Sharp RD-720H Service Manual
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SERVICE MANUAL/SERVICE.ANLEITUNG/MANUEL
~-----------------INDEXTOCONTENTS------------------~
®
SPECIFICATIONS
NAMES
OF PARTS
DISASSEMBL Y . . . . . . . . . . . . . . . . . . . . . . . . . ..
MECHANICAL
ADJUSTMENT
TEST TAPES
FOR MEASUREMENT
@
TECHNISCHE
DATEN
BEZEICHNUNG
DER TEILE
ZERLEGEN
MECHANISMUSEINSTELLUNG
TESTBÄ N DER
FÜ R
MESSUNG
®
CARACTERISTIOUES
NOMENCLATURE
DEMONTAGE
REGLAGE
DE MECANISME
BANDES
D'ESSAI POUR MESURAGE
SHARP
Page
2
2
4
5
6
INHAL TSVERZEICHNIS
Seite
3
2,3
4
5
_ . _. 6
TABLE DES MATIERES
Page
3
2,3
4
5
6
SHARP CORPORATION
Do not sale !
• In the interests
of user-safety
original
condition
and only parts
used .
• Im Interesse
der Benutzer-Sicherheit
seinen
ursprü n glichen
Zustand
schriebenen
Teile verwendet
werden.
• Dans l'intt!nH
de la securitt!
de I'utilisateur,
raconstltutä
dans
sa condition
a
identiques
celles specifit!es, doivent
EXPLODED
VIEW
SCHEMATIC
DIAGRAM
WIRING
SIDE OF P.W. BOARD
NOTES ON SCHEMATIC
DIAGRAM
REPLACEMENT
PARTS
LIST
EXPLOSIONSDARSTELLUNG
SCHEMATISCHER
SCHALTPLAN
VERDRAHTUNGSSEITE
DER
LEITERPLATTE
ANMERKUNGEN
ZUM SCHEMATISCHEN
SCHALTPLAN.
. . . . . . . . . . . . . . . . . . . . . . . ..
ERSATZTEILLISTE
VUE
EN ECLATE
DIAGRAMME
SCHEMATIOUE
COTE CABLAGE
OE LA PLAOUETTE
DE MONTAGE
IMPRIME
REMAROUES
CONCERNANT
DIAGRAMME
SCHEMATIOUE
LISTE
DES PIECES DE RECHANGE
RD-720H
DE SERVICE
S3525RD-720H
RD-720H
the set should
be restored
to its
identical
to those
specified
be
sollte dieses Gerä t
wieder auf
eingestellt
und
nur
die vorge-
I'appareil
devra eire
prerniere
et seules
des
pieces
etre utilisees,
Page
7,8
9,10
11,12
13
14,15
Seite
7,8
9,10
11,12
13
14,15
Page
7,8
9,10
11,12
LE
. . . . . . . . . . . . ..
13
14,15

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Summary of Contents for Sharp RD-720H

  • Page 1 RD-720H SHARP SERVICE MANUAL/SERVICE.ANLEITUNG/MANUEL DE SERVICE S3525RD-720H RD-720H • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified used . • Im Interesse der Benutzer-Sicherheit sollte dieses Gerä t...
  • Page 2: Of This Unit

    RD-720H ® FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT. PLEASE REFER TO THE OPERATION MANUAL SPECIFICATIONS Power source: Width; 119 mm (4-11/16") 6V .-:: (DC): Heavy duty manganese Dimensions: Height; 32 mm (1-1/4") battsrv, size UM/SUM-3 or R6 x 4, Depth;...
  • Page 3: Technische Daten

    RD-720H ® ,-------------- --- --- ------- ;-EINE v6i~LSTANDIGE BESCHREIBUNG DER BEDIE- POUR LA DESCRIPTION COMPLETE DU FONCTION- NUNG DIESES GERÄ T ES IST IN DER BEDIENUNGS- NEMENT OE CET APPAREIL, SE REPORTER AU MODE f \JG O'EMPLOI. LANL E_I_TU _E NTJ:I~~_TEN.
  • Page 4 RD-720H ® BIX2 q:,2.6x4mm DISASSEMBL Y Caution on Disassembly Follow the below-mentioned not es when disassembling the unit and resassembling it, to keep its safety and excellent performance: 1. Take cassette tape out of the unit. 2. After servicing the unit, be sure to rearrange the leads where they were before disassembling.
  • Page 5: Mechanical Adjustment

    RD-720H ® MECHANICAL ADJUSTMENT AOJUSTMENT REMARKS ITEM POINTS (CHECK) Azimuth Test tape Azimuth adjust- Adjust for maxi- MTT-113 ing screw mum output. Tape speed Test tape 2,985 10 Hz ± MTT-111 Figura 5-1 ADJUSTMENT POINT Monitor E.V.: ELECTRONIC VOLTMETER Jack...
  • Page 6 RD-720H ® TEST TAPES FOR MEASUREMENT COMPACT CASSETTE TYPE TORQUE METER FOR COMPACT CASSETTE MODEL MEASUREMENT APPLICATION TITLE MODEL FREQUENCY/ APPLICATION RANGE LEVEL TW-2111 10 - 100 g-cm Norma' : P'ayback torque FLUTTER MTT-lll 3 kHz, -10 dB Tepe speed, Wow end f'uner 1.5 - 10g-cm...
  • Page 7 -----12 ---78 --'-20 -----78 ---- -83 ---46 ----5 37---- 78 --- 59 - - - - 29 .- 33 --71 Do not sale !
  • Page 8 , RD-720H ---303 -~-- -.- -_.- --lO5 -----309 308-- 307---- -- --304 111-----· withVR1---- - -- --- -----116 .. - --117 ____ I t-_· _ ---- -- - - ---· - --115 ---,.--- -------110 :&: :"" ---113 i< -", _'"...
  • Page 9 RD-720H r------~----------------------------- 2201l0v '"K+ 1/50V 5.SV 5,6..IC 1 EQ, AMP JJPCI350 · 2 V 5,3V 3.1V ----r---" -LC5 270K TO.OI5 51 _ 3 Ir'l 51-I 0!3_' &.t +-,:;r __ 33 K 1/::IOVI ;--820 a004_? zt;; 10K-A 4 7/6.3V '--- 51-4 RECORD/PLAYB.A~...
  • Page 10 '---------------------------, 01: ISI!?88, IN4148.DS442,DS442Y or MAI50 "VI /6.3V ..MON'Tvl-< 470llCV ':.3 OOFF -----® - 5PEAKEl-< 51-6 ~t>p: R!6 10 ~C13 1110 :Z~Cll 1/50V + C 12 33/6, Ir!_, ~C'7 20lI0':,':: 0.068 :~Cl0 11 : 0.0022 UM/SUM-3x4 > -...J 'R I: Volume ContfOl •...
  • Page 11: Erase Head

    RD-72PH ERASE HEAD RECORD/PLAYBACK HEAD ~I I~ gll~ ...._ HllS II..A.U_ -u- ~ ~ED~ BLACK - .wH1TE~ ~ a,Zo ~o~o~o TLR208 <D 5.a:~ ..2SC2785 E UM/SUM-3x4 I-I~ E C B Figure11 WIRING: -11- Do not sale !
  • Page 12 · RD-720H MOTOR SPEAKER BLACK ~IDE OF P.W.BOARD -12- Do not sale !
  • Page 13: Notes On Schematic Diagram

    RD-720H NOTES ON SCHEMATIC DIAGRAM ® • Resistor: • The indicated voltage in each section is the one measured To differentiate the units of resistors, such symbol-as K is by Digital Multimeter between such a section and the chassis with no signal given.
  • Page 14: Replacement Parts List

    RD..;7 ® ® LISTE DES PIECES REPLACEMENT ERSATZTEILLISTE OE RECHANGE PARTS LIST "HOW TO ORDER REPLACEMENT "BESTELLEN VON ERSATZTEILEN" "COMMENT COMMANDER PARTS" PIECES OE RECHANGE" To have vour order filled prompt'v and Um lhren Auftrag schnell und richtig Pour voir votre commande executee de correctlv, please furnish the following...
  • Page 15: Mechanical Parts

    RD-720H REF.NO, PART NO. PART NO, DESCRIPTION CODE REF,NO. DESCRIPTION CODE Stop Button 97W0036563OOO Switch, Leaf Type, Power 97W0666860006 Record Button 97 W0036563000 Switch, Leaf Type, FF/Rewind 97W0666B61006 Plav Button 97W0036476OOO Switch. Silde Type: Monitor 97 W0666862006 Rewind Button 97W0666863006...
  • Page 16 RD-720H SHARP 51-JE30A 24411-100 S/~R0720H/EGF ------------------------------ 130 - C81086/106002000 A8503-4719NS· T U· J Printed in Japan ln Japan gedruckt Writer and Editor: Engineering Administration Section of Audio Systems Group, Sharp Corp. lrnprirne au Japon Do not sale !

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