NAD C 730 Service Manual
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NAD C 730 Service Manual

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NAD
C 730
STEREO
RECEIVER

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Summary of Contents for NAD C 730

  • Page 1 C 730 STEREO 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 M151 *AH 5120-0037-0 FU T3.15A 250V UL/CSA 5X20MM M152 *C 5100-2530-1B T2.5A/250V IEC M154 *AH 5120-0052-0 FUSE T1.6A 250V 5X20MM UL/CSA...

  • Page 3: Specifications

    SPECIFICATIONS POWER AMPLIFIER SECTION Rated Distortion ≤0.08% (THD 20Hz-20KHz, 30W, 8 ohm) ≤0.1% (THD 1KHz, 30W, 4 ohm) Input Sensitivity (ref. 30W 8 ohm, 1KHz) 350+/-30mV ≥-85dB S/N Ratio (A-wtd, 1K ohm, 500mV CD in, 1KHz) Frequency Response (500mV CD in, 1W, 20Hz-20KHz) 0±0.8dB Channel Balance ≤1dB...
  • Page 4 FM TUNER SECTION Frequency Range: 87.5 - 108 MHz Step 50 KHz 87.5 - 108 MHz Step 50 KHz Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator. ≤15dBµ ≤15dBµ Usable Sensitivity (Mono, 98MHz) ≥72dB ≥72dB S/N Ratio (60dBµ, IHF wtd)

  • Page 5: Rear Panel / Front Panel

    REAR PANEL / FRONT PANEL REAR PANEL 1. FM ANTENNA 9. PRE OUT 2. AM ANTENNA 10. NAD-LINK IN, OUT 3. DISC INPUT 11. SOFT CLIPPING 4. CD INPUT 12. 12V TRIGGER OUT 5. VIDEO INPUT 13. SPEAKERS 6. AUX INPUT 14.

  • Page 6: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels. Remove tapping screw 3.0 x 8.5 ( 5 ) from the back panel. Refer to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove in the direction as indicated by the arrow 7 .

  • Page 7: Block Diagram

    BLOCK DIAGRAM...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM...

  • Page 9: Adjustment Points Diagram

    ADJUSTMENT POINTS DIAGRAM 1. TUNER 2. MAIN BOARD Testing Point Testing Point Testing Point Testing Point...

  • Page 10: Instrument Setup

    INSTRUMENT SETUP 1. FM MEASUREMENT OUTPUT OUTPUT Fig. 1 TERMINAL TERMINAL DISTORTION UNIT SIGNAL ANALYZER GENERATOR P901 VOLTMETER MILLIVOLT METER OSCILLOSCOPE ANTENNA OUTPUT Fig. 2 TERMINAL TERMINAL DISTORTION UNIT STEREO SIGNAL ANALYZER GENERATOR GENERATOR OSCILLOSCOPE VOLTMETER 2. RDS MEASUREMENT ANTENNA TERMINAL Fig.

  • Page 11: Important Notes

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

  • Page 12: Pcb Layout

    PCB LAYOUT KEY BOARD PHONE BOARD TOP VIEW BOTTOM VIEW LED BOARD SECONDARY BOARD PRIMARY BOARD...
  • Page 13 MAIN BOARD...
  • Page 14 TUNER BOARD PSU BOARD POWER SWITCH BOARD SPEAKER BOARD...

  • Page 15: Schematic Diagram

    SCHEMATIC DIAGRAM MAIN BOARD NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED.
  • Page 16 TUNER BOARD NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED.
  • Page 17 KEY BOARD U202 24C08 R219 1K R218 1K R243 100K R242 100K R241 100K R244 100K R245 100K R246 100K R263 100K R264 100K R265 100K R266 100K R267 100K R268 100K R269 100K R270 100K R271 100K R272 100K R273 100K R274...

  • Page 18: Ic Block Diagram

    IC BLOCK DIAGRAM U201: LC866448B S15/T15 S14/T14 S13/T13 S12/T12 S11/T11 S10/T10 S9/T9 S8/T8 VSS2 S7/T7 P10/SO0 S6/T6 P11/SI0/SB0 S5/T5 P12/SCK0 S4/T4 P13/SO1 S3/T4 P14/SI1/SB1 S2/T2 P15/SCK1 S1/T1 P16/BUZ S0/T1 Interrupt Control A15-A0 Stand-by Control D7-D0 EPROM Control DASEC EPROM(48KB) X'tal Bus Interface BASE TIMER SIO0...
  • Page 19 U202: 24C08 START STOP LOGIC SERIAL CONTROL H.V. PUMP/TIMING LOGIC LOAD COMP DATA RECOVERY DEVICE ADDRESS COMPARATOR LOAD DATA WORD EEPROM ADDR/COUNTER Y DEC SERIAL MUX /ACK LOGIC U401: TC9273N 27 S1 26 S2 25 S3 (L-ch) (R-ch) 24 S4 10bit 10bit 23 S5...
  • Page 20 U501: NJM4558D U603: NJM78M U702, U703: NJM5532 U704: TL072CP AMPLIFIER 1 AMPLIFIER 2 OUTPUT INVERTING INPUT OUTPUT Ð + + Ð NON-INVERTING INVERTING INPUT INPUT NON-INVERTING V Ð INPUT OUTPUT INPUT U901: LA1837 3 rd 5 th DECODER ANTI-BIRIDE RF.AMP BUFF MUTE P-DET...
  • Page 21 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 U903: LC7218 REFERENCE PHASE DETECTOR...

  • Page 22: Electrical Parts List

    ELECTRICAL PARTS LIST Reference No. Part No. Description LED ASSEMBLY PCB BOARD 01000 PCB-N0940C-LED LED ASSEMBLY D211 3700-3517-RG LED RED/GREEN (L-469HGW) MAIN ASSEMBLY PCB BOARD 02000 PCB-N0940C-MAIN MAIN ASSEMBLY CAPACITORS C330, C332 150F-104K-2-FC CC 50V 0.1µF 10% AT C333 150F-223K-2-FD CC 50V 0.022µF 10% AT C401-C418 150F-101K-2-FC...
  • Page 23 Reference No. Part No. Description C833 150F-223Z-5-UG CC 50V 0.022µF +80/-20% C840-C843 150F-101J-5-IF CC 50V 100pF 5% RL 5x3.5 C844 153F-103J-5-IM CM 50V 0.01µF 5% RL 5x7 C845 157B-107M-5-KMK CE 6.3V 100µF 20% RL C846 150F-223Z-5-UG CC 50V 0.022µF +80/-20% C847, C848 157D-476M-5-IMK CE 16V 47µF 20% RL...
  • Page 24 Reference No. Part No. Description Q827, Q828 485A-1939-5 TR 2SA1939-0 HFE 80-160 Q829, Q830 4860-0190-5 TR 2SC 1845 (F.E) RL Q831 485C-123J-5 TR DTC123JSA ROHM Q832 4850-992F-5 TR 2SA992 HFE 300-600 Q833, Q834 4860-0190-5 TR 2SC 1845 (F.E) RL Q835, Q836 4851-241A-5 TR RN1241-A Q837...
  • Page 25 Reference No. Part No. Description R723, R724 4701-472J-C RCF 1/8W 4.7K 5% ATS R725, R726 4701-103J-C RCF 1/8W 10K 5% ATS R727-R730 4701-393J-C RCF 1/8W 39K 5% ATS R731, R732 4701-121J-C RCF 1/8W 120R 5% ATS R769, R770 4701-101J-C RCF 1/8W 100R 5% ATS R801, R802 4701-272J-C RCF 1/8W 2.7K 5% ATS...
  • Page 26 Reference No. Part No. Description U303 3130-6650-0 IC 74LS00 QUAD 2-INPUT U401 3130-8160-0 IC TC9273N ANALOG SWITCH U501 3130-0890-0 IC NJM4558D DUAL OP AMP. U601 3130-2520-3 IC 7812 12V REGULATOR U602 3130-3800-0 IC UPC79M12HF REGULATOR U603 3130-8190-0 IC NJM78M56FA 5.6V U701 3130-3410-0 IC LB1642 MOTOR DRIVER...
  • Page 27 Reference No. Part No. Description DIODES D201 4804-1480-C DIODE 1N4148 ATS D202 4804-0040-1 DIODE 1N4004 AL D203 4837-5B61-2 DZ 1/2W 5.45-5.73 ROHM D204,D209,D210 4804-1480-C DIODE 1N4148 ATS D211 4837-5B11-2 DZ 1/2W 4.94~5.20V ROHM D212 4804-1480-C DIODE 1N4148 ATS COIL L201 1801-220K-M COIL 22µH 10% AL BL7 INFRA-RED SENSOR...
  • Page 28 Reference No. Part No. Description C110 157E-227M-5-PU CE 25V 220µF 20% RL DIODES D101 4804-1480-C DIODE 1N4148 ATS D102-D105 4804-0040-1 DIODE 1N4004 AL RELAY M103 4500-0890-0 RELAY 12VDC,250VAC,10A FUSE M151 5120-0037-0 FU T3.15A 250V UL/CSA 5x20MM M152 5100-2530-1B T2.5A/250V IEC M154 5120-0052-0 FUSE T1.6A 250V 5x20MM UL/CSA...
  • Page 29 Reference No. Part No. Description C946 157F-105M-5-GM CE 50V 1µF 20% RL 4x7 C947 157F-474M-5-GM CE 50V 0.47µF 20% RL 4x7 C948 157F-105M-5-GM CE 50V 1µF 20% RL 4x7 C949, C950 150F-223K-2-FD CC 50V 0.022µF 10% AT C951 157F-225M-5-GM CE 50V 2.2µF 20% RL 4x7 C953, C954 150D-272K-2-FC CC 16V 2700pF 10% AT...
  • Page 30 Reference No. Part No. Description TUNER M986 1300-0726-0 TUNER ENV172D3G1 TRANSISTORS Q901 *C 485C-945P-5 TR 2SC945P HFE 200-400 Q902 4851-9230-5 TR 2SC1923-0 HFE 70-140 Q903 485A-114E-5 TR DTA114ESA ROHM Q922, Q923 4860-1590-5 TR 2SC1740S Q942 4860-1590-5 TR 2SC1740S Q943, Q944 4860-8120-0 TR 2SD 1468 S Q945, Q980, Q981...
  • Page 31 Reference No. Part No. Description R974 4701-104J-C RCF 1/8W 100K 5% ATS R975 *AH 4701-223J-C RCF 1/8W 22K 5% ATS R975 *C 4701-513J-C RCF 1/8W 51K 5% ATS R981 4701-101J-C RCF 1/8W 100R 5% ATS R983 4701-104J-C RCF 1/8W 100K 5% ATS R984 4701-105J-C RCF 1/8W 1M 5% ATS...

  • Page 32: Exploded View

    EXPLODED VIEW...

  • Page 33: Exploded View Parts List

    EXPLODED VIEW PARTS LIST ITEM Part No. Description 0101 *AH 1403-7071-0 REAR PANEL C730 (AH) 0101 *C 1403-7072-0 REAR PANEL C730 (C) 0102 1403-7080-0 TOP COVER C730 0103 1403-7090-0 SUB-FASCIA C730 0104 1403-7100-0 BOTTOM COVER C730 0105 1403-7110-0 BOTTOM CHASSIS C730 0106 1466-8200-0 FASCIA C730...
  • Page 34 ITEM Part No. Description 0200 *AH 2113-1662-0 AC OUTLET 2 PIN 15A 125VAC (AH) 0301 3100-5101-0 PC SHEET 50X7X0.25 1556 3100-3211-0 SILICON SHEET (26X20MM) J206C 7010-1660-0 FLEXIBLE CABLE 35P L220 P1.25 T901 1806-3546-0 X'FORMER I/P 120/230V N094XC NOTE: The components identified by mark are critical for risk of fire and electrical shock.

  • Page 35: Packing Diagram

    4301-4869-1 INSTRUCTION MANUAL C730 1497-1062-0 MANUAL POLYBAG 1480-1900-1 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 36 © NAD 2001 NAD ELECTRONICS INTERNATIONAL TORONTO, CANADA...

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