Hitachi HA-7700 Service Manual Download Page 1 | Manualshive

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Summary of Contents for HA-7700

Page 1: ...B Speakers A network Rated Power 115 dB Damprng Factor 1 kHz 8 ohms 1 2 rated output 60 Channel Separation 1 kHz 8 ohms Speaker Impedance Phones Impedance 75 dB 4 7 kohms short 4 ohms 16 ohms More than 4 ohms English Deutsch Francrais PREAMPLIFIER SECTION Input Sensitivity Impedance Phono 1 2 Tuner AUX Tape Play 1 2 Phono overload 1 kHz 0 01 THD Phono 1 2 Output Level Impedance Pre 0ut Tape REC ou...

Page 2: ...ewahlt durch ruckwartigen eingebauten Schalter A oder B Lauts precher 115 dB 60 75 d8 4 7 kOhm kurz 4 16 Ohm Mehr als 4 Ohm MM 2 5 mV 100 Ohm 22 kOhm 47k0hm 100 kOhml MC 250µV 1000hm Muting GENERAL Dimensions W x H x Dl Weight Power consumption Power requirements 435 x 164 5 x 383 mm 17 1 3 x 6 1 2 x 15 16 kg 35 lbs 400 VA 330W at 1 3 rated output 460W at rated output AC 120 V 60 Hz 1 20 v 220 v 2...

Page 3: ...1 2 Surcharge phone 1 kHz 0 01 DHT Phono 1 2 lmpedance niveau de sortie Pre sortie MC 250µV 100 ohms 150 mV 47 kohms 150 mV 47 kohms Lecture de bande 2 DIN 150 mV 147 kohms Sauf pour USA et Canada J MM 300 mV MC 30 mV 1 V 600 ohms 3 Sortie d enregistrement REC de bande 1 2 Niveaux maximum de sortie 0 01 DHT Pre sortie Reponse en frequence Phono Tuner AUX Rapport signal bruit IHF court circuite res...

Page 4: ...istung von 15 Watt Dauerton pro K inal an 8 Ohm 20 Hz 20 kHz und einem Gesamtklirrfaktor von weniger als 0 02 erre1cht Gleichstrom Verstiirker ermi iglicht genaue Obertragung der Wellenform Dieses Medell wird durch eine durchgehende 4 MC head amplifier and equalizer amplifier for improved S N ratio This model contains an MC head amplifier which allows moving coil MC cartridges to be con nected dir...

Page 5: ...l ioree dans le doma Ine des hautes frequences et ceci concourt a staoili ser la reponse toute ent1ere depuis le doma1ne des hautes frequences 1usqu a celu1 des oasses 5 oo HITACHI HA 7700 5 PHONO Wahlschalter Plattenspieler ausgerustet mit MC moving coil bewegte Spule oder MM moving mag net bewegter Magnet Tonabnehmersystem konnen entweder an die PHON0 1 oder PHO NO 2 Plattenspieler Eingangsklemm...

Page 6: ... des plaquettes acircuit imprime Power supply P W B Stromquelle P W B Alimentation P W B Chemical condenser P W B Chemische Kondensatoren P W B Condensateur chimique P W B Volume switch P W B Lautstarkeregler P W B Commande de volume P W B Tone amp P W 8 Ton verstarker P W B Ampli de son P W B A f ii 2j i J x6 6 The numbers in the circle marks in the diagram correspond to those in the repJacement ...

Page 7: ...d wire may be open and noise becomes mixed in this case so be sure to discharge between the 8 and 3 terminals of the electrolytic capacitor 2 Do not touch the terminals of nearby parts with a DC voltmeter when connecting it for adjusting the idle current as malfunction may result Handle the DC voltmeter carefully Wind insulating tape around the screwdriver Caution when replacing electrolytic capac...

Page 8: ...n stability deteriorates by this so the FET is isolated from the chassis using a resistor of 12 ohms Accordingly be careful not to cause an output by touch ing the e lead wire of the speaker to the chassis or dis charge the electrolytic capacitor during servicing since this may cut the lead wire of R737 and introduce noise Precautions on troubleshooting and replacing parts 1 When the stabilized po...

Page 9: ...KING THE OPERATION OF THE PROTECTION CIRCUIT When the output circuit is repaired by replacing the power transistors etc perform an operation check on the ASO Area of Safe Operation detection circuit and the speaker protection circuit 1 Operation check of the ASO detection circuit for the output transistors Connect the audio oscillator to the MAIN IN terminals with the speaker terminals unloaded sp...

Page 10: ...it I i Phenomenon when the Cause protection circuit operates No sound comes out about 4 7 sec after the power switch is turned ON 1 No sound comes out Short circuit of 2 When the power switch speaker output is turned ON the relay terminal becomes ON then OFF when the ignal is applied 1 No sound comes out DC leakage of control 2 Neutral pc int voltage is amp power amplifier more than 2V faulty etc ...

Page 11: ...ect coupling Condenser coupling sw Power sw AC 120 V 60 Hz Muting sw A Speaker B Speaker i Jf 0Headphone jack Protection circuit 120 V 220 V 240 V 50 60 Hz 1 UNSWITCHED U 100W MAX SWITCHED for U S A Canada sets only TOTAL 100W MAX for U S A Canada sets only PRIMARY CIRCUIT DIAGRAM FOR ASIA LATIN AMERICAN COUNTRIE 120V 220V 240V F1 Fz T2 5A 250V Tl 25A 250V Sia I ____ F1 COOi 0 01µ450V C002 0 01µ45...

Page 12: ... UNSWITCHED 100WMAX SWITCHED for U S A Canada sets only TOTAL 100 W MAX for U S A Canada sets only IT DIAGRAM FOR ASIA LATIN AMERICAN COUNTRIES F1 F2 2 5A 250V l 25A 250V Sia I F2 _____ F1 COOi 0 01µ450V I I POWER SW I I I play board 7 I OFF POSITION VOLTAGE SELECTOR OFF _ 120V OFF 120 Second stage First stage V IOFF position V OFF 120V OFF 120 11 T2 s e 1 120V 1 Yellow I dI I I I I I L J POWER TR...

Page 13: ...les instructions ATTENTION de la page 14 pour effectuer son remplacement GtMl I Blue For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cheny Tree Rd Chinnor OxonOX94QY Tel 01844 351694 Fax 01844 3525M Email enquiries mauritron co uk 12 0 1r 5 i ti if 0 The terminal No shows the stamp on the printed wiring board This number matches the number in the circuit diagram Die Anschlussklemmen sin...

Page 14: ...anuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon0X94QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk TONE PW B PRE AMP P W 8 v v C0 7v v v i f wn r _ __ _ 5102 MOO SW B B Earth Other BASS The turninal No sh board This numbo diagram I I ...

Page 15: ...ws the stamp on the printed wiring board This number matches the number in the circuit diagram FUNCTION SW 5401 Die Anschlussklemmen sind auf der f numeriert Die Nummern stimmen rr Schaltpl n uberein POWER SUPPLY P W 8 I PRE AMP P I HAl2002 ZSK68A ZSKl33 ZS9716 2SJ48 2SCl775 250756 13 ...

Page 16: ...e borne correspond i l indic1tion de la pl1 circuit imprim9 Ca num9ro correspond au nun scti4m1 de montave EQUALIZER P W 8 PRE AMP PW 8 1 P T T2l El Ora e LJ A 4 T T2J POWER SUPPLY P W 8 PRE AMP P W 8 J I I t I 8_2 gz ASO VO 6 I 1 2SKl33 I gm 258716 zs Kl38 izsc1345 I r m 1 T i 2SC2389 2SA672 254755 I f 7 ER815 0I 15581 S4V820 ESA HAl2002 2SK68A I 2SJ48 2SCl775 250756 I 2SCl419 H 12 I 1 Hl 9 I i l...

Page 17: ...nten haben wichtige Sicherheitsaufgaben NOTICE DE SECURITE DE FABRICATION Les composants qui sont accompagntis du symbole possedent des caracteristiques speciales For Service Manuals Contact MAURITRON TECHNICAL RVICES 8 Cherry Tree Rd Chmnor Oxon OX94QY Tel o1844 351694 Fax o Email enquiries maurilrOn OO I 0 I R86J 60 RW5K i1 i _ x_i i _ _ s o_m e a s L_c_h cr _ rG22 i i R OR L_ __ 0 C A 2 49 CllO...

Page 18: ...d to improve safety to prr suro to use the designated type Alwoys use the designated fus ZUR BEACHTUNG Schmelzwidentiinde sind Z1 r Erhohun Bei Aumusch bitte nur die vorgeschriebene Type benutzen ATTENTION Les resistance afusible sont f aitn pour amtlior mplacer utiliser le m m type Utiliser toujoun lo modele d 1 i SOURCEll 2 Pt AY 2 1C 2 2 1 Zt I PLAY I t SO RCE l 2 l IJ SCJl fiCE S6 1a t1 L OW F...

Page 19: ...ppareil protection do circuitl Pour lei rompl r utiliMr le mfmo type Utilinr to jours lo modile do fusible specifia pour offectuor le remplocernont i SOURCEll1 2 z PLAY ll Z 2 1 ZD I P AY 1 t SOURCEll Z 1 11 J SOLRCE SS Sla 11 lJJ N FILTER W TREBLE i Lj_ Same as Leh L ________ GK HITACHI HA 7700 00 b c AY IH Q I I Ii 14 Same as Leh G I 61R The circuit diagram is subject to change for improvement w...

Page 20: ...11 bapnmia d Upteur Abb 5 Fig 5 Deutsch Einbau der Teile Bei der Montage des Geriites wurde besonderes Augen merk auf Betriebssicherheit gelegt so dal alle Teile besonders sorgfoltig eingebaut wurden Zurn Beispiel wurden bestimmte Leiter mit Kunststoffschlauchen ilber zogen oder andere in sicherem Abstand von der Schall platine angeordnet Seim Austauschen bzw Reparieren von Teilen ist daher darauf...

Page 21: ...ter Schalter auf Position CONDENSER COUPLING stellen den Lautsprecher 17 HITACHI HA 7700 l entree et la sortie acourant continu peut se trouver decale ii convient done de controler la tension de I entree et de la sortie acourant continu 2 Etant donne que la classe de hf E est specialement classfiee en a pour Q701 et Q702 Jes remplac er en equilibrant la classe qui correspond achaque canal 3 Etant ...

Page 22: ...en konnte regler le selecteur d enceintes sur la position ON et effectuer le reglage sans appliquer la charge Effectuer le reglage avec R709L ou R709R apres avoir branche le voltmetre a courant continu aux homes positive Eij et negative e des canaux gauche et droit d enceinte pour obtenir une lecture egale a zero avec une tolerance de 0 5 mV dans une marge de 100 mV Fig 9 Abb 9 Fig 9 Reglage de so...

Page 23: ... LllOl ni pl I itern t1r ri11etll l l op o Abb 11 Fig 11 19 HITACHI HA 7700 CONTROLE DE FONCTIONNEMENT DU CIRCUIT DE PROTECTION Quand le circuit de sortie est repare ala suite du remplace ment des transistors de puissance etc effectuer une verifi cation de fonctionnement du circuit de detection de type ASO et du circuit de protection de haut parleur 1 Controle de fonctionnement du circuit de detec...

Page 24: ...zschalter abschalten aut Schutzschiiltung 2 Nachdem der Netzschalter Lautsprecherklemmen I KurzschluS an den Lautsprecher Schutzschaltung ASO eingeschaltet w Jrde spricht klemmen achten und diesenggf das Relais an es wird wieder I beheben danach wieder einschalten I angeschaltet sobald ein Signal I eingegeben wird i Circuit de protection du I Aucum son n est obtenu Court circuit des bornes Mettre ...

Page 25: ... R 0279215 Mylar film 0 22µF 10 250V C601L R 0248718 Ceramic discal 56pF 10 50V C726L R 0248724 Ceramic discal lOOpF 10 sov C602L R 0248702 Ceramic discal 12pF 10 50V C727L R 0248724 Ceramic discal lOOpF 10 50V C603L R 1274011 Mylar film lOOOpF 10 50V C604L R 0248716 Ceramic discal 47pF 10 50V C871L R 0279241 Mylar film O OlµF 10 630V C605L R 1275014 Mylar film 0 033µF 10 50V C607L R 1276013 Mylar...

Page 26: ... Carbon film lki1 5 SRDl 4P Carbon film 390n 5 SRDl 4P R702L R 0114297 Carbon film 470ki1 5 SRDl 4P Carbon film 33 n 5 SRD1 4P Carbon film 680 n 5 SRDl 4P R704L R 0114179 Carbon film 5 6kn 5 SRD1 4P Carbon film l80n 5 SRDl 4P Carbon film 3 9ki1 5 SRDl 4P R706L R 0114201 Carbon film lOkn 5 SRDl 4P Carbon film 47n 5 SRDl 4P R707L R 0114217 Carbon film 47kn 5 SRD1 4P Carbon film 47n 5 SRDl 4P R708L R...

Page 27: ...LR 2227302 t µH oil Q708L R 2328862 2SB716 Q709L R 2328862 2SB716 LSOlL R 2227302 l1µH oil Q710L R 2328872 2SD756 L502L R 2227302 l uH oil Q7 l l L R 2328862 2SB716 Q712L R 2328783 2SC2389 for MAIN 11NTED WIRING BOARD Q713 2328773 2SA1038 L701L R 2227361 udi 1 trap coil DIODES MISCELLANEOUS for PRE AMPLIFIER PRINTED WIRING BOARD 2507133 rt 11nplifier P W B ass y D402L R 2337011 1S2076 t ir U S A C...

Page 28: ...screwlfp 3 p x 8DT bind scn w ij I 4 p t1anged nut for REAR PLATE ASSEMBLY 4090092 2687801 4567432 4784106 4568832 Ground screw Speaker terminal 3 p x 8DT bind screw 3 p x 10 bind tapping screw 3 3 x 8DT screw for AC socket fixing for U S A Canada 24 SYMBOL STOCK DESCRIPTION NO NO 0 u u c E E c i c a a J a a u j c c i u i Cll Cll 3913001 Bushing for AC line cord 0 0 3715183 Bushing for AC line cor...

Page 29: ...ENUATOR Schalter flir Hinterbandkontrolle TAPE MONITOR Funktionsschalter FUNCTION 1 Phono Wahlschalter PHONO SELECTOR Bemebsartenschalter MODE U Klangregelschaiter TONE j Hohenregler TREBLE 1JBASS Regler i Lautsprecherschalter SPEAKERS _ Ktappdeckel 25 CD lnterrupteur secteur POWER Voyant d alimentation Casque stereophonique PHONES Commutateur de sourdine MUTING Commutateur de filtre bas LOW FILTE...

Page 30: ...ngsklemmen 1 PHON0 1 Netzkabel Wechselstromausgangs S teckdose eingeschaltet insges 100 Watt max Nur fUr USA und Kanada Geriitel Wechselstro ausgangs Steekdose ausgeschaltet 100 Watt max Nur fUr USA und Kanada Geriite DIN Normbuchse TAPE 2 DIN REC PLAY Auf5er fur USA und Kanada Gerate Netzspannungswiihler VOLTAGE SELECTORS Fur Asien und Sudamerika Gerate Commutateur de couplage direct couplage cap...

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