PL3 Series Service Manual 3
TD-000274-00 Rev. A
Table of Contents
Tables and Figures ........................................................................................................................................................................ 4
Specifications................................................................................................................................................................................ 6
1. Introduction ................................................................................................................................................................................ 7
1.1 Restriction of Hazardous Substances Directive (RoHS) ............................................................................................................................................. 7
1.2 Service bulletins and updates .................................................................................................................................................................................... 7
1.3 The well-equipped service bench .............................................................................................................................................................................. 7
1.4 Working with surface-mount components................................................................................................................................................................. 8
1.5 PL380 Service Fixture ............................................................................................................................................................................................... 10
2. Technical Descriptions and Testing .................................................................................................................................... 14
2.1 PL380 Circuit Description ......................................................................................................................................................................................... 14
2.2 PL380 Major Circuit Blocks ...................................................................................................................................................................................... 16
2.3 PL380 Test Procedure ............................................................................................................................................................................................... 21
2.4 PL340 Test and Calibration Procedure ..................................................................................................................................................................... 24
2.5 PL325 Test and Calibration Procedure ..................................................................................................................................................................... 27
3. Troubleshooting ....................................................................................................................................................................... 31
3.1 PL380: Symptoms, causes, and remedies ................................................................................................................................................................ 31
3.2 PL325 and PL340: Symptoms, causes, and remedies .............................................................................................................................................. 39
PLC Power Supply Restoration Kit ................................................................................................................................................................................. 43
4. Printed Circuit Boards............................................................................................................................................................ 53
4.1 PL325 and PL340 Amplifier ...................................................................................................................................................................................... 53
Main module circuit board assembly ............................................................................................................................................................................................................ 53
Input module circuit board assembly ............................................................................................................................................................................................................ 56
4.2 PL380 Amplifier ........................................................................................................................................................................................................ 58
Main module circuit board assembly ............................................................................................................................................................................................................ 58
5. Schematic Diagrams .............................................................................................................................................................. 64
5.1 PL325 Schematics .................................................................................................................................................................................................... 64
5.2 PL340 Schematics .................................................................................................................................................................................................... 72
5.3 PL380 Schematics .................................................................................................................................................................................................... 80
6. Replacement parts .................................................................................................................................................................. 89
6.1 Semiconductor package descriptions and pinouts .................................................................................................................................................. 89
6.2 PL325 parts and assemblies ..................................................................................................................................................................................... 93
PL325 Power Amplifier (120V) (QSC part # FG-032500-00) ......................................................................................................................................................................... 93
PL325 Power Amplifier (100V) (QSC part # FG-032500-01) .......................................................................................................................................................................... 93
PL325 Power Amplifier (230V) (QSC part # FG-032500-02) ......................................................................................................................................................................... 93
Chassis Assembly PL325 (120V) (QSC part # WP-032500-00) ...................................................................................................................................................................... 93
Chassis Assembly PL325 (100V) (QSC part # WP-032500-01) ...................................................................................................................................................................... 94
Chassis Assembly PL325 (230V) (QSC part # WP-032500-02) ...................................................................................................................................................................... 95
PCB Assembly PL325 (120V) (QSC part # WP-032501-00) ............................................................................................................................................................................ 95
PCB Assembly PL325 (100V) (QSC part # WP-032501-01) ............................................................................................................................................................................ 98
PCB Assembly PL325 (230V) (QSC part # WP-032501-02) .......................................................................................................................................................................... 101
Input Assembly PL325 (QSC part # WP-032502-00) ................................................................................................................................................................................... 105
6.3 PL340 parts and assemblies ................................................................................................................................................................................... 106
PL340 Power Amplifier (120V) (QSC part # FG-034000-00) ........................................................................................................................................................................ 106
PL340 Power Amplifier (100V) (QSC part # FG-034000-01) ........................................................................................................................................................................ 106
PL340 Power Amplifier (230V) (QSC part # FG-034000-02) ........................................................................................................................................................................ 106
Chassis Assembly PL340 (120V) (QSC part # WP-034000-00) .................................................................................................................................................................... 106
Chassis Assembly PL340 (100V) (QSC part # WP-034000-01) .................................................................................................................................................................... 107
Chassis Assembly PL340 (230V) (QSC part # WP-034000-02) .................................................................................................................................................................... 108
PCB Assembly PL340 (120V) (QSC part # WP-034001-00) .......................................................................................................................................................................... 108
PCB Assembly PL340 (100V) (QSC part # WP-034001-01) .......................................................................................................................................................................... 112
PCB Assembly PL340 (230V) (QSC part # WP-034001-02) .......................................................................................................................................................................... 115
Input Assembly PL340 (QSC part # WP-034002-00) ................................................................................................................................................................................... 118
6.4 PL380 parts and assemblies ................................................................................................................................................................................... 120
PL380 Power Amplifier (120V) (QSC part # FG-038000-00) ........................................................................................................................................................................ 120
PL380 Power Amplifier (100V) (QSC part # FG-038000-01) ........................................................................................................................................................................ 120
PL380 Power Amplifier (230V) (QSC part # FG-038000-02) ........................................................................................................................................................................ 120
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