Nad-S-400-Service-Manual(1) 电路图 维修手册.pdf

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1、Preliminar y NANAD D S 400 RDS FM TUNER SERVICE MANUAL SERVICE MANUAL S 400 RDS FM TUNER S 400 RDS FM TUNER NANAD D All rights reserved. No part this publication may be reproduced, stored or transmitted in any form without the written permission of NAD Electronics International 2003 NAD ELECTRONICS

2、INTERNATIONAL ONTARIO, CANADA RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- TURERS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LI

3、ABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN IS

4、OLATION TRANSFORMER FOR PROTEC- TION FROM A.C. LINE SHOCK. SAFETY CHECKS AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF THE FOLLOWING. SUBJECT : FIRE CONNECT A 1500 OHM 10 WATT RESIS- TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH

5、GROUND (WATER PIPE, CON- DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED

6、75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT: GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL T

7、O THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAG- NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN- GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SUB

8、JECT : X-RADIATION 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER- SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN- TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC- TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVE

9、L. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA- TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC- TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR- CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR- ABLE LEVELS. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST

10、BE USED. DEGAUSSING SHIELDS ALSO SERVE AS AN X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALL THEM. 3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA- TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS TH

11、E ONE AVAILABLE AT YOUR DISTRIBUTOR. 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH

12、 VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT YOU AND YOUR SERVICE ORGA- NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU- LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE- DURE AND THAT THE HIGH VOLTAGE READING BE RECORDED ON EACH CUSTOM

13、ERS INVOICE. 5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IT IS NECESSARY TO LOCATE THE CAUSE OF EXCES- SIVE VOLTAGE.

14、 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED). SUBJECT: IMPLOSION 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE- GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AV

15、OID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT. 2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES. SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY- HOLE OR CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2.

16、 AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA- TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC- ORATIVE SCARVES OR OTHER COVERINGS

17、WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER- CIAL MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR

18、 FLOW ACROSS THE BOTTOM. BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A RO

19、LL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ- ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. F

20、OR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS. EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN- GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO H

21、OME AND FAMILY. PRODUCT SAFETY SERVICING GUIDELINES FOR NAD PRODUCTS A.C. VOLTMETER GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC PLACE THIS PROBE ON EACH EXPOSED METAL PART RadioFans.CN 收音机爱 好者资料库 Preliminar y ALIGNMENT PROCEDURE FOR NAD S400: EQUIPMENT REQUIRED FOR ALIGNMENT PROCEDURE: FM

22、 RF signal generator capable of 75MHz to 109MHz output 75 that can separately modulate left and right channels (Panasonic model # VP-7637A or equivalent) DMM with a basic accuracy of better than +/- 0.05%. High impedance (10 M) dual channel audio AC voltmeter with decibel readout with accuracy of be

23、tter than +/- 3%. Dual channel oscilloscope that has greater than 20MHz bandwidth. Non-Ferris tuning tools. ALIGNMENT PROCEDURE: WARNING: MOST OF THE ALIGNMENT POINTS AND ADJUSTMENTS ARE FOUND UNDER A SEALED BY SOLDER SHIELD. NORMALLY THERE SHOULD NOT BE A REASON FOR ACCESS TO THE ALIGNMENT POINTS A

24、ND ADJUSTMENTS, UNLESS PARTS HAVE BEEN REPLACED. ONLY ATTEMPT ALIGNMENT IF ALL EQUIPMENT MENTIONED ABOVE IS AVAILABLE AND ONLY IF QUALIFIED PERSONNEL PERFORM THE ALIGNMENT. Depending on the country, the S400 can be setup differently via the front panel buttons. Hold down the MODE button while switch

25、ing on the power. You now see a start up menu, where you can toggle between the various menu options with the DISPLAY button and save the choice with the STORE button. For continental US select: BAND = EU-USA (87.500 MHz to 108.500 MHz) EQ = 75us AUTO STEP = 100kHz, DELETE PRESETS? = (DISPLAY button

26、 = yes, STORE button = no)? For Europe select: BAND = EU-USA (87.500 MHz to 108.500 MHz) EQ = 50us AUTO STEP = 50kHz, DELETE PRESETS? = (DISPLAY button = yes, STORE button = no)? For Japan select: BAND = JAPAN (75.500 MHz to 90.500 MHz) EQ = 75us AUTO STEP = 100kHz, DELETE PRESETS? = (DISPLAY button

27、 = yes, STORE button = no)? Alignment of RF front-end: 1) Press the IF-button to select IF NARROW. Press the ANTENNA-button and select ANTENNA 2. Then connect an RF signal generator to ANTENNA port #2 and set to: Amplitude = 45 dBu Pilot tone = off Modulation = off Frequency = 98.000 MHz. NAD S400 P

28、reliminar y 2) Tune the S400 to 108.500 MHz (90.500 MHz for Japan). Looking at the S400 from the front, measure with a DMM at the right hand side of R21 found at position “R6” on the board. Adjust L13 until the tuning voltage is 10.0V DC. 3) Tune the S400 to 98,000 MHz (83.00 MHz for Japan). Measure

29、 with an oscilloscope, the IF-signal 10.7 MHz at the common point between CF3 and CF4 found at position “O4” (see Figure 1). This point will be “DC voltage free”. Leave the oscilloscope set to this point until told to remove it. In the order listed below: Adjust L10 until the IF-signal for maximum s

30、etting. Adjust L7 until the IF-signal for maximum setting. Adjust L1 until the IF-signal for maximum setting. Readjust L10, L7 and L1 until there is no more improvement for the maximum settings. IF Measurement Point CF4CF2 CF3 Figure 1 L1 L2 L10 L12 L7 VR1 L13 IC1 R21 Unsolder Clip Unsolder Clip Fig

31、ure 2 NAD S400 Preliminar y 4) With the same oscilloscope setup as in procedure #3, press the ANTENNA button and select ANTENNA port #1. Check that the IF-signal is reduced by a minimum of 40 dB. 5) Connect the signal generator to ANTENNA port #1. With the same oscilloscope setup as in procedure #3,

32、 adjust L2 until the IF-signal is at maximum setting. Press the ANTENNA button and select ANTENNA port #2. Check that the IF-signal is reduced by a minimum of 40 dB. NOTE: Return to step #3 and perform the same alignment procedure but substitute L2 for L1. Continue to align L10, L7, L2, and L1, unti

33、l there is no improvement in IF-level maximum level between the two antenna ports, and that the isolation between the two ports is greater that 40 dB. Alignment of IF Section: 6) Connect an RF signal generator to ANTENNA port #1 and set to: Amplitude = 45 dBu Pilot tone = off Modulation = off Freque

34、ncy = 98.000 MHz. Press the ANTENNA-button and select ANTENNA port #1. Press the IF-button to select IF WIDE. With the same oscilloscope setup as in procedure #3, check that the IF-signal had increased approximately 3 dB compared to IF NARROW. Remove the oscilloscope probe from the common point betw

35、een CF3 and CF4. 7) Connect an RF signal generator to ANTENNA port #1 and set to: Amplitude = 70 dBu Pilot tone = off Modulation = off Frequency = 98.000 MHz. Adjust L13 (or VR1) until the centre-tune LED turns on. Fine adjust VR1 so that it lights from approximately 97,965 MHz. to 98,035 MHz equall

36、y. Alignment of Audio Section: 8) Set the S400 as the following: Press the IF-button to select IF WIDE. Press the ANTENNA-button and select ANTENNA 1. Press the MONO/MUTE-button to MUTE OFF MONO. Press the BLEND-button to BLEND OFF. Press the BANDWIDTH-button to BANDWIDTH WIDE. Tune the S400 to 98.0

37、0 MHz. 9) Connect an audio AC voltmeter with decibel display to both the right and left audio output jacks. Set the AC-voltmeter to negative 30 dB range. Leave the audio AC-voltmeter attached to the S400 audio output jacks until told to remove it. Then connect an RF signal generator to ANTENNA port

38、#1 and set to: Amplitude = 45 dBu Pilot tone = on (19 kHz 10%) Modulation = off Frequency = 98,00 MHz 10) Adjust L3 for a minimum 19 kHz output at the right audio jack. 11) Adjust L4 for a minimum 19 kHz output at the left audio jack NAD S400 Preliminar y 12) With the audio AC-voltmeter connected as

39、 in procedure #9, select 0 db range for both channels. Connect an RF signal generator to ANTENNA port #1 and set to: Amplitude = 65 dBu Pilot tone = on (19 kHz 10%) Modulation = 100% (including pilot tone) 1kHz +/- 75 kHz L+R and L-R. Frequency = 98,000 MHz. 13) Set the S400 as the following: Press

40、the IF-button to select IF WIDE. Press the ANTENNA-button and select ANTENNA 1. Press the MONO/MUTE-button to MUTE ON STEREO. Press the BLEND-button to BLEND OFF. Press the BANDWIDTH-button to BANDWIDTH WIDE. Tune the S400 to 98.00 MHz. 14) Check that the audio output is approximately 0 dB +/- 1 dB

41、(775 mV rms) in both right and left output jacks. 1. Turn the variable capacitor C37 so that the capacitor fins do not mesh, then switch off the modulation in the right side of the RF signal generator. Adjust L12 until minimum audio output is measured in the right side. Record this minimum output le

42、vel. 2. Switch on the modulation in the right side of the RF signal generator. Switch off the modulation in the left side of the RF signal generator. Adjust L12 until minimum audio output is measured in the left side. Record this minimum output level. Use the side with the worst channel separation t

43、o adjust L12, by repeating the above two steps. After adjusting L12 adjust C37 to minimum output level (maximum channel separation). Channel separation should be 45 dB (+/- 5 dB). 15) Press the IF-button to select IF NARROW. Check that the channel separation drops approximately 10 dB (+/- 5dB) at th

44、e audio output jacks. 16) Press the BLEND-button to select BLEND ON. Check that the channel separation drops to approximately 15 dB. (+/- 3 dB) at the audio output jacks. Remove the audio AC-voltmeter from the audio output jacks, as well as the RF signal generator form the antenna port. 17) Set the

45、S400 to default settings for the tuner as the following: Press the IF-button to select IF WIDE. Press the ANTENNA-button and select ANTENNA 1. Press the MONO/MUTE-button to MUTE ON STEREO. Press the BLEND-button to BLEND OFF. Press the BANDWIDTH-button to BANDWIDTH WIDE. After 10 sec. the settings w

46、ill be stored. NAD S400 Preliminar y L1 L2 L10 L12 L7 VR1 L13 IC1 R21 Unsolder Clip Unsolder Clip CF4CF2 CF3 L14 C37 L3L4 RIGHT LEFT ANTENNA 2ANTENNA 1 NAD S400 Preliminar y NAD S400 Preliminar y NAD S400 Preliminar y NAD S400 Preliminar y NAD S400 Preliminar y NAD S400 Preliminar y NAD S400 NAD S40

47、0 MAINBOARD NAD S400 MAIN BOARD NAD S400 POWER BOARD NAD S400 POWER BOARD NAD S400 SUB DISPLAY BOARD NAD S400 SUB DISPLAY BOARD NAD S400 MAIN DISPLAY BOARD NAD S400 MAIN DISPLAY BOARD Preliminar y ELECTRICAL PARTSLIST MOTHERBOARD VALUEDESIGNATORFOOTPRINTMANUFACT P.N.MANUFACTURERCOOR XCOOR Y 100ER101

48、206 SMDMCR18F1000ROHM63904160 100ER1001206 SMDMCR18F1000ROHM62454195 100ER281206 SMDMCR18F1000ROHM66252340 100ER751206 SMDMCR18F1000ROHM46504025 100ER771206 SMDMCR18F1000ROHM39504025 100ER871206 SMDMCR18F1000ROHM36001045 100ER951206 SMDMCR18F1000ROHM3600955 100KR351206 SMDRC06A104JTYAGEO59004000 100

49、KR401206 SMDRC06A104JTYAGEO50002100 100KR411206 SMDRC06A104JTYAGEO49002100 100KR461206 SMDRC06A104JTYAGEO46762280 100KR531206 SMDRC06A104JTYAGEO44261970 100KR61206 SMDRC06A104JTYAGEO67904095 100KR611206 SMDRC06A104JTYAGEO39251250 100KR631206 SMDRC06A104JTYAGEO34351000 100KR661206 SMDRC06A104JTYAGEO36153350 100KR741206 SMDRC06A104JTYAGEO43153350 100NC1051206 SMDMCH315C104KROHM7050550 100NC1071206 SMDMCH315C104KROHM72001050 100NC1201206