
16
AMPLIFIER ADJUSTMENT
Idle Current
1. Rotate R5221 fully clockwise.
2. Connect DC millivoltmeter to P5501 (i.e. Across half of R5228 and R5530, 0.22 Ohm resistor).
3. Turn on the unit.
4. Adjust R5221 for
2mV +/- 0.2mV
reading on voltmeter.
5. Leave power on for at least 5 min, and check for idle current again.
6. Repeat for other channels.
CHANNEL JUMPER VR
FL
P5501
R5521
FR
P5001
R5021
C
P5101
R5121
SL
P5601
R5621
SR
P5201
R5221
BS
P5701
R5721
BSR
P5301 R5321
ISC Adjustment
A. Rotate R8214 fully clockwise.
B. Use 500mV, 1kHZ sine wave, EXT7.1 input, 8ohm loading to all channels.
C. Increase the output power of FL/SL/BSL channels to 80W(25.3V).
D. Note the THD readings should be larger than 0.2%.
E. Rotate R8214 anti-clockwise slowly until the THDreadings is below 0.1%.
F. Repeat for R8217 using FR/SR/BSR/C channels.
ADJUSTMENT POINT DIAGRAM
LEFT/RIGHT CHANNEL AMPLIFIER BOARD
SECONDARY / ISC BOARD
Содержание T775
Страница 1: ...NAD SERVICE MANUAL T 775 T 775 Surround Sound Receiver Surround Sound Receiver DRAFT DATE AUGUST 2009 ...
Страница 8: ...8 WIRING DIAGRAM ...
Страница 10: ...10 BLOCK DIAGRAM ...
Страница 21: ...21 DSP BOARD COPPER SIDE ...
Страница 22: ...22 DSP BOARD COMPONENT SIDE ...
Страница 23: ...23 KEY BOARD COMPONENT SIDE KEY BOARD COPPER SIDE ...
Страница 24: ...24 PRE OUT BOARD COPPER SIDE ...
Страница 25: ...25 PRE OUT BOARD COMPONENT SIDE ...
Страница 26: ...26 VOLUME BOARD COPPER SIDE ...
Страница 27: ...27 VOLUME BOARD COMPONENT SIDE ...
Страница 28: ...28 F INPUT BOARD COPPER SIDE F INPUT BOARD COMPONENT SIDE ...
Страница 29: ...29 MAIN BOARD COMPONENT SIDE ...
Страница 30: ...30 TRIGGER BOARD COMPONENT SIDE TRIGGER BOARD COPPER SIDE ...
Страница 31: ...31 COMPONENT BOARD COMPONENT SIDE COMPONENT BOARD COPPER SIDE ...
Страница 32: ...32 VIDEO BOARD COPPER SIDE VIDEO BOARD COMPONENT SIDE ...
Страница 33: ...33 HDMI BOARD COPPER SIDE ...
Страница 34: ...34 HDMI BOARD COMPONENT SIDE ...
Страница 35: ...35 PSU ISC BOARD COMONENT SIDE PSU ISC BOARD COPPER SIDE ...
Страница 36: ...36 CONNECTOR 1 BOARD COMPONENT SIDE CONNECTOR 1 BOARD COPPER SIDE ...
Страница 37: ...37 MCU BOARD COMPONENT SIDE MCU BOARD COPPER SIDE ...
Страница 38: ...38 PSU SECONDARY BOARD COMPONENT SIDE PSU STD BOARD COMPONENT SIDE ...
Страница 39: ...39 CONNECTOR 3 BOARD COMPONENT SIDE CONNECTOR 4 BOARD COMPONENT SIDE SPEAKER BOARD COMPONENT SIDE ...
Страница 40: ...40 CONNECTOR 2 BOARD COMPONENT SIDE ...
Страница 96: ...94 ATMEGA48 20 U2007 AT24C16 U2002 ...
Страница 98: ...96 DSP D708E0001BRFP266 U1001 SST39VF800 U1004 ...
Страница 99: ...97 K4S641632K U1003 74HC251D U1005 ...
Страница 100: ...98 74HCU04D U1018 U1019 SN74LVC245 U1010 U1022 TL5001CD U1011 ...
Страница 101: ...99 SN74HCT245 U1009 SN74LVC257AD U1033 U1035 U1036 ...
Страница 103: ...101 TPS3103 U1021 CS8416 U1002 ...
Страница 104: ...102 BU9450 U1032 PCM1791A U1012 1016 ...
Страница 105: ...103 HDMI XC9572XL U20 CM1213 8 U2 U11 U16 U24 U32 D2308 in Trigger ...
Страница 106: ...104 PCA9517 U5 PCF8574 U10 U201 ...
Страница 107: ...105 PI3B16233 U9 U13 SN74AHCT244 U200 ...
Страница 108: ...106 AD8061 U18 U22 U26 AD8063 U17 U21 U25 U27 U29 U30 ...
Страница 109: ...107 MC141585DW U19 ...
Страница 110: ...108 TMDS341 U15 U23 ...
Страница 111: ...109 ADV7320 U28 ...
Страница 112: ...110 ADV7403 U12 AD9388 U14 ...
Страница 113: ...111 AD9389B U31 LM2575 VR3 VR4 ...
Страница 114: ...112 LM1086 VR200 Power Amp L AS358 U5802 U5401 in AMP R ...
Страница 115: ...113 LM35DT U5803 U5402 in AMP R Composite S Video 74HC4051D U4103 4106 BA7660FS U4101 4102 U4001 in Component ...
Страница 116: ...114 Component 74HC4052D U4002 4003 LC78211 U6009 ...
Страница 117: ...115 Volume TPA6120A2DWP U6008 ...
Страница 118: ...116 R2S15205FP U6001 6002 ...
Страница 119: ...117 Trigger 74HC86D U2303 ST232BDR U2301 TPS2011A U2302 ...
Страница 120: ...EXPLODED VIEW A ...
Страница 121: ...119 EXPLODED VIEW B ...
Страница 126: ...Enlarged in detail on next page 124 ...
Страница 129: ...125 SERVICE MANUAL T 775 Surround Sound Receiver NAD ELECTRONICS LTD LONDON ...