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Technics RS-B28R Serviceanleitung
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Technics RS-B28R Serviceanleitung

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Service
• The function and operating method of RS-928Rare the same as
for
RS-B28R.
RS-B49R
MECHANISM
SPECIFICATIONS
Deck system:
Track system:
Heads: (Combination)
REC/PLAY;
Erasing;
Motor:
Recording system:
Bias frequency;
Erasing system:
Tape speed:
Frequency response:
Metal;
cr02•,
Normal:
SIN:(signal l evel=max.recording level,Cr02typetape)
Dolby C NR in;
Dolby B NR in;
NR out;
Design and specifications are subject to change without notice.
* 'Dolby'andthe double-D symbol a retrademarks of DolbyLaboratories L icensing Corporation.
Technics
Dolby B-C NR, Auto-Reverse
Cassette
SERIES
Stereo
cassette
deck
4-track, 2-channel
MX head
Double-gap ferrite head
I motor system
AC bias
80 kHz
AC bias
4.8 cm/sec. (1% ips.)
20 Hzru17,OOOHz
30Hzru17,000Hz(DIN)
20 Hzru17,OOOHz
30 Hw16,OOOHz (DIN)
20
30 Hw15,OOOHz (DIN)
75 dB (CCIR)
67 dB (COIR)
57 dB (A weighted)
Manual
Deck
Color
(S)
(K)
(K)
Wow
and flutter:
Fast Forward
and
Rewind
time:
Approx. 90 seconds with C-60 cassette tape
Input sensitivity
and impedance:
LINE;
Output voltage
and impedance:
LINE;
HEADPHONES;
Power consumption:
Power supply:
Dimensions (WXHXD)
Weight:
ORDER NO. HAD85052539CO
Cassette
RS-B28R
RS-928R
Color
(K)...Black Type
(S)...Silver Type
Areas
[M] .......U.S.A.
[MCI .
. ...Canada.
[M] .......U.S.A.
[MCI
.....Canada.
[E] ... ..AII European
areas
except
United Kingdom.
[EKI .....United
Kingdom.
[EGA]... F.R. Germany.
. ...Holland.
. ...Asia,
Latin
America,
Middle
East
and
Africa.
. ...Australia.
0.08% (WRMS)
±0.140/0 (DIN)
0.25 mV/400Q—10
60 mV/47
400 mV/1.5
.
.... ...
........,......AC
60 Hz 120V
..AC 50/60 Hz 220 V
...............AC50160Hz
110V/127v/220v/240v
Preset Power Voltage 240V
(1615/16"
3.6 kg (7 lbs. 15 oz.)
Deck
(RS-B28R)
(RS-B28R)
(RS-928R)
(RS-928R)
(RS-B28R)
(RS-B28R)
(RS-B28R)
(RS-B28R)
(RS.B28R)
(RS-B28R)
kQ
kQ
kQ
80 mV/8Q
18W
mm
x 91/32")
loading

Verwandte Anleitungen für Technics RS-B28R

Inhaltszusammenfassung für Technics RS-B28R

  • Seite 1 ORDER NO. HAD85052539CO Service Manual Cassette Deck Dolby B-C NR, Auto-Reverse RS-B28R Cassette Deck RS-928R Color (K)...Black Type (S)...Silver Type Color Areas [M] ..U.S.A. (RS-B28R) [MCI ..Canada. (RS-B28R) [M] ..U.S.A. (RS-928R) [MCI ..Canada. (RS-928R) [E] ..AII European...
  • Seite 2 RS.B28RIRS-928R • CONTENTS Page Page • Location of Control ....o Printed Circuit Boards Wiring Connection Diagram .... Safety Precaution..... Insulation Resistance Test......21N24 • Schematic Diagram Operation ....o Block Diagram ..

  • Seite 3: Safety Precaution

    RS.B28R/RS.928R SAFETY PRECAUTION (This "safety precaution" isapplied only i nU.S.A.). 1. Beforeservicing, u nplugthe powercord to preventanelectricshock. 2. Whe replacin parts, use onlymanufacturer's recommended components forsafety. 3. Chec thecondition o f thepower c ord.Replace if wear o rdamage isevident. 4. Afterservicin besure torestore thelead dress, insulation barriers, insulation papers, shields, etc.
  • Seite 4 RS-B28R/RS-928R Automatic-reverse system This feature is convenient in the following ways: This is a function which makes it possible to automatically change the direction of recording or playback without ejecting During playback the cassette and then re-inserting •When the reverse mode is set for continuous...
  • Seite 5 RS-B28R/RS-928R RS-B28R/RS.928R DISASSEMBLY INSTRUCTION How to remove the front panel Ref. assembly Ref. Ref. How to remove the case cover to remove the meter P.C.B. Connector O Connector O Connector O Procedure •Remove the 2 connectors (A, A) and 7...
  • Seite 6 [3000±10 Hzl Adjust the azimuth screw (Forward) shown in fig. 3 for maximum output L-CH and R-CH levels. (RS-B28R) Oscilloscope If measuredvalue is not within the standard value,adjust it by using the tape speedadjustment VRshown in When the output levels of L-CH and R-CH are not at maximum at the Fig.
  • Seite 7 Fig. 10 Supplya 1kHz signal from the AF oscillator through ATTto LINE OUT VR8 (R-CH). LINE LINE IN (RS-B28R) Repeat from step (2). Adjust ATT so that input level is —20dB below standard Oscilloscope recording level (standard recording level VU).
  • Seite 8 RS-B28R/RS-928R Oscilloscope Terminal Symbol Name Function/operation Test equipment connection is shown in fig. 16. LINE OUT Place UNIT into record mode. LINE IN Supply 1 kHz signal (—24dB) from AF oscillator, through ATT • Clock oscillation of about 180 kHz.
  • Seite 9 RS.B28R/RS.928R Terminal Symbol Name Function/operation Play plunger out • "L" for a short time in Play/RecPlay/MSoperationchangeover. (1) Stop F. Play Stop/Pause Play command Stop/Pause command + 5 V Stop "H" "H" stop About FWD About 0.3sec, About 0.22sec. REV About 0.05 sec. 0.05 sec.
  • Seite 10 RS-B28R/RS-928R Terminal Symbol Name Function/operation Play/Pause/MS •In Play MODE. indication Play command Stop command About 0.2 sec. (1) "L" with Play command received. (2) "H" about 0.2sec. after STOP command. (3) "L" immediately after power ON in Timer Play mode.

  • Seite 11: Replacement Parts List

    RS.B28R/RS.928R Terminal Symbol Name Function/operation Input scan Input scan Input scan Input scan Input scan 0) PC2 (j) PDC 4.8 msec. 24 msec. When measuringscanning signal, pull up by connecting about 10kQresistorbetweenO, pins and VDD. • ELECTRICAL PARTS LIST NOTES: RESISTORS CAPACITORS ERD..
  • Seite 12 S.B28R/RS.928R CAPACITORS Ref. Part NO. Ref. NO. Part Ref. NO. Part No. Ref. NO Part NO. Value c 34 ECEAIEU4R7 c 49, 50 ECEAIEU4R7 c 89, 90 ECEAIHUOIO c 210 ECKDIH223ZF 0.022 c 78 ECEAIHUOIO c 101, 102 ECKDIH121KB 120p c 211 ECEAIEU102 1000...
  • Seite 13 • PRINTED CIRCUIT BOARDS WIRING CONNECTION DIAGRAM (For [EHI, (For [MI, IMCI, mark Areas.) {EKI, [XL], [XAI mark areas.) (¯ÄAC POWER TRANSFORMER P.C.B. MAIN P.C.B. * (For [MCI mark areas.) 0202 C211 Q152. T501 Power Transformer C220 R26„ 'R20å 2.1II T;...
  • Seite 14 RS.B28R/RS.928R * (For [EKI, [XAI, [XLI mark areas.) P.C.B. AC POWER TRANSFORMER PCB. AC INLET AC INLET T 501 1stormer Power Transformer MECHANISM P.C.B. S903— LED METER/SWITCH P.c. B. IQff_ * (For [MCI, [MI, LEI, (EHI, [XL], [XA , [EGAImarkAreas.)l NOTES: BLK ..Black BLU ...„...Blue...
  • Seite 15 RS.B28 SCHEMATIC DIAGRAM a MAIN CIRCUIT SECTION R 117 LINE LINE sovt Ch ) sovo.33 Gain Ad] Overall 181- 00047 HE AOPHON ES AMP C 49 REC AMP 25 v 4. t C 90 LINE 7 ooo c 37 0.0' ( 72) e 104 2SC2603...
  • Seite 16 * Caution! NOTES: (This schematic diagram may be modified at any time with the IC and LSI are sensitive to static electricity. development of new technology.) Secondary trouble can be prevented by taking care during * The part No. of transistors, IC and diodes mentioned in the repair.
  • Seite 17 BLOCK DIAGRAM LINE overall gain DOLBY (Dolby NR selector) Q 27 Line mute M i c rophone HEADPHONES ,S312 B,'C/OFF v R4 OFF/B,c affer Input control POWERSUPPLY Balance 0161 control 0301 Line mute METER METER Record/ploy back MUTING 0155 Muting control 120B OFF/B/C...
  • Seite 18 RS-B28R/RS.928R • TERMINAL GUIDE OF TRANSISTORS DIODES, AND IC'S Overall M5218L, M5220L gain DOLBY LINE (Dolby NR selector) Line mute AN6882 16 Pin HEADPHONES $312 LN6413E1826 28 Pin TEA0665 B/C'OFF NO 1 Headphones o FF/B.C 2SD1011.T, 2SD1330R 2SB909M. 2SD1225RM MTZ5RIB,...
  • Seite 19 RS.B28R/RS.928R • MECHANICAL PARTS LOCATION Plunger (108) Eject Arm (147) Takeup Reel Table Supply Reel Table (105) (F) ASSY Ass'y (106) Takeup Change Arm (104) Eject Rod (116) Eject Rod (148) Main Lever Ass'y (112) Damper Arm (152) Main Lever Spring (112-1) Eject Rod Spring (148-1) Pinch Roller (F) Ass'y...
  • Seite 20 RS-B28R/RS-928R RS-B28R/RS-928R • Front View • Back View REPLACEMENT PARTS LIST Ref. NO. Part Part Name & Description MECHANISM PARTS HANISM P.C.B. Notes RMDG0005G Head Block Ass'y The value indicated by the torque tape may RJSG0007Z Lead Wire, RIP H...
  • Seite 21 • TECHNICAL GUIDE • Description of mechanism operation PLAY Plug Employed for this unit is the newly developed record/playback auto reverse mechanism. The conventional record/playback auto reverse mechanism (RS-8R series) used two motors (for capstan drive and head up/down operation), while this newly developed mechänism usess only one motor for capstan and head up/down operation.
  • Seite 22 RS.B28R/RS-928R 2) REVERSE OPERATION (FWD REV) O For the mechanism illustration, refer to P32. (auto reverse) (manual reverse) Tape end Push REV button (S305). Reel base stops rotating. PLAY plunger is driven for a moment (about 50 msec). Main control lever unlocks the main gear.
  • Seite 23 RS.B28R/RS.928R RS.B28R/RS-928R RS.B28R/RS.928R CABINET PARTS LOCATION Areas REPLACEMENT PARTS LIST * [M] U.S.A. Important safety notice * [MCI Canada. Components identified by mark have special * [El All European areas exce characteristics important for safety. When replacing any of these components, * [EKI United Kingdom.
  • Seite 24 XZB40X60A02 Protection Cover SQFM16 Instruction Book • Change of Part List (RS.928R from RS.B28R) OWIge of Part No. Description Ref. NO. RS-B28R [MIMCI RS-928R [MIMCJ CABINET PARTS LOCATION SYKM9 SYKM9-2 Cassette Lid ASS'y Case Cover SKCI (M] SGTM17 [MI SGTM38...
  • Seite 25 ORDER HAD85052539CO-A Cassette Deck DEUTSCH Verwenden Sie bitte diese Broschüre Zusammen der Service-Anieitung für das Modell RS-B28R. TECHNISCHE DATEN (WRMS) Stereo-Cassettendeck Gleichlauschwankungen System (DIN) 4 Spuren, 2 Kanäle Spuren ca. 90 s für C-60-Cassette Umspulzeit Tonköpfe (kombiniert) Eingangsempfindlichkeit und Impedanz...
  • Seite 26 Löschen Kopfes Aufnaham/ Wiedergabe 3. Durch Drehcn der in Abbildung 3 gezeigten Azimuth-Schraube (Vorlauf) Kortes Winkel A und C auffinden (den Punkt wo der Spitzenausgangspegel für den linken, bzw. rechten Kanal erreicht wird, ermitteln). Anschlie3end den Winkel B zwischen den Winkeln A und C, d.h. den Punkt, wo der Ausgangspegel linken und rechten Kanals bei maximalem Pegel zusammentreffen, ermitteln.
  • Seite 27 4. Beträgt die auf dem Testband aufgezeichnete Frequenz 3000Hz, so ergibt sich die Genauigkeit nach folgender Formel: f-3000 Genauigkeit der Bandgeschwindigkeit 3000 worin f die gemessene Frequenz ist. 5. Die Messung soll im mittleren Teil des Bandes erfolgen. NORMALWERT: (3000±10Hz) 6.
  • Seite 28 5. Falls der MeBwert nicht im vorgeschriebenen Bereich liegt, auf folgen- Weise einstellen. Einstellung oBeträgt der Löschstrom mehr als 200mA, unterbrechen Sie den Schaltdraht. Gesamtfrequenzgang Bedingung: MeBgerät: o Aufnahme und Wiedergabe o Elektronische Voltmeter o Betriebsart "Normalband" o NF-Generator o Betriebsart "Cr02 Band"...
  • Seite 29 MeBgerät: Dolby-Schaltung Bedingung: 7. Gerät auf Betriebsart "Croz Band" schalten. • Eingangsregler...MAX • Elektronische Voltmeter • Aufnahme 8. Testband QZZCRX einlegen, und Signale von 50Hz, 100Hz, Gesamtfrequenzgangsdiagramm (Cr02, Metal) • NF-Generator • Dolby-Schalter 200Hz, 500Hz, 1kHz, 4kHz, 8kHz, 10kHz, 12,5kHz •...
  • Seite 30 (sens inverse) Réglage de phase canal gauche/canal droit (avant) d'entretien du modéle RS-B28R. Brancher Ies appareils comme indiqué dans Ia Fig. 5. Fig. 3 Dans Ie mode de lecture avant, reproduire le signal de 8kHz de la bande étalon CARACTERISTIQUES (QZZCFM).
  • Seite 31 4. Sur la base de 3000Hz, déterminer la valeur l'aide de la formule. 5. Si la valeur mesurée ne correspond pas å la valeur standard, régler f-3000 selon les instructions ci-aprés. Précision de vitesse 3000 Réglage avec f = valeur mesurée.
  • Seite 32 7. Placer I'lJNlTE en mode de bande Cr02. Condition: Equipement: Circuit de réduction 8. Enlever la bande étalon vierge normale et placer la bande • Mode d'enregistrement • Voltmétre électronique bruit Dolby Tableau de I'ensemble das réponses en fréquence étalon QZZCRX (bande Cr02).
  • Seite 33 Tornillo del Tornillo del Ajuste de fase de L-CH/R-CH azimut azimut. para el model No. RS-B28R. (en avance) (en retroceso) 5. Efectuar las conexiones como muestra la Fig. 5. Fig. 3 6. En eI modo de reproducciön en avance, reproducir Ia sehal de 8kHz desde la Cinta de prueba (QZZCFM).
  • Seite 34 Sobre la base de 3.000Hz, determinar el valor exactitud 5. Si el valor medido no estå comprendido dentro del valor normal, ajus- mediante Ia siguiente fårmula: tar de la forma siguiente: f-3.OOO Exactitud de la velocidad de cinta Ajuste 3.000 •Si la corriente de borrado es mayor que 200mA cortar...
  • Seite 35 7. Poner Ia UNIDAD en el modo de cinta Cr02. 8. Cambiar la cinta de prueba a QZZCRX y grabar seiales Gråfico de respuesta de frecuencia de total 50 Hz, 100 Hz, 200Hz, 500 Hz, 1kHz, 4kHz, 8kHz, 10kHz, (Cr02 Metal) 12,5kHz 14kHz.
  • Seite 36 Circuito Dolby de Condiciön: Equipo: o Modo de grabaciön de ruido (NR) o EVM (Voltimetro electrönico) o Interruptor Dolby NR o ATT ...INIOUT ' Resistor (600Q) Interruptor selector o Oscilador de AF Dolby NR...B/C o Osciloscopio o Controles nivel entrada. Lado de grabaciön o Comprobaciön de las caracteristicas...
  • Seite 37 ORDER NO. HAD8506160P8 Parts Change Notice Service Manual RS-B28R (E/EK/EGA/EH/XA/XL) Order No. HAD85052539CO Model RS-B49R (E/EK/EGA/EH/XA/XL) HAD85052538CO Pleaserevisethe original parts list jn the ServiceManualto conform to the change (s) shown herein. If new part numbersare shown, be sureto usethem when orderring parts.

Diese Anleitung auch für:

Rs-928r