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SAFETY PRECAUTION The following precautions should be observed when servicing. I. Since many parts in the unit have special safely related characteristics, always use genuine Hitachi's replacement parts. Especially critical parts in the power circuit block should not be replaced...
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20 Hz — 20 kHz. RIAA 20.5 dB (HA-57) PHONO 435(W) X IIO(H) X 280(D) (HA-57) 30 Hz — 20 kHz, RIAA 20.5dB (HA-37) Dimensions CD, TUNER, 435(W) X 110(H) X 280(D) mm (HA-37) TAPE 10 Hz—40 7.6 kg (HA-57)
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X 280(P) mm (HA-57: Dimensions CD, TUNER, 435(L) X 11000 X 280(D) (HA-33 TAPE •10 Hz a 40 kHz Poid8 7.6 kg (HA.S7) . 5.4 kg (HA-37) Sensibilité d'entråe/lmpédance PHONO a mV/47 kohms Les caractéristiques techniques et Ia présentation peuvent CD, TUNER, AUX...
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HA-37/57 CIRCUIT BOARD CHECKING AND ESCUTCHEON ASS'Y DISASSEMBLY PROCEDURES PRÜFUNG DER LEITERPLATTE UND FRONTPLATTEN- DEMONTAGE- VORGÄNGE CONTROLE DE CARTE A CIRCUITS IMPRIMÉS ET PROCEDE DE DEMON- TAGE DE PLAQUE DECORATIVE MAIN P.W.B. VOLUME P.W.B. LED INDICATOR P.W.B. HEADPHONE P.W.B. GRAPHIC EQUALIZER P.W.B.
HA-37/57 SERVICE POINT • WARTUNGSPUNKTE POINTS DE SERVICE • As this unit uses a large capacity power supply, Parts installation method be careful of the following points when check- Great care is taken in installing parts to improve the ing and repairing.
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HA-37/57 CHECKING THEOPERATION OFTHEPROTECTION C IRCUIT öo oc oo oo IC901 Pin No. 2 Pin No. 5 Stift Stift5 Broche Broche 5 INPU I PUT 10kQ Oscilloscope AC voltmeter OUTPUT Oszillograph Wechselstrom Audio oscillator Oscil ioscope Voltmeter F requenzgener ator Voltmétre...
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HA-37/57 KONTROLLE DER FUNKTION DER SCHUTZSCHALTUNG Fails die Ausgangsschaltung repariert wurde, indem 2. Funktionsprufung Lautsprecher• Schutz• Z.B. die Ausgangstransistoren Usw. erneuert wurden, schaltung dann müssen Ausgangstransistoren ASO- Darauf achten, daß etwa 7 —10 Sekunden nach dem Schutzschaltung (ASO = Area of Safe Operation) und Einschalten des Netzschalters ein Schaltgeräusch...
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HA-37/57 CONTRÖLE DEFONCTIONNEMENT DUCIRCUITDEPROTECTION Quand le circuit de sortie est réparé å la suite du 2. Contröle de fonctionnement du circuit de pro- remplacement des transistors de sortie, etc., effectuer tection de haut•parleur vérification fonctionnement circuit S'assurer que ie relais fonctionne (un déclic se pro- détection ASO (Zone d'Opération Protégée) pour...
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For SA. as. AS. ZS. as. VS POWER CORO POWER TRANSFORMER GRAPHIC EQUALIZER LED INDICATOR P.W.B. BROWN ORANGE—— MAIN P.W.B. AC OUTLET poWER 'i POWER CORD HEADPHONE P.W.B. —ORANGE VOLUME P.W.B. VOLTAGE SELECTOR FUSE HOLDER OUTLET - —HEO VOLUME P.W.B. POWER POWEA CORD IPANSFORMER...
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R 604 IC701 IC402 R602 MAIN POWER SWITCHING 0602 BALANCE 0601 VOLUME TAPE CONTROL CONTROL RY701 CD/AUX GRAPHIC EQUALIZER TUNER CONTROL S401 S601 FUNCTION LOUDNESS PHONO SELECTOR SWITCH SWITCH IC401 PHONO IC901 EQUALIZER PTOOI POWER (for US, CS) POWER TRANS PTOOI POWER TRANS sool...
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HA-37/57 indicates lead cylindrical ceramic capacitor. (HA-37) PRINTED WIRING BOAD • PRINTPLATTEN • PLAN DE BASE ± indicates those parts that are specified to be used differently tor models and destination. (See the table in the drowings) MAIN P.W.B. GRAPHIC EQUALIZER P.W.B.
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HA-37/57 indicatesaxial leadcylindrical ceramiccapacitor. CIRCUIT DIAGRAM •SCHALTPLAN • PLANDECIRCUIT(HA-37) indicates those parts that a re specified tobe used d ifferentiy formodels and d estination. (See the table i nthe drowings.) : SIGNAL CURRENT TAPE(L) 0401 0402 CD/AUX(L) FLIP-FLOP OVER 2200,'16-...
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HA-37/57 ceramic capacitor. * indicates axial lead cylindrical (HA-57) for models and destination. (See the table in the drowings.) PRINTED WIRING BOAD • PRINTPLATTEN PLAN DE BASE specified to be used differently indicates those parts that GRAPHIC EQUALIZER P.W.B. RB16R...
HA-37/57 CIRCUIT DIAGRAM • SCHALTPLAN • * indicates axial lead cy\indrical ceramic capacitor. PLAN DE CIRCUIT (HA-57) indicates those p arts t hatare specified tobeused differently formodels and destination.(See thetable inthe drowings.) (FuseResistor) SIGNAL CURRENT (FuseResistor) C420L 3 3'50 PHONO...
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HA-37/57 HA-37/57 REPLACEMENT PARTS LIST • ERSATZTEILLISTE • TABLEAU DES PIÉCES CC: Cylindrical ceramic EL: Electrolytic film ME: Metal EXPLANATION OF THE NEW PARTS • ERLÄUTERUNG DER NEVEN TEILE • CF: Carbon film PP: Polypro•pylene ST: styroj FR: Fug 'Bister...
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HA-37/57 HA-37/57 CD: Cernit diæal Cylindrical ceramic Electrolytic "F: film pp: powpro-pylene Styr-ol Carbon film ME: Metal MO: Metal oxide Com ositim resister SYMBOL PART SYMBOL PART DESCRIPTION DESCRIPTION PART SYMBOL PART SYUBOL PART DESCRIPTION DESCRIPTION DESCRIPTION 23370" 4028102 CII'LR 02•oms...
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HA-37/57 HA-37/57 FRONT AND REAR PANEL • VORDERE UND HINTER BEDIENUNGSTAFEL • PANNEAUX AVANT ET ARRIER (HAM) SYMBOL PART SYMBOL DESCRIPTION PART SYMBOL PART '028 2337921 0129631 Knee l") 3301931 HZ07C3 snotnp 0134373 3301932 US. CS) zos02 2331SS2 HZ11A.2 SROI"P...