NAD T 741 Service Manual
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NAD T 741 Service Manual

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NAD
T 741
S U R R O U N D
SOUND RECEIVER

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Summary of Contents for NAD T 741

  • Page 1 T 741 S U R R O U N D SOUND RECEIVER...

  • Page 2: Table Of Contents

    SERVICE SAFETY PRECAUTIONS Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference No Part Number Description M271 5120-0024-0 3.15A TIME-LAG 5x20 VDE-SEMKO NOTE: <*AH > : USA, CANADIAN MODEL ONLY. <*C >...

  • Page 3: Specifications

    SPECIFICATIONS POWER AMPLIFIER AND PREAMPLIFIER SECTION (all channels stated 8 ohms) ) 0.08% Rated distortion (THD 20Hz-20 kHz FL/C/FR) ) 0.3% (THD 20Hz-20 kHz SL/SR) Input Sensitivity (ref. 8 ohms, 1 kHz) 180+/-30 mV * -78 dB S/N Ratio (A-wtd, 1KHz, 1W, 8 ohm) * 92 dB (A-wtd, 1KHz, 80W, 8 ohm) FL/FR/C...
  • Page 4 AM TUNER SECTION Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator ) 30 dBµ Usable sensitivity (999/1000kHz) * 38 dB S/N Ratio (5mV in) ) 3% THD (5mV in) * 36 dB IF Rejection (450 kHz) * 28 dB Image Rejection (F+2xIF) * 17 dB...

  • Page 5: Rear Panel / Front Panel

    3. 5.1 CHANNEL INPUT 10. SOFT CLIPPING 4. VIDEO 1 - VIDEO 4 (AUDIO & VIDEO) 11. SPEAKERS: FRONT, CENTER & SURROUND 5. NAD-LINK INPUT / OUTPUT SPEAKERS 6. DIGITAL AUDIO INPUTS / OUTPUTS 12. AC POWER CORD 7. 12V TRIGGER INPUT...

  • Page 6: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels. Remove tapping screw 3.0 x 8.5 ( 7 )from the back panel. Refer to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35˚ and then remove in the direction as indicated by the arrow 9 .

  • Page 7: Wiring Diagram

    WIRING DIAGRAM POWER CORD SPEAKER PCB PSU PCB P261 P262 P260 S-VIDEO PCB VIDEO PCB P260 P261 P262 P264 J201B J101B DIGITAL PCB T201A T202A AUDIO PCB PRIMARY PCB C221 JP209 JP207 JP206 C230 M707A TUNER PCB M708A J401B SURROUND AMPLIFIER PCB +35V GND MAIN PCB...

  • Page 8: Block Diagram

    BLOCK DIAGRAM ADJUSTMENT POINTS DIAGRAM 1. TUNER 2. IDLE CURRENT - Front Amplifier & Surround Amplifier Board...

  • Page 10: Instrument Setup

    INSTRUMENT SETUP 1. FM MEASUREMENT ANTENNA OUTPUT TERMINAL TERMINAL Fig. 1 DISTORTION UNIT SIGNAL ANALYZER GENERATOR P-901 VOLTMETER MILLIVOLT METER OSCILLOSCOPE Fig. 2 ANTENNA OUTPUT TERMINAL TERMINAL DISTORTION UNIT STEREO SIGNAL ANALYZER GENERATOR GENERATOR OSCILLOSCOPE VOLTMETER 2. RDS MEASUREMENT ANTENNA Fig.

  • Page 11: Important Notes

    FM/RDS SECTION - FM mono: 1kHz, 75kHz devi., 60dB/μV - FM stereo: 1kHz, 67.5kHz devi., 60dB/μV Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted. Connection FM SG Stereo mod- Tuning...

  • Page 12: Pcb Layout

    PCB LAYOUT S-VIDEO BOARD VIDEO-5 BOARD VOLUME BOARD...
  • Page 13 VIDEO BOARD TUNER BOARD...
  • Page 14 SURROUND AMPLIFIER BOARD PRIMARY BOARD SECONDARY BOARD...
  • Page 15 AUDIO BOARD PSU BOARD...
  • Page 16 MULTI-CHANNEL BOARD - COMPONENT SIDE...
  • Page 17 MULTI-CHANNEL BOARD - SOLDER SIDE...
  • Page 18 MAIN BOARD...
  • Page 19 AC3 BOARD - COMPONENT SIDE AC3 BOARD - SOLDER SIDE...
  • Page 20 KEY BOARD POWER SWITCH BOARD LED BOARD SPEAKER BOARD DIGITAL BOARD...

  • Page 21: Schematic Diagram

    SCHEMATIC DIAGRAM AC3 / DTS NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/10W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.
  • Page 22 MAIN NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. MF-METAL FILM 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.
  • Page 23 MULTI-CHANNEL -12V C683 C685 J601A J706B U601C U603C U606C U608C U602C U607C ( FROM AC3 J601B ) ( FROM MAIN J706A ) 10u/16V NJM5532 10u/16V NJM5532 AC3 IN STE IN NJM5532 NJM5532 NJM5532 NJM5532 C686 C684 10u/16V +12V 10u/16V 5532 U609A C6101 C608 220p...
  • Page 24 KEYBOARD NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.
  • Page 25 TUNER NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.
  • Page 26 S-VIDEO INPUT CT-A CT-B C501 47U/10V R549 C502 47U/10V VIDEO1 C522 M501 100U/16V R501 R502 Z501 S_V2 IN VIDEO2 C503 R536 R537 150R 470R VIDEO3 47U/10V R532 R533 C504 U501 CD4052A M502 R503 R504 S_V1 IN 47U/10V R550 R551 Q522 C505 R534 R535...
  • Page 27 FRONT AMPLIFIER D7708 1N4148 D7714 HP_R R7754 HP_L M7702 L7701 1mH R7720 8.2R 1W 2.2R 1/2W C7728 R7711 1N4004 0.022U 680R Q7727 R7703 R7771 0.22R 1W R7774 R7753 2SC5197 Q7735 DTC123 Q7701 2.2R 1/2W L7702 1mH Q7708 R7766 RELAY_B Q7732 R7772 0.22R 1W M7701 2SA992...
  • Page 28 AUDIO VIDEO...
  • Page 29 SURROUND AMPLIFIER...

  • Page 31: Ic Block Diagram

    IC BLOCK DIAGRAM AC3 BOARD U101: 74HC153 AC3 BOARD U102: 74HC157 AC3 BOARD MCLK SCLK LRCK U103: CS5331A Voltage Reference Serial Output Interface SDATA AINL Digital LP Filter High Decimation Pass Filter Filter Comparator AINR Digital High LP Filter Decimation Pass Filter Filter...
  • Page 32 AC3 BOARD AC3 BOARD U108: AT27C020-70 U104, U109, U116, U134: NJM5532 DATA OUTPUTS U131: NJM4558D O0-O7 (32) (13-15, 17-21) GND(16) AMPLIFIER 1 AMPLIFIER 2 VPP(1) OUTPUT OE(24) OUTPUT OE, CE AND INVERTING CE(22) BUFFERS PROGRAM LOGIC INPUT OUTPUT PGM(31) – + + –...
  • Page 33 AC3 BOARD U110: CS8414 VD+ DGND FILT AGND M3 M2 M1 M0 SDATA Audio Serial Port FSYNC RS422 Clock & Data De-Mux Receiver Recovery Registers VERF CS12/FCK C0/E0 Ca/E1 Cb/E2 Cc/F0 Cd/F1 Ce/F2 AC3 BOARD U111-U113: CS4340 SCLK/DEM1 DEM0 MUTEC De-emphasis External Mute Control...
  • Page 34 AC3 BOARD AC3 BOARD U114: 74HCU04 U118, U119: 74HC00 14 VAC 13 6A 12 6Y 11 5A 10 5Y AUDIO BOARD U301: HCF4053BT LEVEL CONVERTER 16 V 15 Z 14 Z 13 Y 12 Y 11 S 10 S...
  • Page 35 AUDIO BOARD DIGITAL BOARD U302: TC9273N-004 U761: 74HCT00 27 S1 26 S2 25 S3 (L-ch) (R-ch) 24 S4 10bit 10bit 23 S5 Latch Latch 22 S6 Circuit Circuit 21 S7 (Same 20 S8 as L-ch 19 S9 Circuit) 18 S10 17 S11 LEVEL SHIFT + SHIFT RESISTER CIRCUIT...
  • Page 36 KEY BOARD DOUT SENSE AMPS U202: EEPROM 24C02 SHIFT REGISTERS WORD ADDRESS COLUMN BUFFERS DECODERS START/STOP LOGIC XDEC PROM CONTROL LOGIC DATA IN STORAGE HIGH VOLTAGE/ TIMING CONTROL STATE COUNTERS SLAVE ADDRESS COMPARATORS MAIN BOARD MULTI-CHANNEL BOARD U701: NJM5532M U605: M6244FP AMPLIFIER 1 AMPLIFIER 2 OUTPUT...
  • Page 37 MULTI-CHANNEL BOARD MULTI-CHANNEL BOARD U604: TC9164AN U601, U602, U606, U607, U609: NJM5532 U603, U608: NJM4558D U701-U703: NJM4558M L-S1 R-S1 AMPLIFIER 1 AMPLIFIER 2 L-S2 R-S2 OUTPUT L-S3 R-S3 INVERTING INPUT OUTPUT L-S4 R-S4 – + + – NON-INVERTING INVERTING L-COM1 R-COM1 INPUT INPUT...
  • Page 38 TUNER BOARD U902: LC72723M V REF FLOUT Vddd Vdda CLOCK RECOVERY REFERENCE (57kHz) (1187.5Hz) VOLTAGE Vssd Vssa V REF 57kHz RDDA DATA MPXIN SMOOTHING ANTIALIASING (SCF) DECODER FILTER FILTER RDCL MODE (128bits) CLK(4.332MHz) RDS-ID/READY TEST RDS-ID TEST DETECT X IN X OUT TUNER BOARD U903: LC7218...
  • Page 39 S-VIDEO ASSEMBLY U501: 4052 X CHANNELS IN/OUT COMMON X OUT/IN COMMON Y OUT/IN BINARY LOGIC LEVEL 1 OF 4 CONVERSION DECODER WITH IN H INHIBIT Y CHANNELS IN/OUT VIDEO ASSEMBLY U401: MC14051 CHANNEL IN/OUT COMMON BINARY OUT/IN LOGIC LEVEL 1 OF 8 CONVERSION DECODER WITH...

  • Page 40: Electrical Parts List

    ELECTRICAL PARTS LIST Reference No. Part No. Description AC3 BOARD 1000 PCB-N0A00C-AC3 AC3 ASSEMBLY MISCELLANEOUS 2702 2954-3008-0000 TAPPING 3X8MM B-TITE 2703 4151-9931-0 INSULATION BUSHING 2704 2954-2606-0000 SCREWS BT 2.6X6 CAPACITORS C101 150F-104K-J-BD CC 50V 0.1μF 10% 0805 C102 150E-104M-J-BD CC 25V 0.1μF 20% 0805 C103 150F-104K-J-BD CC 50V 0.1μF 10% 0805...
  • Page 41 Reference No. Part No. Description C123 150F-562K-J-BD CC 50V 5600pF 10% 0805 C125 150E-104M-J-BD CC 25V 0.1F 20% 0805 C126 157D-227M-5-KW CE 16V 220μF 20% RL 6x12 C127 150E-104M-J-BD CC 25V 0.1F 20% 0805 C128 157D-106M-5-GM CE 16V 10μF 20% RL 4x7 C129 150E-104M-J-BD CC 25V 0.1F 20% 0805...
  • Page 42 Reference No. Part No. Description HEATSINKS H-U121 5400-0831-0 HEATSINK H-U123 5400-9130-0 HEAT SINK FOR 7805 2438- WAFERS J101A 2102-101S-004 WAFER 10P P2.5 ST. J203B 2101-1581-0 FLEXIBLE CONN. 35P J601B 2102-121S-004 12P ST.WAFER J604B 2102-031S-004 3 PIN ST. WAFER COILS L101-L103 1801-100K-M COIL 10μH 10% BL7.0 L104...
  • Page 43 Reference No. Part No. Description R138 4720-103J-J RMG 1/10W 10K 5% 0805 R139 4720-102J-J RMG 1/10W 1K 5% 0805 R140 4720-101J-J RMG 1/10W 100R 5% 0805 R1401, R1404 4720-102J-J RMG 1/10W 1K 5% 0805 R1405 4720-104J-J RMG 1/10W 100K 5% 0805 R1406 4720-203J-J RMG 1/10W 20K 5% 0805...
  • Page 44 Reference No. Part No. Description U125 3130-2020-3 IC 7805 REG 5V 1.5A U131 3130-0890-0 IC NJM4558D DUAL OP AMP. U134 3130-9560-0 NJM5532 IC 'DIP8' SURROUND AMP BOARD 2000 PCB-N0A00C-AMP2 SL/SR POWER AMP ASSEMBLY CAPACITORS C201 157F-106M-5-IUE CE 50V 10μF 20% RL 5X11 C202, C203 150F-101K-2-FC CC 50V 100pF 10% AT 3.5x...
  • Page 45 Reference No. Part No. Description Q214 4860-8890-0 TR MPS A06 VCE 80V NS Q215 4860-8900-0 TR MPS A13 VCE 100V Q216 4860-8890-0 TR MPS A06 VCE 80V NS Q217 4860-8910-0 TR MPS A56 VCE 80V NS Q218 4860-5210-5 TR 2SC5198-0 HFE 80-160 Q219 4860-5220-5 TR 2SA1941-0 HFE 80-160...
  • Page 46 Reference No. Part No. Description AUDIO ASSEMBLY 3000 PCB-N0A00C-AUD AUDIO ASSEMBLY CAPACITORS C301-C306 150F-101K-2-FC CC 50V 100pF 10% AT 3.5x C309-C314 150F-101K-2-FC CC 50V 100pF 10% AT 3.5x C315, C316 150F-103K-2-FC CC 50V 0.01μF 10% AT 3.5 C317, C318 150F-223K-2-FD CC 50V 0.022μF 10% AT C319-C324 157D-335M-5-II...
  • Page 47 Reference No. Part No. Description R762 4701-104J-C RCF 1/8W 100K 5% ATS U761 3130-7370-0 IC 74HCT00 NAND GATE KEY ASSEMBLY 2200 PCB-N0A00C-KEY KEY ASSEMBLY LED DISPLAY 2119 2460-1890-2 VFD 12-MT-84GNK FUTABA CAPACITORS C205, C207 150F-104Z-5-IU CC 50V 0.1μF +80/-20% RL C203, C204 150F-220K-5-GG CC 50V 22pF 10% RL 4x4...
  • Page 48 Reference No. Part No. Description Q201 4860-0050-5 TR SS8050 C/D SAMSUNG RL RESISTORS R201-R203 4701-681J-C RCF 1/8W 680R 5% ATS R204-R206 4701-821J-C RCF 1/8W 820R 5% ATS R207-R209 4701-182J-C RCF 1/8W 1.8K 5% ATS R210-R212 4701-222J-C RCF 1/8W 2.2K 5% ATS R213,R214 4701-472J-C RCF 1/8W 4.7K 5% ATS...
  • Page 49 Reference No. Part No. Description C7720-C7722 150F-470J-2-FC CC 50V 47PF 5% AT 3.5X2 C7723-C7729 150F-223K-2-FD CC 50V 0.022μF 10% AT C7730 157D-107M-5-IU CE 16V 100μF 20% RL 5x11 C7731-C7733 150F-104K-2-FC CC 50V 0.1μF 10% AT C7739, C7740 157I-477M-5-X& CE 63V 470μF 20% RL C7741, C7742 157D-476M-5-IM CE 16V 47μF 20% RL 5X7...
  • Page 50 Reference No. Part No. Description Q7724-Q7726 4860-8900-0 TR MPS A13 VCE 100V Q7701-Q7726 4860-8910-0 TR MPS A56 VCE 80V NS RESISTORS R703, R705 4701-102J-C RCF 1/8W 1K 5% ATS R704, R706 4701-104J-C RCF 1/8W 100K 5% ATS R731 4701-102J-C RCF 1/8W 1K 5% ATS R732 4701-333J-C RCF 1/8W 33K 5% ATS...
  • Page 51 Reference No. Part No. Description C6103, C6104 150F-104K-2-FC CC 50V 0.1μF 10% AT C611, C614, C615 157D-226M-5-II CE 16V 22μF 20% RL 5x5 C612 150F-103K-2-FC CC 50V 0.01μF 10% AT 3.5 C613 157D-227M-5-KW CE 16V 220μF 20% RL 6x12 C617, C618, C639 157D-335M-5-II CE 16V 3.3μF 20% RL 5x5 C619-C622...
  • Page 52 Reference No. Part No. Description R6016,R6109 4720-102J-J RMG 1/10W 1K 5% 0805 R6017,R6108 4720-223J-J RMG 1/10W 22K 5% 0805 R602,R604,R606 4701-104J-C RCF 1/8W 100K 5% ATS R607,R609,R611 4701-331J-C RCF 1/8W 330R 5% ATS R608,R610,R612 4701-104J-C RCF 1/8W 100K 5% ATS R6100,R659,R660 4701-202J-C RCF 1/8W 2K 5% ATS...
  • Page 53 Reference No. Part No. Description PSU ASSEMBLY 7100 PCB-N0A01C-PSU PSU ASSEMBLYNA00C CAPACITORS C275 157E-227M-5-PU CE 25V 220μF 20% RL C276 150F-223K-2-FD CC 50V 0.022μF 10% AT C277 150F-103K-2-FC CC 50V 0.01μF 10% AT C278 8910-0091-0 CC 400V 0.01μF +-20% RL C503,C504 150F-102K-2-FC CC 50V 1000pF 10% AT 3.5...
  • Page 54 Reference No. Part No. Description RESISTORS R260 4717-2R2J-2 RMF 1/2W 2.2R 5% AT R261-R263 4718-R22J-2 RMF 1W 0.22R 5% AT SPEAKER ASSEMBLY 7700 PCB-N0A00C-SPK SPEAKER ASSEMBLY CAPACITORS C265-C270 153F-102J-5-IM CM 50V 1000PF 5% RL 5x7 WAFERS / TERMINALS P260,P261 2101-9100-0 JM2422-4M WAFER P262 2101-9090-0...
  • Page 55 Reference No. Part No. Description R516 4701-221J-C RCF 1/8W 220R 5% ATS R517,R528,R536 4701-151J-C RCF 1/8W 150R 5% ATS R519,R520,R537 4701-471J-C RCF 1/8W 470R 5% ATS R521 4701-680J-C RCF 1/8W 68R 5% ATS R522 4701-222J-C RCF 1/8W 2.2K 5% ATS R523 4701-333J-C RCF 1/8W 33K 5% ATS...
  • Page 56 Reference No. Part No. Description C947 157F-474M-5-GM CE 50V 0.47μF 20% RL 4x7 C948 157F-105M-5-GM CE 50V 1μF 20% RL 4x7 C950,C968,C974,C976 150F-223K-2-FD CC 50V 0.022μF 10% AT C951 157F-225M-5-GM CE 50V 2.2μF 20% RL 4x7 C953,C954 153F-272J-5-JM CM 50V 2700PF 5% RL C959,C960 157D-226M-5-GM CE 16V 22μF 20% RL 4X7...
  • Page 57 Reference No. Part No. Description CERAMIC FILTERS M902-M904 2701-0010-1 CF10.7 +-30 M911 2701-0680-0 CF 450 +-1 TUNERS M901 1300-0810-0 TUNER ENV16102G1 UL VER M901 1300-0800-0 TUNER ENV16102GI CE VER MISCELLANEOUS 4131-7701-0 ANTENNA WASHER TRANSISTORS Q902 4851-9230-5 TR 2SC1923-0 HFE 70-140 Q903,Q945 485A-114E-5 TR DTA114ESA ROHM...
  • Page 58 Reference No. Part No. Description R944 4701-104J-C RCF 1/8W 100K 5% ATS R945 4701-392J-C RCF 1/8W 3.9K 5% ATS R946 4701-332J-C RCF 1/8W 3.3K 5% ATS R947,R948 4701-103J-C RCF 1/8W 10K 5% ATS R949 4701-332J-C RCF 1/8W 3.3K 5% ATS R950 4701-684J-C RCF 1/8W 680K 5% ATS...
  • Page 59 Reference No. Part No. Description Q407,Q410 4860-0770-5 TR 2SC2878 (A,B) RL Q408,Q409,Q411,Q412 485C-114E-5 TR DTC114ES RESISTORS R402 4701-102J-C RCF 1/8W 1K 5% ATS R403,R404 4701-222J-C RCF 1/8W 2.2K 5% ATS R405-R408 4701-103J-C RCF 1/8W 10K 5% ATS R409 4701-203J-C RCF 1/8W 20K 5% ATS R410 4701-151J-C RCF 1/8W 150R 5% ATS...

  • Page 60: Exploded View

    EXPLODED VIEW...

  • Page 61: Exploded View Parts List

    EXPLODED VIEW PARTS LIST ITEM Part No. Description 0101 1403-5161-1 BOTTOM CHASSIS T-741 0102 1403-5173-2 REAR PANEL T-741 0103 1403-5183-0 TOP COVER T-741 0104 1403-6511-0 SUBFASCIA T-741 0105 1403-6381-0 FASCIA T-741 0106 4154-0301-0 INPUT BEZEL T-760 0109 4134-9051-0 BRACKET ANGLE 0110 4134-9061-0 BRACKET PHONES...
  • Page 62 ITEM Part No. Description 0146 2904-3008-0000 M3X8MM BINDING HEAD 0147 2954-3006-0000 3X6MM B-TITE (YEL.ZN) 0148 2954-3008-0000 TAPPING 3X8MM B-TITE 0154 2954-2606-3000 SCREW BH 2.6X6 BLACK 0155 2954-2608-3000 SCREW BT 2.6X8 BLACK 0162 2904-3006-0000 SCREW M3X6 0168 2900-3010-3030 SCREW M3X10 W/S&F 0176 3100-3211-0 SILICON SHEET (26X20MM)

  • Page 63: Packing Diagram

    RF CONNECTOR PLUG 4301-4157-0 OWNER’S MANUAL 1497-1062-0 MANUAL POLYBAG 1480-2000-0 CARTON BOX 2113-1155-0 AM LOOP ANTENNA Proprietary information for servicing purposes only. The information herein may not be used com- mercially without the prior written agreement of NAD Electronics International, Toronto, Canada.
  • Page 64 © NAD 2001 NAD ELECTRONICS INTERNATIONAL TORONTO...

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