Pioneer-RT1011L-tape-sm电路图 维修手册.pdf

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1、 WICEMANUAf, STEREO TAPE DECK FITIIOIIL KU, FV (DriDtoNEEFt RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 through R613 - RL602 - relay con- tact RL601 - S11-2 - 510-2. This causes RL602,to operate. Two motors T.M and S.M are ener, gized through the contacts RL602-1 and RL60

2、2-2 of RL602 to give take-up torque and back tension. RL603: Operates at FAST FORWARD, RE: WIND and STOP. When the shut-off switch (S1b) is ON at STOP, current flows through R614 - RL603 N relay contact RL601 - S11-2 - S10-t, causing RL603 to operate. The series resistl ance R3 of T.M is short.circu

3、ited by the contact of RL603. o Control Circuit for Solenoid Sup- ply Voltase (Fig. 5) This circuit operates to prevent overheating from continuous operation of the solenoid, thereby dropping the current to that.required to hold it ON. In Fig. 5, Q1, Q602, and ZD6OI from a voltage stabilization cire

4、uit supplying the retaining current for continuous operation of the brake solenoids (SL1, SL2) and the pinch roller solenoid (SL3). When the PLAY button is pressed,Sl2 changes over to the PALY position, and a closed loop is formed by the power supply (*) - Q1 : (SLB N D610) / (SL2 - SL1 ry D609) ry

5、relay contacts(RL601) - S11-2 (REW button) S10-2 (F.F. button) r power supply (-). Q1 and Q602 are Darlington conneeted, and between. the base and collector of QG02 is capacitor C62. Immediately after the PLAY button is pushed, much charging eurrent flows rapidly into C621 via power supply voltage(+

6、) - C621- R616 - Q602 in that order, and then the current that flows into Q1 increases. causing the solenoids to operate. When C621 is completely eharged, Q602 bias becomes cbnstant UV nOi5 and ZD6O7 and the cirrrent that . flows into Q1 decreases into holding the continuous operation of solenoids o

7、N. . .Take-up Torque Control in PLAYBACK (Fis. 6,71 In order to.prevent tape slackening or hunting when switching foim the STOP mode to PLAYBACK, the take-up torque is Subject to initially reinforcement. 1. When the tape deck is in the STOP mode (that is with no function button de- pressed). relay R

8、L603 is operative, and the relay contacts short-circuit the series resistor (RB) of the take-up motor (T.M). Please refer to Relay operation.?. 2. When the PLAY button is depressed, 512-1 goes over to PLAY, the current from the FIT-1 cl1 1 L power supply to RLG03 is,cut off, and current flows to RL6

9、02 Even after the current has beeh cut off, RL603 continues to hold. on briefly by means ctf the charge on C620 in parallel with it before releasing. This ensures that when the take-up motor is switched oo, the series resisttr (RB) remains ineffective, increasing the initial torque. As soon as. RL60

10、3 releasing the current flows through R3, and the torqug Drops to the normal level. 3. 4. Sro-z)rz-t Fis. 5 Fig. 6 Fig. 7 9 o Tape Protection at PLAYBACK lmmediately From F.F. (or REW) ( Fig. 8) If the PLAY button is pressed while the deck is in the FAS1 FORWARD (or REWIND) mode, the tape is brought

11、 to a halt briefly before resuming travel at the specified speed, in order to protect it. As shown by Fig. 8. the circuit is structured mainly around Q603 and Q604. 1. The base of Q604 is biased via R60? - R606 - D606 - 510-2 (S11-2) while the deck is in the FAST FORWARD (or REWIND) mode. Q604 is th

12、us ON and relay RL601 is operative. 2. The base of Q603 is connected via R610 to the collector of Q004. When e604 is ON, the base of QG0B is reverse biased, and Q603 is OFF. 3. C619 is charged via R604 (C618) - C619 - R606 - D606 - 510-2 (S1L-2). 4. When the PLAY button is pressed, 512-1 goes over t

13、o PLAY, S10-2 (S11-2) return to their OFF positions, and the base bias loop for Q604 (in step 1. above) is broken. The charge accumulated in C61g, however. Forms the base current of e604 and keeps it on maintining the relay RL601 opera- tive. 5. Even if 512-1 goes over to pLAy, while the relay RL601

14、 is operative, its relay contacts (RL601) will not cause RL602 to operate. 6. As C619 discharges, so the base current of Q604 drops, with a corresponding increase in its internal resistance, and agreater potential difference between the emitter and collector. 7. When this potential difference reache

15、s BV, the reverse bias which had been applied to Q603 becomes direct bias, urrd e603 comes ON. 8. When Q60B comes ON, C61g is rapidly discharged via D60b - R60b - eOOg, Q604 goes OFF, and the relay RL601 releases. 9. As soon as relay RL601 releases, a current flows through R613 - RL602 N relay conta

16、cts (RL601) - 51J.-2 - 510-2, caus- ing relay RL602 to operate so that the tape commences to travel at the specified speed. 10. C619 is fully charged after some 6 seconds of FAST FORWARD (or rewind), and it takes about 6 or 7 seconds after the PLAY button is pressed before the specified speed of tap

17、e travel commences. 11. R604 serrres to delay the charging of C61g and D605 does to accelerate its discharge. If, therefore, the PLAY button is pressed after only from 0.5 to 6 seconds of FAST FORWARD or REWIND CG19 wilt not be fully charged, the time taken for it to discharge (that is during which

18、Q604 will remain ON), and the pause before the tape commences travel at the specified speed will be correspondingly shortened. The Function of C618 Such delay circuit as shown in Fig g would not protect the tape on those occasions when the length of FAST FORWARD (or REWIND) operation is so short - 0

19、.5 seconds or less - that the tape would not come to a complete halt before attempting to commence travel at the specified speed after pressiirg the PLAy button. If not prevented, this would cause the tape stretch or snap. This possibility arises because of the inadequate charge in C619 due to the v

20、ery short time during which the tape deck is in the FAST FORWARD or REWIND mode. In order to prevent it the circuit shown in Fig. 10, incorporating C61g was added. The addition of C618 and R604 prevents the delay in the charging of C619 and provides sufficient voltage to hold Q604 ON instantaneously

21、. Fis.9 Fig. 10 umbers indicate each of characteristics: O C619 onty when C618 is incorporated (Fig.1g) when R604 is incorporated (Fig.g) Voltage necessary to hold 0604 ON Reoe I Rsto. EW Sro-z Srr- z Fis. 8 -_; tFis. 11 3.5 PAUSE ClRcUlT (Fig. 12) When the PAUSE switch (S6) is turned ON in ihe PLAY

22、 and REC modes, the base of Q604 is biased via R608 - D612 - 56 - 512-7 - S11-2 - S10-2 to switch Q604 ON, causing RLG01 to operate. Because of this, the contact of RL601 is closed to operate RL603. This also makes solenoids SL1, SL2 and SLg non-operative. Further, RL602 restored and, through its co

23、ntacts (RL602-1, RL602-2), shuts off the power to T.M and S.M stopping these motors. When the PAUSE switch is turned OFF, the bias to Q604 is cut off and relay RL601 restores. Its contact is opened. But RL603 remains operative until C620 completes dis- charging, improving the take-up torque at the b

24、eginning of tape transport. Reduction of waiting time lag by use of PAUSE switch. When the Fast Forward or Rewind modes continue for more than 6 seconds, CG19 is charged. The deck needs 6 - 7 seconds to start playing when the PLAY button is pressed. This time lag can be shortened using the PAUSE swi

25、tch. 1. QGOa is ON in the F.F. and REW modes. 2. The base of Q603 is connected to the collector of Q604 via R610. When Q604 is ON, Q603 is OFF. 3. C619 is charged via R604(C618) - C61g - R606 - D606 - S11-2 - 510-2. 4. When the PLAY button is pressed, C619 stops charging and discharges via C619 - D6

26、05 - R611 - Q604 - R607 to produce Q604s base bias current, keeping Q604 ON for serveral seconds. 5. When the PAUSE switch is ON, Q603 is forward biased to ON via R609 ry SG - S12-1 - S1L-2 - S10-2 and, C619 is rapidly discharged through the loop C619 - D605 - R605 - Q603. FIT-1 01 1L 6. When the PA

27、USE switch is OFF, the bias loop R608 - D612 - 56 - 512-1 - S17_-I - S10-2 is cut off to turn QG04 OFF. This restores RL601 and operates RL602, start- ing tape transport. 3.6 FUNCTION BUTTONS RELEASE clRcUlT (Fig. 13) When the tape has shut-off switch (S1b) goes OFF, and solenoid SL601 operates to r

28、elease the function button. 1. S15 goes ON when the tape is properly loaded, and feeds the AC supply to the circuit. 2. The base of Q601 is subject to reverse bias via D603 and Q601 is thus OFF, C61? is also charged via D604. 3. When the tape has been fully taken up and S15 goes OFF, no negative vol

29、tage from D603 comes supplied, and the charge ac- cumulated on C6LZ positively biases Q601 via R603, so that Q601 goes ON, and C61? discharges via SL601 - Q601. 4. This discharge is the means by which the release solenoid operates, so releasing the function button which has been depressed. 5. This c

30、ircuit, if S15 is ON will operate if the power supply is interrupted, and automati- cally release the function button. Fis. 13 3.7 TAPE SPEED SWITCHING.OVER The capstan motor is a hysteresis synchronous type, operates at the main power supply frequency. Speed switching is effected by altering the nu

31、mber of poles by means of the SPEED SELECTOR switch S8 19 cm/s(7-1l2 ips.) 4 poles 9.5cm/s(3-3/4 ips.) 8 poles 2SA6?2 tB)x2 11 Fig. 12 4. DISASSEMBLY 4.1 BACK coVERS (Fig. ta) 1. Take out screws 1, 2, b and Z, but only loosen screws 8,4 and 6. Remove the back cover (A). This exposes the internal mec

32、hanism and permits examination. 2. Take out screws 8 back cover (B). The amplifiers can 2 3 4 gDEt-: BOARD 4.2 SIDE BOARDS Take out screws 1 - 8 boards. (Fig. 15) and remove the side- -L3 then and iemove be adjusted. Loisen scr.an/s. w V/, BoARD a, ,/ i w/ T2 Fis. 15 4.3 AMPLIFIER PANEL (Fig. 16) 1.

33、 Remove all knobs. 2. Take out screws 1 - 4 and remove the the amplifier panel. The level meters can then be replaced. FIT-1 c11 L MECHANICAL PANEL (Fig. 17) Take out screws L - 2 and remove the head housing. Take out screw B and remove pinch roller. Take out screws 4 - 6 and remove the reel base. T

34、ake out screws 7 - g and. remove the guide roller. Take out screw 10 and remove the tension arm. Remove the PAUSE knob. Take out screws 12 - 1.7 and remove the mechanical panel by lifting out the aluminum sashes. Take out shaft cap. 4.4 1. , 3. + 5. N3 t-b Fig. t 6 5. TROUBLE SHOOTING 5.1 TRANSPORT

35、MECHANISM AND CONTROL Reel motou refers to the take-up and supply motors. For Nos. 1 - 5. SYSTEM (1). further explanation, see section 5.2, r Power supply Lack of Power ON, and lamps. See 5.2.1 Power and lamps. See 5.2.1 Power andlamps. Improperly positioned REEL.-.-.- f,e11sct position to match ree

36、l size. size switch. Ttonble in reel motors. See 5.2.2 Reel motors. Lamp does not light. See 5.2,3 Pinch roller. See 5.2.3 Pinch roller. e-adjust. See section 6.3. See.5.2.4 Capstan motor. Tape slaekens at start of tape travef. (Supply side) Tape squeals. Excessive back tension uble in capstan motor

37、.- Abnormal take-uP torque.- Relay RL603 released salis1. - Poor back tension. Soiled tape guide Clean with absolute alcohol. See 5.2.3 Pinch r6ller. See 5-2.3 Pinch roller, I,ubricate, clean or replace where necessary. Re-adjust. See section 6.3. See 5.2.4 Capstan.motor. See 5.2.2 Reel motor. Repla

38、ce capacitot (C 620). See 5.2.2 Reel motor. Clean with absolute alcohol. Replace. (Take-up side) Control system does -Burned-out fuse (F 5). Replace. not function LDefective shut-off switch.- Replace. o Playback function. Take-up too weak or -T too strong. I t Insufficient tape speed.Pinch roller sl

39、ipping. Poor pinen- roller pressu Excessive back tension Poor capstan motor torque.- Defective tlpe speed-Defective switch (S 8).- Replaie. switching. Wow andflutter;Dust on pinch roller and + capstan. Defective pinch roller. . - Poor pinch roller pressu.re. - Excessive friction or sticking - of fly

40、wheel bearing. l4 Damaged tape. FrT-1 cl11 L o Fast forward and rewind. Take-up delayed until-;Poor take-up motor torque.-.- .- See 5.2.2 Reel motors. end of tape travel LE*r.iu. back tension see 5.2.2 .,Reel motors., Tighten or loosen tape -Abnormal back winding. tension.- Re-adjust. See section 6.

41、3 Tape slackens at stop of the tape. Mechanical noise operation. Difference in sizes of and left reels Brake timing trouble adjustment. right- Match reel sizes properly. or mal- - See 5.2.5 Brake. during-t-Defective LDefective reel motors. Replace. guide roller. Replace. Short interval-time- Defecti

42、ve capacitors Replace. between fast forward (C618, C619) or rewind to play. 5.2 1. Lack TRANSPORT MECHANISM AND CONTROL Power and lamps. SYSTEM (2l. Replace. Replace. Replace. Replace. of power input;-1-* t I Burned-out fuse. Defective AC cord- Power switch failure. Defective power transformer Meter

43、 lamp does not -lDefective lamp. light LB.,r.ed-out fuse Replace. Replace. 15 2. Reel motors check to make sure line frequency switch is in proper position. Defective ph ase capacitor.- stuck motor shaft._ Defective motor coil.-.- Brake does not clearanc Defective wire wound resistor- (R3orR4). Defe

44、ctive relay contact or -=- relay (RL 602). Imperfect FUNCTION button contact. Replace. Replace the motor. Replace the motor. Re-adjust. See section 6.2. Replace. Replace Replace. No back tension Defective wire wound resistor_ Replace. in playback mode. (R 2). Re-adjust. See section 6.3. Replace. Rep

45、lace. 3. Pinch roller AIso check sotenoid (SL 3). Revolving sound squeaks.- Stuck bearing. Dull rotation, Stuck bearing excessive friction. Pinch roller slipping.- Dirty pinch roller. Clean and lubricate. Clean or replace bearing, then Iubricate. Clean with absolute alcohol. Defective control circui

46、t.- Check circuit and make necesFary repairs. Worn-out solenoid shaft- Replace the solenoid No voltage to motor.l Defective shut-off switch contact.- Replace. L-Burned-out fuse (F6 or F7)-Replace Motor failure despite apparent volage. Defective take-up at playback mode. Defective fast forward.-1-Exc

47、essive back tension.- Re-adjust. See section 6.3. IL.- FUNCTION button contact - Replace. Defective rewind. No back tension in_- fast forward mode. failure. Excessive babk tension._ -.- Poor FUNCTION button_ contact. Defective wire wound lssislel _ (R 1). Rttr *: solenoid -1 Def ec tive transistors

48、( e 1, e 60 2 ).- Replace. i - Defective diode (D610 Replace. toK -1 Insufficbnt attracting-1- Imperfect solenoid installation.- Re-adjust. See section 6.4. force. 16 FtT-1 01 1 L is properly positioned.4. Capstan motor No voltage to motor.-i*Defect lo* L ,f Motqr does not rotate 1l t 6. Function bu

49、tton. Button fails to snap back-Stuck button. Check to see that Iine shut-off switch contact. l* r*,r contact welded.- l- Switch lock plate caught.- Re-adjust. See section 6.2 Repair. Replace switch. Replace switch. frequency switch - Replace. ut fuse (F6)Replace Defective phase capacitor.- Replace. Motor shaft friction,Lubricate. Replace the motor. Replace the motor. Stuck motor shaft Defective motor coil, Also check brake solenoids (SL1, SL2). -r-Defective transistors (Q1, Q602