13
AMPLIFIER ADJUSTMENT
Idle Current
1.
Rotate R522 fully clockwise.
2.
Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor).
3.
Turn on the unit.
4.
Adjust R522 for 1mV 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
P501
R522
FR
P502
R545
C
P503
R571
SL
P801
R835
SR
P802
R836
BS
P803
R897
ISC Sensitivity
1.
Connect 8 ohm loading to all channels.
2.
Rotate R881 fully clockwise.
3.
Load all channels at full power using 1kHz sine wave.
4.
At this time, monitor the THD of the SL,SR,BS output. Clipping should occur before full power
achieved.
5.
Rotate R834 counter-clockwise slowly until the THD just below 0.1%.
6.
Repeat step 2-5 for R834 but monitor FL, FR & Center output.
7.
The procedure is finish at this step.
8.
Load all channels at full power using 1kHz sine wave with 4 ohm load.
9.
The clipping power(at THD 0.1%) should less than 85W.
ADJUSTMENT POINT DIAGRAM
R522
R545
R571
P501
P502
P503
P803
P802
P801
R835
R836
R897
R881
FRONT / CENTER AMPLIFIER BOARD
SURROUND AMPLIFIER BOARD
SECONDARY / ISC BOARD
Содержание T753
Страница 2: ...2 SAFETY INFORMATION AH VERSION C VERSION ...
Страница 11: ...11 BLOCK DIAGRAM ...
Страница 14: ...14 PCB LAYOUT AUDIO BOARD POWER SUPPLY STANDBY BOARD ...
Страница 16: ...16 DSP BOARD COPPER SIDE DSP BOARD COMPONENT SIDE ...
Страница 17: ...17 FRONT CENTER AMPLIFIER BOARD COMPONENT SIDE ...
Страница 18: ...18 FRONT CENTER AMPLIFIER BOARD COPPER SIDE ...
Страница 19: ...19 SURROUND AMPLIFIER BOARD COMPONENT SIDE ...
Страница 20: ...20 SURROUND AMPLIFIER BOARD COPPER SIDE ...
Страница 21: ...21 KEY BOARD POWER SWITCH COMPONENT SIDE KEY BOARD POWER SWITCH COPPER SIDE ...
Страница 22: ...22 MAIN BOARD ...
Страница 23: ...23 MULTI CHANNEL BOARD COMPONENT SIDE ...
Страница 24: ...24 MULTI CHANNEL BOARD COPPER SIDE ...
Страница 25: ...25 PRE OUT BOARD COPPER SIDE PRE OUT BOARD COMPONENT SIDE ...
Страница 26: ...26 SPEAKER TERMINAL BOARD POWER SWITCH TRIGGER BOARD VIDEO 6 BOARD ...
Страница 27: ...27 SECONDARY ISC BOARD COMPONENT SIDE SECONDARY ISC BOARD COPPER SIDE ...
Страница 28: ...28 S VIDEO BOARD ...
Страница 29: ...29 COMPOSITE VIDEO BOARD COMPONENT SIDE COMPOSITE VIDEO BOARD COPPER SIDE ...
Страница 37: ...37 SPEAKER A B ...
Страница 53: ...53 LC74763 S VIDEO BOARD U4101 ...
Страница 54: ...54 M61516FP MULTI CHANNEL BOARD U6101 U6102 ...
Страница 80: ...80 SERVICE MANUAL T 753 Phase II Surround Sound Receiver NAD ELECTRONICS LTD LONDON ...