Alto APM 120 User manual

CONTENT
1. INTRODUCTION……………………………………………………………………………..1
2. TECHNICAL SPECIFICATION……………………………………………………………..3
3. BLOCK DIAGRAM……………………………………………………………....................5
4. SCHEMATIC DIAGRAM…………………………………………………………………….7
5. WIRING DIAGRAM………………………………………………………………………….11
6. PCB LAYOUT………………………………………………………………………………..13
7. TEST PROCEDURE………………………………………………………….....................19
8. EXPLODED VIEW & MECHANICAL PARTS LIST……………………………………..29
9. BOM…………………………………………………………………………………………..33

1. INTRODUCTION
APM120
- 8 MONO Inputs with gold plated XLR and balanced TRS JACK.
- GAIN and +48V Phantom power for mono/mic inputs.
- 2 Stereo Inputs with balanced TRS Jacks.
- Peak LED in each Channel.
- 3-band EQ with sweepable MID on mono inputs.
- 4-band EQ on stereo inputs
- 24-bit internal DSP with 256 effects, 16 preset by 16 variations.
With DSP mute switch and peak LED.
- Graphic Equalizer: 9 band (63, 125, 250, 500,1k, 2k, 4k, 8k, 16k Hz)
- BNC socket for connecting gooseneck lamps.
- Low cut filters-75Hz, 18dB/OCT on mono inputs.
- Low pass filter on mono output (80~120Hz).
- 4 AUX sends (AUX 1.2 pre/post, AUX 3.4 post).
- Foot switch digital effect on/off.
- Highly accurate 12 segment Bar graph Meters.
- Maximum Output Power: 500W+500W/4ohms. (1000 bridge/8ohms).
- Performance and excellent noise figures.
- Manufactured under ISO9001 certified management system.

APM160
- 12 MONO Inputs with gold plated XLR and balanced TRS JACK.
- GAIN and +48 Phantom power for mono/mic inputs.
- 2 Stereo Inputs with balanced TRS Jacks.
- Peak LED in each Channel.
- 3-band EQ with sweepable MID on mono inputs.
- 4-band EQ on stereo inputs.
- 24-bit internal DSP with 256 effects, 16 preset by 16 variations.
With DSP mute switch and peak LED.
- Graphic Equalizer: 9 band (63, 125, 250, 500, 1k, 2k, 4k, 8k, 16k Hz)
- BNC socket for connecting gooseneck lamps.
- Low cut filters-75Hz, 18dB/OCT on mono inputs.
- Low pass filter on mono output (80~120Hz).
- 4 AUX sends (AUX1, 2 pre/post, AUX3, 4 post)
- Foot switch digital effect on/off.
- Highly accurate 12 segment Bar graph Meters.
- Maximum Output Power: 750W+750W/4ohms. (1500W bridge/8ohms).
- Performance and excellent noise figures.
- Manufactured under ISO9001 certified management system.

Input
Input Impedance Mic 2kohm Balanced
Line 10kohm Balanced
Input Gain Mic Continuously variable from 0dB to +45dB
Input Gain Line-Mono Channel Continuously variable from -15dB to 30dB
Input gain Line-Stereo Channel Continuously variable from -20dB to +20dB
Maximum Input Level Mic +22dBu
Line (Mono Channel) +22dBu
Line (Stereo Channel) +22dBu
Insert send impedance 100ohm Unbalanced
Insert send level/Max -10dBu/+22dBu
Insert return impedance 10kohm Unbalanced
Insert return level /Max -10dBu/+22dBu
CMR at 1kHz Line(20Hz-20kHz) >80dB
Frequency response Mic to Mix 20Hz-20kHz +0/-1dB
Signal/Noise Ratio (20Hz-20kHz) Mic EIN ref. 150ohms-101dBu (gain+60dB)
System Noise (20Hz-20kHz)
Summing Noise -85dBu (16 channels routed with faders down)
Line to Mix Noise -83dBu (16channels routed at 0dB, pan centre)
Distortion at 1kHz Mic to Insert (+30dB unity gain, +20dBu output)<0.01%
Mic to Mix (+30dB unity gain, +20dBu output) Typ 0.03%)
Crosstalk at 1kHz channel to channel >-75dB
Mix to Mix >-78dB
Channel to Mix >-80dB
Fader Attenuation >100dB
Output (Nominal Signal Level Mic -60dBu to 0dBu –Line 0dBu)
Output Impedance All Line Outputs 100ohm Balanced
Insert send impedance 100ohm Unbalanced
Insert send level/Max. +22dBu
Insert return impedance 10kohm Unbalanced
Insert return level/Max. +22dBu
Maximum Output level Master Outputs on XLR +22dBu
All other Outputs on XLR +22dBu
All Outputs on 1/4 inch jacks +22dBu
headphones +22dBu/600ohm

Equalizer- Mono Channel
Treble -shelving +15/-15dB @12kHz
MID –peak/clip +15/-15dB – frequency range 100Hz~8kHz bandwidth 1 octave
Bass –shelving +15/-15dB @80Hz
Hi Pass Filter 18dB/oct @75Hz
Equalizer –Stereo Channel
Treble –shelving +15/-15dB @12kHz
Hi Mid –shelving +15/-15dB @3kHz
Lo Mid –shelving +15/-15dB @400Hz
Bass -shelving +15/-15dB @80Hz
A/D and D/A converters 24 bit
DSP resolution 24 bit
Hall, Room, Vocal & Plate REVERBS
Mono &Stereo DELAY (max DELAY TIME 650ms)
Chorus, Flanger & Reverb MODULATIONS
REVERB+DELAY, REVERB+CHORUS
Type of effects
REVERB+FLANGER combinations
Presets 256
16-position PRESET Selector
16-position VARIATION Selector
PEAK LED
DSP Section
Controls
MUTE SWITCH with LED indicator
Power AMP
Mode Stereo Bridged
APM120 2*500 Watts EIAJ (4ohms) 1*1000 Watts EIAJ (8ohms)
APM160 2*750 Watts EIAJ (4ohms) 1*1500 Watts EIAJ (8ohms)

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MONO INPUT CHANNELS ( 1-8)
2 1 3
MIC IN
+48V
4-BAND EQ 12K100Hz-8kHz80
HI PASS
2
1 3
LO CUT
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-2
RIGHT-BUS
LEFT-BUS AUX-2 AUX-1
STEREO INPUT CHANNELS (9-12)
LEFT-BUS
RIGHT-BUS
LEFT-BUS RIGHT-BUS
RIGHT
2TK OUT
75Hz +/-15db
4-BAND EQ12K50080
+/-15db
LEFT
EQ(ON/OFF)
ST SUB IN (1-3)
-
+
PHANTOM
LINE IN
GAIN
-
+
POWER
-
+
LO (FREQ) HI
FADER LEVEL
PFL L
BALANCE
FADER LEVEL
3c 5e 1a 4d 2b
LEFT(MONO)
3c 5e 1a 4d 2b
RIGHT
T
R
S
RN TN
T
R
S
RN TN
-
+
-
+
MIC GAIN:0~60dB LINE IN TRIM:+15dB~-45dB
PFL L / AFL L
PFL R / AFL R
3c 5e 1a 4d 2b
INSERT
T
R
S
RN TN
MID
LO M-H HIL-M
3K
4-BAND EQ12K50080
+/-15db
3K
3c 5e 1a 4d 2b
X8
JY 6351G 02 250
3c 5e 1a 4d 2b
X9
JY 6351G 02 250
APM120 BLOCK DIAGRAM
T
R
S
RN TN
T
R
S
RN TN
LEVEL SET PEAK
POST
PRE
POST
PRE
AUX-3
AUX-4(EFFECT)
AUX-3 AUX-4
(-16~-60dB) (+10~-34dB)
GAIN
(+10~-34dB)
LEVEL SET PEAK
ON
AUX-2 AUX-1
POST
PRE
POST
PRE
AUX-3 AUX-4 PFL R PFL L PFL R
DSP BOARD
PRESETS
VARIATIONS
MUTE
DSP FOOTSWITCH
EFFECT RTN
SUM SUM
9-BAND EQ 9-BAND EQ
63Hz
12 Hz
250Hz
500Hz
1KHz
2KHz
4KHz
8KHz
6KHz
BA BA
LEFT
RIGHT
BA BA
LEFT
RIGHT
ST SUB OUT
ST OUT
ST SUB OUT
ST OUT
PEL AFL
SUM
PFL
LPF
80-120Hz
12db oct
MONO OUT
AFL AFL AFL
AUX SEND1 AUX SEND2
AUX1 MAIN L
MONO BRIDGE MONO BRIDGE
MONO MAIN R
AUX SEND3 EFFECT SEND PHONES
2TK IN
RIGHT
LEFT
2TK
LEVEL
PEL
AUX3 AUX4
INV
LEFT METER
RIGHT METER
PEL PFL
BA
BA
BA
AUX1 AUX2
MONO OUT
AUX3
AFL
3c 5e 1a 4d 2b
LEFT
3c 5e 1a 4d 2b
RIGHT
SIGNAL SELECT
POWER AMP
(ON / OFF)
L R
SPEAKERS
AUX2
AUX1
ON
AUX1 AUX AUX3 AUX4
PAN
ST
AUX1 AUX2 AUX3
PEL
AUX1 AUX2 AUX3
PEL
PHONES
IN
(FREQ)
P. AMP INSERT

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MONO INPUT CHANNELS ( 1-12)
2 1 3
MIC IN
+48V
4-BAND EQ 12K100Hz-8kHz80
HI PASS
2
1 3
LO CUT
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-2
RIGHT-BUS
LEFT-BUS AUX-2 AUX-1
STEREO INPUT CHANNELS (13-16)
LEFT-BUS
RIGHT-BUS
LEFT-BUS RIGHT-BUS
RIGHT
2TK OUT
75Hz +/-15db
4-BAND EQ12K50080
+/-15db
LEFT
EQ(ON/OFF)
ST SUB IN (1-3)
-
+
PHANTOM
LINE IN
GAIN
-
+
POWER
-
+
LO (FREQ) HI
FADER LEVEL
PFL L
BALANCE
FADER LEVEL
3c 5e 1a 4d 2b
LEFT(MONO)
3c 5e 1a 4d 2b
RIGHT
T
R
S
RN TN
T
R
S
RN TN
-
+
-
+
MIC GAIN:0~60dB LINE IN TRIM:+15dB~-45dB
PFL L / AFL L
PFL R / AFL R
3c 5e 1a 4d 2b
INSERT
T
R
S
RN TN
MID
LO M-H HIL-M
3K
4-BAND EQ12K50080
+/-15db
3K
3c 5e 1a 4d 2b
X8
JY 6351G 02 250
3c 5e 1a 4d 2b
X9
JY 6351G 02 250
APM160 BLOCK DIAGRAM
T
R
S
RN TN
T
R
S
RN TN
LEVEL SET PEAK
POST
PRE
POST
PRE
AUX-3
AUX-4(EFFECT)
AUX-3 AUX-4
(-16~-60dB) (+10~-34dB)
GAIN
(+10~-34dB)
LEVEL SET PEAK
ON
AUX-2 AUX-1
POST
PRE
POST
PRE
AUX-3 AUX-4 PFL R PFL L PFL R
DSP BOARD
PRESETS
VARIATIONS
MUTE
DSP FOOTSWITCH
EFFECT RTN
SUM SUM
9-BAND EQ 9-BAND EQ
63Hz
125Hz
250Hz
500Hz
KHz
2KHz
4KHz
8KHz
16KHz
BA BA
LEFT
RIGHT
BA BA
LEFT
RIGHT
ST SUB OUT
ST OUT
ST SUB OUT
ST OUT
PEL AFL
SUM
PFL
LPF
80-120Hz
12db oct
MONO OUT
AFL AFL AFL
AUX SEND1 AUX SEND2
AUX1 MAIN L
MONO BRIDGE MONO BRIDGE
MONO MAIN R
AUX SEND3 EFFECT SEND PHONES
2TK IN
RIGHT
LEFT
2TK
LEVEL
PEL
AUX3 AUX4
INV
LEFT METER
RIGHT METER
PEL PFL
BA
BA
BA
AUX1 AUX2
MONO OUT
AUX3
AFL
3c 5e 1a 4d 2b
LEFT
3c 5e 1a 4d 2b
RIGHT
SIGNAL SELECT
POWER AMP
(ON / OFF)
L R
SPEAKERS
AUX2
AUX1
ON
AUX1 AUX2 AUX3 AUX4
PAN
ST
AUX1 AUX2 AUX3
PEL
AUX1 AUX2 AUX3
PEL
PHONES
IN
(FREQ)
P. AMP INSERT

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APM MONO BOARD(1/1)
5 67
U2B 4580M
R69 62K R82
20K
C70 47uF/25V
C57
0.22u/50V
C58 0.22u/50V
C59 0.22u/50V
R77 6K8
1 2 3
SW1A PS-22E85L
4 5 6
P
SW1B
PS-22E85L
LO CUT
3c 5e 1a 4d 2b
X6
JY-6351G-02-250
T
R
S
RN TN
INSERT1
MIC GAIN -10~-60dB
LINE IN GAIN +10~-40dB
VR1
O10K
C1
470P C13
22uF/35V
R25 11K0
LINE IN1
MIC 1 C21
47uF/50V R33
3K60
R17 6K81 1/4W
PH PWR
C3 470P
R18 6K81 1/4W
C22 47uF/50V
C29 47P
R26 11K0 R34
3K60
C14
22uF/35V
R10 51K1
R9
51K1
C2
470P
2 1 3 4
X1 SMC-6.02
R45
5K11
R46
5K11
C38 22P C37 22P
R61
10K0
R41
27R
C33
1000u/10V
3 21
U1A
4580M R62
10K0 R47
5K11
C39 22P
R48 5K11
C40
22P
C69 47uF/25V
R81 20K
3c 5e 1a 4d 2b
X5
JY-6351G-02-250
5 67
U1B
4580M
3 21
U2A 4580M
R2 47R
R1
47R
R73
1K3
RTN-CH1
D1 4148 D3
4148
D2 4148 D4
4148
+17V 17V +17V 17V
R90 22K
R94 68K
R98 6K8
TR2 3904
TR1 3904
R106 1K50 +17V
LD1 YEL
PGND
LEVEL SET
R145 17K4
AUX1
R214 5K1
3 21
U4A 4580M
VR6A D10K
R219 12K
C41 22P
VR8 W50K
C74
47uF/25V
LEVEL
R139 27K R140 27K
LEFT BUS
RIGHT BUS
PAN
AUX1
R150 5K1 A/PFL L
VR4 B50K
VR3 B50K
MID (FREQ=100Hz-8K)
C72 47uF/25V
C71
47uF/25V
VR2 B50K VR9
W50K
R146 17K4 AUX2
AUX2
2
1 3
SW2A
PS-22E85L
MUTE
R218 15K0
VR7 B5K
R226 2K7 R227 2K7
C73
47uF/25V
R210 47K0
R206
5K1
R99 6K8
TR4 3904
TR3 3904
R107 1K50
+17V
LD5 RED
PEAK
PGND
AUX SEND
AUX1 AUX2 AUX GND
AUX GND
2
1 3
SW3A PS-22E85L
5
4 6
SW3B PS-22E85L
2
1 3
SW4A PS-22E85L
5
4 6
SW4B PS-22E85L
R148 17K4
AUX3
VR10 W50K
AUX3 EXT
VR11 W50K
R149 17K4 AUX4 INT
AUX4
AUX GND AUX GND
R151 5K1 A/PFL R
2
1 3
SW5A PS-22E85L
5 67
U6B 4580M
R70 62K R84
20K
C76 47uF/25V
C60
0.22u/50V
C61 0.22u/50V
C62 0.22u/50V
R78 6K8
1 2 3
SW6A PS-22E85L
4 5 6
P
SW6B
PS-22E85L
LO CUT
3c 5e 1a 4d 2b
X8
JY-6351G-02-250
T
R
S
RN TN
INSERT2
MIC GAIN -10~-60dB
LINE IN GAIN +10~-40dB
VR12
O10K
C4
470P C15
22uF/35V
R27 11K0
LINE IN2
MIC 2 C23
47uF/50V R35
3K60
R19 6K81 1/4W
PH PWR
C6 470P
R20 6K81 1/4W
C24 47uF/50V
C30 47P
R28 11K0 R36
3K60
C16
22uF/35V
R12 51K1
R11
51K1
C5
470P
2 1 3 4
X2 SMC-6.02
R49
5K11
R50
5K11
C43 22P C42 22P
R63
10K0
R42
27R
C34
1000u/10V
3 21
U5A
4580M R64
10K0 R51
5K11
C44 22P
R52 5K11
C45
22P
C75 47uF/25V
R83 20K
3c 5e
a
4d 2b
X7
JY-6351G-02-250
5 67
U5B
4580M
3 21
U6A 4580M
R4 47R
R3
47R
R74
1K3
RTN-CH2
D5 4148 D7
4148
D6 4148 D8
4148
+17V 17V +17V 17V
R91 22K
R95 68K
R100 6K8
TR6 3904
TR5 3904
R108 1K50 +17V
LD2 YEL
PGND
LEVEL SET
R158 17K4
AUX1
R215 5K1
5 67
U4B 4580M
VR17A D10K
R221 12K
C46 22P
VR19 W50K
C80
47uF/25V
LEVEL
R152 27K R153 27K
LEFT BUS
RIGHT BUS
PAN
AUX1
R163 5K1 A/PFL L
C78 47uF/25V
C77
47uF/25V
VR20 W50K
R160 17K4 AUX2
AUX2
2
1 3
SW7A
PS-22E85L
MUTE
R220 15K0
VR18 B5K
R228 2K7 R229 2K7
C79
47uF/25V
R211 47K0
R207 5K1
R101 6K8
TR8 3904
TR7 3904
R109 1K50
+17V
LD6 RED
PEAK
PGND
AUX SEND
AUX1 AUX2
AUX GND AUX GND
2
1 3
SW8A PS-22E85L
5
4 6
SW8B PS-22E85L
2
1 3
SW9A PS-22E85L
5
4 6
SW9B PS-22E85L
R161 17K4
AUX3
VR21 W50K
AUX3 EXT
VR22 W50K
R162 17K4 AUX4 INT
AUX4
AUX GND AUX GND
R164 5K1 A/PFL R
2
1 3
SW10A PS-22E85L
5 67
U10B 4580M
R71 62K R86
20K
C86 47uF/25V
C65
0.22u/50V
C63 0.22u/50V
C64 0.22u/50V
R79 6K8
1 2 3
SW11A PS-22E85L
4 5 6
P
SW11B
PS-22E85L
LO CUT
3c 5e 1a 4d 2b
X10
JY-6351G-02-250
T
R
S
RN TN
INSERT3
MIC GAIN -10~-60dB
LINE IN GAIN +10~-40dB
VR23
O10K
C7
470P C17
22uF/35V
R29 11K0
LINE IN3
MIC 3 C25
47uF/50V R37
3K60
R21 6K81 1/4W
PH PWR
C8 470P
R22 6K81 1/4W
C26 47uF/50V
C31 47P
R30 11K0 R38
3K60
C18
22uF/35V
R14 51K1
R13
51K1
C9
470P
2 1 3 4
X3 SMC-6.02
R53
5K11
R54
5K11
C48 22P C47 22P
R66
10K0
R43
27R
C35
1000u/10V
3 21
U9A
4580M R65
10K0 R55
5K11
C49 22P
R56 5K11
C50
22P
C81 47uF/25V
R85 20K
3c 5e
a
4d 2b
X9
JY-6351G-02-250
5 67
U9B
4580M
3 21
U10A 4580M
R6 47R
R5
47R
R75
1K3
RTN-CH3
D9 4148 D11
4148
D10 4148 D12
4148
+17V 17V +17V 17V
R92 22K
R96 68K
R102 6K8
TR10 3904
TR9 3904
R110 1K50 +17V
LD3 YEL
PGND
LEVEL SET
R171 17K4
AUX1
R216 5K1
3 21
U8A 4580M
VR28A D10K
R223 12K
C51 22P
VR30 W50K
C85
47uF/25V
LEVEL
R165 27K R166 27K
LEFT BUS
RIGHT BUS
PAN
AUX1
R175 5K1 A/PFL L
C83 47uF/25V
C82
47uF/25V
VR31 W50K
R172 17K4 AUX2
AUX2
2
1 3
SW12A
PS-22E85L
MUTE
R222 15K0
VR29 B5K
R230 2K7 R231 2K7
C84
47uF/25V
R212 47K0
R208 5K1
R103 6K8
TR12 3904
TR11 3904
R111 1K50
+17V
LD7 RED
PEAK
PGND
AUX SEND
AUX1
AUX GND AUX GND
2
1 3
SW13A PS-22E85L
5
4 6
SW13B PS-22E85L
2
1 3
SW14A PS-22E85L
5
4 6
SW14B PS-22E85L
R173 17K4
AUX3
VR32 W50K
AUX3 EXT
VR33 W50K
R174 17K4 AUX4 INT
AUX4
AUX GND AUX GND
R176 5K1 A/PFL R
2
1 3
SW15A PS-22E85L
PFL
PFL
PFL
54
6
SW20B
PS-22E85L
LD17 GRN
54
6
SW5B PS-22E85L
54
6
SW2B
PS-22E85L
+17V
LD10 YEL LD11 GRN
54
6
SW10B
PS-22E85L
54
6
SW7B
PS-22E85L
LD12 YEL LD13 GRN
54
6
SW15B
PS-22E85L
LD14 YEL LD15 GRN
54
6
SW17B
PS-22E85L
LD16 YEL
54
6
SW12B
PS-22E85L
MUTE
Q1 BC337
R89 20K
+17V
D17 4148 D18 4148
17V
R235 100R
17V
/PFL
84
U1C 4580M
C125 100n C126 100n
+17V
17V
84
U2C 4580M
C127 100n C128 100n
84
U3C 4580M
C129 100n C130 100n
84
U4C 4580M
C131 100n C132 100n
84
U5C 4580M
C133 100n C134 100n
84
U6C 4580M
C135 100n C136 100n
84
U7C 4580M
C137 100n C138 100n
84
U8C 4580M
C139 100n C140 100n
84
U9C 4580M
C141 100n C142 100n
84
U10C 4580M
C143 100n C144 100n
84
U11C 4580M
C145 100n C146 100n
84
U12C 4580M
C147 100n C148 100n
84
U13C 4580M
C149 100n C150 100n
84
U14C 4580M
C151 100n C152 100n
21
3
SW33 SW-2WAY
1 2 3 4
CN1 HEADER 2
LD9 RED R234 10K0
PGND
R440
20K
8V
PH PWR
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
CN2 HEADER 10
AUX GND
LEFT BUS
RIGHT BUS
AUX1
A/PFL L
AUX2 AUX3 AUX4
A/PFL R
1 2 3 4 5 6 7 8
CN3 HEADER 4
+17V
17V
LEFT-BUS RIGHT-BUS
AUX1 AUX2 AUX3 AUX
A/PFL L A/PFL R
LEFT-BUS RIGHT-BUS
AUX1 AUX2 AUX3 AUX
A/PFL L A/PFL R
LEFT-BUS RIGHT-BUS
AUX1 AUX2 AUX3 AUX
A/PFL L A/PFL R
LEFT-BUS RIGHT-BUS AUX1 AUX2 AUX3 AUX A/PFL L A/PFL R
EQ HI (12K)
R115 5K6
R114 5K6 LO (80Hz)
R126 10K0
5 67
U3B 4580M
R130 1M0 C109 22P
R122 3K90
C93 33n(M) C94
33n(M)
C102
6n8(M)
C101
6n8(M)
3 21
U3A
4580M
R137 6K8
C110 22P R136 6K8
C117
4n7(M)
R134 6K8
VR5B 500KC
VR5A 500KC C121
2n7(M)
MID
R135 6K8
VR16 B50K
VR14 B50K
MID (FREQ=100Hz-8K)
VR13 B50K
EQ HI (12K)
R117 5K6
R116 5K6 LO (80Hz)
R127 10K0
5 67
U7B 4580M
R131 1M0 C111 22P
R123 3K90
C95 33n(M) C96
33n(M)
C104
6n8(M)
C103
6n8(M)
3 21
U7A
4580M
R177 6K8
C112 22P R159 6K8
C118
4n7(M)
R138 6K8
VR15B 500KC
VR15A 500KC C122
2n7(M)
MID
R147 6K8
VR27 B50K
VR25 B50K
MID (FREQ=100Hz-8K)
VR24 B50K
EQ HI (12K)
R119 5K6
R118 5K6 LO (80Hz)
R128 10K0
5 67
U11B 4580M
R132 1M0 C113 22P
R124 3K90
C97 33n(M) C98
33n(M)
C107
6n8(M)
C105
6n8(M)
3 21
U11A
4580M
R193 6K8
C115 22P R192 6K8
C119
4n7(M)
R190 6K8
VR26B 500KC
VR26A 500KC C123
2n7(M)
MID
R191 6K8
MIC GAIN -10~-60dB
LINE IN GAIN +10~-40dB
5 67
U13B 4580M
R72 62K R88
20K
C88 47uF/25V
C66
0.22u/50V
C67 0.22u/50V
C68 0.22u/50V
R80 6K8
1 2 3
SW16A PS-22E85L
4 5 6
P
SW16B
PS-22E85L
LO CUT
3c 5e 1a 4d 2b
X12
JY-6351G-02-250
T
R
S
RN TN
INSERT4
VR34
O10K
C10
470P C19
22uF/35V
R31 11K0
LINE IN4
MIC 4 C27
47uF/50V R39
3K60
R23 6K81 1/4W
PH PWR
C12 470P
R24 6K81 1/4W
C28 47uF/50V
C32 47P
R32 11K0 R40
3K60
C20
22uF/35V
R16 51K1
R15
51K1
C11
470P
2 1 3 4
X4 SMC-6.02
R57
5K11
R58
5K11
C53 22P C52 22P
R67
10K0
R44
27R
C36
1000u/10V
3 21
U12A
4580M R68
10K0 R59
5K11
C54 22P
R60 5K11
C55
22P
C87 47uF/25V
R87 20K
3c 5e 1a 4d 2b
X11
JY-6351G-02-250
5 67
U12B
4580M
3 21
U13A 4580M
R8 47R
R7
47R
R76
1K3
D13 4148 D15
4148
D14 4148 D16
4148
+17V 17V +17V 17V
R93 22K
R97 68K
R104 6K8
TR14 3904
TR13 3904
R112 1K50 +17V
LD4 YEL
PGND
LEVEL SET
RTN-CH
C89
47uF/25V
C90 47uF/25V
R213 47K0
R209 5K1
R105 6K8
TR16 3904
TR15 3904
R113 1K50
+17V
LD8 RED
PEAK
PGND
VR38 B50K
VR36 B50K
MID (FREQ=100Hz-8K)
VR35 B50K
EQ HI (12K)
R121 5K6
R120 5K6 LO (80Hz)
R129 10K0
5 67
U14B 4580M
R133 1M0 C114 22P
R125 3K90
C99 33n(M) C100
33n(M)
C108
6n8(M)
C106
6n8(M)
3 21
U14A
4580M
R197 6K8
C116 22P R196 6K8
C120
4n7(M)
R194 6K8
VR37B 500KC
VR37A 500KC C124
2n7(M)
MID
R195 6K8
R217 5K1
5 67
U8B 4580M
VR39A D10K
R225 12K
C56 22P
C92
47uF/25V
LEVEL
2
1 3
SW17A
PS-22E85L
MUTE
R224 15K0
C91
47uF/25V
R178 27K R179 27K
LEFT BUS
RIGHT BUS
PAN
VR40 B5K
R232 2K7 R233 2K7
LEFT-BUS RIGHT-BUS
R184 17K4
AUX1
VR41 W50K
AUX1
VR42 W50K
R185 17K4 AUX2
AUX2
AUX SEND
AUX1 AUX2
AUX GND AUX GND
2
1 3
SW18A PS-22E85L
5
4 6
SW18B PS-22E85L
2
1 3
SW19A PS-22E85L
5
4 6
SW19B PS-22E85L
R186 17K4
AUX3
VR43 W50K
AUX3 EXT
VR44 W50K
R187 17K4 AUX4 INT
AUX4
AUX GND AUX GND
AUX1 AUX2 AUX3 AUX
R188 5K1 A/PFL L R189 5K1 A/PFL R
2
1 3
SW20A PS-22E85L
PFL
A/PFL L A/PFL R
R141 20K
R142 20K R143 20K R144 20K
C153 100uF/63V

1 2 3 5 6 7 8 9 10 11 12
A B C D
12
111098765321
D
C B A
87
9
SW36C
PS-42E85L
LD19 GRN
87
9
SW26C
PS-42E85L
87
9
SW25C
PS-42E85L
17V
LD5 YEL LD6 GRN
87
9
SW30C
PS-42E85L
87
9
SW29C
PS-42E85L
LD7 YEL LD8 GRN
87
9
SW34C
PS-42E85L
LD9 GRN LD10 GRN
87
9
SW35C
PS-42E85L
LD11 GRN
87
9
SW33C
PS-42E85L
MUTE
Q1 BC337
R73 20K
17V
D2 LL4148 D3 LL4148
-17V
R321 100R
-17V
3c 5e 1a
d
2b
X1 90 STEREO JACK
R1 10K 1%
R4 10K 1%
C22 22PF
C23
22PF
R8 10K 1%
31
U20A 4580M
R6
10K 1%
CH 9/10 LEFT (MONO)
3c 5e 1a
d
2b
X2 90 STEREO JACK
R2
10K 1%
R3 10K 1% C21
22PF
C24 22PF
R7 10K 1%
57
U20B
4580M
R5
10K 1%
CH 9/10 RIGHT
C1 47uF/35V C2
47uF/35V
C3 47uF/35V C4
47uF/35V
17V
-17V
C170 100n
C169
100n
8
U20C
4580M
R42 27K
R49
2K7
R44 27K
R60 20K
VR50A W50K
3 21
U21A
4580M
STEREO
GAIN
+20dB
20dB
R41
27K
R51 2K7
R43 27K
R62
20K
VR50B
W50K
5 67
U21B
4580M
C41 22P
C81
100uF/16V
C80 100uF/16V
C85
47uF/25V
C84
47uF/25V
C42
22P
EQ HI (12KHz)
VR51A
B50K
R192 6K8
VR54A
B50K
R190 6K8
LO(80Hz)
R210 47K
3 21
U22A
4580M
R200
1M
C45
22P
R89
10K
VR52A
B50K
R182
22K MID-LO(500Hz)
R162
1K8
C141
12n(M)
R164
1K8 C163
47n(M)
C155
3.3n(M)
C151
1n(M)
C143
12n(M)
C86
47uF/25V
5 67
U22B
4580M
R186
200K
C43 22P
R178
220K
R168
1K8
VR53A
B50K
R166 1K8
HI-MID(3KHz)
R206
12K
C157
3.3n(M)
R198 1M
EQ HI (12KHz)
VR51B
B50K
R193 6K8
VR54B
B50K
R191 6K8
LO(80Hz)
R211 47K
5 67
U23B
4580M
R201
1M
C46
22P
R90
10K
VR52B
B50K
R183
22K MID-LO(500Hz)
R163
1K8
C142
12n(M)
R165 1K8 C164
47n(M)
C156
3.3n(M)
C152
1n(M)
C144 12n(M)
C87
47uF/25V
3 21
U23A
4580M
R187
200K
C44 22P
R179
220K
R169
1K8
VR53B
B50K
R167 1K8
HI-MID(3KHz)
R207
12K
C158
3.3n(M)
R199 1M
R293
5K1
R215 47K0
R217
6K80
TR6
3904
TR5
3904
R219 1K50
17V
LD3 RED
R230
5K1
3 21
U24A
4580M
VR55A
D10K
PEAK
R224 12K
C48
22P
C91
47uF/25V
LEVEL
PGND
R91
10K
R92
10K
R229
5K1
5 67
U24B
4580M
VR55B D10K
R223
12K
C47
22P
C90
47uF/25V
LEVEL R98
10K
R97 10K
R52 2K7
VR56 B5K
R53 2K7
R221 15K0 R222 15K0
R88 10K
R87 10K
R156
22K
R58 68K
R158 6K80
TR2 3904
TR1 3904
R160
1K50 17V
LD1 YEL
LEVEL SET
C88
47uF/25V
C89
47uF/25V
PGND
2
1 3
SW25A PS-42E85L MUTE
R273 17K4
AUX1
VR57 W50K
R237 27K R238 27K
LEFT-BUS
RIGHT-BUS
AUX1
R235 5K1 A/PFL L
VR58 W50K
R274 17K4 AUX2
AUX2
AUX SEND
AUX1 AUX2
AUX GND AUX GND
2
1 3
SW27A PS-22E85L
5
6
SW27B PS-22E85L
2
1 3
SW28A PS-22E85L
5
6
SW28B PS-22E85L
R275 17K4
AUX3
VR59 W50K
AUX3 EXT
VR60 W50K
R276 17K4 AUX4 INT
AUX
AUX GND AUX GND
R236 5K1 A/PFL R
2
1 3
SW26A PS-42E85L
LEFT-BUS RIGHT-BUS AUX1 AUX2 AUX3 AUX
A PFL L A PFL R
5
6
SW25B PS-42E85L
R93
10K
R94
10K
5
6
SW26B PS-42E85L
R95
10K
R96
10K
R100
10K
R99 10K
R102
10K
R101 10K
R104
10K
R103 10K
BAL
C172 100n
C171
100n
8
U21C
4580M
C174 100n
C173
100n
8
U22C
4580M
C176 100n
C175
100n
8
U23C
4580M
C178 100n
C177
100n
8
U24C
4580M
C180 100n
C179
100n
8
U25C
4580M
C182 100n
C181
100n
8
U26C
4580M
C184 100n
C183
100n
8
U27C
4580M
C186 100n
C185
100n
8
U28C
4580M
C188 100n
C187
100n
8
U29C
4580M
3c 5e 1a
d
2b
X3 90 STEREO JACK
R9 10K 1%
R12 10K 1%
C26 22PF
C27
22PF
R16 10K 1%
31
U25A 4580M
R14
10K 1%
CH 11/12 LEFT (MONO)
3c 5e 1a
d
2b
X4 90 STEREO JACK
R10
10K 1%
R11 10K 1% C25
22PF
C28 22PF
R15 10K 1%
57
U25B
4580M
R13
10K 1%
CH 11/12 RIGHT
C5 47uF/35V C6
47uF/35V
C7 47uF/35V C8
47uF/35V
R46 27K
R54
2K7
R48 27K
R63 20K
VR61A W50K
3 21
U26A
4580M
STEREO
GAIN
+20dB
20dB
R45
27K
R55 2K7
R47 27K
R64
20K
VR61B
W50K
5 67
U26B
4580M
C49 22P
C83
100uF/16V
C82 100uF/16V
C93
47uF/25V
C92
47uF/25V
C50
22P
EQ HI (12KHz)
VR62A
B50K
R196 6K8
VR65A
B50K
R194 6K8
LO(80Hz)
R212 47K
3 21
U27A
4580M
R204
1M
C53
22P
R107 10K
VR63A
B50K
R184
22K MID-LO(500Hz)
R170
1K8
C145
12n(M)
R172
1K8 C165
47n(M)
C159
3.3n(M)
C153
1n(M)
C146 12n(M)
C94
47uF/25V
5 67
U27B
4580M
R188
200K
C51 22P
R180 220K
R175
1K8
VR64A
B50K
R173 1K8
HI-MID(3KHz)
R208
12K
C161
3.3n(M)
R202 1M
EQ HI (12KHz)
VR62B
B50K
R197 6K8
VR65B
B50K
R195 6K8
LO(80Hz)
R213 47K
5 67
U28B
4580M
R205
1M
C54
22P
R108
10K
VR63B
B50K
R185 22K MID-LO(500Hz)
R171
1K8
C148
12n(M)
R177
1K8 C166
47n(M)
C160
3.3n(M)
C154
1n(M)
C147
12n(M)
C95
47uF/25V
3 21
U28A
4580M
R189
200K
C52
22P
R181
220K
R176
1K8
VR64B
B50K
R174 1K8
HI-MID(3KHz)
R209 12K
C162
3.3n(M)
R203 1M
R294
5K1
R216 47K0
R218
6K80
TR8
3904
TR7
3904
R220 1K50
17V
LD4 RED
R232
5K1
3 21
U29A
4580M
VR66A
D10K
PEAK
R228 12K
C56
22P
C99
47uF/25V
LEVEL
PGND
R109
10K
R110
10K
R231
5K1
5 67
U29B
4580M
VR66B D10K
R227
12K
C55
22P
C98
47uF/25V
LEVEL R116
10K
R115 10K
R56 2K7
VR67 B5K
R57 2K7
R225 15K0 R226 15K0
R106 10K
R105 10K
R157
22K
R59 68K
R159 6K80
TR3 3904
TR4 3904
R161
1K50 17V
LD2 YEL
LEVEL SET
C96
47uF/25V
C97
47uF/25V
PGND
2
1 3
SW29A PS-42E85L MUTE
R277 17K4
AUX1
VR68 W50K
R244 27K R245 27K
LEFT-BUS
RIGHT-BUS
AUX1
R243 5K1 A/PFL L
VR69 W50K
R278 17K4 AUX2
AUX2
AUX SEND
AUX1 AUX2
AUX GND AUX GND
2
1 3
SW31A PS-22E85L
5
6
SW31B PS-22E85L
2
1 3
SW32A PS-22E85L
5
6
SW32B PS-22E85L
R279 17K4
AUX3
VR70 W50K
AUX3 EXT
VR71 W50K
R286 17K4 AUX4 INT
AUX
AUX GND AUX GND
R252 5K1 A/PFL R
2
1 3
SW30A PS-42E85L
LEFT-BUS RIGHT-BUS AUX1 AUX2 AUX3 AUX
A PFL L A PFL R
5
6
SW29B PS-42E85L
R111
10K
R112
10K
5
6
SW30B PS-42E85L
R113
10K
R114
10K
R118
10K
R117 10K
R120
10K
R119 10K
R122
10K
R121 10K
BAL
3c 5e 1a
d
2b
X5 90 STEREO JACK
R17 10K 1%
R20 10K 1%
C30 22PF
C31
22PF
R24 10K 1%
31
U30A 4580M
R22
10K 1%
ST SUB IN1 LEFT (MONO)
3c 5e 1a
d
2b
X6 90 STEREO JACK
R18
10K 1%
R19 10K 1% C29
22PF
C32 22PF
R23 10K 1%
57
U30B
4580M
R21
10K 1%
ST SUB IN1 RIGHT
C9 47uF/35V C10
47uF/35V
C11 47uF/35V C12
47uF/35V
R65
20K
C100
47uF/25V
R66
20K
C101
47uF/25V
R124 10K
R123 10K
R126 10K
R125
0K
R128 10K
R127 10K
VR72 W50K
AUX GND
VR73 W50K
AUX GND
R281 17K4
AUX3
VR74 W50K
AUX GND AUX3
R280 17K4
R282 17K4
AUX1 AUX2
AUX1 AUX2
R250 5K1 A/PFL L R251 5K1 A PFL R
A/PFL L A/PFL R
C190 100n
C189
100n
8
U30C
4580M
C106
47uF/25V
R234
10K
3 21
U33A
4580M
R304 10K
C168
22P
C109
47uF/25V
R71
20K
R307
17K4
C107
47uF/25V
R233
10K
5 67
U33B
4580M
R305
10K
C167
22P
C108
47uF/25V
R72
20K
R306
17K4
C232 100P
C233
100P
2TK-IN-R
VR84A W50K VR84B W50K
2TK IN
C192 100n
C191
100n
8
U31C
4580M
R257 5K1 A/PFL L R258 5K1 A/PFL R
2
1 3
SW36A PS-42E85L A/PFL L
A/PFL R
5
6SW36B
PS-42E85L
LEFT-BUS
RIGHT-BUS
LEFT-BU RIGHT-BUS
VR75A W50K
R296 17K4
LEFT-BUS
VR75B W50K
R297 17K4
RIGHT-BUS
LEFT-BUS
RIGHT-BUS
2
3
SW33A PS-42E85L
5
6SW33B
PS-42E85L
3c 5e 1a
d
2b
X9 90 STEREO JACK
R33 10K 1%
R36 10K 1%
C38 22PF
C39
22PF
R40 10K 1%
31
U31A 4580M
R38
10K 1%
ST SUB IN2 LEFT (MONO)
3c 5e 1a
d
2b
X10 90 STEREO JACK
R34
10K 1%
R35 10K 1% C37
22PF
C40 22PF
R39 10K 1%
57
U31B
4580M
R37
10K 1%
ST SUB IN2 RIGHT
C17 47uF/35V C18
47uF/35V
C19 47uF/35V C20
47uF/35V
R69
20K
C104
47uF/25V
R70
20K
C105
47uF/25V
R136 10K
R135 10K
R138 10K
R137 10K
R140 10K
R139 10K
VR76 W50K
AUX GND
VR77 W50K
AUX GND
R288 17K4
AUX3
VR78 W50K
AUX GND AUX3
R287 17K4
R289 17K4
AUX1 AUX2
AUX1 AUX2
R255 5K1 A/PFL L R256 5K1 A PFL R
A/PFL L A/PFL R
VR79A W50K
R300 17K4
LEFT-BUS
VR79B W50K
R301 17K4
RIGHT-BUS
LEFT-BUS
RIGHT-BUS
2
3
SW34A PS-42E85L
5
6SW34B
PS-42E85L
3c 5e 1a
d
2b
X7 90 STEREO JACK
R25 10K 1%
R28 10K 1%
C34 22PF
C35
22PF
R32 10K 1%
3 21
U32A 4580M
R30
10K 1%
ST SUB IN3 LEFT (MONO)
3c 5e 1a
d
2b
X8 90 STEREO JACK
R26
10K 1%
R27 10K 1% C33
22PF
C36 22PF
R31 10K 1%
5 67
U32B
4580M
R29
10K 1%
ST SUB IN3 RIGHT
C13 47uF/35V C14
47uF/35V
C15 47uF/35V C16
47uF/35V
R67
20K
C102
47uF/25V
R68
20K
C103
47uF/25V
R130 10K
R129 10K
R132 10K
R131 10K
R134 10K
R133 10K
VR80 W50K
AUX GND
VR81 W50K
AUX GND
R284 17K4
AUX3
VR82 W50K
AUX GND AUX3
R283 17K4
R285 17K4
AUX1 AUX2
AUX1 AUX2
R253 5K1 A/PFL L R254 5K1 A/PFL R
A/PFL L A/PFL R
VR83A W50K
R298 17K4
LEFT-BUS
VR83B W50K
R299 17K4
RIGHT-BUS
LEFT-BUS
RIGHT-BUS
2
1 3
SW35A PS-42E85L
5
6SW35B
PS-42E85L
C194 100n
C193
100n
8
U32C
4580M
C196 100n
C195
100n
8
U33C
4580M
PFL PFL
PFL PFL
PFL
PFL
APM STEREO BOARD(1/3)
ST ST
ST
ST
R319
1K0
R320
1K0
L(WHITE)
R(RED)
TAPE IN TAPE OUT
1 2 5
3
6
X11
SCP6873NS3232
2TK-OUT-R 2TK-OUT-L
2TK-IN-L
APM-120 APM STEREO B OARD S01 APM-120
APM STEREO B OARD S02
87
9
SW47C
PS-42E85L
LD18 GRN
87
9
SW38C
PS-42E85L
LD12 GRN
56
SW41B
PS-22E85L
87
9
SW39C
PS-42E85L
LD13 GRN LD14 GRN
56
SW45B
PS-22E85L
LD15 GRN LD16 GRN
56
SW46B
PS-22E85L
LD17 GRN
56
SW44B
PS-22E85L
R61 20K
R50 20K
R239 20K
R240
20K
2TK-OUT-R 2TK-OUT-L
R486
10K
R485
10K
R484
10K
R487
10K
R488 0R