Nad T-175 Service Manual

DRAFT DATE: MAY 2008

NAD

SERVICE MANUAL

T 175

AV Tuner Pre-Ampliﬁer

T 175

AV Tuner Pre-Ampliﬁer

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 worldwide 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.

NAD ELECTRONICS INTERNATIONAL

633 GRANITE COURT, PICKERING, ON, CANADA L1W 3K1

MODEL T 175 AV TUNER PREAMPLIFIER

POWER RATING 120V 60Hz 2A

DESIGNED & ENGINEERED IN CANADA, CUSTOM

MANUFACTURED TO NAD SPECIFICATIONS IN CHINA

NAD ELECTRONICS INTERNATIONAL

MODEL T 175 AV TUNER PREAMPLIFIER

POWER RATING 230V 50Hz 1A

DESIGNED & ENGINEERED IN CANADA, CUSTOM

MANUFACTURED TO NAD SPECIFICATIONS IN CHINA

SERVICE SAFETY PRECAUTIONS

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 TSD UL/CSA/VDE/CCC (WALTER) F8002*AH TSD UL/CSA/VDE/CCC (WALTER) F8002*C,CT 5X20mm TSD

UL/CSA/VDE/CCC WALTER

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 determine

that exposed parts are acceptably insulated from supply circuit.

20-001-0066-90 Fuse TIME-LAG 1A/250VAC 5X20mm

20-001-0068-90 FUSE TIME-LAG 500mA 250VAC

Parts marked with the symbol

are critical with regard to the risk of ﬁre and electric shock.

CONTENTS

DESCRIPTION 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

EXPLODED VIEW .................................................................................................................................97

EXPLODED VIEW PARTS LIST ....................................................................................................98-100

PACKING DIAGRAM ...........................................................................................................................101

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 Ratio (Ext 7.1 1kHz 500mV input ,Pre-out 1V with A-WTD, 1kΩ 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 Hz) ≤ 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 conﬁg.2 SL Track 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 Conﬁg 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) CCIR / 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 0 ± 2.0 dB 20 kHz 0 ± 2.0 dB S/N Ratio (200 mV in, 100mV @ Pre-out, A-WTD w/ 1 kΩ 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 in, ≥ 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)

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) : 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 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 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 source impedance signal generator Usable sensitivity (999/1000 kHz) ≤ 60 dBμV 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 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 dBμ ≤ 15 dBμv S/N Ratio (60 dB, IHF wtd) Mono ≥ 60 dB ≥ 60 dB Stereo ≥ 63 dB ≥ 63 dB Frequency Response (20 Hz - 15 kHz, 60 dBμ) 0 ± 1.5 dB 0 ± 1.5 dB Channel Separation (60 dBμ) 100 Hz ≥ 30 dB ≥ 30 dB 1 k ≥ 32 dB ≥ 32 dB 10 kHz ≥ 30 dB ≥ 30 dB Alternate Channel Selectivity (40 dBμ, ± 400 kHz) ≥ 60 dB ≥ 45 dB Capture Ratio (40 dBμ) ≤ 3 dB ≤ 3 dB AM Suppression (60 dBμ, 100% Mod. FM, 30% Mod. AM) ≥ 48 dB ≥ 48 dB Image Rejection (119.4 MHz) − ≥ 65 dB

I.F. Rejection (10.7 MHz) ≥ 78 dB − Pilot Suppression (98 MHz) ≥ 50 dB ≥ 50 dB THD (60 dBμ, 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 dBμ ≥ 24 dBμ Off ≤ 15 dBμ ≤ 15 dBμ RDS decode Sensitivity ≤ 26 dBμ −

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth) 435 x 134 x 353 mm Net Weight 9.45 Kg (20.79 lbs) Shipping Weight 13.9 Kg (30.58 lbs)

REAR PANEL / FRONT PANEL VIEW

REAR PANEL

1. 7.1 CH INPUT

2. AUDIO PREOUT

3. MP DOCK

4. FM,AM ANTENNA INPUT

5. XM MODULE INPUT(AH) DAB MODULE INOUT(C,CT)

6. RS-232

FRONT PANEL

7. +12V TRIGGER OUT

8. IR IN/OUT

9. AUDIO/VIDEO 1~6 IN

10. MONITOR(S-VIDEO,VIDEO)

11. AUDIO/VIDEO 3/4 OUT

12. ZONE 2,3,4

13. HDMI

14. DIGITAL AUDIO IN/OUT

15. COMPONENT IN/OUT

16. AC POWER INLET

17. SWITCHED AC OUTLET

18. POWER

1. POWER BUTTON

2. STANDBY LED

3. INFO

4. AM/FM/DB

5. TUNER MODE

6. MEMORY

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 JACKS

18. MP/MIC INPUT

DISASSEMBLY INSTRUCTIONS

1. Remove machine screws M4.0 x 8.0 (x 6pcs) from the side panels. Remove tapping screw 3.0 x 8.0 (x 4pcs) from the back panel. Refer to Figure No. 1.

Figure No. 1

2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35 ° and then remove in the direction as indicated. Refer to Figure No. 2.

Figure No. 2

WIRING DIAGRAM

WIRING DIAGRAM PARTS LIST

Item Database Part Number Description Remark

1 17-012-3970-90 CABLE ASSY 4 WAYS AWG26 2.5P UL2468 PSU-J8002A L=600mm (RoHS) 2 17-012-3966-90 CABLE ASSY 1 WAY AWG18 UL1672 BLUE PSU-J8011 L=120mm FASTON 4.8mm (RoHS) 3 17-012-3967-90 CABLE ASSY 1 WAY AWG18 UL1672 BROWN PSU-J8012 L=100mm FASTON 4.8mm (RoHS) 4 17-012-3940-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=110 VOL BD (ROHS) J6004A/B 5 17-012-3999-90 CABLE ASSY 1 WAY AWG18 UL1007 L=100MM VOL BD-J6103A W/ HEADER (RoHS) 6 17-012-4000-90 CABLE ASSY 2 WAYS AWG18 UL1007 3.96P VOL BD L=340MM (RoHS) J1002B/J6102A 7 17-012-3938-90 CABLE ASSY 1 WAY AWG18 UL1007 L=320MM DSP BD-J1002A

W/ HEADER (RoHS) 8 17-012-3971-90 CABLE ASSY 20 WAYS AWG28 UL2651 L=120mm KEY BD-J2002B PCB MOUNT (RoHS) 9 17-012-3171-90 CABLE ASSY 6 WAYS AWG26 2.5P UL1533 L=160mm V6 BD-J2006B (RoHS) 10 17-012-3404-90 CABLE ASSY 6 WAYS AWG26 2.5P UL1007 L=150mm V6 BD-J2005B (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 CABLE ASSY 3 WAYS AWG26 2.5P UL2854 L=230 CONN#1 (RoHS) J9008A/B 14 17-012-2924-90 CABLE ASSY 1 WAY AWG18 UL1015 BLACK MCU BD L=260MM W/ RING TERMIMAL (RoHS) JP2004A 15 17-012-3930-90 CABLE ASSY 4 WAYS AWG26 2.5P UL1533 L=160mm MCU VD-J2008A (RoHS) 16 17-010-0122-90 FFC CABLE 17 PINS P1.25 L=360MM 15 & 16 PINS TUNER-J6003A VOID (RoHS) 17 17-012-2875-90 Cable assy 1 way AWG=16 UL 1015 Green/Yellow CHASSIS GND, L=100mm(RoHS) AC OUTLET

GND 18 17-012-3938-90 CABLE ASSY 1 WAY AWG18 UL1007 L=320MM TUNER-J9104A W/ HEADER (RoHS) 19 17-012-3965-90 CABLE ASSY 3 WAYS AWG26 2.5P UL2547 L=500 TUNER-J2016A (RoHS) 20 17-012-3968-90 CABLE ASSY 1 WAY AWG18 UL1672 BLUE L=80mm J8015, J8017 (RoHS) 21 17-012-3969-90 CABLE ASSY 1 WAY AWG18 UL1672 BROWN L=80mm J8013, J8016 (RoHS)

22 17-012-3972-90 CABLE ASSY 26 WAYS AWG28 UL2651 L=450mm J2301C (RoHS) 23 17-012-4001-90 CABLE ASSY 1 WAY AWG18 UL1007 L=420 TUNER W/ HEADER (RoHS) J9101A,J9102A

BLOCK DIAGRAM

SPECIAL FUNCTION

Function Keys Notes

Factory Reset AH Source Down + Front/MP Factory Reset C Source UP + Front/MP Toggle IR Channel Source Down + Power Only for v1.08 or higher. Check MCU Version Source Down + Source UP For v1.03 or higher, this checks all versions. Check DSP Version Source Down + Listening Mode Only for v1.02 or older. Check Current Video Mode Source Down + Tone Controls MIC Test Source Down + Tone Defeat VFD Test Source Down + Display 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 Band + Tuner Mode XM must be selected ﬁrst. XM Signal Strength Tuner Mode for 0.5 seconds XM must be selected ﬁrst. XM Diagnostics Mode Tuner Mode for 3 seconds XM must be selected ﬁrst. Check DAB Module Version Tuner Mode for 3 seconds DAB must be selected ﬁrst. Enter Diagnostics Mode Source Down + Enter Diagnostic Mode Down Source Down + Cursor Right Diagnostic Mode Up Source Down + Cursor Left Power Off All Zones Power Toggle or Power Off for 3 seconds