QSC-DCA1222-pwr-sm 电路图 维修手册.pdf

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1、Product Model: DCA 1222, DCA 1622, DCA 2422, DCA 3022, DCA 3422 Document #: TD-000495-00 Initial Release: April 2015 Revised Release: Revision: A Service Manual QSC Audio Products, LLC Costa Mesa, California, USA DCA 2 Channel Series RadioFans.CN 收音机爱 好者资料库 2 QSC Audio Products, LLC RadioFans.CN 收音机

2、爱 好者资料库 3 TD-000495-00 DCA 2 Channel Series Service Manual Table of Contents 1. Introduction .5 1.1 Restriction of Hazardous Substances Directive (RoHS) .5 1.2 Revision history .5 1.3 Service bulletins .5 1.4 Serial Numbers .5 1.5 The well-equipped service bench .6 2. Product specification and image

3、s .7 3. Operational description .8 3.1 Series description .8 3.2 Circuit descriptions .8 4. Testing .19 4.1 Requirements .19 4.2 Setup .19 4.3 Test procedures .20 5. Troubleshooting guide.23 5.1 General tips and tricks.23 5.2 Intermittent signal from gain pots .26 5.3 Main PSU damage (IGBTs or flyba

4、ck diodes blown) .26 5.4 Shorted output transistors in amplifier section .27 5.5 Step circuit failure .27 5.6 Leaky transistors in amplifier current limit circuit .28 5.7 Weak capacitor C107 in PSU .29 5.8 Input stage damage .29 5.9 Protect signal transistors shorted .30 5.10 Zobel resistors burned

5、.30 6. Service updates .31 7. Schematics .32 8. Assembly drawings .33 8.1 DCA 2-CH chassis assembly .33 8.2 DCA 2-CH PCB assembly .36 9. Replacement parts .37 9.1 Amplifier module replacement summary .37 9.2 SG-000060-00, PLC power supply restoration kit .37 9.3 SG-000568-TS, PLC housekeeping (bias)

6、 rebuild kit .37 9.4 Finished Good (all DCA 2-channel models) .38 9.5 WP-000080-00, ship kit DCA 2CH .38 9.6 Chassis assembly, (all DCA 2-channel models) .38 9.7 WP-001223-00, DCA 1222 PCB assembly .40 9.8 WP-001623-00, DCA 1622 PCB assembly .45 9.9 WP-002423-00, DCA 2422 PCB assembly .50 9.10 WP-00

7、3023-00, DCA 3022 PCB assembly .55 9.11 WP-003423-00, DCA 3422 PCB assembly .60 RadioFans.CN 收音机爱 好者资料库 4 QSC Audio Products, LLC QSC Audio Products, LLC Technical Services Group 1665 MacArthur Blvd. Costa Mesa CA 92626 USA DCA 2 Channel Series Amplifiers Service Manual Copyright 2014 by QSC Audio P

8、roducts, LLC. All Rights Reserved. QSC and the QSC logo are trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark Office and other coun- tries. Patents may apply or be pending. Windows is a registered trademark of Microsoft Corp. Audio Precision is a registered trademark of Audio Pr

9、ecision, Inc. All other trademarks are property of their respective owners. +1 (714) 957-7150 1-800 QSC AUDIO (USA only) +1 (714) 754-6173 (fax) (main web site) (Technical Service Group web site) (parts and accessories sales) 5 TD-000495-00 DCA 2 Channel Series Service Manual 1. Introduction 1.1 Res

10、triction of Hazardous Substances Directive (RoHS) QSC DCA series amplifier products are manufactured to conform to the European Unions RoHS Directive, which reduces the amount of hazardous substances allowed in products for sale within its member nations. In electronic equipment such as audio proces

11、sors, this applies primarily to certain toxic heavy metals, such as lead, which may be present in electronic components, solder, and other parts. RoHS-compliant materials When servicing RoHS-compliant electronic products, it is important for the service technician to use only RoHS-compliant componen

12、ts and solder (lead-free). All replacement parts provided by QSC for RoHS-compliant products are certified as RoHS compliant. RoHS-compliant tools Soldering irons and desoldering apparatus used on RoHS-compliant products must also not be contaminated by hazardous substances, such as lead. Therefore,

13、 you cannot use the same soldering and desoldering tools for RoHS-compliant products and solder as you do for non-compliant products and solder. You must either use separate soldering irons, desoldering tools and braid, etc., or at the very least designate separate tips and braids and use only the a

14、ppropriate ones. If you contami- nate a tip or braid, even inadvertently, by using it on a non-compliant product or solder, you should no longer use it with RoHS-compliant products or solder. 1.2 Revision history No revision history yet. 1.3 Service bulletins At the publish date of this service manu

15、al, 5 service bulletins concerning the DCA series amplifiers have been issued. Check or contact QSC Technical Services Group (TSG) for the latest information on applicable service docu- ments. For a quick summary, refer to “6. Service updates” on page 31. 1.4 Serial Numbers Serial numbers on QSC DCA

16、 series amplifiers are nine digits long. The first four digits are a manufacturing date code in mmyy format; the last five digits are the sequential identifying number for each individual product. For example, a serial number of 0711xxxxx would indicate that the QSC product was manufactured in 07/20

17、11, or July 2011. The amplifiers serial number can be found on the rear panel near the AC inlet. AMPLIFIER 120 V 2.3 A 50/60HZ Month Year 6 QSC Audio Products, LLC 1.5 The well-equipped service bench Service bench setup Desoldering equipment or desoldering braid Bank of non-inductive load resistors,

18、 configurable as 8 ohms min. 1500 watts capacity), as 4 ohms (min. 3000 watts), and 2 ohms Digital multi meter with RMS AC voltage and current Digital clamp-on ammeter Dual-trace oscilloscope, 1Mhz or greater Low-distortion audio sine wave generator Audio distortion analyzer (recommended Audio Preci

19、sion) Variable AC voltage source, such as a Variac or Powerstat Tools required Phillips and flat head screwdriver (electric recommended) Soldering iron and solder suitable for electronics Desoldering equipment or desoldering braid Hex nut driver set, 1/2” and 7/16” Desoldering equipment or desolderi

20、ng braid Basic tools for electronic repair including various pliers, wire-cutters, strippers, and crimpers. 7 TD-000495-00 DCA 2 Channel Series Service Manual 2. Product specification and imagesDCA1222 | DCA1622 | DCA2422 | DCA3022 | DCA3422 Details 1675 MacArthur Boulevard Costa Mesa, CA 92626 Ph:

21、800/854-4079 or 714/957-7100 Fax: 714/754-6174 DCA1222 | DCA1622 | DCA2422 | DCA3022 | DCA3422 Spec Sheet 02/06/2013 please recycle 2013 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and

22、 other countries. Speakon is a registered trademark of Neutrik. DCA1222 DCA1622 DCA2422 DCA3022 DCA3422 Stereo Mode (both channels driven) Continuous average output power per channel 8 / 20 Hz 20 kHz / 0.03% THD 200 W 300 W 425 W 550 W 700 W 8 / 1 kHz / 1% THD 215 W 350 W 475 W 625 W 800 W 4 / 20 Hz

23、 20 kHz / 0.05% THD 325 W 500 W 700 W 900 W 1100 W 4 / 1 kHz / 1% THD 375 W 600 W 825 W 1050 W 1250 W 2 / 1 kHz / 1% THD 600 W 800 W 1200 W 1500 W 1700 W Bridge-Mono Mode Continuous average output power 16 / FTC 20 Hz 20 kHz / 0.1% THD 400 W 600 W 850 W 1100 W 1400 W 8 / FTC 20 Hz 20 kHz / 0.1% THD

24、700 W1100 W 1500 W 2000 W 2300 W 4 / EIA 1 kHz / 1% THD 1200 W 1600 W 2400 W 3000 W 3400 W Signal to Noise (20 Hz 20 kHz) -106 dB -107 dB -108 dB -107 dB -107 dB Input Sensitivity at 8 1.0 Vrms 1.2 Vrms 1.5 Vrms 1.7 Vrms 1.9 Vrms Input Sensitivity at 4 0.9 Vrms 1.1 Vrms 1.3 Vrms 1.5 Vrms 1.7 Vrms Output Circuitry Class AB Class AB 2