smap4040 电路图.pdf

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1、SERVICE MANUAL AP4040 U.S.A. Yorkville Sound Inc. 4625 Witmer Industrial Estate Niagara Falls, New York 14305 USA Voice: (716) 297-2920 Fax: (716) 297-3689 WORLD HEADQUARTERS CANADA Yorkville Sound 550 Granite Court Pickering, Ontario L1W-3Y8 CANADA Voice: (905) 837-8481 Fax: (905) 837-8746 Quality

2、and Innovation Since 1963 Printed in Canada WEB: MODEL TYPE: YS4040 RadioFans.CN 收音机爱 好者资料库 Manual-Service-ap4040-00-4v2.pdf The exclamation point within an equilatereal triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the lite

3、rature accompanying the appliance. Le point dexclamation lintrieur dun triangle quilatral est prvu pour alerter lutilisateur de la prsence dinstructions importantes dans la littrature accompag- nant lappareil en ce qui concerne lopration et la maintenance de cet appareil. This lightning flash with a

4、rrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Ce symbole dclair avec tte de flche dans un triangle

5、quilatral est prvu pour alerter lutilisateur de la prsence dun voltage dangereux non-isol proximit de lenceinte du produit qui pourrait tre dampleur suffisante pour prsenter un risque de choque lectrique. IMPORTANT SAFETY INSTRUCTIONS safety-4v8 April 14/2011 CAUTION: TO REDUCE THE RISK OF ELECTRIC

6、SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. THIS DEVICE IS FOR INDOOR USE ONLY! FOLLOW ALL INSTRUCTIONSSUIVEZ TOUTES LES INSTRUCTIONS Instructions pertaining to a risk of fire, electric shock, or injury to a person Read Inst

7、ructions: The Owners Manual should be read and understood before operation of your unit. Please, save these instructions for future reference and heed all warnings. Clean only with dry cloth. Packaging: Keep the box and packaging materials, in case the unit needs to be returned for service. Warning:

8、 To reduce the risk or fire or electric shock, do not expose this apparatus to rain or moisture. Do not use this apparatus near water! Warning: When using electric products, basic precautions should always be followed, including the following: Power Sources Your unit should be connected to a power s

9、ource only of the voltage specified in the owners manual or as marked on the unit. This unit has a polarized plug. Do not use with an extension cord or receptacle unless the plug can be fully inserted. Precau- tions should be taken so that the grounding scheme on the unit is not defeated. An apparat

10、us with CLASS I construction shall be connected to a Mains socket outlet with a protective earthing ground. Where the MAINS plug or an appliance coupler is used as the disconnect device, the disconnect device shall remain readily operable. Hazards Do not place this product on an unstable cart, stand

11、, tripod, bracket or table. The product may fall, causing serious personal injury and serious damage to the product. Use only with cart, stand, tripod, bracket, or table recommended by the manufacturer or sold with the product. Follow the manufacturers instructions when installing the product and us

12、e mounting accessories recommended by the manufacturer. Only use attachments/accessories specified by the manufacturer Note: Prolonged use of headphones at a high volume may cause health damage on your ears. The apparatus should not be exposed to dripping or splashing water; no objects filled with l

13、iquids should be placed on the apparatus. Terminals marked with the “lightning bolt” are hazardous live; the external wiring connected to these terminals require installation by an instructed person or the use of ready made leads or cords. Ensure that proper ventilation is provided around the applia

14、nce. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. No naked flame sources, such as lighted candles, should be placed on the apparatus. Power Cord Do not defeat the safety purpose of the polarized or ground

15、ing-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement o

16、f the obsolete outlet. The AC supply cord should be routed so that it is unlikely that it will be damaged. Protect the power cord from being walked on or pinched particularly at plugs. If the AC supply cord is damaged DO NOT OPERATE THE UNIT. To completely disconnect this apparatus from the AC Mains

17、, disconnect the power supply cord plug from the AC receptacle. The mains plug of the power supply cord shall remain readily operable. Unplug this apparatus during lightning storms or when unused for long periods of time. Service The unit should be serviced only by qualified service personnel. Servi

18、cing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. AVIS: AFIN DE REDUIRE

19、LES RISQUE DE CHOC ELECTRIQUE, NENLEVEZ PAS LE COUVERT (OU LE PANNEAU ARRIERE) NE CONTIENT AUCUNE PIECE REPARABLE PAR LUTILISATEUR. CONSULTEZ UN TECHNICIEN QUALIFIE POUR LENTRETIENT CE PRODUIT EST POUR LUSAGE LINTREUR SEULEMENT Instructions relatives au risque de feu, choc lectrique, ou blessures au

20、x personnes Veuillez Lire le Manuel: Il contient des informations qui devraient tres comprises avant lopration de votre appareil. Conservez. Gardez S.V.P. ces instructions pour consultations ultrieures et observez tous les avertissements. Nettoyez seulement avec le tissu sec. Emballage: Conservez la

21、 boite au cas ou lappareil devait tre retourner pour rparation. Avertissement: Pour rduire le risque de feu ou la dcharge lectrique, nexposez pas cet appareil la pluie ou lhumidit. Nutilisez pas cet appareil prs de leau! Attention: Lors de lutilisation de produits lectrique, assurez-vous dadhrer des

22、 prcautions de bases incluant celle qui suivent: Alimentation Lappareil ne doit tre branch qu une source dalimentation correspondant au voltage spcifi dans le manuel ou tel quindiqu sur lappareil. Cet appareil est quip dune prise dalimentation polarise. Ne pas utiliser cet appareil avec un cordon de

23、 raccordement moins quil soit possible dinsrer compltement les trois lames. Des prcautions doivent tres prises afin deviter que le systme de mise la terre de lappareil ne soit dsengag. Un appareil construit selon les normes de CLASS I devrait tre raccord une prise murale dalimentation avec connexion

24、 intacte de mise la masse. Lorsquune prise de branchement ou un coupleur dappareils est utilise comme dispositif de dbranchement, ce dispositif de dbranchement devra demeurer pleinement fonctionnel avec raccordement la masse. Risque Ne pas placer cet appareil sur un chariot, un support, un trpied ou

25、 une table instables. Lappareil pourrait tomber et blesser quelquun ou subir des dommages importants. Utiliser seulement un chariot, un support, un trpied ou une table recommands par le fabricant ou vendus avec le produit. Suivre les instructions du fabricant pour installer lappareil et utiliser les

26、 accessoires recommands par le fabricant. Utilisez seulement les attachements/accessoires indiqus par le fabricant Note: Lutilisation prolonge des couteurs un volume lev peut avoir des consquences nfastes sur la sant sur vos oreilles. . Il convient de ne pas placer sur lappareil de sources de flamme

27、s nues, telles que des bougies allumes. Lappeil ne doit pas tre expos des gouttements deau ou des claboussures et quaucun objet rempli de liquide tel que des vases ne doit tre plac sur lappareil. Assurez que lappareil est fourni de la propre ventilation. Ne procdez pas linstallation prs de source de

28、 chaleur tels que radiateurs, registre de chaleur, fours ou autres appareils (incluant les amplificateurs) qui produisent de la chaleur. Les dispositifs marqus dune symbole “dclair” sont des parties dangereuses au toucher et que les cblages extrieurs connects ces dispositifs de connection extrieure

29、doivent tre effectivs par un oprateur form ou en utilisant des cordons dj prpars. Cordon dAlimentation Ne pas enlever le dispositif de scurit sur la prise polarise ou la prise avec tige de mise la masse du cordon dalimentation. Une prise polarise dispose de deux lames dont une plus large que lautre.

30、 Une prise avec tige de mise la masse dispose de deux lames en plus dune troisime tige qui connecte la masse. La lame plus large ou la tige de mise la masse est prvu pour votre scurit. La prise murale est dsute si elle nest pas conue pour accepter ce type de prise avec dispositif de scurit. Dans ce

31、cas, contactez un lectricien pour faire remplacer la prise murale. vitez dendommager le cordon dalimentation. Protgez le cordon dalimentation. Assurez- vous quon ne marche pas dessus et quon ne le pince pas en particulier aux prises. NUTILISEZ PAS LAPPAREIL si le cordon dalimentation est endommag. P

32、our dbrancher compltement cet appareil de lalimentation CA principale, dconnectez le cordon dalimentation de la prise dalimentation murale. Le cordon dalimentation du bloc dalimentation de lappareil doit demeurer pleinement fonctionnel. Dbranchez cet appareil durant les orages ou si inutilis pendant

33、 de longues priodes. Service Consultez un technicien qualifi pour lentretien de votre appareil. Lentretien est ncessaire quand lappareil a t endommag de quelque faon que se soit. Par exemple si le cordon dalimentation ou la prise du cordon sont endommags, si il y a eu du liquide qui a t renvers lint

34、rieur ou des objets sont tombs dans lappareil, si lappareil a t expos la pluie ou lhumidit, si il ne fonctionne pas normalement, ou a t chapp. S2125A RadioFans.CN 收音机爱 好者资料库 550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305 SERVICE

35、 MANUAL 1 Yorkville Sound 550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305 SERVICE MANUAL 1 Yorkville Sound Y Yo or rk kv vi il ll le e A AP P4 40 04 40 0 P Po ow we er r A Am mp pl li if fi ie er r M M1 11 12 29 9 “ “T TH HE E I

36、IN NP PU UT T B BO OA AR RD D” ” The input board processes the audio signal from the input jacks to the volume control board, (M1128). Each channel consists of a balanced gain stage, switchable subsonic filter, and a stereo / mono / bridge switch. Looking at the left channel, the balanced input, (XL

37、R Jack) and unbalanced input (phone jack) are wired in parallel to the input of a balanced operational amplifier, (U4). The gain of this stage is 0.82 (-1.3dB) balanced and 1.6 (4.0dB) unbalanced. Resistors R25, R27 along with capacitors C11 and C12 form a radio interference elimination filter. Swit

38、ch S1 selects the cutoff frequency of the hi-pass subsonic filter.The subsonic filter provides a 20Hz or 40 Hz high pass filter.The filter consists of a tee network on the input of U3 along with R10, R28, C29 and C30, C33 and C34.The gain is 1 (0dB) in the passband, (above 100Hz). The audio signals

39、from the input board M1129 pass through the 14 conductor cable to board M1128. M M1 11 12 28 8 “ “V VO OL LU UM ME E C CO ON NT TR RO OL L B BO OA AR RD D” ” This board contains: the front panel audio gain controls the front panel indicating LEDs (power, protect, activity and clip). the audio limite

40、rs Circuit Explanation: The left channel of the circuit is explained. (Refer to the schematic of M1128 as the sections of the circuit are explained.) The audio signal out of M1129 passes through volume control P2 and the desired level enters U2 through pin 6. U2 is set for a gain of 5 (14dB) when th

41、e volume control is in the fully clockwise position. The AP4040s defeatable limiter is built around LD8. LD8 is an opto-resistive cell comprising of an LED that shines on a photocell. As the LED in the LD8 becomes brighter, the resistance of the photocell decreases, placing more of the audio signal

42、on pin 5 (non-inverting input) of U2.This audio voltage gets subtracted from the signal on the inverting input and less signal appears on the output of U2.Transistors Q5 and Q6 along with the surrounding passive parts provide the attack and release time constants of the limiting function along with

43、the drive currents for the clip LED and the LED inside LD8. When an audio signal on the output of the power amplifier section (on board M1146) enters clipping, pulses representing the duration of the clipped portion appear at LCLIP.These pulses turn on transistor Q6, and Q6 provides current pulses t

44、o turn on clip LED LD6.The pulses also pass through R7 and D6 to charge C3 and C36. When the voltage across C3 reaches 0.5 volts then Q5 turns on providing a cur- rent into the LED of the LD8 limiting the audio signal at U2.The charging (attack) and discharging (release) times of the limiter are 80m

45、S and 3.5 seconds respectively. Resistors R50 and R7 provide the charging path, and resistor R51 provides the dis- charge path.The limiter can be defeated by placing the limiter switch (S2) in the in position which disconnects Q5 and the charging / discharging circuitry from V+. The activity LED cir

46、cuit consists of Q1 and the surrounding circuitry.The audio sig- nal enters the activity LED circuit through R2. R2 and C21 form a differentiator that turns Q1 on illuminating the activity LED whenever the audio signal increases in ampli- tude. A constant current flows through R55A, R55B and when Q1

47、 is off, the collector current then flows through D1. From M1128 the audio signal passes through a 12-conductor ribbon cable to circuit board M1147. On M1127 an operational amplifier U201 re-references the ground for the audio sig- nal from LREF or RREF to the corresponding LOG (left output ground)

48、or ROG (right output ground). U201 also provides DC correction for DC offsets appearing on the out- put binding posts. Feedback from the output binding posts appears on LFNB or RFNB. Through R203A or R203B the DC offset achieves a gain of -1 from U201.The DC off- set of opposite polarity on the outp

49、ut of U201 will compensate for the DC offset in the amplifier section on M1146 resulting in 0 volts DC on the output binding posts. The audio signal continues to M1146 via an 8-conductor ribbon cable. M M1 11 12 26 6 “ “T TH HE E V VO OL LT TA AG GE E A AM MP PL LI IF FI IE ER R A AN ND D C CU UR RR RE EN NT T A AM MP PL LI IF FI IE ER R” ” This board contains: a voltage amplifier section a current amplifier section amplifier current limit section DC output protection heatsink temperature sensing Voltage Amplifier Section The voltage amplifier