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NAD T973
Service Manual

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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of NAD T973 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 2 (click to view)
A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be controlled within 0+/-3mV. If itâs found to be out of this range, change the TL084BCD to get it meet the requirement. B. IDLING CURRENT The idling current at the final stage of the unit should be set to about 40mA+/-10mA. Adjust RV102 (As marked as âIdling Current ADJâ in the enclosed drawing below) to control the voltage between Idling current Test point 1 and 2 to be 8mV +/- 2mV. Preheat the unit for 10 to 15 minutes, and then readjust to 8mV +/- 2mV. (Please note: The idling current must be adjusted when all modules are assembled into the unit.) C. ISC SENSITIVITY Adjust Pot RV104 (as marked as âISC SENS ADJâ in the below drawing) to get the voltage across âISC SENS TEST POINTâ and AGND to be 0mV+/-10mV. (Please note that the ISC should be adjusted when all modules are assembled into the unit. Itâs not possible to get 0V +/-10mV if the modules are not assembled. D. THERMAL SENSE ADJUSTMENT The adjustment should be always done when the T973 is cool condition. (That means the temperature inside the unit should be almost same as the ambient temperature. Connector P208B that connects the transformer and power board should be removed to avoid that the Idling current to heat up the unit excessively) At ambient temperature of 25 C degree and when the unit is just turned on (still in cool condition), adjust the pot RV103 (as marked as âTHERMAL SENS ADJâ in the below drawing) to get voltage across the THERMAL TEST POINT and AGND to be 750mV +/-10mV. While the ambient temperature is different, the voltage will vary as well. There is a relation between the temperature and voltage, that is; if the ambient temperature is 20 degree C, the voltage should be 850mV+/-10mV; if the ambient temperature is 30 degree C, the voltage should be adjusted to 650mV+/-10mV, etc. E. Fan Cut Off Point Adjustment Note: This Fan cut off function does not appear on PCB V10.0, V11.0 or MKII version but only appeared on PCB V12.0. Run the unit for all 7 channels at 1 kHz, 4ohms load, and 250mW output. Do this adjustment when the unit heats up, for example; run the unit at all 7 channels at 50W/4ohms for 10 minutes. Then adjust Pot RV201 on power supply board so the voltage at Pin14 of IC203 just changes from negative to positive (to get the fans just start turning). Then turn off the input signal and monitor if fans will stop within 30 seconds, then turn on the input signal again to see if the fans start turning immediately.

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Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
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