1. Manuals
  2. Brands
  3. NAD Manuals
  4. Car Receiver
  5. C 425
  6. Service manual

NAD C 425 Service Manual

Stereo am/fm tuner
Hide thumbs Also See for C 425:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
NAD
C 425
S T E R E O
AM/FM TUNER

Advertisement

Table of Contents
loading

Related Manuals for NAD C 425

Summary of Contents for NAD C 425

  • Page 1 C 425 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 Usable Sensitivity (999/1000kHz) ≤30dBµ S/N Ratio (5mV in) ≥38dB THD (5mV in) ≤3% IF Rejection (450kHz) ≥36dB Image Rejection (F+2xIF) ≥28dB Selectivity ≥17dB Output...

  • Page 4: Rear Panel / Front Panel

    REAR PANEL / FRONT PANEL REAR PANEL FM ANTENNA 12V TRIGGER IN AM ANTENNA AC LINE CORD OUTPUT RS-232 IR IN FRONT PANEL POWER ON / OFF AM / FM POWER STATUS INDICATOR DISPLAY BLEND PRESET / TUNE MEMORY DISPLAY AREA FM MUTE / MODE 10.

  • 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

    BLOCK DIAGRAM - 6 -...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM - 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. Stereo Step Connection FM SG Tuning Output Adjustment Adjust Item modulator...

  • Page 11: Pcb Layout

    PCB LAYOUT POWER SUPPLY BOARD LED BOARD KEY BOARD DISPLAY BOARD - 11 -...
  • Page 12 MAIN BOARD - 12 -...

  • Page 13: Schematic Diagram

    SCHEMATIC DIAGRAM KEY / MCU / DISPLAY 6.5V 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 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 Display Board U202: PT6311 SG1/KS1 SG2/KS2 Control SG3/KS3 SG4/KS4 Serial SG5/KS5 DOUT Data SG6/KS6 Interface Dispaly Memory SG7/KS7 Segment SG8/KS8 Driver SG9/KS9 Grid SG10/KS10 Driver SG11/KS11 SG12/KS12 Key Scan Timing Generator Output SG13/GR16 SG14/GR15 SG15/GR14 SG16/GR13 General SG17/GR12 Key Matrix Memory Input...
  • Page 16 Main Board U201: P89LCP936 P2.0/ICB/DAC0/AD03 P2.7/ICA P2.1/OCD/AD02 P2.6/OCA P0.0/CMP2/KBI0/AD01 P0.1/CIN2B/KBI1/AD10 P1.7/OCC/AD00 P0.2/CIN2A/KBI2/AD11 P1.6/OCB P0.3/CIN1B/KBI3/AD12 P0.4/CIN1A/KBI4/DAC1/AD13 P1.5/RST P0.5/CMPREF/KBI5 P89LPC935FDH P3.1/XTAL1 P89LPC936FDH P3.0/XTAL2/CLKOUT P0.6/CMP1/KBI6 P1.4/INT1 P0.7/T1/KBI7 P1.3/INT0/SDA P1.0/TXD P1.2/T0/SCL P1.1/RXD P2.5/SPICLK P2.2/MOSI P2.3/MISO P2.4/SS P89LPC933/934/935/936 ACCELERATED 2-CLOCK 80C51 CPU 4 kb/8 kB/16 kB UART CODE FLASH internal bus...
  • Page 17 Main Board Main Board U203: AT24C08A-10PU U204: MAX232D T1OUT R1IN START STOP R1OUT LOGIC SERIAL T1IN CONTROL H.V. PUMP/TIMING LOGIC T2OUT T2IN LOAD R2OUT R2IN COMP DATA RECOVERY DEVICE ADDRESS COMPARATOR LOAD Main Board DATA WORD EEPROM ADDR/COUNTER U402: NJM78M56FA Y DEC SERIAL MUX /ACK...
  • Page 18 Main Board 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 Main Board U903: LC7218-E...

  • Page 19: Electrical Parts List

    ELECTRICAL PARTS LIST Location Part Number Description DISPLAY ASSY PC BOARD PCB-C42526+DSP PCB ASSY DISPLAY 1725-859A+0000 PCB MAIN/KEY/DIS/PSU/LED CAPACITOR C201 157B-107M+K-LII CE 6.3V 100UF 20% RLT C202 150F-103K+2-FC CC 50V 0.01uF 10% AT 3.5 C210 150F-104K+2-FC CC 50V 0.1UF 10% AT C211 157Q-107M+K-LUI CE 35V 100UF 20% RLT...
  • Page 20 Location Part Number Description WIRE J201A 7012-6688+0 CONN WIRE 3P P=2.5 26AWG MISCELLANEOUS M209 4154-2101+0 VFD HOLDER M210 4814-3TE2+3 IR SENSOR PIC-26043TE2 2460-1961+0 DISPLAY-VFD HNA-10SM55 KEY ASSY PC BOARD PCB-C42526+KEY PCB ASSY KEY C425 1725-859A+0000 PCB MAIN/KEY/DIS/PSU/LED CAPACITOR C230, C231 150F-103K+2-FC CC 50V 0.01uF 10% AT 3.5 WAFER...
  • Page 21 Location Part Number Description PCB-C425D6+MAIN PCB ASSY MAIN 1725-859A+0000 PCB MAIN/KEY/DIS/PSU/LED CAPACITOR C203 150F-223K+2-FD CC 50V 0.022uF 10% AT C204 157D-107M+K-IUI CE 16V 100UF 20% RLT C205 150F-104K+K-II CC 50V 0.1U 10% RLT 5x5 C206, C207, C208, C209 157F-105M+K-IUI CE 50V 1UF 20% RLT 5X11 C213 150F-223K+2-FD CC 50V 0.022uF 10% AT...
  • Page 22 Location Part Number Description C926 153F-333J+K-NLM CM 50V 0.033U 5% RLT 7.5 C927 157F-225M+K-IUI CE 50V 2.2U 20% RLT C928 157D-106M+K-IUI CE 16V 10UF 20% RLT 5X11 C929 157F-224M+K-IUI CE 50V 0.22UF 20% RLT C930 150F-223K+2-FD CC 50V 0.022uF 10% AT C931 157B-107M+K-IUI CE 6.3V 100UF 20% RLT...
  • Page 23 Location Part Number Description C991 153F-102J+K-IM CM 50V 1000P 5% RLT 5x7 C992 150F-103K+2-FC CC 50V 0.01uF 10% AT 3.5 C995 150F-223K+2-FD CC 50V 0.022uF 10% AT C996 157D-107M+K-IUI CE 16V 100UF 20% RLT DIODE D202, D203, D204, D205, D207, D208, D209, D309 4804-1480+2 DIODE 1N4148T AT D401, D402, D403, D404, D405, D406, D407, D408,...
  • Page 24 Location Part Number Description CRYSTAL M905 2300-0440+0 CRYSTAL 7.2MHZ 20PPM M985 2300-1220+0 CRYSTAL 4.332MHZ CERAMIC FILTERS M902, M904 2701-0010+1 CF10.7 +-30 M903 2701-0010+1 CF10.7 +-30 M911 2701-0680+0 CF 450 +-1 TRANSISTOR Q401, Q402 485A-950Y+K TR 2SA950-Y HFE100-200 Q403 4860-0050+K TR SS8050 C/D RLT Q702 4851-9230+5 TR 2SC1923-0(TE2/F/T)
  • Page 25 Location Part Number Description R723 4701-103J+2 RCF 1/8W 10K 5% AT R901 4701-332J+2 RCF 1/8W 3.3K 5% AT R901 4701-333J+2 RCF 1/8W 33K 5% AT R902 4701-220J+2 RCF 1/8W 22R 5% AT R903 4701-102J+2 RCF 1/8W 1K 5% AT R903 4701-123J+2 RCF 1/8W 12K 5% AT R904...
  • Page 26 Location Part Number Description R969 4701-104J+2 RCF 1/8W 100K 5% AT R972 4701-103J+2 RCF 1/8W 10K 5% AT R973 4701-183J+2 RCF 1/8W 18K 5% AT R974 4701-104J+2 RCF 1/8W 100K 5% AT R975 4701-243J+2 RCF 1/8W 24K 5% AT R975 4701-563J+2 RCF 1/8W 56K 5% AT R978...
  • Page 27 Location Part Number Description PSU ASSY PC BOARD PCB-C42526+PSU PCB ASSY PSU PCB-C425D6+PSU PCB ASSY PSU 1725-859A+0000 PCB MAIN/KEY/DIS/PSU/LED CAPACITOR 8910-0049+0 CAP400V 4700P C801 RESISTOR R801 4717-335J+2-S RMF 1/2W 3.3M 5% AT UL SWITCH 0401 5200-3151+0-01 POWER SWITCH MISCELLANEOUS 4132-1061+0 SOLDER TAG M801, M803, M804, M805, M806 4132-1071+0...

  • Page 28: Exploded View

    EXPLODED VIEW - 28 -...

  • Page 29: Exploded View Parts List

    EXPLODED VIEW PARTS LIST ITEM PART NUMBER DESCRIPTION 0100 1402-351F+2 CHASSIS AH NATNC425 0100 1402-351G+2 CHASSIS CE NATNC425 0101 TITA 1402-3532+0 TOP COVER SILVER (C542) 0101 GREY 1402-3533+0 COVER-TOP BLACK (C542) 0102 GREY 1466-5205+3 FASCIA BLACK NATNC425 0102 TITA 1466-5206+3 FASCIA SILVER NATNC425 0105 1806-3541+2...
  • Page 30 ITEM PART NUMBER DESCRIPTION 0136 7009-3110+0 AC CORD (SEMKO) 0137 3714-5706+0 LED LENS (412) CLEAR SAN 0140, 0141 2954-3008+0000 SCREW B-TITE BIND M3X8 0146 2954-2006+0000 TAPPING SCREW 2X6 0160 2600-4008+0973 FLAT WASHER 4*9.7*0.8 NOTE: The components identified by mark are critical for risk of fire and electrical shock. Replace only with part number specified.

  • Page 31: Packing Diagram

    WHITE PAPER 4060-0530+0 GREENCELL 3A SIZE GP24G2 8912-0055+0 REMOTE CONTROL NATNC425 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. - 31 -...
  • Page 32 © NAD 2006 NAD ELECTRONICS INTERNATIONAL TORONTO...

Table of Contents