RevisionSize
B
Date: 3-Feb-2005 Sheet of File: PBM4Drawn By:
Oscillograph
OUTPUT INPUT
CH1 CH2
CH1=L CH2=H
7724
~V A
888888 888888
110V 220V
OFF SHORT UNSWITCH
110 220
Load OUT
DCIN
VOL
Load Sel
20A
AUX
NOR.L NOR.L AC
DCUT
2A
AMPERAS
AC
4 8 16
PBM4
OFF
ON
PBM4
SP1/OUT SP2/OUT
INPUT
AC220-240V
FUSE 2A
7. Test Procedure
17

1. Instruments
(1)AP(Audioprecision)
(2) Dual track Oscillograph
(3) DMM
2. Set up
(1) AP output: 0dBu 1KHz SINE(sine wave), load out 600ΩBal-Float.
(2)AP input: Load 100KΩBNC-Unbal. BW: 22Hz~22KHz. Fltr:A-weighting(12017)
3. Visual check
Inspect the appearance of PBM4. Ensure it is ok; the knob of the potentiometer should be no friction.
4. Testfunction
(1)Test the Phantom power
The power indicator lights up when you switch on PBM4. Set PHANTOM power switchto ON position.
The black pen of DMM connect to the first hole of MIC jack and respectively test CH1~CH4 of MIC
jack with DMM. The red pen of DMM respectively test the second hole and the third hole, the voltage
is 15V±2V. Set the switch to OFF position after finishing testing.
(2) Set PBM4
Turn all knobs to the middle position and turn all LEVEL knobs correspond to CH1~CH4 to the
maximum. Turn off DSP, the MAIN OUT indicator lights up when the AP signal input from LINE IN jack
of each channel; Set the AP output balanced when you test.
(3)Test DF/FX knobs for the output signal(CH1~CH4), MONITOR knobs and MAIN LEVEL
A. Set LEVEL knobs of CH1~CH4 to the maximum.
MAIN OUT: 3dBu(±3dBu), distortion <0.05%.Adjusting LEVEL knob,the output should be
changed accordingly.
MONTOR OUT LEFT: 8dBu(±3dBu), distortion <0.05%. Adjusting MONITOR knob,the output
should be changed accordingly.
FX SEND: 3dBu(±3dBu),distortion <0.003%. Adjusting DSF/FX knob of each channel,the
output should be changed accordingly
TAPE OUT: 3dBu(±3dBu), distortion <0.05%.
B. Set LEVEL knobs of CH1~CH4 to the minimum.
MAIN OUT: About -60dBu, it should be no signal output.
MONTOR OUT LEFT:About –70dBu(±3dBu), it should be no signal output.
FX SEND: About -70dBu(±3dBu), it should be no signal output.
TAPE OUT:About–70dBu(±3dBu), it should be no signal output.
C. Set the LEVEL knobs to the middle position
18

MAIN OUT: –7dBu(±3dBu), distortion <0.05%.
MONTOR OUT LEFT: -2dBu(±3dBu), distortion <0.05%
FX SEND: –7dBu(±3dBu), distortion <0.003%
TAPE OUT: –7dBu(±3dBu), distortion <0.05%
(4)Test the output signal of CH5/6, when input mono signal to LEFT IN.
A. Set the LEVEL knobs of CH5~CH6 to the middle position
MAIN OUT: –21dBu(±3dBu), distortion <0.1%.
MONTOR OUT LEFT: -16dBu(±3dBu), distortion <0.1%
FX SEND: About -70dBu(±3dBu)
TAPE OUT: –21dBu(±3dBu), distortion <0.1%
B. Set LEVEL knobs of CH5~CH6 to the minimum.
MAIN OUT:About -60dBu(±3dBu), it should be no signal output.
MONTOR OUT LEFT:About –70dBu(±3dBu), it should be no signal output.
FX SEND: About -70dBu(±3dBu), it should be no signal output.
TAPE OUT:About–70dBu(±3dBu), it should be no signal output.
(5)Test the function of FX RETURN input and AUX/DFX RET knob.
A. Switch on DSP, set the AUX/DFX RET to the maximum
MAIN OUT: -29dBu(±3dBu), distortion <0.2%. Adjusting LEVEL knob,the output should be
changed accordingly
MONTOR OUT LEFT: -23dBu(±3dBu), distortion <0.2%.Adjusting MONITOR knob,the output
should be changed accordingly.
FX SEND: About -72dBu(±3dBu)
APE OUT: -29dBu(±3dBu), distortion <0.2%.
B. Switch on DSP, set the AUX/DFX RET to the minimum
No signal output on each channel
C. Switch on DSP, set the AUX/DFX RET to the middle position
MAIN OUT: -34dBu(±3dBu), distortion <0.3%.
MONTOR OUT LEFT: -29dBu(±3dBu), distortion <0.3%.
FX SEND: About -72dBu(±3dBu)
TAPE OUT: -35dBu(±3dBu), distortion <0.3%.
(6)Test the indicator of output level for MAIN OUT
Set the level of output signal for AP TO 10dBu. Connect the signal input of AP with MAIN OUT.
Set MAIN LEVEL from the minimum to the maximum. Inspect the output level on the computer during test,
the level that displays on the indicator of unit is in accordance with the level that displays on the computer.
The error is ±2dBu, the indicators light up in sequence from low to high. Don’t make mistake.
(7)Test the function of PAD switch, MIC jack, DSP switch, FOOT SW and DSP.
19