QSC CX Series Operating manual

CX Series
CX 8-Channel Power Amplifiers
TECHNICAL SERVICE MANUAL
Technical Service Manual
Rev. A
*TD-000168-00*
d CX 168
d
CX 108
V

2
CX Series
8-Channel Power Amplifiers
SERVICE MANUAL
IMPORTANT NOTICE:
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION, WHICH IS THE PROPERTY
OF QSC AUDIO PRODUCTS, THAT MAY NOT
BE DISCLOSED, REPRODUCED OR USED
WITHOUT EXPRESS OR WRITTEN CONSENT
FROM QSC AUDIO PRODUCTS.
QSC Audio Products Inc.
Technical Services Group
Toll Free: 800-772-2834
Local: 714-957-7150
Fax: [phone]
QSC Audio Products, Inc.
1675 Macarthur Blvd.
Costa Mesa, CA 92626
www.qscaudio.com
[e-mail]

3
CX 168
CX 108V

4
Table of Contents
Product Specifications 5
Parts Listings
CX 168 Pack Out Assemblies 6
CX 168 Chassis Assemblies 7
CX 168 PCB Assemblies 8
CX 108V Pack Out Assemblies 20
CX 108V Chassis Assemblies 21
CX 108V PCB Assemblies 22
Semiconductors 33
Chassis Drawings 39
Schematics
CX 168 Schematics 62
CX 108V Schematics 69
Main PCB Assembly Layout 76

5
CX 168 / CX 108V SPECIFICATIONS

6
CX 168 / CX 108V
Replacement Parts
CX168 PACKOUT ASSEMBLY CATALOG KIT ASSEMBLY
Part Number Description Reference Part Number Description Reference
CH-000122-00 COVER, BOTTOM, DCA3022 TD-000002-001EXTENDED SERVICE,
LB-000209-001AGENCY, CERTIFICATION, REGISTRATION
CLASS B, FCC TD-000134-001ACCESSORY OFFER SHEET
LB-000437-00 LABEL, WARNING, RAIN & NEW LOGO
MOISTURE, BASIS 922AZ TD-000135-001AUDIOWEAR CATALOG
PL-000003-CP AC CORD PROTECTOR, TD-000900-AX1WARRANTY CARD, GENERIC
0.625 OD, POLYETHYLENE,
NATURAL CX168 SHIP KIT ASSEMBLY
PM-000029-00 INSERT, SHIPPING,
PLC 2RU, 17.5" X 23.5" Part Number Description Reference
PM-001101-00 CARTON, SHIPPING,
MX700, 17.5" X 23.5" X 4.65" CO-000198-00 PLUG, EURO, 3 POS, MALE
PM-001401-00 BAG, SHIPPING, GREEN STRAIN RELIEF
POLYPROPYLENE, CO-000200-00 PLUG, EURO POWER,
SERIES 1, 20.5" X 12.5" X 24" 8 POS, MALE, GREEN
SC-082051-PL PHILLIPS, PANHEAD, PL-000000-AF BUMPER, ADHESIVE
SERATED BASE, #8, 0.313", BACKED, 0.812" X 0.812"
L, BLACK POLYURETHANE,
TD-000095-00 OWNERS MANUAL, CX168 BLACK
WC-000139-002AC CORD, IEC, 14 AWG, PM-100998-PB BAG, PLASTIC, 3" X 6"
3 CONDUCTOR, PLC, 72", PM-300996-PB BAG, PLASTIC, 6" X 8"
L MINIMUM, 125 VAC 2 MIL THICK
WP-000001-001ASSEMBLY, CATALOG KIT WP-000072-00 LOCKOUT PLATE ASSY,
WP-000087-00 SHIP KIT, CX 8CH CX168
WP-000168-003CHASSIS ASSY, CX168, 120V
WP-000169-004PCB ASSY, CX168, 120V LOCKOUT PLATE ASSEMBLY
CATALOG KIT ASSEMBLY Part Number Description Reference
Part Number Description Reference CH-000160-00 PLATE, LOCKOUT,
GAIN, CX168,
PM-300998-PB1BAG, PLASTIC, 9" X 12" LB-000352-00 PRODUCT, LOCKOUT
TD-000001-001EXTENDED SERVICE, COVER, CX 8CH
COVERAGE INSERT

7
CX 168 / CX 108V
Replacement Parts
CX168 CHASSIS ASSEMBLY CX168 CHASSIS ASSEMBLY
Part Number Description Reference Part Number Description Reference
CH-000112-00 SHIELD, LINE FILTER, PLX3002 SC-060042-PP PHILLIPS, PANHEAD SEMS
CH-000118-00 RACK EAR, FRONT, CX902 INTERNAL TOOTH, #6-32,
CH-000159-00 CHASSIS, MAIN, , CX168 0.25" L, BLK, ZINC
CH-000188-00 BRACKET, OUTPUT, CX168 SC-060060-PS PHILLIPS, SEMS EXTERNAL
CO-000169-00 JACK, IEC, 3 POS, FEMALE TOOTH, #6-32, 0.375" L, ZINC
CO-000199-00 JACK, EURO POWER, 8 POS, SC-061081-PP PHILLIPS, PANHEAD, #6,
FEMALE, GREEN 0.375" L, ZINC, TYPE B
HW-040001-00 BRACKET, ANGLE, #4-40, SC-080122-HC HEX, CAP, #8-32, 0.75" L,
0.375" L, ZINC PLATED STEEL BLACK
HW-060090-SO STANDOFF, 0.250" HEX, SC-082051-PL PHILLIPS PANHEAD SERATED
#6-32, 0.563" L, ALUMINUM, BASE, #8, 0.313" L, BLACK
FEMALE SW-000037-00 AC SW, DPST, 20A, 125VAC,
LB-000053-00 FUSE, REPLACEMENT, WC-000138-00 CABLE ASSY, AC, 16 AWG,
FRENCH 3 CONDUCTOR, DCA/CX, 5" L
LB-000077-00 WARNING, HIGH ENERGY, WC-000164-00 CABLE ASSY, OUTPUT
PL 3RU 18 AWG, 8 CONDUCTOR,
LB-000350-00 PRODUCT, FACEPLATE, CX168, 10" L
CX168 WC-000238-00 RIBBON CABLE ASSY, J103, J104,
LB-000351-00 PRODUCT, MODE SWITCH 28 AWG, 26 CONDUCTOR, J13, J14
REAR, CX168 7" L, AMP CORP ONLY
LB-000409-005AGENCY, 68FA LISTING, WC-000239-00 RIBBON CABLE ASSY, J504, J704
HORIZONTAL, UL/CUL 28 AWG, 26 CONDUCTOR,
LB-000440-00 LABEL, WIRE CLASS 2 12" L, AMP CORP ONLY
LB-160226-056FUSE, 25A, 125V, UL WP-000057-00 FAN ASSY, PLC
PL-000066-00 CLIP, CHRISTMAS TREE, XF-000202-00 CABLE SUPPRESSION,
NYLON, BLACK 100MHZ, 250, CLAMP-ON
PL-000095-00 FAN INTERFACE, PLX 2RU,
POLYPROPYLENE, BLACK FAN ASSEMBLY
PL-000136-00 KNOB, PLC, PLASTIC, BLACK
PL-000144-00 INSULATOR, FAN DUCT, Part Number Description Reference
PL2/2A, FISH PAPER
PL-000175-00 ISOLATOR, INPUT, CX168, CO-000108-00 PLUG, 0.1" CENTERS,
FISH PAPER 2 POS (1X2), FEMALE,
SC-040041-PP PHILLIPS, PANHEAD, RAMP LOCK 26 AWG
#4-40, 0.25" L, BLACK MS-000085-00 FAN, 24VDC, 3.15"
SC-040061-PT PHILLIPS, TRUSS, #4-40,
0.375" L, BLACK

8
CX 168 / CX 108V
Replacement Parts
CX168 PCB ASSEMBLY CX168 PCB ASSEMBLY
Part Number Description Reference Part Number Description Reference
CA-010002-30 10PF, 5 PCNT, 50V C123, C131, C328, C329,
CERAMIC NPO, 0805 C523, C531, C332, C333,
C723, C731, C334, C527,
C331, C323 C528, C529,
CA-047002-30 47PF, 5 PCNT, 50V, C124, C130, C533, C534,
CERAMIC NPO, 0805 C141, C148, C6, C727,
C324, C330, C728, C729,
C341, C348, C732, C733,
C541, C62,
C734, C132,
C724, C730, C532, C4
C741, C748, CA-222001-00 0.0022UF, 20 PCNT, 125VAC, C28, C25
C524, C530, CERAMIC Y5U, DISC, YCAP
C548
CA-227001-30 0.0027UF, 10 PCNT, 100V, C11, C17,
CA-110002-30 100PF, 5 PCNT, 50V, C108, C109, CERAMIC X7R, 0805 C14
CERAMIC NPO, 0805 C110, C111, CA-233002-00 0.0033UF, 20 PCNT, 125VAC, C13, C16
C308, C309, CERAMIC, DISC, YCAP
C311, C508, CA-410001-00 0.1UF, 20 PCNT, 250VAC, C22
C509, C510, FILM, BOX STYLE, XCAP
C511, C708, CA-410002-10 0.1UF, 5 PCNT, 100V, FILM C121, C122,
C709, C710, C321, C322,
C711, C310 C521, C522,
CA-122003-30 220PF, 5 PCNT, 50V, C102, C103, C721, C722
CERAMIC NPO, 1206 C105, C301, CA-410003-10 0.1UF, 10 PCNT, 250V, FILM C140, C145,
C303, C305, C146, C339,
C501, C502, C340, C345,
C503, C505, C346, C539,
C701, C703, C540, C545,
C705, C101, C546, C739,
C702, C302 C745, C139,
CA-133001-10 330PF, 5 PCNT, 500V, MICA C40, C41 C740, C746
CA-147003-30 470PF, 5 PCNT, 50V, C20, C50, CA-410006-30 0.1UF, 10 PCNT, 50V, C157, C158,
CERAMIC NPO, 1206 C64, C59 CERAMIC X7R, 1206 C23, C29,
CA-168001-10 680PF, 10 PCNT, 100V, C359 C3, C357,
CERAMIC Z5U, DISC
C358, C51,
CA-210005-30 0.001UF, 5 PCNT, 50V, C127, C128, C54, C557,
CERAMIC NPO, 1206 C129, C133, C558, C56,
C134, C327, C57, C60,

9
CX 168 / CX 108V
Replacement Parts
CX168 PCB ASSEMBLY CX168 PCB ASSEMBLY
Part Number Description Reference Part Number Description Reference
C63, C7,
ELECTROLYTIC C147, C151,
C757, C758, C19, C24,
C55, C58 C326, C347,
CA-410007-30 0.1UF, 20 PCNT, 50V, C104, C106, C351, C525,
CERAMIC Z5U, 1206 C112, C155, C547, C551,
C156, C304, C725, C726,
C306, C312, C747, C751,
C355, C356, C526, C325
C504, C506, CA-647001-10 47UF, 10 PCNT, 10V, C114, C115,
C507, C555, ELECTROLYTIC, NON-POLAR C149, C150,
C556, C704, C152, C315,
C706, C707, C342, C349,
C712, C755, C350, C352,
C756, C107, C514, C515,
C512, C307 C542, C549,
CA-410011-00 0.1UF, 10 PCNT, 400V, FILM C10, C37 C550, C714,
CA-415002-10 0.15UF, 5 PCNT, 50V, FILM C117, C120, C742, C749,
C317, C320, C750, C752,
C517, C520, C314, C715,
C717, C720 C142, C552
CA-422001-10 0.22UF, 5 PCNT, 50V, FILM, C118, C119, CA-647002-10 47UF, 20 PCNT, 50V, C9
DIPPED, LOW PROFILE C318, C319, ELECTROLYTIC LOW PROFILE
C518, C519, CA-710002-10 100UF, 20 PCNT, 25V, C113, C116,
C718, C719 ELECTROLYTIC C137, C138,
CA-422004-30 0.22UF, 10 PCNT, 50V, C21 C313, C316,
CERAMIC X7R, 1206 C33, C34,
CA-447001-00 0.47UF, 20 PCNT, 250VAC, C18 C35, C513,
FILM, BOX STYLE, XCAP C516, C537,
CA-510006-00 1.0UF, 20 PCNT, 250VAC, C12, C15 C538, C61,
FILM, BOX STYLE, XCAP C713, C716,
CA-510008-00 1.0UF, 10 PCNT, 250V, FILM, C36, C39 C737, C337,
DIPPED, PULSE C738, C338
CA-518001-00 1.8UF, 10 PCNT, 160V, FILM, C153, C154, CA-710004-10 100UF, 20 PCNT, 25V, C32, C52,
DIPPED, PULSE C353, C354, ELECTROLYTIC, LOW ESR C53
C553, C554, CA-822200-AE 2200UF, 20 PCNT, 200V, C27, C26
C753, C754 ELECTROLYTIC
CA-610002-10 10UF, 20 PCNT, 35V, C125, C126, CA-833080-BE 3300UF, 20 PCNT, 80V, C135, C136,

10
CX 168 / CX 108V
Replacement Parts
CX168 PCB ASSEMBLY CX168 PCB ASSEMBLY
Part Number Description Reference Part Number Description Reference
ELECTROLYTIC C143, C144, HW-000001-FC FUSE CLIP, PC MOUNT,TIN
C335, C336, PLATED BRASS, 3AG
C343, C535, IC-000024-00 CONTROLLER, PWM, U7
C536, C543, SG3525AN
C544, C736, IC-000046-30 OPAMP, DUAL, TLO72, SMT U105, U106,
C743, C744, U305, U306,
C344, C735 U505, U705,
CH-000103-00 CLAMP, TO-3PL, 22 GA, U706, U506
PLX3002 IC-000048-30 OPAMP, DUAL, MC33078 U101, U102,
CH-000104-00 HEAT SINK, PS,PLX3002 U301, U302,
CH-000114-00 CLAMP, DIODE, U501, U701,
2 FINGER, PLX3002 U702, U502
CH-000182-00 HEAT SINK, AUDIO,CX168 IC-000051-00 OPTO ISOLATOR, , MOC8101 U2, U3
CO-000009-ZT ZTAB, 0.025" TAB, 1 POS, J21, J5, J6 IC-000054-30 COMPARATOR, QUAD, U1
MALE, AUTO INSERTABLE LM339AM, SMT
CO-000043-CO HEADER, 0.1" CENTERS, J104B,J504B, IC-000073-30 TRANSCONDUCTANCE U103, U303,
26 POS (2X13), MALE, BOX J704B,J304B OPAMP, DUAL, LM13600M U503, U703
CO-000098-00 HEADER, 0.1" CENTERS, J104A, J13A, IC-000133-30 COMPARATOR, SINGLE, U6
26 POS (2X13), J13B, J14A, LM311, SMT
MALE, LATCHING BOX SHORT J304A,J504A, IC-000134-00 DRIVER, MOSFET, IR2110 U5
J704A, J14B IC-000135-00 TOP SWITCH, , TOP210 U4
CO-000106-00 JACK, HD15, 15 POS, FEMALE J102, J302, IC-000143-30 ANALOG SWITCH, QUAD, U104, U304,
RIGHT ANGLE SWAGED J702, J502 DG201 U704, U504
JACK SCREW MS-000048-HS HEAT SINK, TO-220,
CO-000155-00 HEADER, 0.1" CENTERS, J4 1.375" X 0.86" X 0.395",
2 POS (1X2), MALE, LONG TAB, PLUG-IN
RAMP LOCK MS-000112-007FUSE, 25A, 125V, F1
CO-000161-00 JACK, EURO, 3 POS, J101, J103, 0.25" X 1.25", NORMAL-BLO
FEMALE, BLACK J301, J303, MS-000115-30 FUSE, 1.0A, 24V, 1206, SLO F101, F301,
J503, J701, F501, F701
J703, J501 MS-000128-30 FUSE, 5A, 24V, 1206 F102, F103,
CO-000196-00 HEADER, 0.1" CENTERS, J17 F302, F303,
3 POS (1X3), MALE, RAMP F502, F503,
LOCK F702, F703
CO-641119-AH HEADER, 0.156" CENTERS, J18, J19 PA-000054-00 LED ASSY, LD502,LD702,
8 POS (1X8), MALE, RED-GREEN-ORANGE, LD102,LD302
RAMP LOCK GOLD RIGHT ANGLE SPACER