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NXAMP 4X4
Nexo NXAMP 4X4 Service Manual
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NXAMP4x4
8
BA
C
D
E
F
G
H
2
1
3
4
5
28CA1
-20
0
10221
10-50
Input_Amp
(PCB INANH)
Input_VR
(PCB Control)
ADC buffer
(PCB Control)
-14dB
Fixed Gain
0.25dB step
Variable Gain
+6dB
Fixed Gain
NXAMP4x4 LEVEL DIAGRAM
CS3318
3
12
Maximum Input
Voltage
+28.0dBu
CS4272 Codec +DSP
Digital Domain
DAC buffer
(PCB Control)
CS3318
Output_VR
(PCB Control)
Power_Amp
(PCB PAANH)
-0.4dB
Fixed Gain
+37dB
Fixed Gain
0.25dB step
Variable Gain
MAXIMUM
LEVEL
+43.8dBu
+6.8dBu
+5.8dBu
+6.2dBu
-0.4dB
+1dB
-96dB
+7.5dBu
+1.5dBu
-4.0dBu
+14.0dBu
-14.0dB
-12.5dB
+5.5dB
+6.0dB
Note:
The solid line shows the gain structure in the analog test mode of the test program.
This level diagram is for the purpose of circuit design only.
The actual gain structure will depend on the firmware that is used.
The broken line shows an example in the setting that allows the maximum input signal level
Sensitivity
+10.0dBu
■
BL
OCK DIA
GRAM 5/5
（ブロックダイアグラム5/5）
137
139
Table of Contents
Contents
1
Connecting the Plug and Cord
2
Panel Layout
3
Front Panel
3
Rear Panel
3
Circuit Board Layout
4
Service Precautions
5
Safety Measures
5
PSANH Circuit Board
5
PSANH Circuit Diagram
6
Overall Assembly Wiring
7
Wiring of the PN-AN Circuit Board
7
Wiring of the Power Switch
8
Wiring of the FAN
9
Attaching of the Support Cushion
9
CHN Destination
10
U/J Destination
10
Wiring of the AC-INLET
10
Wiring of the PA Unit
12
Wiring and Fastening
14
Way of Fastening Wire
14
Change of the Destination
21
Insulation Distance between Wire (WK17110)
22
Adhesive Cloth Tape
22
Confirmation of Switch LED Lighting
23
Method of Fixing PN FFC Assembly
24
Disassembly Procedures
25
Top Cover and NX-DFLT Card
25
PSANHA Circuit Board
27
OUTANH Circuit Board
28
PSANHB Circuit Board
29
INANH Circuit Board
30
RS232-GPI Circuit Board
30
Upper Left (CH1) PA Unit
31
Upper Right (CH2) PA Unit
31
Lower Left (CH3) PA Unit
32
Lower Right (CH4) PA Unit
32
Front Panel Assembly
33
PN-AN Circuit Board
33
Upper Left DC Fan
34
Upper Right DC Fan
34
Lower Left DC Fan
35
Lower Right DC Fan
35
Power Switch
36
Lsi Pin Description
37
IC Block Diagram
38
Sn74Abt245Bnsr (Xu009A0)
42
Circuit Boards
44
CONTROL Circuit Board
46
PAANH Circuit Board
56
PSANHA, PSANHB Circuit Board
58
Test Connection Image
64
Test Program
64
Required Items
64
Operation
65
Entry of the Test Program
65
ENCODER Test
65
Executing the Test and Judgment Display
65
RS-232C Test
66
GPI Test
66
LCD Test
66
Lighting Order
66
PORT Test
67
DSP Test
67
12C Test
67
WORD CLOCK Test
67
FLASH Test
68
SLOT Test
68
FAN Test
68
ATTENUATION Test
68
Calibration
69
BRIDGE Test
69
ANALOG Test
69
STANDBY Test
70
Quit
70
Inspections
78
Inspection with Ordinary Mode
79
Power on Sequence
79
Power Consumption When Idling
79
PEAK Indicator
79
Link out
80
Efficiency
80
Frequency Response
80
Distortion
80
Channel Separation
81
Output Noise Level
81
Stability
81
Confirming Operation of NX-DFLT Card
82
Gain
82
Inspection with BRIDGE Mode
82
Updating the Firmware
88
Downloading and Installing the Software for Update
88
Connection
88
Updating Operation
88
JTAG Programmer Screen
89
JTAG-ISP Operations Screen
89
Hardware Setting Screen
89
Table of Contents
92
Parts List
92
Warning
92
Overall Assembly
93
Pa Unit
98
Lcd Assembly
100
Details on PSANHB Circuit Board
101
Details on PSANHA Circuit Board
101
Details on PAANH Circuit Board
101
Locations of Heat Sink Units
101
Heat Sink Unit L100
102
Heat Sink Unit L100
103
Heat Sink Unit L60
104
Heat Sink Unit L60
105
Heat Sink Unit L50
106
Heat Sink Unit L50
107
Heat Sink Unit Osh
108
Heat Sink Unit
109
Heat Sink Unit Mp-5
110
Electrical Parts
111
Block Diagram
131
Circuit Diagram
131
Notation for Circuit Diagrams
131
IC & Diode Figures
132
Wiring Diagram
133
Block Diagram
134
Block Diagram
135
Block Diagram
136
Block Diagram
137
Block Diagram
138
Nxamp4X4 LEVEL DIAGRAM
138
Parts List
139
Parts List
140
Parts List
141
Parts List
142
Parts List
143
Parts List
144
Inanh
145
Parts List
145
Outanh
146
Parts List
146
Pn-An
147
Parts List
147
Parts List
148
Rs232-Gpi
148
Opt-An, Nx-Dflt
149
Parts List
149
Paanh
150
Parts List
150
Psanha/Psanhb
151
Parts List
151
Parts List
152
Parts List
153
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Nexo NXAMP 4X4 Specifications
General
Brand
Nexo
Model
NXAMP 4X4
Category
Recording Equipment
Language
English
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