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13

DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING 

DSP 

U1007 Pin 70 - Clock for external memory, 

100MHz 

U1007 Pin 17 - X1001C output, 24.576MHz 

 

 

 

U1007 Pin 2 - Master clock (Analog), 12.288MHz 

U1007 Pin 2 - Master clock (PCM), 11.2896MHz 

 

 

 

 

U1007 Pin 12 – Left/Right clock (Analog), 48kHz 

U1007 Pin 12 - Left/Right clock (PCM), 44.1kHz 

 

 

Содержание T 175

Страница 1: ...NAD SERVICE MANUAL T 175 T 175 AV Tuner Pre Ampli er AV Tuner Pre Ampli er DRAFT DATE MAY 2008...

Страница 2: ...re trademarks of DTS Inc 1996 2007 DTS Inc All Rights Reserved MODEL T 175 AV TUNER PREAMPLIFIER POWER RATING 120V 60Hz 2A NAD ELECTRONICS INTERNATIONAL 633 GRANITE COURT PICKERING ON CANADA L1W 3K1 D...

Страница 3: ...ER NOTE AH USA CANADIAN MODEL ONLY C CT EUROPEAN MODEL ONLY 2 Safety check out Only U S A model Before returning the product to the customer make leakage current or resistance measurements to determin...

Страница 4: ...rack 46 200 20 kHz 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 Con g 1 FL Track 65 997 Hz 0 08 FR Track 67 997 Hz 0 08 SL Track 68 997 Hz...

Страница 5: ...z 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 source impedance signa...

Страница 6: ...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 Dimensions Width x Height x Depth...

Страница 7: ...ORY 7 NAVIGATION AND ENTER BUTTON 8 VACUUM FLUORES CENT DISPLAY VFD 9 REMOTE SENSOR 10 VOLUME 11 SOURCE 12 LISTENING MODE 13 TONE CONTROLS 14 TONE DEFEAT 15 FRONT INPUT MP 16 PHONES 17 FRONT INPUT JAC...

Страница 8: ...cs from the side panels Remove tapping screw 3 0 x 8 0 x 4pcs from the back panel Refer to Figure No 1 2 Pull both sides of the TOP COVER slightly outwards and tilt approx 35 and then remove in the di...

Страница 9: ...9 WIRING DIAGRAM...

Страница 10: ...RoHS 11 17 012 3936 90 CABLE ASSY 3 WAYS AWG26 2 5P UL2854 L 310 CONN 1 J9006A RoHS 12 17 012 3937 90 CABLE ASSY 5 WAYS AWG26 2 5P UL2854 1533 CONN 1 L 230 320 RoHS J9004A J9005A 13 17 012 3964 90 CAB...

Страница 11: ...11 BLOCK DIAGRAM...

Страница 12: ...PAL NTSC Source Down Memory DAB XM Source Down Tuner Band Must cycle power before change takes effect 9k 10k Source UP Tuner Band Must reselect AM before change takes effect XM 1kHz Test Tone Tuner Ba...

Страница 13: ...U1007 Pin 70 Clock for external memory 100MHz U1007 Pin 17 X1001C output 24 576MHz U1007 Pin 2 Master clock Analog 12 288MHz U1007 Pin 2 Master clock PCM 11 2896MHz U1007 Pin 12 Left Right clock Analo...

Страница 14: ...14 U1007 Pin 9 Serial clock Analog 3 072MHz MCU U2001 Pin 12 X2001A output 20 000MHz HDMI U12 Pin 38 U3 output 28 636MHz...

Страница 15: ...15 U9 Pin 1 DAC_HS OSD Off 31 48kHz U9 Pin 54 DAC_VS OSD On NTSC 60Hz U9 Pin 1 DAC_HS OSD On 15 72kHz U9 Pin 54 DAC_VS OSD On PAL 50Hz U9 Pin 54 DAC_VS OSD Off 60Hz U9 Pin 4 DAC_FLD OSD Off Idle...

Страница 16: ...16 U9 Pin 4 DAC_FLD OSD On NTSC 30Hz U9 Pin 51 PCLK OSD On 27MHz U9 Pin 4 DAC_FLD OSD On PAL 25Hz U9 Pin 51 PCLK OSD Off 27MHz...

Страница 17: ...17 PCB LAYOUT DSP BOARD COPPER SIDE...

Страница 18: ...18 DSP BOARD COMPONENT SIDE...

Страница 19: ...19 KEY BOARD COMPONENT SIDE KEY BOARD COPPER SIDE...

Страница 20: ...20 PRE OUT BOARD COPPER SIDE...

Страница 21: ...21 PRE OUT BOARD COMPONENT SIDE...

Страница 22: ...22 VOLUME BOARD COPPER SIDE...

Страница 23: ...23 VOLUME BOARD COMPONENT SIDE...

Страница 24: ...24 F VIDEO BOARD COPPER SIDE F VIDEO BOARD COMPONENT SIDE...

Страница 25: ...25 MAIN BOARD COMPONENT SIDE...

Страница 26: ...26 MAIN BOARD COPPER SIDE...

Страница 27: ...27 TRIGGER BOARD COMPONENT SIDE TRIGGER BOARD COPPER SIDE...

Страница 28: ...28 COMPONENT BOARD COMPONENT SIDE COMPONENT BOARD COPPER SIDE...

Страница 29: ...29 VIDEO BOARD COPPER SIDE VIDEO BOARD COMPONENT SIDE...

Страница 30: ...30 HDMI BOARD COPPER SIDE...

Страница 31: ...31 HDMI BOARD COMPONENT SIDE...

Страница 32: ...32 CONNECTOR 1 BOARD COMPONENT SIDE...

Страница 33: ...33 CONNECTOR 1 BOARD COPPER SIDE...

Страница 34: ...34 PSU STD BOARD COMPONENT SIDE...

Страница 35: ...4 0 0 7 D8 0 0 6 1 N 4 0 0 7 D8 0 0 5 1 N 4 0 0 7 R 8 0 0 3 0 2 2 1 2 W F u sible C 8 0 0 6 0 0 1 u 2 5 0 V J8 0 1 2 J8 0 1 6 F 8 0 0 1 2 5 0 V J8 0 1 7 M 8 0 0 1 TO Tran sform er th erm ostat 1 2 3 4...

Страница 36: ...23 0 1u 50V C1025 0 1u50V C1024 10u16V R1034 4 7 1 8W 1 VIN 2 VCC 3 GND M1004 R1027 2 2k R1026 2 2k R1025 2 2k C1019 0 1u 50V 1 VCC 2 GND 3 VOUT M1003 JSR1164 D C1020 10u 16V C1015 0 1u 50V 1 VCC 2 GN...

Страница 37: ...VCCF 22 ZEROR 23 ZEROL 24 MSEL 25 MDO 26 MDI 27 MC 28 MS U1015 PCM1791A R108510k R108810k C1163 10u 16V C1164 0 1u 50V R1087 10 L1012 10uH C1165 0 1u 50V C1167 10u 16V R1165 7 5k R1126 7 5k C1204 2700...

Страница 38: ...SC_RX_IN 6 RFU I2C_SCL 7 RFU I2C_SDA 8 VDD8 9 ANT_REV 10 VSS10 11 RESET 12 SLAVE_SEL 1 3 I2 S _ R A TE 1 4 LIN K A C TIV E 1 5 C O M M _ TX _ E N 1 6 V S S 1 6 1 7 V DD1 7 1 8 C O M M _ R X _ P 1 9 C...

Страница 39: ...W ER ON 1 2 S2214 SOURCE DOW N 1 2 S2213 SOURCE UP 1 2 S2212 SPK B N I for T175 1 2 S2211 SPK A N I for T175 1 2 S2215 LISTENING MODE 1 STROBE 2 DATA 3 CLOCK 4 Q1 5 Q2 6 Q3 7 Q4 8 VSS 9 QS 10 QS 11 Q8...

Страница 40: ...6V R6714 N I R6715 0 C6710 N I 50V 3 2 1 U6701 A NJM5532M C6709 220p 50V R6713 47k C6708 10u16V C6704 22u 16V R6703 N I R6704 0 C6703 N I 50V 5 6 7 U6701 B NJM5532M C6702 220p 50V R6702 47k C6701 10u1...

Страница 41: ...MF R6637 N I MF C6624 N I 50V 5 6 7 U6602 B N I C6623 220p 50V R6635 47k 1 16W C6618 22u 16V R6625 N I MF R6626 N I MF C6617 N I 50V 3 2 1 U6602 A N I C6616 220p 50V R6624 47k 1 16W R6727 4 7k 1 16W...

Страница 42: ...SBRIN1 U6002 R2S15205FP C6097 0 1u C6101 0 1u C6121 0 1u C6115 0 1u 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 J60...

Страница 43: ...50V C6150 220p 50V R6005 56k 1 16W 8 4 U6011 C N I 8 4 U6012 C N I C6213 N I 50V C6214 N I 50V C6215 N I 16V C6216 N I 16V C6220 N I 16V C6219 N I 16V C6218 N I 50V C6217 N I 50V 8 4 U6010 C N I 1 LVC...

Страница 44: ...2 1 U9301 A NJM5532M C9314 2 2uF 50V R931743k R9314 2 2k R9316 2 2k E C B Q9301 DTA114EKA R9311 47K R9312 N I R9313 18k 8 4 U9301 C NJM5532M R9326 10k E C B Q9305 2SC4695 R9327 4 7k R9328 0 C9321 22u...

Страница 45: ...0u 25V C2009 0 1u 50V 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 J2007A TO CONN 1 J2007B 1 2 3 4 J8002B TO STANDBY J8002A R2024 0 22 1 2W _ MO R2026...

Страница 46: ...R2056 1k DGND 5V_K 5V_K 5V_K DGND DGND DGND 5V_K 5V_K DGND DGND DGND DGND 5V_K DGND MCU IR _ F IR _ F IR _ R E N 0 2 E N 0 1 E N 0 1 E N 0 2 V F D_ C LK V F D_ DA TA V F D_ C S 4 0 9 4 _ S TB K E Y0 0...

Страница 47: ...XM CONNECTOR R2324 1 8k R2323 10k 1 1A 2 1B 3 1Y 4 2A 5 2B 6 2Y 7 GND 8 3Y 9 3A 10 3B 11 4Y 12 4A 13 4B 14 VCC U2303 SN74HC86DT C2314 10u 16V C2315 0 1u 50V R2341 15k C2316 10u 16V C2317 100p 50V 1 2...

Страница 48: ...9 B 10 A 11 X3 12 X0 13 X 14 X1 15 X2 16 VCC U4003 74HC4052 1 MUTE 2 INA 3 GNDA 4 INB 5 GNDB 6 7 INC 8 GND 9 OUTC2 10 OUTC1 11 12 OUTB2 13 OUTB1 14 OUTA2 15 OUTA1 16 VCC U4001 BA7660FS C4001 0 1u C40...

Страница 49: ...A 12 I O_3 13 I O_0 14 I O_1 15 I O_2 16 VCC U4106 74HC4051 C4137 47u 50V C4138 0 1u 50V C4135 0 1u 50V C4134 47u 50V 1 I O_4 2 I O_6 3 COM_O I 4 I O_7 5 I O_5 6 INH 7 VEE 8 GND 9 C 10 B 11 A 12 I O_...

Страница 50: ...5 1 R77 301 R84 604 L9 3 3uH C49 68pF L10 3 3uH R85 301 1 TP18 R58 1 3k 1 R59 75 R56 75 R60 499 1 TP14 C39 82pF C40 33pF L5 0 22uH L6 0 47uH R61 301 1 VOUT 2 V 3 IN 4 IN 5 V U22 AD8061 R57 75 1 1 TP15...

Страница 51: ...112 RXA_CN 113 RXA_CP 114 TGND114 115 RXA_0N 116 RXA_0P 117 TGND117 118 RXA_1N 119 RXA_1P 120 TGND120 121 RXA_2N 122 RXA_2P 123 TVDD 124 RTERM 125 CVDD125 126 CGND126 127 TVDD127 128 RXB_CN 129 RXB_C...

Страница 52: ...00 20 C219 0 01uF U14 68 C229 0 1uF U14 C218 0 01uF U14 101 C228 0 1uF U14 101 C231 0 1uF U14 57 C220 0 01uF U14 125 C230 0 1uF U14 23 C221 0 01uF U14 109 C223 0 01uF U14 35 C233 0 1uF U14 67 C222 0 0...

Страница 53: ..._ 7 1 PO _ S B L G N D_ 7 1 PO _ S B R G N D_ 7 1 PO _ S U B W G N D_ 7 1 PO _ C E N G N D_ 7 1 DSP_FL DSP_FR GND_DSP DSP_SL GND_DSP DSP_SR GND_DSP DSP_SBL GND_DSP DSP_SBR GND_DSP DSP_SUBW GND_DSP DSP...

Страница 54: ...003 04 005 0020 90 DIODE BRI 4A 70V RS402L D2002 D2007 04 005 0022 90 DIODE BRI 6A 600V RS605 SMD ICS U2016 01 004 0056 90 IC VOLT REG LOW DROPOUT 3 3V 1A SOT 223 LM1117S 3 3 U2006 01 008 0007 90 IC M...

Страница 55: ...0V 20 C2058 C2061 C2063 C2065 6 3X7 7 SMD DIODES D2004 D2005 04 006 0019 00 SMD Diode RECT 1A 400V DO 214AC GS1G M4 GS1G D2001 04 006 0021 90 SMD Diode LL4148 SOD80 SMD TRANSISTORS Q2008 Q2009 Q2010 Q...

Страница 56: ...030 90 FUES CLIP 5 2X20mm WL 210A 10A 250V JUMPERS JMP2 JMP3 17 016 0077 00 Jumper wire Dia 0 5mm L 52 0mm JMP1 JMP4 JMP5 JP8002 17 016 0080 90 Jumper Wire Dia 0 5mm For L Smaller than 14mm VOLUME BOA...

Страница 57: ...MD 330 OHM 1 1 16W 0603 R6118 R6142 R6144 R6148 R6150 R6158 02 007 0288 00 RES SMD 0 OHM 5 1 16W 0603 R6160 R6242 R6243 R6244 R6245 R6246 R6247 R6248 R6249 R6250 R6251 R6252 R6253 R6231 R6232 R6233 R6...

Страница 58: ...8 C6109 C6110 C6111 C6120 C6137 C6140 C6223 C6224 C6227 C6228 C6231 C6232 C6235 C6236 C6239 C6240 C6077 C6080 C6116 03 009 0152 00 SMD E CAP 100uF 16V 20 LOW IMPEDANC 6 3 X 5 8 C6094 C6098 C6117 03 00...

Страница 59: ...C HEX INVERTER SMD SOP 74HCU04D U1010 U1022 01 012 0068 90 IC LOGIC OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS 20PIN TSSOP SN74LVC245APWER U1011 01 012 0074 90 IC PWM CONTROL IC SOP8 TL5001CD U1009 01...

Страница 60: ...0292 00 RES SMD 2 2K OHM 1 1 16W 0603 R1047 R1320 1321 R1037 1041 R1265 1266 02 007 0293 00 RES SMD 33 OHM 5 1 16W 0603 R1073 02 007 0300 00 RES SMD 200K OHM 5 1 16W 0603 R1099 R1108 R1115 R1130 R1140...

Страница 61: ...D 220pF 50V 10 X7R 0603 C1039 03 009 0117 00 CAP CER SMD 330pF 50V 10 X7R 0603 C1058 03 009 0128 00 CAP CER SMD 1200pF 50V 10 X7R 0603 C1048 C1050 C1054 03 009 0128 90 SMD E CAP 470uF 10V 20 GVS V477M...

Страница 62: ...MER ER9 5 225uH RA070228 1 SMD OSCILLATORS X1001C 14 004 0020 90 CRYSTAL OSCILLATOR 24 576MHz 3 3V 50ppm 30pF X1003 AH 14 004 0024 90 CRYSTAL OSCILLATOR 45 1584MHz 3 3V 50ppm 30pF COMPOSITE VIDEO BOAR...

Страница 63: ...20 6 3X7 7 C4112 C4108 C4116 C4124 C4126 03 009 0144 00 CAP ELEC SMD 470uF 16V 20 C4128 4130 C4139 4140 C4145 4146 10X10 5 SMD DIODES D4101 4106 04 006 0021 90 SMD Diode LL4148 SOD80 SMD TRANSISTORS Q...

Страница 64: ...CER SMD 4 7nF 50V 10 X7R 0603 SMD DIODES D2204 2209 04 006 0021 90 SMD Diode LL4148 SOD80 D2203 04 007 0031 00 DIODE ZENER SMD 6 2V 500mW 5 SOD123 MMSZ5234B Q2201 05 004 0030 90 XTR 2SD1918 NPN POWER...

Страница 65: ...R6712 R6715 R6722 R6718 R6801 R6804 R6811 R6807 R6812 R6815 R6822 R6818 R6927 R6928 R6933 R6934 R6939 R6940 R6945 R6946 R6951 R6505 R6516 R6605 R6616 02 007 0295 00 RES SMD 4 7K OHM 1 1 16W 0603 R6705...

Страница 66: ...IGGER CAPACITORS C2314 C2316 C2325 C2328 C2329 03 002 0129 00 CAP ELEC SS 10uF 16V 20 85C RAD HEIGHT 7mm MAX C2318 C2319 C2320 C2324 03 002 0137 00 CAP ELEC SS 1uF 50V 20 85C RAD HEIGHT 7mm MAX COILS...

Страница 67: ...1 00 CAP CER SMD 100pF 50V 10 X7R 0603 C2301 03 009 0113 00 CAP CER SMD 10nF 50V 10 X7R 0603 SMD DIODES D2301 D2302 D2303 D2304 D2305 D2306 04 006 0021 90 SMD Diode LL4148 SOD80 Q2309 Q2311 Q2313 05 0...

Страница 68: ...9316 02 007 0292 00 RES SMD 2 2K OHM 1 1 16W 0603 R9321 9322 02 007 0294 00 RES SMD 470 OHM 5 1 16W 0603 R9318 02 007 0319 00 RES SMD 300 OHM 5 1 16W 0603 R9302 9304 02 007 0357 00 RES SMD 75 OHM 5 1...

Страница 69: ...DUCTORS L1 L2 07 002 0138 90 INDUCTOR AXIAL 180uH 10 2474R 28LK L15 07 002 0148 90 INDUCTOR AXIAL 330uH 2 5A 10 SMD ICS VR201 VR6 01 004 0057 90 IC VOLT REG LM1117S 1 8 LOW DROPOUT 1 8V 1A SOT 223 U20...

Страница 70: ...2 007 0087 00 RES SMD 10K OHM 1 8W 0805 1 R103 R106 02 007 0089 00 RES SMD 0 OHM 1 8W 0805 5 R76 R87 R89 02 007 0311 00 RES SMD 1820 OHM 1 1 10W 0805 R51 R61 R73 R77 R85 R90 R91 R94 R95 02 007 0320 00...

Страница 71: ...C15 C16 C235 C237 03 009 0127 00 CAP CER SMD 1uF 16V 80 20 Y5V 0805 C36 C40 C45 C224 C225 03 009 0132 00 CAP CER SMD 33pF 100V 0805 5 NPO C14 C208 C209 03 009 0146 00 CAP CER SMD 0 082uF 25V 10 X7R 08...

Страница 72: ...8pF SMD HC 49SM 01 CR1 03 28M63636 18 3030 U3 14 004 0022 90 CRYSTAL OSCILLATOR 28 63636MHz 50ppm 3 3V SMD SMD FUSE F200 20 006 0007 90 SMD Fuse SMD2920P075TF 0 75A Circuit Breaker Resettable VDE CONN...

Страница 73: ...73 IC BLOCK DIAGRAM MAINBOARD LM1117 U1016 U1020 U1034 in DSP VR201 VR2 VR6 U7 in HDMI AME8530 U2006 M30280 U2001...

Страница 74: ...74 ATMEGA48 20 U2014 AT24C16 U2002...

Страница 75: ...75 74HC00D U2015 74HC132 U2005 DSP D708E0001BRFP266 U1001...

Страница 76: ...76 SST39VF800 U1004 K4S641632K U1003...

Страница 77: ...77 HEF4094BT U2201 U4107 in Composite U1007 U1008 in DSP U6901 in Pre Out U5501 in AMP L U6003 in Volume 74HC251D U1005 74HCU04D U1018 U1019...

Страница 78: ...78 SN74LVC245 U1010 U1022 TL5001CD U1011...

Страница 79: ...79 SN74HCT245 U1009 SN74LVC257AD U1033 U1035 U1036...

Страница 80: ...80 NJM5532M U1023 U1027 1031 U9301 in F input U6501 U6601 U6701 U6801 in Pre Out U6004 6007 U6018 in Volume PCM1802 U1017...

Страница 81: ...81 TPS3103 U1021 CS8416 U1002...

Страница 82: ...82 BU9450 U1032 PCM1791A U1012 1016...

Страница 83: ...83 HDMI XC9572XL U20 CM1213 8 U2 U11 U16 U24 U32 D2308 in Trigger...

Страница 84: ...84 PCA9517 U5 PCF8574 U10 U201...

Страница 85: ...85 PI3B16233 U9 U13 SN74AHCT244 U200...

Страница 86: ...86 AD8061 U18 U22 U26 AD8063 U17 U21 U25 U27 U29 U30...

Страница 87: ...87 MC141585DW U19...

Страница 88: ...88 TMDS341 U15 U23...

Страница 89: ...89 ADV7320 U28...

Страница 90: ...90 ADV7403 U12 AD9388 U14...

Страница 91: ...91 AD9389B U31 LM2575 VR3 VR4...

Страница 92: ...92 LM1086 VR200 Composite S Video 74HC4051D U4103 4106 BA7660FS U4101 4102 U4001 in Component...

Страница 93: ...93 Component 74HC4052D U4002 4003...

Страница 94: ...94 Volume TPA6120A2DWP U6008...

Страница 95: ...95 R2S15205FP U6001 6002...

Страница 96: ...96 Trigger 74HC86D U2303 ST232BDR U2301 TPS2011A U2302...

Страница 97: ...EXPLODED VIEW A...

Страница 98: ...P H BLK RoHS 3 14 22 001 0379 90 MACHINE SCREW M4 x 8 WASHER HEAD BLK 6 RoHS 15 22 001 0380 90 HEX HEAD SCREW M5 X 12 NI PLT RoHS 4 16 22 001 0384 90 MACHINE SCREW M4 x 14 WASHER HEAD BLK 1 RoHS 17 2...

Страница 99: ...24 031 0007 90 STATIC COVER T775 PET RoHS 1 52 25 005 0122 90 HEX SPACER AF5 5 H19 8 RoHS 2 53 25 005 0124 90 HEX SPACER AF5 5 H9 5 6 RoHS 2 54 25 006 0043 90 PCB SUPPORTER KSS H 9 6mm PCB HOLE 4mm 1...

Страница 100: ...GUIDE BRACKET LEFT T175 RoHS 1 74 25 022 1543 90 PCB GUIDE BRACKET RIGHT T175 RoHS 1 75 25 024 0315 90 PLASTIC FOOT DOME SHAPE RoHS 4 76 25 024 0322 90 DUAL BUTTON T765 GRAPHITE RoHS 4 FOR GRAPHITE VE...

Страница 101: ...S 1 4 24 004 2093 90 T175 OWNER S MANUAL E I P S W WEEE RoHS 1 4 24 004 2225 90 T175 QUICK START MANUAL A3 SIZE RoHS 1 5 24 003 0119 90 POLYBAG MAIN UNIT RoHS 1 6 24 003 0129 90 PROTECTIVE COVER RoHS...

Страница 102: ...102 SERVICE MANUAL T175 AV Tuner Pre Ampli er NAD ELECTRONICS LTD LONDON...

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