Download
Share
Print this page
NAD CI 940 Service Manual
  1. Manuals
  2. Brands
  3. NAD Manuals
  4. Amplifier
  5. CI940
  6. Service manual
NAD CI 940 Service Manual

NAD CI 940 Service Manual

Hide thumbs Also See for CI 940:

Advertisement

Quick Links

Download this manual See also: Owner's Manual
NAD
CI 940
MULTI-CHANNEL
AMPLIFIER

Advertisement

loading
Need help?

Need help?

Do you have a question about the CI 940 and is the answer not in the manual?

Questions and answers

Related Manuals for NAD CI 940

Summary of Contents for NAD CI 940

  • Page 1 CI 940 MULTI-CHANNEL AMPLIFIER...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION…………………………………………………………..3-4 SPECIFICATIONS…………………………………………………………...5 WIRING DIAGRAM……………………………………………………………...6 BLOCK DIAGRAM…………………………………………………………..7-9 TROUBLE SHOOTING GUIDE…………………..........10 CIRCUIT DIAGRAMS..………………..........11-16 PCB LAYOUT………………………………………………………………..17-20 ELECTRICAL VIEW PARTS LIST…………………………………...…..21-35 EXPLODED VIEW PARTS LIST……………………………………………..37...
  • Page 3 PRODUCT SAFETY SERVICING GUIDELINES CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.
  • Page 4 SERVICING PRECAUTIONS CAUTION : Before servicing the poweramplifier covered by this Electrostatically Sensitive (ES) Devices service data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged easily by SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances static electricity.

  • Page 5: Specifications

    SPECIFICATIONS CI 940 Continuous Output Power 8 Ohms/4 Ohms 4 x 35W (ref. rated THD, 20Hz-20kHz, all channels driven) 2 x 70W 8 Ohms in Bridge Mode Rated THD (250mW to rated power, CCIF IMD, DIM 100) ≤0.03% (ref. 20Hz-20kHz)

  • Page 7: Block Diagram

    Cascade Output L Zone 2 OUT Cascade Output R To MCU Audio sense circuit ZONE 2 LEFT NAD CI940 BLOCK DIAGRAM VERSION: V1.0 5V/1A Standy circuit AC PLUG IN meet 0.5W requirement Power Supply Board(SMPS) Drafted by: BEN Data: 2014-2-25...

  • Page 8: Troubleshooting Guide

    TROUBLESHOOTING GUIDE Connect AC Cord from CI940 POWER ON BY POWER SWITCH OF REAR PANEL CHECK THE LED CONTROL CIRCUIT IS THE AMBER LED LIGHTED? IS IT RED? ,AND PROTECET CIRCUIT CHECK THE 5V SUPPLY CIRCUIT CHECK THE 5V SUPPLY CIRCUIT CAN PRESSING STB KEY MAKE IS POWER MODE RIGHT? OR CHANGE AUTO ON MODE TO...

  • Page 9: Circuit Diagrams

    CIRCUIT DIAGRAMS 1.MAIN BOARD (1/2) R323 V CC /1/2W R314 R324 R603 C605 C311 4.7K 4.7K R319 C314 4.7uF C320 R331 220uF C315 C303 R313 47nF 100nF Q303 Q602 10uF 2SA970 2N5401 47uF /63V Q311 R325 R340 2SA2121 4.7K R307 R311 Q304 C322...
  • Page 10 1.MAIN BOARD (2/2) R123 /1/2W R114 R124 R503 C505 C111 R119 4.7K 4.7K C114 R131 4.7uF C120 C115 220uF C103 R113 47nF 100nF Q103 Q502 10uF 2SA970 2N5401 J307 47uF /63V Q111 R125 R140 2SA2121 4.7K R107 R111 C122 Q104 TEST POINT 2SA970 120pF...
  • Page 11 2.DISPLAY & POWERKEY BOARD +5VD C905 C906 C901 C902 R901 10uF R903 10uF R905 R906 R907 1000uF /10V 100nF 4.7K 4.7K Q902 Q901 C1015 C1015 IC901 R902 STC12C5A 16S2-35C-LQ FP44 C908 D409 R904 0.1uF P901A SEN DEFEAT AD3/P0.3 A12/P2.4 TRIG AD2/P0.2 A11/P2.3 R913...
  • Page 12 3.INPUT BOARD JA01A 4 Holes Temperature Detect a nd Fan SCH JA01C 4 HOLES RA25 DA08 N.I. RA24 DA09 A GN D +12VD R2002 R2003 A GN D N.I. CA15 34.8K U2000A JA01D N.I. 4 HOLES +12VD R2015 220R KTC4373-Y AGND NTC1 J2003...
  • Page 13 4.PSU & DCDC BOARD L901 22uH/6A C908 C909 10nF/1KV 10nF/1KV Q901 BT139X-600E R917 100K GNDP 200V/680UF R918 150P/200V R910 C902 C977 100K C911 R931 150P/200V R933 150R 150P/200V C917 T904 T906 C912 C914 R929 470nF/275VAC BAW56W BAW56W 10nF 500V T902 Q914 2.2R Q916...
  • Page 14 5.DUAL VOLTAGE BOARD R950 R951 100R 100K R952 C950 R953 909K 100N Q950 Q951 BC856BW R954 R955 R956 R957 R958 R959 BC856BW U950A R 960 LM393 U950B R961 R962 R963 Q952 BC846BW R964 C951 R965 Q953 Q954 220nF/25V D950 BC846BW Q955 BC846BW BC846BW...

  • Page 15: Pcb Layout

    PCB LAYOUT 1.MAIN BOARD Top Layout Bottom Layout...
  • Page 16 2.DISPLAY BOARD AND POWERKEY BOARD Top Layout Bottom Layout 3.INPUT BOARD Top Layout Bottom Layout...
  • Page 17 4.PSU & DCDC BOARD Top Layout Bottom Layout...
  • Page 18 5. PSU DUAL VOLTAGE BOARD Top Layout Bottom Layout...
  • Page 19 ELECTRICAL PARTS LIST PCB-1:MAIN BOARD PCB INFO 01-94001-20 Main Board 02-94001-01 Main Board VM1.1 FR- A16-94001-22 Main Board PCB 4,1.6mm,2Layers,1Oz,TG130,231 ×260mm DIODE D101, D103, D104, D105, D106, D201, D203, D204, D205, D206, D301, D303, 33-44148-00 Switch Diode 1N4148 D304, D305, D306, D401, D403, D404, D405, D406, D807, D809 D102, D202, D302, D402, D802, D803, 33-14709-00...
  • Page 20 R103, R104, R137, R140, R141, R203, R204, R237, R240, R241, R303, R304, 07-20223-50 Metal Film Resistor 22KΩ, 1/6W, ±5% R337, R340, R341, R403, R404, R437, R440, R441, R819, R821, R823, R824 R826 07-22202-50 Metal Film Resistor 22kΩ,1/6W,±1% R827 07-22702-50 Metal Film Resistor 27KΩ,1/6W,±1% R813 07-20473-50...
  • Page 21 C106, C213, C306, C413 25-10561-02 Polyester capacitor 1uF, ±5%, 63V C809, C810 06-10951-03 ALU Electrolytic Capacitor 1uF/50V, ±20% CD294, 4700uF, 63V, ±20%, 105 C805, C806 06-47261-00 ALU Electrolytic Capacitor ℃, 2pin,Pitch=10,25*50 JUMPER R803 21-06500-00 Link 5mm，D=1mm TRANSISTOR Q106, Q206, Q306, Q406, Q802 31-01015-04 Transistor A1015-GR...
  • Page 22 MISC HS101, HS201, HS301, HS401 78-040001-0 Heatsink Cushion HS4-860-B009V1-P007 FB501 79-132001-0 CR PAD CR Black, 26*26*12.5mm METAL PARTS G8G1 32-28042-00 Ground Solder Tap GND-8 AL6063,T=3mm,black HS101, HS201, HS301, HS401 70-460005-0 Heatsink4 oxide,H=35mm BUS801 69-010001-0 BUSBAR HS4-T972-B009V1-M015 FASTENERS R290Heatsink(C) 61-023508-0 Machine Screw MB3×8,plated black zinc 01-94000-00 ASSY HEATSINK...
  • Page 23 RESISTOR 10KΩ,0805,1/8W,±5%,RC0805JR- R901, R902, R903, R904, R907 07-90103-01 Chip Resistor 0710KL 4.7KΩ,0805,1/8W,± R905, R906 07-90472-01 Chip Resistor 5%,RC0805JR-074K7L 1KΩ,0805,1/8W,±5%,RC0805JR- R908, R912, R913 07-90102-01 Chip Resistor 071KL 510Ω,0805,1/8W,±1%,RC0805FR- R909, R910, R911, R914,R916 07-95100-01 Chip Resistor 07510RL 5.1KΩ,0805,1/8W,± R915, R917 07-95101-01 Chip Resistor 1%,RC0805FR-075K1L 4.7KΩ,0603,1/10W,±...
  • Page 24 RESISTOR RA06,RA07,RA29 07-91001-00 Chip Resistor 1KΩ,0603,1/10W,±1% RA13, RA20, RA21 07-92201-00 Chip Resistor 2.2KΩ,0603,1/10W,±1% RA11,RA15,RA16,RA18 07-91002-00 Chip Resistor 10KΩ,0603,1/10W,±1% RA10 07-92202-00 Chip Resistor 22KΩ,0603,1/10W,±1% RA05,RA08,RA14,RA17,RA19 07-91003-00 Chip Resistor 100KΩ,0603,1/10W,±1% RA01,RA02,RA03,RA04,RA09 07-92203-00 Chip Resistor 220KΩ,0603,1/10W,±1% RA12 07-91004-00 Chip Resistor 1MΩ,0603,1/10W,±1% 0Ω,0805,1/8W,±5%,RC0805JR- LA02,LA03 07-90000-01 Chip Resistor 0722RL...
  • Page 25 JA01, JA02 17-01004-00 4RCA AV4-8.4-13, 4RCA J2010 13-22504-05 Connector Socket XHB 2 .5A-4AW J2003, J2004 13-22502-00 Connector Socket XHB 2.5A-2A PA01A 13-22511-02 HOUSING XHB-11AW 67-114001-0 PCB Terminal HS40-360.1-B009V1-M002 PCB-4:POWER KEY BOARD PART NO. DESCRIPTION PCB INFO 01-94004-00 POWER KEY BOARD VM1.0 FR-4,1.6mm,2Layers,1Oz, A16-94004-21 POWER KEY PCB...
  • Page 26 Q918, Q919, Q920, Q921, Q922, Q923 31-00846-02 Transistors BC846BW SOT323 Q918, Q919, Q920, Q921, Q922, Q923 or N31-00846-06 Transistors BC846BW-7-F Q926, Q927, Q928 31-00856-03 Transistors BC856BW SOT323 Q926, Q927, Q928 or N31-00856-06 Transistors BC856BW-7-F Q930 31-00114-01 Digital transistor DTA114EKA Q933 31-03326-01 Transistor 2SC3326-A(TE85L,F), SC-59...
  • Page 27 1.2KΩ,0805,1/8W,± R970 07-91201-01 Chip Resistor 1%,RC0805FR-071K2L 2KΩ,0805,1/8W,±1%,RC0805FR- R989 07-92001-01 Chip Resistor 072KL 2.7KΩ,0805,1/8W,± R927, R947 07-92701-01 Chip Resistor 1%,RC0805FR-072K7L 4.7KΩ,0805,1/8W,± R996, R993 07-94701-01 Chip Resistor 1%,RC0805FR-074K7L 5.23KΩ,0805,1/8W,± R991 07-95231-01 Chip Resistor 1%,RC0805FR-075K23L 5.6KΩ,0805,1/8W,± R992, R994 07-95601-01 Chip Resistor 1%,RC0805FR-075K6L R813, R903, R969, R982, R986, R990, 10KΩ,0805,1/8W,±...
  • Page 28 10nK,630V,X7R,1206,1206CC103 C901, C908, C909, C945, C974 26-10362-12 Ceramic Chip Capacitor KAZ1A 100nK,200V,1206,X7R,C3216X7R C970, C971 26-10422-02 Ceramic Chip Capacitor 2E104KT 100pJ,50V,0805,NPO,C2012C0G C930 26-10151-01 Ceramic Chip Capacitor 1H101JT Interfernece Suppression MKP62/MPX,0.47uF, 275V, 10%, CX901, CX902, C917, C918 A25-47422-00 Pitch=15mm 1nF,400V(X1),250V(Y1),± Hign Voltage Cermatic CY901 CY902 CY903 CY904 A05-10242-00 20%,CT81-400VAC-08b-2E4-...
  • Page 29 J901(TO MAIN board P802B 14-94007-00 Cable UL2468#26AWG*7C, L=280mm F901 A20-12122-04 FUSE 1.25AL250V MECHANISM PARTS S902 70-460002-0 Heat sink T=3mm S901 70-460003-0 Heat sink T=3mm 70-420003-2 Heat sink T=3mm FASTENERS 85-460002-0 Moveable Bushing KG-030N, L=260mm (Q912, Q913) 66-162004-0 S2 Clamp 3 Q912, Q913 78-184001-0 Insulated Sleeve...
  • Page 30 1KΩ,0603,1/10W,± R965, R972 07-91001-00 Chip Resistor 1%,RC0603FR-071KL 2.7KΩ,0603,1/10W,± R966 07-92701-00 Chip Resistor 1%,RC0603FR-072K7L 10KΩ,0603,1/10W,± R957, R958, R963, R967, R971 07-91002-00 Chip Resistor 1%,RC0603FR-0710KL 47KΩ,0603,1/10W,± R970 07-94702-00 Chip Resistor 1%,RC0603FR-0747KL R952, R953, R959, R961, R962, R968, 100KΩ,0603,1/10W,± 07-91003-00 Chip resistor R969 1%,RC0603FR-07100KL 180KΩ,0603,1/10W,±...
  • Page 31 10KΩ,0603,1/10W,± R868 07-91002-00 Chip Resistor 1%,RC0603FR-0710KL 1Ω,0603,1/10W,±1%,RC0603FR- R830 07-91008-00 Chip resistor 071RL CAPACITOR 100nK,50V,0805,X7R,C2012X7R1 C812 26-10451-11 Ceramic Chip Capacitor H104KT 12nK,0603,50V,X7R,C1608X7R1H C813 26-12351-10 Ceramic Chip Capacitor 123KT000N 2.2uK,50V,1206,X7R,CC1206KKX C810, C811 26-22551-02 Ceramic Chip Capacitor 7R9BB225 5.6pF,50V,0603,NPO,± C816 26-56951-10 Ceramic Chip Capacitor 0.25pF,C1608C0G1H5R6CT C817 26-27251-00...
  • Page 32 A35-26025-01 FD126025-SM1,L=11cm METAL PARTS 70-460004-0B front panel AL6063 T5 67-460001-1 subfascia SECC T=1.2mm 65-460001-1 subfascia SECC T=1.2mm 66-420003-0 converter block SECC T=1.5mm 70-420007-1 Moutain Bar 2 AL 6063 T5 70-420008-1 Moutain Bar 1 AL 6063 T5 70-420012-1 Handle AL 6063 T5 67-420007-0 fan guard G06B4-4HA-R...
  • Page 33 Foot pad and chassis(4),rear panel and chassis(5)，rear panel and top cover (3),front panel and subfascia(4) ，Fixed 61-023206-0 Self Tapping Screw BTB3x6,plated black zinc 360.1 terminal and rear panel （2） Install switch socket(2),Install repair window(8) Fixed switch socket(2),converter block 61-063208-0 Taptite Screw BTF3×8,plated black zinc and chassis(4) ACCESSORY...
  • Page 34 ASSY EXPLODE VIEW 25 26 27 23 24 15 16 19 20...
  • Page 35 EXPLODE VIEW PARTS LIST PART/NO PART/NAME REMARK ITEM 67-460003-1 top cover 80-460002-2 rear panel A17-07002-07 AC INLET or A17-07002-00 A11-01101-03 switch JA20-20000-10 fuse holder 01-94005-00 psu pcb 70-460001-3 main heatsink 66-460001-1 chassis 66-420003-0 shifted block 70-420008-1 mountain bar1 70-420012-1 handle 01-94004-00 power key PCB power button...
  • Page 36 NAD ELECTRONICS LTD TORONTO...