NAD-T175-int-sm维修电路原理图.pdf
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1、NAD SERVICE MANUAL T 175 T 175 AV Tuner Pre-Amplifi er AV Tuner Pre-Amplifi er DRAFT DATE: MAY 2008 RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION Manufactured under license under U.S. Patent #s: 5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,226,616; 6,487,535; 7,003,467; 7,212,872 & other U.S. and wo
2、rldwide patents issued & pending. DTS is a registered trademark & the DTS logos and Symbol are trademarks of DTS, Inc. 1996-2007 DTS, Inc. All Rights Reserved. MODELT 175 AV TUNER PREAMPLIFIER POWER RATING 120V 60Hz 2A NAD ELECTRONICS INTERNATIONAL 633 GRANITE COURT, PICKERING, ON, CANADA L1W 3K1 DE
3、SIGNED & ENGINEERED IN CANADA, CUSTOM MANUFACTURED TO NAD SPECIFICATIONS IN CHINA MODELT 175 AV TUNER PREAMPLIFIER POWER RATING 230V 50Hz 1A NAD ELECTRONICS INTERNATIONAL DESIGNED & ENGINEERED IN CANADA, CUSTOM MANUFACTURED TO NAD SPECIFICATIONS IN CHINA RadioFans.CN 收音机爱 好者资料库 3 SERVICE SAFETY PREC
4、AUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference Designator Database Part Number Description F8001*AH 20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO F8001*C,CT 20-001-0066-90 Fuse TIME-LAG
5、 1A/250VAC 5X20mm TSD UL/CSA/VDE/CCC (WALTER) F8002*AH 20-001-0066-90 Fuse TIME-LAG 1A/250VAC 5X20mm TSD UL/CSA/VDE/CCC (WALTER) F8002*C,CT 20-001-0068-90 FUSE TIME-LAG 500mA 250VAC 5X20mm TSD UL/CSA/VDE/CCC WALTER NOTE: : USA, CANADIAN MODEL ONLY. : EUROPEAN MODEL ONLY. 2. Safety check out (Only U.
6、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 supply circuit. Parts marked with the symbol are critical with regard to the risk of fi re and electric shock. CONTENTS DESCRIPTION
7、PAGE SPECIFICATIONS .4 - 6 REAR PANEL / FRONT PANEL VIEW .7 DISASSEMBLY INSTRUCTIONS .8 WIRING DIAGRAM .9 - 10 BLOCK DIAGRAM.11 SPECIAL FUNCTION .12 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING.13-16 PCB LAYOUT .17- 34 SCHEMATIC DIAGRAM .35-53 ELECTRICAL PARTS LIST .54-72 IC BLOCK DIAGRAM .73-96
8、 EXPLODED VIEW .97 EXPLODED VIEW PARTS LIST .98-100 PACKING DIAGRAM .101 RadioFans.CN 收音机爱 好者资料库 4 SPECIFICATIONS PRE AMPLIFIER SECTION Rated distortion (Ext 7.1 1kHz 500mV input ,Pre-out 1V with 30kHz LPF, FL/C/FR) 0.1 % (Ext 7.1 1kHz 500mV input ,Pre-out 1V with 30kHz LPF, SL/SR/BL/BR) 0.1 % S/N R
9、atio (Ext 7.1 1kHz 500mV input ,Pre-out 1V with A-WTD, 1k termination, - 85 dB FL/C/FR/SL/SR/BL/BR) Frequency Response (20 Hz - 20 kHz) 0 1.0 dB Channel Balance (1 dB to -40 dB, 1 kHz) 2 dB (-41 dB to -50 dB, 1 kHz) 3 dB Audio muting at 1 kHz 55 dB Subwoofer out, 500 mV in (THD at 2 V Pre-out, 100 H
10、z) 0.5 % Crosstalk (500 mV input, ref 1V out, 1 kHz) -60 dB Controls Bass (at 500 mV in, ref 1V out, 100 Hz) 10 dB 2 dB Treble (at 500 mV in, ref 1V out, 100 Hz) 10 dB 2 dB DOLBY DIGITAL SECTION Channel Difference (FL ref. Track 30) 1.2 dB Frequency Resporse at Dolby confi g.2 SL Track 46 200 - 20 k
11、Hz 0.8 dB SR Track 47 200 - 20 kHz 0.8 dB C Track 44 200 - 20 kHz 0.8 dB Harmonic Distortion (1 V, Audio LPF, Dolby Confi g 1) FL Track 65 997 Hz 0.08 % FR Track 67 997 Hz 0.08 % SL Track 68 997 Hz 0.08 % SR Track 69 997 Hz 0.08 % C Track 66 997 Hz 0.08 % S/N Ratio (31 for 100mV Pre-out, Track 35) C
12、CIR / ARM 65 dB Audio LPF 70 dB A-wtd 70 dB DOLBY PRO LOGIC II SECTION Frequency Resporse I/P mode : L, R : 1 V in, 1V Pre-out, Ch L/R 40 Hz 0 2.0 dB 20 kHz 0 2.0 dB I/P mode : L=R : 1 V in, 1V Pre-out, Ch /L/R 40 Hz 0 2.0 dB Ch C 20 kHz 0 2.0 dB I/P mode : L=-R : 1 V in, 1V Pre-out, Ch SL/SR 40 Hz
13、0 2.0 dB 20 kHz 0 2.0 dB S/N Ratio (200 mV in, 100mV Pre-out, A-WTD w/ 1 k termination) I/P mode : L, R : 1 kHz, Ch L/R 65 dB I/P mode : L=R : 1 kHz, Ch C 65 dB I/P mode : L=-R : 1 kHz, Ch SL/SR 65 dB THD (2.2 V in, 100mV Pre-out, w/ 80 kHz LPF, 1kHz) 0.2 % MAX VOL PLII Music mode, 1kHz, 1Vp-p, CD i
14、n, 40 dB NOISE connect to T775 Ext 7.1, measure at T775 Spk out, with ref. to 1W S/N (L,R,C,SL,SR) RadioFans.CN 收音机爱 好者资料库 5 DTS SECTION Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 200 10mV Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz 0 1.5 dB Harmonic Distortion (Audio Filter
15、) : FL/FR/C/SL/SR Track 10-14 1 kHz 0.08 % Frequency Response (20 Hz to 20 kHz) Track 26-30 +2/-1.5 dB Subwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10, change to 15 12.5 1.5 dB NOISE MEASUREMENT Surround mode noise (Preout) DVD input 1V (L 20-20kHz -72dB only), volume -12dB, Enhanced
16、Stereo 1 mode, A-WTD -75dB 100mV Preout output reference Surround mode noise (Subwoofer out) DVD input 1V 20-20kHz -75dB (L only), volume -12dB, Enhanced Stereo 1 A-WTD -78dB mode, 1V Preout output reference Surround mode noise (Preout) DVD input 1V (L 20-20kHz -48dB only), maximum volume, Enhanced
17、Stereo 1 mode, A-WTD -50dB 100mV Preout output reference Surround mode noise (Subwoofer out) DVD input 1V 20-20kHz -67dB (L only), maximum volume -12dB, Enhanced A-WTD -72dB Stereo 1 mode, 1V Preout output reference AM TUNER SECTION Input level is expressed as the reading in open circuit of 75-ohm s
18、ource impedance signal generator Usable sensitivity (999/1000 kHz) 60 dBV S/N Ratio (5 mV in) 38 dB THD (5 mV in) 3 % IF Rejection (450 kHz) 36 dB Image Rejection (F+2xIF) 28 dB Selectivity 17 dB Output 170 -20/+30 mV Loop sensitivity (20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66
19、 dB Frequency Response (100 - 2.3 kHz, 5 mV) 6 dB FM TUNER SECTION *C *AH Input level is expressed as the reading in open circuit of 75-ohm source impedance signal generator Usable sensitivity (98 MHz) 15 dB 15 dBv S/N Ratio (60 dB, IHF wtd) Mono 60 dB 60 dB Stereo 63 dB 63 dB Frequency Response (20
20、 Hz - 15 kHz, 60 dB) 0 1.5 dB 0 1.5 dB Channel Separation (60 dB) 100 Hz 30 dB 30 dB 1 k 32 dB 32 dB 10 kHz 30 dB 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dB Capture Ratio (40 dB) 3 dB 3 dB AM Suppression (60 dB, 100% Mod. FM, 30% Mod. AM) 48 dB 48 dB Image Rejection (119.4 MHz)
21、 65 dB RadioFans.CN 收音机爱 好者资料库 6 I.F. Rejection (10.7 MHz) 78 dB Pilot Suppression (98 MHz) 50 dB 50 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono 0.5 % 0.5 % Stereo 0.5 % 0.5 % Auto-Search Sensitivity On 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Dim
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