NAD-T955-pwr-sm维修电路原理图.pdf
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1、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? RadioFans.CN 收音机爱 好者资料库 CONTENTS FRONT PANEL/REAR PANELVIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?3 SPECIFICATIONS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
2、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 4 ALIGNMENT PROCEDURE/ALIGNMENT POINTS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?5 WIRING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?6 SCHEMATIC DIAGRAM?
3、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?7-12 PCB LAYOUT? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 13-19 ELECTRICALPARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
4、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?20-33 EXPLODED VIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 34-36 EXPLODED VIEW PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
5、 ? ? ? ? ? ? ? ? ? ? ?37 PACKING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?38 SERVICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE
6、. REFERENCE NO.PART NUMBERDESCRIPTION Rear Panel AH20-12153-10MDAT15AL/250V C20-12702-20MDAT7AL/250V POWER SUPPLY Board F201-F22020-12632-00T6.3AL/250V NOTE: *AH : North American version only *C: European version only 2. Safety-check out (North American model only) Before returning the product to th
7、e customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbolare critical with regard to the risk of fire and electric shock.Replace only parts recommended by the manufacturer. - 2 - RadioFan
8、s.CN 收音机爱 好者资料库 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? - 3 - RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS CONTINUOUS AVERAGE POWER100 W (20.0 dBW)
9、OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz 20 kHz, both channels driven, with no more than rated distortion) Rated Distortion0.03% (THD 20 Hz 20 kHz) Clipping power130 W (maximum continuous power per channel). IHF dynamic power (Maximum short term power per channel) 8 ohms:150 W (22
10、 dBW) 4 ohms:250 W (24 dBW) 2 ohms:330 W (25.2 dBW) Damping factor250 (ref. 8 ohms 50Hz) Input ImpedanceR = 20K C = 380 pF Input sensitivity (for rated output into 8 ohms)1000mV+/-50mV Voltage gain29 dB Frequency response 20 Hz 20 kHz0.2 dB - 3dB at 3 Hz/70 kHz Signal / Noise ratio, A-weighted102 dB
11、 ref. 1 W Dimensions and Weights Net Weight21.8 kg (48.0 Ib) Shipping Weight25 kg (55.1 Ib) Dimension (WHD)435 155 387mm - 4 - RadioFans.CN 收音机爱 好者资料库 ALIGNMENT PROCEDURE A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-20mV. B. IDLING CURRENT The idling curre
12、nt in the output stage of the poweramp should be set to 25mA+/-5mA per pnp-npn transistor pair( This means the mid point voltage is 4mV with down limit of 3mV and up limit of 5mV). The alignment procedure is: At first, adjust RV103 (Marked as “Idling Current ADJ” in the drawing below) for a voltage
13、of 4mV +/- 1mV between Test point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled and then readjust to 4mV +/- 1mV. Pls note:Though the idling current is set as 4mV +/-1mV during the adjustment, due to the influence of varied ambient temperature and mains voltage etc., the i
14、dling current will drift after some time. During the normal checking of idling current in the service field, its acceptable as long as the voltage is in the range of 3mV5mV. C. ISC SENSITIVITY The ISC sensing voltage can allow 0mV+/-50mV. But, for the alignment process in our factory, we tighten the
15、 limit to 0mV+/-10mV. That is to adjust Pot RV104 (as marked as “ISC SENS ADJ” in the below drawing) to get a voltage between the “ISC SENSE TEST POINT” and AGND to be 0mV+/-10mV. - 5 - RadioFans.CN 收音机爱 好者资料库 VSS1 AGND1 AGND1 VPP1 ISC1 VSS1 AGND1 AGND1 VPP1 ACOFF1 DGND SC LED1 ISC1 VSS2 AGND2 AGND2
16、 VPP2 ACOFF2 DGND SC LED2 ISC2 VSS3 AGND3 AGND3 VPP3 ACOFF3 DGND SC LED3 ISC3 VSS4 AGND4 AGND4 VPP4 ACOFF4 DGND SC LED4 ISC4 VSS5 AGND5 AGND5 VPP5 ACOFF5 DGND SC LED5 ISC5 DGND STBY +5.5V SC +5.5V THERMAL AC1 AC2AC2 RELAY LED3 DGND LED2 SC +5.5V STBYLED LED1 LED5 LED4 ACOFF1 DGND SC LED1 VSS1 AGND1
17、AGND1 VPP1 ISC1 ACOFF1 DGND SC LED1 VSS1 AGND1 AGND1 VPP1 ISC1 ACOFF1 DGND SC LED1 VSS1 AGND1 AGND1 VPP1 ISC1 ACOFF1 DGND SC LED1 VSS1 AGND1 AGND1 VPP1 ISC1 ACOFF1 DGND SC LED1 STBY DGND +5VD SC LED3 DGND LED2 SC +5VD STBYLED LED1 LED5 LED4 POWERAMP BOARD POWER SUPPLY BOARD POWERAMP BOARD POWERAMP B
18、OARD POWERAMP BOARD POWERAMP BOARD STANDBY BOARD POWER LED BOARD FROM P3021A FROM AC INLETFROM FUSE FROM P202BTO CH1 P101A TO CH2 P101A TO CH3 P101A TO CH4 P101A TO CH5 P101A FROM P204B FROM P206B FROM P208B FROM P210B FROM TRANSFORMERFROM TRANSFORMERFROM TRANSFORMERFROM TRANSFORMER FROM TRANSFORMER
19、 CH1CH2CH3CH4CH5 FROM TRANSFORMER TO P504B FROM P212A TRIGGER BOARD FROM P302 FROM P302A TO P211B TO P701B DISPLAY BOARD P501BP501B 1 2 P207BP207B 1 2 4 5 3 P209BP209B 1 2 4 5 3 P101AP101A 1 2 3 4 5 6 7 8 9 P208BP208B 1 2 3 4 5 6 7 8 9 P205BP205B 1 2 4 5 3 P504BP504B 1 2 3 4 5 P213BP213B 1 2 3 4 P10
20、1AP101A 1 2 3 4 5 6 7 8 9 P302AP302A 2 3 4 1 5 6 7 8 9 P506BP506B 1 2 3 4 P701BP701B 1 2 3 P101AP101A 1 2 3 4 5 6 7 8 9 P203BP203B 1 2 4 5 3 C GR P502BP502B 1 2 P211BP211B 1 2 3 4 5 6 7 8 9 P204BP204B 1 2 3 4 5 6 7 8 9 P101AP101A 1 2 3 4 5 6 7 8 9 P505BP505B 1 2 P212AP212A 2 3 4 1 5 P101AP101A 1 2 3
21、 4 5 6 7 8 9 P201BP201B 1 2 4 5 3 P301AP301A 2 3 1 P401AP401A 2 3 4 1 P210BP210B 1 2 3 4 5 6 7 8 9 P202BP202B 1 2 3 4 5 6 7 8 9 P206BP206B 1 2 3 4 5 6 7 8 9 - 6 - WIRING DIAGRAMRadioFans.CN 收音机爱 好者资料库 AGND LED SC ISC VSS OFFSET AGND AGND TP3 OFFSET TP2 TP1 ACOFF DGND VPP TP3 TH2 AGND EGND TP1 TP2 -1
22、5VA AGND +15VA TH1 TH2 TH1 -15VA +15VA -15VA VCC +15VA VSS +15VA +15VA VCC VSS -15VA +15VA -15VA -15VA TO CONNECTION BOARD /1/4W /1KV /2W /2W /2W /1W /1KV /1KV /1KV /25V /25V /1W /1W /1W /1W /1/4W /1/4W /1/4W /1/4W /1/4W /1/4W /100V /1/4W /1/4W /80V /80V /1/2W /1/2W /1/4W /1/2W /1KV /1/2W /1/4W /1/4
23、W /1KV /25V /25V /63V /1KV /25V /1/2W /1% /1% /25V /63V /1/2W /1/2W /1KV /3W /1/2W /1/2W /1% /1% /1% /1% /1% /1% All Polyester capacitors are 63V 5% unless noted. All Elec. capacitors are 50V 20% unless noted. All Resistor are 1/6W 5% RJ13 unless noted. Idling current setting: Adjust RV103 let volta
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- NAD T955 pwr sm 维修 电路 原理图