Pioneer-CT7R-tape-sm 电路图 维修手册.pdf

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1、() rrtoNeerl ORDER NO. ARP-OO1-O GTITFI GT-EiFI -:-slLr: This photograph is CT-7R. STEREO CASSETTE TAPE DECK PIGINEEFI ELECTFICINIC CC,FTFOFATICIN 4-1. Mesuro 1-chome. r,esu.o-ku. Tokyo 15i3. Japan U.l. FfCtfEEFl ELtCtFEIllCA CAFtpCtATtCt t A5 Oxro.d O.rve, Mnechre. o7()74, n.S,.A FlChlEEFl EI-ECYFI

2、CIa|C (E|JllClFE N.V. Lurhagen-H6we. 9, eGO Anrwe.p, aeEium FlcllEEll E-EcrFE lcrl alJB?FAtta FTy. LiD. i7B-1ga Eoundsry Ro6d, Br66de, vElo.ia 319s, ausE.arre YZ O NOV. t98l Printcd in lapan RadioFans.CN 收音机爱 好者资料库 1. MECHANICAL DESCRIPTIONS 1.1 Mechanism Operation The various mechanical sections of

3、 the recorder are operated using the capstan motor to provide the driving force. The various modes are activated by solenoid L and R, and these are controlled by commands from CPU PD6006. Both the capstan and reel-motor are direct- drive motors fitted with a Hall sensing element. Reel-motor L and re

4、el-motor R (hereafter called RM L, RM R) are used exclusively for tape take-up in the FF, REW, PLAY, and REC/PLAY modes. The direction of rotation and rotational speed of these motoni are controlled by commands from CPU PD6OO6. The right side capstan motor is the DD type, and the left side capstan m

5、otor is belt-driven by the right side-motor. A sub-rotor acts as the actual capstan. (Refer to Fig. 1-1). The mechanism forming the right and left-hand side of the unit is essentially symmetrical in configuration, and in forward and reverse (here- after abbreviated FWD, REV) operations, each side ac

6、ts together. This description covers the mechanical operations for FWD movement. r Basic Operations of the Mechanism The mechanism assumes three different states: STOP, PAUSE,.and PLAY. Consequently, since it can travel in the FWD and REV direction, there are a total of six states possible. There is

7、 also a direction operation for switching between FWD and REV travel. Transition between the FWD and REV state will be described using only one example. When the mechanism, presently in the FWD- PLAY mode, is switched to the REV-PLAY mode, a direction operation is required, then the mecha- nism will

8、 make the transition following the steps listed below. (Refer to Fig. 1-2). Fig. 1-1 Mechanical construction F W O PLA Y Fig. 1-2 Mechanism mode transition (example) Mechanism Mode Transition Flow StateMode FWD STO P REV STOP FW0 PAUSE ttu pAUsE FW0 PLAY REV PL AY STOP statesToP, DtRECT|ON ( DlR) PA

9、USE state PAUSE, PLAY /PAUSE, REC-PLAY,/ PAUSE , FF, REW. PLAY statePLAY, REC,/ PLAY. Fig. 1-3 Mechanism mode transition flow and modes RadioFans.CN 收音机爱 好者资料库 Direction switch ON 1. Instantaneous transit from FWD-PLAY to FWD-STOP. 2. Approx. 500msec after FWD-STOP entered, dirction operation effect

10、s REV- STOP. 3. Approx. 425msec after REV-STOP entered, REV-PAUSE entered. 4. Approx. 325msec after REV-PAUSE entered, Trigger lever R Capstan motor Trigger lever L Sub-rotor Fig. 1-4 Mechanical construction (Rear view) 1. Mechanism Transition from STOP to PAUSE Mechanism viewed from underneath 1. U

11、pon command transmission from PD6006, solenoid R turns ON (plunger retracted). (Fie. 1-6).) 2. The movement of the solenoid plunger causes the trigger lever R to disengage from the stopper, allowing the assist gear R to turn. Solenoid R Assist gear R Plunger Trigger lever R ( -_-/ REV-PLAY entered,

12、thereby con- cluding the switching operation. The above operational flow is also shown using interconnecting arrows in Fig. 1-3. This figure additionally shows other mechanism states possible with the various modes. Next, the mechanism operation when switch- ing between the various states (in the FW

13、D direc- tion) will be described. Cam follower lever Switching plate Pinch-roller R Fig. 1-5 Mechanical construction (Front view) 3. Rotation of assist capstan motor. gear R is meshed with the _ _ _ _ - - - - - r - _ _ - - , FiS.1-7 STOP-PAUSE operation 2 ) Capstan motor ,/ _l 5 Solenoid R Assist ge

14、ar R Assist gear L Solenoid LAssist gear L Hook L Hook R Assist gear R Fig. 1-6 STOP-PAUSE operation 1 RadioFans.CN 收音机爱 好者资料库 2. 3. 4. 4. D. After assist gear R has tumed through about 3/4ths of a revolution, it disengages from the capstan motor. Since solenoid R is in an ON state, the stopper on a

15、ssist gear R contacts trigger lever R at point A, and stops. The above series of opera- tions covers the events occurring on the back- side of the mechanism. Next, the operations occurring simultaneous to the above, but as viewed from the top of the unit will be given. As the B point is raised, hook

16、 R (coupled to B point) is also raised. At point C, hook R catches the coupling plate and continues to rise, carr5ring the coupling plate and pinch-roller drive-plate with it. The pinch-roller drive-plate continues to rise until the pinch-roller goes into a PAUSE status, then stops. Cam follower Fig

17、. 1-10 STOP-PAUSE operation 5 2. Mechanism Transition from PAUSE to PLAY Mechanism viewed from underneath Solenoid R is presently ON, and the mechanism is in a PAUSE state. 1. Upon command transmission from PD6006, solenoid L turns ON (plunger retracted). 2. The movement of the solenoid plunger caus

18、es the trigger lever L to disengage from the stopper, allowing assist gear L to start tuming. / -/!Y- ,8 :y Fig. 1-8 STOP-PAUSE operation 3 Mechanism viewed from the top 1. As assist gear R rotates, its cam drives the B point of the cam follower lever in an upward direction. sorenoid i- I ngger leve

19、r L Pinch-roller drive-plate : -l-. L,-.j liiqr- ij.1 i o() t5, .,iTL T;l # | 3 4 l L l H l H l ffif-rl-l | 3 3 l x l L l H l |-.-l.-|-H I 3 2 l L l H l H l FWD REV CT-7R ONLY i-;aF;-l SIGN l- rjrEc MUTE 4PLAY I F F l_REW !sToP . otR REC,/PB HEAD HALF SW Xtql M s EE-ser REAoER fr:56p SENSING DATA M.

20、 REPEAT T/ BlS CLOCK T- PLAY T- REC STB MOOE T SKIP MOO E Mll F - R S W B / S REc sENsoR AUTO BLE REC irUT PAUSE INO REC MUTE REC IND FLA7 Ms MurE PAUSE M/R INO FF I./S IND REW B/ S I N D STOP SKIP INO OIRECTION GND IF: INTERFACE SR: SHIFT RGISTER AUTO RESET crRcurT CT.7R ONLY CT.7R ONLY r-,-l Fig.2

21、-2 Control system block diagram Q 3 l O Motor Pin 4 goes low and pin 5 goes high, placing RM L in a STOP status and eausing RM R to tum. Signal Path and other circuits Same as in the STOP status. 4. REW Mode Key ON Mechanism Pin 7 goes high and pin 8 goes low. This turns SOL L OFF and SOL R ON, Plac

22、ing the mecha- nism in a PAUSE status. Motor Pin 4 goes high and pin 5 goes low. This tums RM L on and places RM R in a STOP status. Signal Path and other circuits Same as in the STOP status. 5. REC/PLAY Mode Key ON Mechanism Same as PLAY Mode Key ON. Motor Same as PLAY Mode Key ON. Signal Path and

23、other circuits When pin 6 goes high, the reed relay RY501 is turned OFF. ConsequenUy, bias is applied to the REC/PLAY head by the output from the REC AMP and the OSC circuit. As pin 10 and 11 go low, the Dolby amp muting transistor (Q302) and LINE MUTE tran- sistor (Q304) are turned OFF and sound is

24、 output. Also, since Q306 is OFF, the input signal is applied to the REC AMP. When pin 12 and 13 go high, Q310 and Q513 are tumed ON, and the BIAS oscillator circuit is allowed to supply bias to the head. Turning Q513 ON also enables the head to go into a record- only status. 6. PAUSE Mode Key ON (i

25、n STOP status) Mechanism Pin 7 and 8 both go high, turning SOL L and R OFF and placing the mechanism in a STOP status. Motor Same as STOP status. Signal Path and other circuits Same as STOP status. (The PAUSE LED is illuminated however.) 7. PAUSE Mode Key ON (in PLAY status) Mechanism Pin 7 goes hig

26、h, and pin 8 goes low. This turns SOL L OFF and SOL R ON, placing the mecha- nism in a PAUSE status. Motor Same as STOP status. Signal Path Same as STOP status. (PAUSE LED is illumi nated however.) IREE! iroroE rl8ggll 3001 (EXPANSTON IC) TT P42007 PA2012 rol soL trnE R icrRcurT CAPSTAN MOTOR CIRCUI

27、T FOi Tmf rux lto 10 8. REC/PLAY PAUSE Mode Key ON Mechanism Pin 7 goes high, and pin 8 goes low. This turns SOL L OFF and SOL R ON, placing the mecha- nism in a PAUSE status. Motor Same as STOP status. Signal Path and other circuits As pin 6 goes high it turns reed relay RY501 OFF. This, bias is ap

28、plied to the REC/PLAY head by the output of the REC AMP and the OSC circuit. When pin 10 goes low, Q304 and Q302 go OFF and a signal is present at LINE OUTPUT. Since pin 11 is high, Q306 is ON, and the input to the REC AMP is muted. Pin 12 is at a low level, and Q310 tumed OFF, stopping the OSC circ

29、uit. PM30O1 OUTPUT STATE BY MODE Pin 12 is at a low level, and Q310 turned OFF, stopping the OSC circuit. Pin 13 goes high turning Q513 ON, thereby allowing the head to function in the record-only mode. Pin 14 of PD6006 goes low, causing the PAUSE LED to illuminate. 9. Direction Key ON (in STOP stat

30、us) Mechanism Pin 7 goes low for a 275msec interval, and pin 8 goes high. This causes SOL L to turn on for only 275msec, and since SOL R is OFF, the mechanism goes through a direction operation from FWD- STOP to REV-STOP. Motor Same as STOP status. Signal Path and other circuits Same as STOP status.

31、 P i n No. FUNCTION S T O P REW P L A YREC/PLAY STO P PAUSE PLAY PAUSE REC /PLAY PAUSE FwD IREV FWD R EVFWD REV FWD REVFry0 REV F w D I R EV FWD I REV FWO I REV R M . LL ,or H Lt4L ML L 5R M . R L toa HL MLtvt LL L HEAD SW ( rrrooE LL Ln LL H 7S O L . LH OFF) H I LH I L LLH H LH L 8S O L . RH (OFF)

32、L HL H LL FIL I H L I H PB. MUTn o N ) dH L LHH H t oLINE MUTE H (oN) H HL Lfln L t lREC MUTE n (oN ) FIHH LflH H t 2B I A S L ( OFF) L LLn LL t 3R E C L (orF) LL LHL LH t 4REWI N D IOFF) LH L LL t cr rI N D L torar HL LL LL L P L A Y I N DL ,or LLH H LL PDo o 5 H (OFF ) nH Hn LL Lt 4 PAUSE INO Fig.

33、 2-3 PM3001 Output state by mode Pin No. Symbol r/o itatus Description Applicable Model CT.7R CT-6R 1Extal Used by internal quartz oscillator External circuit terminal f = 3.58MHz Pin 2 - GND a 2Xtal 3RESETI NCPU reset input (effective low, normally high) 4M.STOPI NMemory STOP input (effective low)o

34、X 5DATAOUTDATA output to PM3001onrn !_gJ-il_g- - - -t-, L9_ .o.l ,fl-l ,f-l ,f Serial output to PM3001 o 6NC 7CLOCKOUTCLOCK output to PM3001o 8NC 9STBOUTSTB output to PM3O01 S T B 10SKIPOUTSKIP key scan output _r-1_, _r-L J- -l_J- -1_r -l_f KEY SCAN output oo 1 1M/lOUTMUSIC REPEAT. INDEX SCAN key sc

35、an outputoo 12B/SOUTBLANK SEARCH key scan output x 13AUTO BLEOUTAUTO BLE start output *;*-ll l-* r-z.sXx 14PAUSE INDOUTPAUSE indicator output (effective lowl I ndicator output o 15 REC MUTE IND OUTREC MUTE indicator output (effective low) 16MS MUTEOUT MS MUTE output, PA301O MS signal MUTE output (lo

36、w level while reel motor turning during blank detector operation 17M/R INDOUTMUSIC REPEAT indicator output (effective low) I ndicator output X 18r/s tNDOUTINDEX SCAN indicator output (effective lowlXX 19B/S INDOUTBLANK SEARCH indicator output (effective lowlXX 20SKIP INDOUTSKIP indicator output (eff

37、ective low)J 21GNDGNDo 22DIRECTIONI NDIR (directionl key input Mode Key input o 23STOPI NSTOP key input 24REWI NREW key input 25F FI NFF key inputo 26PAUSEI NPause key input 27PLAYI NPLAY key input 28RECI NREC/PLAY key inputo 29REC MUTI NREC MUTE key input 30REC SensorINREC sensor switch input (enab

38、led low, disabled high) Mechanism 31F-R SWI NFWD/REV sensor switch input (FWD: L; REV: H) SW input 32MODE II N Mode selector switeh input Mode selector SW input 33MODE IIIN 34T.RECINTimer REC switch input Timer mode SW input o 35T-PLAYI NTimer PLAY switch inputo 36r/B/sI NINDEX SCAN, BLANK SEARCH, S

39、KIP key input Key matrix input o 37M.REPEATI NMUSIC REPEAT key inputX 38SENSINGI NSensing pulse input (from PA2010 pin) _j-LJ-LI-L: Reel tu rninso 39LEADERI NTape leader pulse detector input (from pin 2, PA301O) n *Tape leader detected X 40MSIN Blank signal input (H level between selection in PLAY.

40、FF, REW; L level during selection; H level all other times) J 4 1HALF SWI NCassette loading switch input (Loaded: L ; Unloaded: H)o 42VDD*5V power source t e FiS.2-4 PD6006 Pin description PA3010 2.4 TAPE LEADER DETECTOR CIRCUIT The tape leader detection circuit functions in the auto-reverse mode to

41、 detect the point of transition from the coated portion to the leader portion of the tape. It then directs the mechanism to reverse the direction of travel, or places the unit in a STOP status when this event occurs from the fast forward (FF) or rewind (REW) mode. The detector uses an optical system

42、 based on an infrared LED whose emission is picked up by a phototransistor. The circuit is activated by detect- ing a difference in the amount of light passed by the coated portion of tape, and the amount passed by the transparent leader. The output from pin 16 of PA3010 is converted to light by the

43、 LED, and passes through the path shown in Fig. 2-5 to be picked up by the photo- transistor. During tape travel, the amount of light received by the phototransistor is quite small, so the input level at pin 7 is held low. This causes the charge and voltage at pin 3 and 4 to also be held low, presen

44、ting a low logic input to the + and - terminals of comparator. This results in a low output from pin 2. But as the transparent leader passes into the light path, the amount of light picked up by the phototransistor suddenly in- creases the input to pin 7. This causes pin 3 to snap high, consequently

45、 applying a high input to the + terminal of the comparator. Output from pin 2 then goes high. As pin 3 goes high, the capacitor connected to pin 4 starts charging, raising the input level to the - terminal of the comparator. When the level of the - terminal reaches that of the + terminal, the output

46、 from the comparator snaps from high to low, and the output pulse taken from pin 2 appears as shown in Fig. 2-7. CPU PD 6006 uses this output pulse to control the various mechanisms performing the mecha- nical functions of auto-reverse and automatic stop. Fig. 2-6 Tape leader detector circuit PHOTOT

47、RANSISTOR PIN NO, t 6 A 5 rr+ ;,TL-r- :ll:ll- n I COATED TAPE LEADER TAPE Fig.2-7 Tape leader detector waves 2.5 END SENSOR CIRCUIT O CTR When the reel motor starts turning, a sensing pulse is transmitted from pin 13 of IC PA2010 (used to control the reel motor) to pin 38 of PD6006. (This pulse is t

48、aken from the Hall element and shaped into a square wave by PA2010.) When this pulse is maintained at either a low (L) or high (H) level for a period exceeding three seconds, PD6006 interprets that to mean the end of the tape and thus switches to the next mode of opera- tion. If the mechanism is in

49、the fast-forward (FF), rewind (REW), or record-playback (REC/PLAY) mode, the next mode entered is STOP. If it is presently in the PLAY mode and the ? reverse mode switch is selected, it also enters the STOP mode. But if pQ is selected, it first goes through a direction operation, then into a PLAY status. O CT.7R Since CT-7R is equipped with a tape leader detector circuit, it goes into a STOP status or goes through a direction operation before reaching the poin