Hitachi-HTL55-tt-sm维修电路原理图.pdf
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1、No. 347 EGF HT-t55 CONTENTS . INHALT SOMMAIRE SAFETY PRECAUTION The following precautions should be observed when servicing. 1. Since many parts in the unit have special safety related characteristics, always use genuine Hitachis replacement parts. Especially critical parts in the power circuit bloc
2、k should not be replaced with other makers. Critical parts are marked with A in the circuit diagram. , SPECIFICATIONS Type Platter Motor Speed Speed change system s/N Wow and flutter Speed deviation Speed drift (for timel lfor temperaturel Tonearm Effective length 95 mm Tracking error +0.1 Lead wire
3、 capacitanca 140 pF 2-speed quartz controlled direct drive fully automatic turntable Aluminum alloy dre-cast, 296 mm outer diameter Brushless, Slotless, Coreless DC servo Unitorque motor 2-speeds;33-1/3 and 45 rpm Electronic change-over system 78 dB (DrN-B) 0.025% (wRMS) oo03% O OO37olhour o.0o3% (5
4、 - 35C) Linear tracking tonearm Cartridge Frequency fesponse Output voltage Channel difference Channel sparation Tracking force Weight Stylus tip Power source Power consumption Dimensions Weight the unit to ascertain that Dual magnet type (MT-33) 10 - 25,000 Hz 3.5 mV at 1 kHz, 50 mm/sec. ldBatlkHz
5、23 dB a 1 kHz 1.25 +0259 59s Diamond stylus (DS-ST33) I 20V 60 Hz for U S A and Canada sandard 22OV 50 Hz for Europe standard 240V 50 Hz for U K and Australia standard 11O-12O/22O-240V 50/60 Hz forAsian and Latin American countries 15 watts 315 (W)x83 (H)x 31 5 (D) mm 45ks(1Olbs) 2. Betore returning
6、 a repaired unit to the customer, the service technician must thoroughly it is completely safe to operate without danger of electrical shock. l,vtr I Ett I D. iltt-rALr Dr.rrvilYrArrrE SPECIFICATIONS TECHNISCHE DATEN, CARACTRTSTTOUE TECHN1OUES. . 1,2 FEATURES. BESONDERHEITEN. CARACTNISIOUCS. T, Z SE
7、RVICE POINTS . WARTUNGSPUNKTE. POINTS DENTRETIEN. ADJUSTMENT . EINSTELLUNGEN . RGI.AGE. . 6, 7 BLOCK DIAGRAM .BLOCK SCHEMA. scHEM4. . I REPLACEMENT PARTS LIST ERSATZTEITLISTE . TABLEAU DES PIECES. . 9, O, 15 PRINTEO WIBING BOARD PRINTPI.ATTEN . PLAN DE 8ASE. . I 1 CIRCUIT DIAGRAM.SCHATTPI.AN .PLAN D
8、E CIRCUIT. 12 EXPLODED VIEW . AUSEINANDERGEZOGENE DARSTELTUNG.VUECLATE .3,14 DESCRIPTION OF THE NEW COMPONENT BASCHREIBUNG. DER NEUEN KOMPONENT.DESCRIPTION DE I-A NOUVELLE COMPOSANT. 1 2. 3. Low-mass, dynamic balance linear tracking tonearm Disk jacket size for easy installation anywhere Slimly desi
9、gned Unitorque motor Ouartz control (quartz lock PLL servol Repeat play from any position on disk program repeat) Timer sta from any position on the Cisk 4. 5. 6. SPECIFICATIONS AND PARTS ARE SU moleur a cou- ple unique servo CC 2 vitesses:33-1/3 et 45 trlmn Changement par commutation lectroni- que
10、78 dB (DrN-B) o,o25% (wRMS) o,o03% O,O037o par heure 0,OO3% (enre 5 et 35C) Bras a lecture linaire 95 mm +0.1 Capacit de conducteur Cellule Rponse en frquence Puissance de sortie Diffrence de canal Sparation de canal Force dappui Poids Pointe de lscure Alimentation Consommation de courant Dimensions
11、 Poids 140pF Type mobiles aimants (MT-33) 1O-25O00H2 3.5 mV 1 kHz,50 mm/sec ldBalkHz 23dB1kHz 1.25 +0.259 5,9s Pointe de lecture en diamant (DS-ST33) 12OV 160 Hz pour les normes amricaines et canadiennes 22OV /5O Hz pour les normes euro- pennes 24OV/5O Hz pour les normes britanniques et les normes a
12、ustraliennes 1 1O-12O/22O-240V, 50/60 Hz pour ls pays dAsie et dAmrique Latrne 15W 315 (L)x 83 H) x 31 5 (P) mm 4.5 ks cARACTnrSrrOUeS 1 . Bras de lecture linaire a quilibre dynamique et faible masse 2. Dimensions dune pochette de disque pour grande facilit dinstallation Moteur a couple unique de co
13、nstrc,tion simple Circuit dasservisement de phase par quartz Dtecteur automatiqe de dimension/vitesse de disque sans contact quer point du disque grarnmdeuy a.rpair 5. 6. 7.3. 4- Netzterl sollten nicht durch hnliche Teile anderer Herstellr ersetzt werden Alle krrtischen Teile sind im Schaltplan mit
14、dem Symbol A gekennzeichnet Vor der Auslieferung enes reparierten Gertes an den Kunden muB der Wartungstechniker das Gert einer grndlchen Prfung un- terziehen, um sicherzus.tellen, daB sicherer Betrieb ohne die Gefahr von elektrischen Schlgen gewhrleistet isl MARKMALE 1 2 3 4 Massearmer, dynamisch b
15、alancierter Tonarm mit linearer Rillenfhrung Abmessungen von der GrBe einer Plattenhlle ermglic- hen bequeme Aufstellung berall ,Unitorque - Motor in flachern Design Kristallsteuerung (q uartzgesteuerte P LL-Servoschaltungl Kontaktfreier, automatischer Detektor von Schallplatten- durchmesser und -dr
16、ehzahl Wiederholtes Abspielen von jeder beliebigen Stelle der Schallplatte Schaltuhrstart von ieder beliebigen Stelle der Schallplatte 5. 6. 7. RadioFans.CN 收音机爱 好者资料库 HITACHI HT-155 SERVICE POINTS 1. Removing Control PWB (Figs. 1 and 2 I Remove 6 screws and remove bottom plate Next, remove 8 screws
17、 and the 1 1 P connector 2. Removing microswitch (Power Source) (Fig. 2) After removing bottom plate, remove screw (1 screw) and then the fxing plate. 3. Removing DD Motor (Fig.3) After removing bottom plate and control PWB, re- move 4 screws (Note) There are adjusting screws at 2 positions on the D
18、D motor, and these are fixed by screw locks. As the screws are already adjusted, do not turn them by mistake. 4. Removing Linear Mechanism (Fig. a) Remove 5 screws and, after removing the dust cover, remove 2 screws . 5. Removing Pick-up (Fig.5) (1)After removing the bottom plate, remove the sol- de
19、ring on the phono lead wires (2) Remove the dust cover, turn the worm by hand and move the tone arm about 5 cm inward. (3) Remove 1 screw , remove the rail and and remove the spring from the wire connection part. 6. Removing Wire (1)After removing the tone arm, cating 1 screw (Fig.5). (2) When assem
20、bling, wind the Fig. 6. (Note) remove the wire lo- wire as shown in When winding the wire on care above and below the wire. 7. Replacing Cartridge lnterchangeable with ordinary available on the market. the gear pulley, take plug-in (1 )Turn the power ON, press ARM move tone arm slightly inwards. (2)
21、Turn the power OFF and open dust cover. (3) Remove cartridge fixing screws with a small screw- driver and, holding the tone arm, gently pull the car- tridge out (Fig. 7) 8. Replacing Stylus Press ARM lN button, move tone arm slightly in- wards and proceed as in Fig 8. Stylus DS-ST33 can play about 8
22、OO - 1 500 LP sides before re- placement is required. type cartridges lN button and Flg.2 Abb.2 Fis.3 Abb.3 -3- HITACHI HT-155 Fis.7 Abb.7 , .s. de lecture Fig.4 Abb.4 Gear pulley Getriebe riem en s cheibe Poulie dengrenage Fig.5 Abb.5 Tone arm Tonarm Bras de lecture Pull gently in the direction of
23、the arrow. Vorsichtig in Pfeilrichtung ztehen. Tirer docement dans le sens de la flche. Fis.8 Abb.8 Wire locatino screw Drahtzapfenich raube Vis de possitionnement de c6ble Gear pulley Getrieberiemenscheibe Pourlie dengrenage Rail Sch ene Rail A. Fig.6 Abb.6 cartridge fixing screw ( Tonabnehmer-Bdfe
24、stigungsschrauben Vis de fixation de la cellule ll -4- At HITACHI HT.L55 /r ,- /a WARTUNGSPUNKTE 1. Abnehmen der gedruckten Schalttafel (Abb. 1 und 2l Die Schrauben O (6 Schrauben) entfernen und dann die Bodenplatte abnehmen. Dann die Schr:auben (8 Schrauben) und den 1 1-poligen AnschluB entfernen.
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