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Manuals and User Guides for QSC PowerLight3 Series. We have
1
QSC PowerLight3 Series manual available for free PDF download: Technical & Service Manual
QSC PowerLight3 Series Technical & Service Manual (154 pages)
PowerLight 3 Series
Brand:
QSC
| Category:
Amplifier
| Size: 16.83 MB
Table of Contents
PL325 and PL340 Amplifier, Rear View
4
PL380 Amplifier, Rear View
4
Table of Contents
5
Tables and Figures
6
Specifications
8
1 Introduction
9
Restriction of Hazardous Substances Directive (Rohs)
9
Service Bulletins and Updates
9
The Well-Equipped Service Bench
9
Table 1.1. Load Resistor Bank Switch Truth Table
9
Figure 1.1. Load Resistor Bank
9
Working with Surface-Mount Components
10
Figure 1.2. Use Two Irons
10
Figure 1.3. Soak up Solder
10
Figure 1.4. Apply New Solder
10
Figure 1.5. Place Component
10
Figure 1.6. Solder One End of the Component
10
Figure 1.7. Solder Other End
10
PL380 Service Fixture
12
Figure 1.8. the PL380 Service Fixture
12
Figure 1.9. Locations of Test Point a and Test Point B
12
Figure 1.11. Connecting the Hookup Leads
13
Figure 1.13. Proper IGBT Drive Signals (with Chassis Ground Reference )
15
Figure 1.14. Proper FET Gate Drive Signals with Fets Installed (with Chassis Ground Reference)
15
2 Technical Descriptions and Testing
16
PL380 Circuit Description
16
Protection Systems
17
Output Connections
17
Input Connections
17
PL380 Major Circuit Blocks
18
PL380 Test Procedure
23
Figure 2.1. Signal with 250 Khz Switching Noise
23
Figure 2.2. Signal with Switching Noise Filtered out
23
Figure 2.3. Burst Sine Wave Signal for 2 Ω Power Testing
23
PL340 Test and Calibration Procedure
26
Figure 2.4. Noise and Distortion Residual with Bias Properly Set
27
PL325 Test and Calibration Procedure
29
3 Troubleshooting
33
PL380: Symptoms, Causes, and Remedies
33
Figure 3.1 IGBT Gate Drive Waveforms
34
Figure 3.2 FET Gate Drive Waveforms
35
Figure 3.3 Dead Time between One Pulse Turning off and the Other Turning on Should be about 20–30 Ns at the 5 V Level
35
Figure 3.4 the Clock Drive Logic Signals
35
Figure 3.5 the Power Supply Sync Pulse
36
Figure 3.6 Triangle Wave at Comparator Inputs (Pin 2 of U8 and U28)
37
Figure 3.7 Triangle Wave with Supply Rails Energized
37
PL325 and PL340: Symptoms, Causes, and Remedies
41
Figure 3.8. Switching Pulse at Node N401 (Pin 3 of U19)
41
Figure 3.9: Switching Signal with Dead Time at Nodes N397 and 398 (Pins 11 and 14 of U19)
42
Figure 3.10. Typical Crossover Residual from Distortion Analyzer Output
43
PLC Power Supply Restoration Kit
45
Figure 3.11. Identify Damaged Transistors by Measuring Resistance Across the Collector and Emitter
45
Table 3.1. Clamping Voltage Troubleshooting
46
Table 3.2. Troubleshooting Clamp Malfunctions
47
Figure 3.12. the Overcurrent Detection Circuit for Power Supply Cutback
48
Table 3.3. Troubleshooting Clamp Transistors
48
Table 3.4. Troubleshooting Short Circuit Cutback Clamping
49
Figure 3.13. Output Signal and Positive Rail Steps
50
Figure 3.14. Output Signal and Negative Rail Steps
50
PL325 and PL340 Main Circuit Board, Top Layer
56
PL325 and PL340 Main Circuit Board, Bottom Layer, Mirror Image
57
PL325 and PL340 Input Board, Top Layer
58
PL325 and PL340 Input Board, Bottom Layer, Mirror Image
59
Main Module Circuit Board Assembly
60
PL380 Amplifier
60
4 Printed Circuit Boards
60
PL380 Main Circuit Board, with Major Circuit Sections Shown
60
PL380 Main Circuit Board, Detailed View
61
PL380 Input Board, Main Circuit Blocks Shown
61
PL380 Main Circuit Board, Top Layer
62
PL380 Main Circuit Board, Mid1 Layer
63
PL380 Main Circuit Board, Mid2 Layer
64
PL380 Main Circuit Board, Bottom Layer
65
5 Schematic Diagrams
66
PL325 Schematics
66
PL325 Schematic Notes
66
Schematic Sheet INPUT, PL325
67
PL325 Wiring Diagram
68
PL325 Schematic Guide
69
Schematic Sheet AMP CH-A, PL325
70
Schematic Sheet AMP CH-B, PL325
71
Schematic Sheet PROTECT/CONTROL, PL325
72
Schematic Sheet POWER SUPPLY, PL325
73
PL340 Schematics
74
PL340 Schematic Notes
74
Schematic Sheet INPUT, PL340
75
PL340 Wiring Diagram
76
PL340 Schematic Guide
77
Schematic Sheet AMP CH-A, PL340
78
Schematic Sheet AMP CH-B, PL340
79
Schematic Sheet PROTECT/CONTROL, PL340
80
Schematic Sheet POWER SUPPLY, PL340
81
PL380 Schematics
82
PL380 Schematic Notes
82
PL380 Wiring Diagram
83
PL380 Schematic Guide
84
Schematic Sheet AMP CH-A, PL380 through January 2008
85
Schematic Sheet PROTECT/CONTROL, PL380
86
Schematic Sheet AMP CH-B, PL380 through January 2008
87
Schematic Sheet POWER SUPPLY, PL380 through January 2008
88
Schematic Sheet INPUT, PL380 through January 2008
89
Schematic Sheet AMP CH-A, PL380 from February 2008
90
Schematic Sheet AMP CH-B, PL380 from February 2008
91
Schematic Sheet POWER SUPPLY, PL380 from February 2008
92
Schematic Sheet INPUT, PL380 from February 2008
93
6 Replacement Parts
95
Semiconductor Package Descriptions and Pinouts
95
PL325 Parts and Assemblies
99
PL325 Power Amplifier (120V) (QSC Part # FG-032500-00)
99
PL325 Power Amplifier (100V) (QSC Part # FG-032500-01)
99
PL325 Power Amplifier (230V) (QSC Part # FG-032500-02)
99
Chassis Assembly PL325 (120V) (QSC Part # WP-032500-00)
99
Chassis Assembly PL325 (100V) (QSC Part # WP-032500-01)
100
Chassis Assembly PL325 (230V) (QSC Part # WP-032500-02)
101
PCB Assembly PL325 (120V) (QSC Part # WP-032501-00)
101
PCB Assembly PL325 (100V) (QSC Part # WP-032501-01)
104
PCB Assembly PL325 (230V) (QSC Part # WP-032501-02)
108
Input Assembly PL325 (QSC Part # WP-032502-00)
111
PL340 Parts and Assemblies
112
PL340 Power Amplifier (120V) (QSC Part # FG-034000-00)
112
PL340 Power Amplifier (100V) (QSC Part # FG-034000-01)
112
PL340 Power Amplifier (230V) (QSC Part # FG-034000-02)
112
Chassis Assembly PL340 (120V) (QSC Part # WP-034000-00)
112
Chassis Assembly PL340 (100V) (QSC Part # WP-034000-01)
113
Chassis Assembly PL340 (230V) (QSC Part # WP-034000-02)
114
PCB Assembly PL340 (120V) (QSC Part # WP-034001-00)
114
PCB Assembly PL340 (100V) (QSC Part # WP-034001-01)
118
PCB Assembly PL340 (230V) (QSC Part # WP-034001-02)
121
Input Assembly PL340 (QSC Part # WP-034002-00)
124
PL380 Parts and Assemblies
126
PL380 Power Amplifier (120V) (QSC Part # FG-038000-00)
126
PL380 Power Amplifier (100V) (QSC Part # FG-038000-01)
126
PL380 Power Amplifier (230V) (QSC Part # FG-038000-02)
126
Chassis Assembly PL380 (120V) (QSC Part # WP-038000-00)
126
Chassis Assembly PL380 (100V) (QSC Part # WP-038000-01)
127
Chassis Assembly PL380 (230V) (QSC Part # WP-038000-02)
128
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