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Technics RS-TR979 Service Manual

Dolby nr-equipped stereo double cassette deck
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ervlce
,,-,.,.
*
DOl
DOLBY
-
NEW MECHANISM FOR RS.TR979 (AR.1)
~

SPECIFICATIONS

.
,
CASSETTE
DECK SECTION
Deck system
Track system
Recording system
Bias frequency
Erasing system
Heads
DECK 1
..-...
DECK 2
Motors
DECK 1
2
DECK
Tape speed
Wow and flutter
For (PP)area
For others
Fast forward and
Frequency response (Dolby NR off)
NORMAL
\
For (PP) area
For others
crO2
......
For (PP) area
For others
Technics
I
~
.
Dolby NR-Equipped
Stereo Double Cassette Deck
I
B.e NR HX PRO
Stereo cassette deck
4-track, 2-channel
Recording/Playback head (Permalloy) x 1
Erasing head (Double-gap ferrite) x 1
Recording/Playback head (Permalloy) x 1
Erasing head (Double-gap ferrite) x 1
Capstan/reel table drive (DC servo motor) x 1
Reel table drive (DC motor) x 1
Capstan/reel table drive (DC servo motor) x 1
Reel table drive (DC motor) x 1
4.8cm/sec. (1-7/8ips)
rewind
times
Approx. 45 seconds with C-60 cassette tape
40Hz-15kHzi:3dB
20Hz-16kHz
40Hz-15kHzi:3dB
20Hz-16kHz
METAL
For (PP) area
For others
SIN
AC bias
(Signallevel=max
NR off
80kHz
Dolby B NR on
AC erase
Dolby C NR on
Input sensitivity
REC (IN)
Output voltage and Impedance
PLAY (OUT)
HEADPHONES
.GENERAL
Power consumption
Power supply
For (PP) area
For
0.1 % (WRMS)
(GC)area
For others
0.07% (WRMS)
Dimensions (Wx H x D)
i:0.2% (DIN)
Weight
Note:
20 Hz-17 kHz
Specificationsare subjectto changewithout notice.
(DIN)
Weightand dimensionsare approximate.
20 Hz-17 kHz
(DIN)
SU6HA5+t
-
ORDER NO. AD9301003CO
an~ua
RS-TR979
Colour
(K)... Black Type
Area
I
Suffix for
Model No.
U.S.A./Canada.
(PP)
Great Britain.
(EB)
Germany, Italy and
(EG)
Continental
Asia, Latin America,
Middle Near East
(GC)
and Africa.
*
HX Pro headroom extension originated by Bang
Olufsen and manufactured
laboratories
Licensing Corporation.
"DOLBY", the double.D symbol, and "HX PRO" are
trademarks of Dolby laboratories
Corporation.
recording level, CrO2 type tape)
and impedance
(Loadimpedance8Q-600Q)
AC 50/60
430x 145x 280mm(16-15/16"x 5-23/32"x 11-1/32")
lOC,:.
1.1 1_1
tv'1 A .STIiR C'-o P'f -
Cassette Deck
Area
Colour
(K)
Europe.
under license from Dolby
Licensing
40Hz-16kHzi:3dB
20Hz-18kHz
20Hz-17kHz
(DIN)
56dB (A weighted)
66dB (A weighted)
74dB (A weighted)
100mV/47kQ
500mV/500Q
37.5mV/(8Q)
28W
AC 60Hz, 120V
Hz,
110V/127V/220V/240V
AC 50/60 Hz, 230V-240V
5.3kg (11.7Ib.)

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Summary of Contents for Technics RS-TR979

  • Page 1: Specifications

    ORDER NO. AD9301003CO ervlce an~ua ,,-,.,. Cassette Deck Dolby NR-Equipped RS-TR979 Stereo Double Cassette Deck Colour DOLBY B.e NR HX PRO (K)... Black Type Area Suffix for Area Colour Model No. U.S.A./Canada. (PP) Great Britain. (EB) Germany, Italy and (EG) Continental Europe.
  • Page 2 RS.TR979 CONTENTS Page Page SAFETY PRECAUTION WIRING CONNECTION DIAGRAM ACCESSORIES INTERNAL CONNECTION OF FL CO NNECTION S PRINTED CIRCUIT BOARDS 43-48 LOCATION OF CONTROLS 4, 5 TERMINAL GUIDE OF IC'S, TRANSISTORS ABOUT THE ATC FUNCTION AND DIODES 7-11 DISASSEMBLY INSTRUCTIONS PAC KAG ING ADJUSTMENT PROCEDURE 12, 13...
  • Page 3 PLAY(IN) '" The REMOTE CONTROL and SYNCHRO EDIT terminals can only The following functions can be operated by remote control be used with selected Technics Components. Please contact your (When connected to the appropriate Technics receiver): dealer for details. Playback, Stop, Pause. Rewindlfast-forward search, Record, and 1-2 (A-B) deck selection.
  • Page 4 RS.TR979 LOCATION OF CONTROL 2) (3 DECK 1 DECK 2 Control section Controls common to both tape decks CD Power" <!> STANDBY/ON" switch @ Reverse-mode selector (REVERSE MODE) This selector is used for selectionof the reversemode(for (POWER, <!> STANDBY/ON) either playbackor recording). @ Dolby noise-reduction button (DOLBY NR) This button is used to reduce the hissing noise heard from the (j) Headphones...
  • Page 5 RS.TR~ @ Stop button (8) @ Tape counter buttons (COUNTER 1/COUNTER This button is used to stop the tape movement. MODE: This button is used to select the tape/linear @ Forward.side playback button ~) counter indication. .--... Thisbutton is used to start the playback or recording of side RESET: This button is used to reset tlie tape counter in- "A"...
  • Page 6 - RS.TR979 .ABOUT THE ATC FUNCTION ATC(auto tape calibration) is the function which identifies the quali- Equalizer setting in progress. ty of the tape (concerning bias, level, equalizer) automatically and C'-' ,-,,-,,-,,-, sets the most desirable recording condition. It takes about 1 U U.U minute to complete the setting.

  • Page 7: Adjustment Procedure

    RS.TR979 .ADJUSTMENT PROCEDURE This unit holds recording bias and equalization data in its EEPROM chip. An internal CPU automatically adjusts playback gain, recording bias, overall gain, and overall frequency response according to the ROM data. Manual adjustment with potentiometers is no longer necessary except for head azimuth and tape speed. AUother items require only measurement data checks.
  • Page 8 Set data (see Fig. 1) to addresses 22 through 7E. After this, set "00" (end) in address 7E and exit from Write mode. After completing ROM writing, press the STOP button on OECK2 to restore the normal Test mode. The four-digit counter on OECK1 displays.
  • Page 9 RS.TR9~ MEASUREMENTS AND ADJUSTMENTS Measurement Condition control; Make sure heads are clean Rec. level Maximum Timer switch; Off Make sure capstan and pressure roller are clean Recording-balance control; Center Judgeable room temperature 20:tSC (68:t9°F) Bias-adjustment control; Center Reverse-mode selector switch; +z Tape-to-tape recording-speed switch;...
  • Page 10 IRS- TRS HEAD AZIMUTH ADJUSTMENT (DECK 1/2) 1. Playback the azimuth adjustment portion (8kHz,.. -20dB) of the test tape (QZZCFM). Vary the azimuth adjusting screw until the output of the R-CH are maximized. 2. Perform the same adjustment in the play mode. 3.
  • Page 11 RS.TR979 PLAYBACK FREQUENCY RESPONSE (DECK 1/2) 1. Playback the frequency response portion (315Hz, 12.5kHz- +6dB' 63Hz, -20dB) of the test tape (QZZCFM). +5dB +4dB -- - 2. Assure that the frequency response is within the range +3dB' " +3dB +2dB +2dB shown in Fig.

  • Page 12: Block Diagram

    .BLOCK DIAGRAM AN73B4N-A l1li ELECTRIC VOLUME EO "" "0", 0059 AN7352S-E2 4N7" PLAYBACK PRE-AMP DOL8 AUTO AUTO D;<J- 0401 REMOTE l ' CONTROL P'-AD" DIS' " --l..k-l!-- -v" v" GNO 1 r-l,-- '-;:' ,,-f- "---'~ LD", "0 eo", 0""" DECK DIID') ")'1 HEAD...
  • Page 13 RS.TR9 PLAnOUTI AN73S35-" 1 'L'" REC EQ AMPIOEC.K2) ,,'7 . IS> '" '" J::-. " " 0"9 "'1 m ",- GND--- -- - "-1 q HEADPHONES AN"SAse-" 23, - OOLBY GREe-L' ' " I \iIi2i "" GP'I,p'l "6235 "PEl ADSlAD91 IIIID 'P' '.
  • Page 14 RS.TR979 MAIN CIRCU DECK I PLAYBACK SIGNAL I L c h) -6.4V. rR ch S OV RIP HEAD "'~ -> '" LL ch "'0: veil 1=8 "'- " o:~< '" C;!!' « nM 5ci'V't) '" ERASE U-,5 HEAD 2.2M 2.2MI '"...
  • Page 15 RS.l l RS.TR979 -GAV 6800P 5.6K ° ",2,+ -> '" ° "'> u<!' ° """~-"'~ """ ",0 ir2S~~~~!!' '" '" '" ° "", ~", ",0 0° D301 ° R305 ",2 MTZJ7R5CTA 150K '" ~- ",0 t;g: ",0 R301 ~~r- IC30 1 2"'~"""...
  • Page 16 RS-TR979 -""'- 0306,356 2SBIO30AOSTA 81AS OSC CONT. 560P 3OmH -II- 120P R328 ---II-- 2.2K « .."'~ "'", R26 10K ;;;«. 120P 0302,303,352,353 0," -53V 2SC3311AOSTA 13;;: " 30mH 560P t7.8VI 81A5 C3I7 C320 0302 R322 « ..~OJ g:'J :;1Q$ :::;;:...
  • Page 17 ,. J. 6.3V Dol by. 8"0r'C.: 3.5V DOlb(C": 2.BV 040~. 2SC3311AOSTA SWITCH ING R405 2.4K ",N IC401 R402 680K R406 2.4K 00() Q401 -404 I C40 I v<D <Do o()Q 1+ 2SC3311AOSTA AN7354SC-E2 0()> :> U<D DOL8Y 81C SELECT IC 150 AN7353S-E2 M62353 REC EQ AMP/DECK I)
  • Page 18 -G,4V, 16V22 C616 10VI000 ",," ",N NO< ~:'!: ~~ 1 N~ I CI AN7384N-A +1\g T+1\~ ELECTR IC VOLUME "- "", N +""" ...8 "'> ",0 0"- "'> "'> """ "", ~:;: +1j", 1jg +~~ "," ",N .'G.3v l"vl """ 14)--(i3) ..
  • Page 19 '" SCHEMATIC (This schematic di~ new technology.) . EI SIGNAL -6.4V 6.3V Note 09,10 2SJI64PORTA 50VI (Rchl IJKI Voltage S601 : selector REC MUTE C616 L ch 10VI000 Resistance are in ohms REC (IN) <:]" ",N -'" N;< ;1:!!! 1<", R ch ~ .", 1 K=1,000 (0),1 M=1,0(...
  • Page 20 '.. SCHEMATIC DIAGRAM 59---64.) (Parts list on pages (This schematic diagram may be modified at any time with the development of new technology.) Note1: . S601:Voltageselector in "240V" position. (For [GC]area only.) (110V 220V 127V 240V) <-> <-> <-> Resistance are in ohms (0), 1/4 watt unless specified otherwise. 1 K=1,OOO (0),1 M=1,OOOk .
  • Page 21 RS.TR9 POWER SUPPLY 1:1 CIRCUIT For (EB)EGJareas. JK601 T60 I CN601 ACIN~ SO/60Hz CN603 POWER SUPPLY 1:1 CI RCUIT For (GC) area. JK601 T601 CN601 bit] AC IN (1IO/127/2201240V '\SO /60Hz :"-A -35-...
  • Page 22 RS.TR979 Note 2: Synchro-start S701 switch (SYNCHRO START). S702 : Tape-to-tape recording-speed switch (SPEED; X1, X2). S703 : Dolby noise reduction switch (Dorby NR; lID, [£]). S704 : Reverse-mode selector switch (REVERSE MODE; = , C'".:> , <'.}O). S705 : DECK 1 Fast-forward switch (~~ TPS).
  • Page 23 RS.TR979 RS.TR979 MOTOR CONTROL CIRCUIT IC501 BA621B 0522 IC501 REEL MOTOR DRIVE 2SB621ARSTA REEL MOTOR DRIVE 0509 0502,504 2SDIB62QRTV6 0530 POWER SUPPLY BI030AQST 2SAI309AQSTA SOLENOID ORIVE 0507 0512,514 0510 REEL MOTOR DRIVE 2SB621ARSTA 2SC3311AQSTA 2SBI030t C.MOTOR DRIVE STA81 LIZER SOLENOID - 7.7V 13.6V C505...
  • Page 24 RS.TR979! METER-L METER-R VR+B V RL ( To 33 pag' VRR ( OSC ( LF IADJ ( PBIADJ MSP ( C L K ( C P4 IC502 DATA ~ POF ( BA6218 IC502 REEL MOTOR DRIVE POWER ( 0525 DMT ~ 051B 2SB621ARSTA STBC'...
  • Page 25 RS.TR979 RS.TR979 CIRCUIT FL50IlRSLOI39-F) 4.8 V NQ 1+ DISPLAY IC506 ;ii> LE93CS: u!£ METERC-"L3 I' EEPROM METER-R ,71\8' :>~ 8129: )5116117118119120121 VR+B V RL To 33pag, 0 SC 6 I C 505 IADJ M38172M4065F PBIADJ MICROCOMPUTER C L K 10 DATA POWER STaG...
  • Page 26 RS.TR979 48 V leso 6 LE93CS74M EEPROM > IC506 '" '" u " 1)-(2J . ov Tov ep707 WRITE CONNECTOR (Fo, leS06) "' '" "' <D " a> a> a> a> 0520 2SC3311AQSTA RESET SIGNAL GENERATO R <t", "'N 0526 HI / 2SAI309AQSTA SWITCHING...
  • Page 27 .WIRING CONNECTION DIAGRAM MOTOR (DECKI ) PC.B. MOTOR (DECK 2) P.C.B. w::==JJ MOTOR CONTROL PC.B. CP505 CP507 CP506 m::::::::::::=J POWER SUPPLY PC.B. MAIN P.C.B. T601 ( Pow" Ho","'m" (OECK I1l- RIP HEAD 5...1 cJcm~ PC.B. CN703 NOTes- CP703 ..!..:.:..:.:.. BI ack CP702 CP70I BLU"...
  • Page 28 RS.TR97 IRS. TR979 PRINTED CIRCUIT BOARDS MAIN PC.B.(REPI500A-M) ERASE CURRENT ERASE CURRENT CHECK POINTtOECK2) CHECK POINTtOECKI) HEADPHONES JACK PC.B. (REPI50IA-S) -43-...
  • Page 29 RS.TR979 r:'I POWER SUPPLY P.C.B. 1:.1 For( pp) area. (REPI502A- PI OUTLET C6[e6 (UNSWITCHED) (120V 60H» '.1Le.~ et:l33 e'"C;4 ~Q406 HfLc40B - S414r---, :i:*"' I lEi C : ee,ete b416 12 L402 ;::: "" ""14 ~ F-"-'- '" ~ '" :420'"...
  • Page 30 POWER SUPPLY P.C.B. For (GC)oreo.IREPI502D-PI IVOLTADJ.I I I 1011 27/220/240V 50/60HZ) r:~, ~ower 'ronsformer) ,c2c2D, FL P.C.B.IREPI50IA-SI -45-...
  • Page 31 RS.TR979 .TERMINAL GUIDE OF IC'S, TRANSISTORS AND DIODES LE93CS47M6TL BA4560FT1 MC14584BFR2 M38172M4065F 14 Pin AN7353S-E2 24 Pin BU2040F-T2 16 Pin AN7352S-E2 28 Pin M62353FPE1 16 Pin AN7354SC-E2 42 Pin "' 40__- MC14052BFR2 16 Pin M62352FPE1 20 Pin " ""- BA6218 M5218AL RVSGP2S24BC 2SB621ARSTA...
  • Page 32 RS.TR979 .RESISTORS AND CAPACITORS Notes: * Capacity values are in microfarads (uFI unless specified otherwise, P=Pico-farads (pF) F=Farads * Resistance values are in ohms, unless specified otherwise, lK=l,OOO (OHM), IM=l,OOOk (OHMI Ref. No. Part No. Values & Remarks Ref. No. Part No.
  • Page 33 RS.TR9i Part Ref.No. Part Values & Remarks Ref. Values & Remarks Values & Remarks Ref.. Part No. ERDS2TJ10l 50V O.47U R547 R637,638 1/4W ECEAlllKAR47B ERDS2TJ223 1/4W R639 ERDS2TJI03 R548 1/4W ECEAlCKAlOOB ERDS2TJ82 1 1/4W 500V 120P R640 1/4W C19,20 R549 ERDS2TJ472 ERDS2TJ412 1/4W...
  • Page 34 RS.TR979 Part No. Part No. Ref.No. Values & Remarks Ref.No. Values & Remarks 25Y O. O lU C602 C330 ECEA1EU222B 25V 22000 & ECBTlE103ZF C332 25V O.OIU C603 ECA111M221B 50V 220U & ECBTlE103ZF C351 25Y O. O IU C604 500V 1000U ECKRZH682PE ECBTlE103ZF 25V 10000 &...

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