NAD C 422 Service Manual
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NAD C 422 Service Manual

Stereo am/fm tuner
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NAD
C 422
S T E R E O
AM/FM TUNER

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Summary of Contents for NAD C 422

  • Page 1 C 422 S T E R E O AM/FM TUNER...

  • Page 2: Table Of Contents

    SERVICE SAFETY PRECAUTIONS Safety check out (Only U.S.A. model) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer.

  • Page 3: Specifications

    SPECIFICATIONS AM TUNER SECTION Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator ≤30dBµ Usable Sensitivity (999/1000kHz) ≥38dB S/N Ratio (5mV in) ≤3% THD (5mV in) ≥36dB IF Rejection (450kHz) ≥28dB Image Rejection (F+2xIF) ≥17dB Selectivity Output...

  • Page 4: Rear Panel / Front Panel

    +12V TRIGGER 1. FM ANTENNA 4. IR IN 2. AM ANTENNA 5. 12V TRIGGER IN 3. OUTPUT 6. AC LINE CORD FRONT PANEL RDS Stereo Tuner C 422 PRESET / TUNE FM MUTE PRESET BLEND MEMORY / MODE AM / FM...

  • Page 5: 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 6: Block Diagram

    B L OC K DIA G R A M - 6 -...

  • Page 7: Wiring Diagram

    WIR ING DIA G R A M K E Y B OAR D P OWE R S UP P LY B OAR D T R ANS F OR ME R LE D B OAR D WHIT E B LUE Y E LLOW MAIN B OAR D - 7 -...

  • Page 8: Adjustment Points Diagram

    ADJUSTMENT POINTS DIAGRAM - 8 -...

  • Page 9: Instrument Setup

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

  • Page 10: Alignment Procedures

    ALIGNMENT PROCEDURES 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 47Kohm resistor unless otherwise noted. Connection FM SG Stereo mod- Tuning Output Adjustment Adjust Item Step...

  • Page 11: Pcb Layout

    P C B L AY OUT P OWE R S UP P LY B OA R D L E D B OA R D K E Y B OA R D - 11 -...
  • Page 12 MAIN BOARD - 12 -...

  • Page 13: Schematic Diagram

    SCHEMATIC DIAGRAM KEYBOARD / DISPLAY MODE DISPLAY PRESET/TUNE < FM/AM FM MUTE PRESET/TUNE > STORE BLEND NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. - 13 -...
  • Page 14 TUNER M987 LEFT OUT RIGHT OUT NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED. - 14 -...

  • Page 15: 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 U202: 24C08 U402: NJM78M56FA START STOP LOGIC SERIAL CONTROL H.V. PUMP/TIMING LOGIC LOAD COMP...
  • Page 16 U701: LM393D Dual-In-Line/SOICPackage 3.5µA 100µA 3.5µA 100µA P3&P5 Non-inverting Input P1&P7 Inverting Input P2&P6 GND P4 U901: LA1837 3 rd 5 th DECODER ANTI-BIRIDE RF.AMP BUFF MUTE P-DET STEREO Ø AM IF PILOT 304kHz COMP S-METER AM/FM S-METER S-CURVE IF-BUFF TUNING STEREO DRIVE...
  • Page 17 U902: LC72723M V REF FLOUT Vddd Vdda CLOCK RECOVERY REFERENCE (57kHz) (1187.5Hz) VOLTAGE Vssd Vssa V REF 57kHz RDDA DATA MPXIN ANTIALIASING SMOOTHING (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 18: Electrical Parts List

    ELECTRICAL PARTS LIST Reference No. Part No. Description KEY ASSY PC BOARD PCB-N0A50C-KEY PCB ASSY KEY N0A50C CAPACITOR C201 157B-107M-5-KMK CE 6.3V 100µF 20% RL C202 153F-103J-5-KM CM 50V 0.01µF 5% RL COIL L201 1801-220K-M COIL 22µH 10% AL BL7 WAFER/CONNECTOR J202A 2101-1581-0...
  • Page 19 Reference No. Part No. Description M218 4814-3TE2-3 IR SENSOR PIC-12043TE2 LED ASSY PC BOARD PCB-N0A50C-LED PCB ASSY LED N0A50C D211 3700-3517-RG LED RED/GREEN (L-469HGW) WIRE J201B 7703-1320-2004 3P CONN WIRE ASSY L=320 PC BOARD 1725-080B-0100 PCB MAIN/KEY/VFD N0A50C PSU ASSY PC BOARD PCB-N0A50C-PSU PCB ASSY PSU N0A50C...
  • Page 20 Reference No. Part No. Description C401,C402,C403,C404 153F-224J-5-MIB CM 50V 0.22µF 5% RL 7x5 C405 157D-228M-5-X9E CE 16V 2200µF 20% RL 12.5x20 C406,C407 157D-108M-5-S9K CE 16V 1000µF 20% RL 10x20 C408,C409 157D-227M-5-OMK CE 16V 220µF 20% RL 8x7 C410,C411,C420,C706 150F-104K-5-II CC 50V 0.1µF 10% RL 5x5 C412,C414,C906,C942 157D-107M-5-KUK CE 16V 100µF 20% RL 6x11...
  • Page 21 Reference No. Part No. Description TUNER M901 1300-0726-0 TUNER ENV172D3G1 COIL L701 1807-273J-PS COIL 27MH 5% 8.3X9.7 L901 1801-220K-M COIL 22µH 10% AL BL7 L905,L985,R912 1801-101K-M COIL 100µH 10% WAFER/CONNCETOR 0205 *AH 2107-0641-0 ANT-TERMINAL F-TYPE 0205 *CE 2107-0681-0 ANT-TERMINAL (DIN-TYPE) J201A 2102-031S-004 3 PIN ST.
  • Page 22 Reference No. Part No. Description R232,R253-R256,R281-R284,R703, 4701-103J-2 RCF 1/8W 10K 5% AT R705,R707,R714,R715,R722,R723, R906,R915,R927,R947,R948,R954, R972,R989,R991 R403 4701-100J-2 RCF 1/8W 10R 5% AT R701,R961,R962,R988 4701-471J-2 RCF 1/8W 470R 5% AT R704,R712 4701-182J-2 RCF 1/8W 1.8K 5% AT R706 4701-152J-2 RCF 1/8W 1.5K 5% AT R708,R711,R944,R963,R964,R969, 4701-104J-2 RCF 1/8W 100K 5% AT...
  • Page 23 Reference No. Part No. Description TRANSISTOR Q401,Q402 485A-950Y-5 TR 2SA950-Y HFE 100-200 Q403 4860-0050-5 TR SS8050 C/D SAMSUNG RL Q702,Q703,Q902 4851-9230-5 TR 2SC1923-0 HFE 70-140 Q901 *CE 485C-945P-5 TR 2SC945P HFE 200-400 Q903,Q945,Q981 485A-114E-5 TR DTA114ESA ROHM Q922,Q923,Q942 4860-1590-5 TR 2SC1740S Q943,Q944 4860-8120-G TR 2SD1468S TPS ROHM...

  • Page 24: Exploded View

    EXPLODED VIEW - 24 -...

  • Page 25: Exploded View Parts List

    EXPLODED VIEW PARTS LIST ITEM Part No. Description 0100 *AH GREY/*AH TI 1402-351A-1 CHASSIA C422 (AH) 0100 *CE GREY/*CE TI 1402-351B-1 CHASSIA C422 (C) 0101 *AH GREY/*CE GREY 1402-3531-0 TOP COVER BLACK (C542) 0101 *AH TI/*CE TI 1402-3532-0 TOP COVER SILVER (C542) 0102 *AH GREY/*CE GREY 1466-5201-1...
  • Page 26 ITEM Part No. Description 0136 *AH GREY/*AH TI 7009-3100-2 AC CORD 18AWGX2 0136 *CE GREY/*CE TI 7009-3110-0 AC CORD (SEMKO) 0137 3714-5706-0 LED LENS (412) CLEAR SAN 0140 2954-3008-0000 TAPPING 3X8MM B-TITE 0141 2954-3008-0000 TAPPING 3X8MM B-TITE 0143 2600-3005-0803 METAL WASHER M3X0.5X8MM 0144 2954-3008-0000 TAPPING 3X8MM B-TITE...

  • Page 27: Packing Diagram

    AM LOOP ANTENNA 2103-6101-0 RF CONNECTION PLUG (F-TYPE) 1450-2520-0 WHITE PAPER 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. - 27 -...
  • Page 28 © NAD 2004 NAD ELECTRONICS INTERNATIONAL TORONTO...

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