Pioneer CT-8R, Service Manual

Page 1: ...e seeservice manual of theCT 7R ARP 001 0 PICINEEFI ELECTFICINIG CCIFIPCIFIATICIN 4 1 Mesu o 1 chome Mesuno ku Tokyo 1s3 Jepen U B PfCI fEEFl ELECTFICX IICB CCIFIFCIIIATICIN A5 Oxfond Dnive Moonechie New iJensey O7O74 u S A PICX IEEFI ELEC F CIN C aEIJFICIFE N V Luithagen Haven 9 2O3O Antwenp Etelgium PfC fEEFf ELECTFICTNICB A JATF ALIA PTY l rE 178 1A4 Eloundeny Fload Bneeside VictoniE 3195 Aust ...

Page 2: ...bit serial data transmission is output from pin 5 of PD6006 This is shown in Fig 1 1 Also a clock pulse is output from pin 7 Data and clock pulse trans mission occurs once each time the key isactivated The 16 bit serial data is applied to pin 3 of the expansion IC PM3001 and the leadingedgeof the clock pulse is read into the shift register of PM 3001 through pin 2 After both read events are comple...

Page 3: ...6 c P u s v FOR POWER S UPPLY CT 8R s r o o t s t o t T o N L Y ci i qs orl tO O O t qr I M E M O R Y O J I I I s w I M E R l i _ t _ _ t s w t HALF SW M S R E A D E R SENSING M R E P E A T I B S M STOP D A T A T PLAY T R E C S T B M O D E I S K I P M O D E t r M T F R S W 8 S REC SENSO R AU TO BLE P A U S EI N D REC MUTE t N 0 M S M U T E P A U S E M R I N D F F T S I N D R E W A S I N D S T O P ...

Page 4: ...d pin 8 goeslow This turns SOL L OFF and SOL R ON placing the mecha nism in a PAUSE status Motor Pin 4 goes high and pin 5 goeslow This turns RM L ON and placesRM R in a STOp status Signal Pathandothercircuits Sameasin the STOP status 5 REC PLAY Mode Key ON Mechanism SameasPLAY Mode Key ON Motor SameasPLAY Mode Key ON Signal Pathandothercircuits When pin 9 is low Q621 Q311 and Q1603 are turned OFF...

Page 5: ...te 9 Direction Key ON in STOPstatus Mechanism Pin 7 goeslow for a 275msecinterval and pin 8 goes high This causesSOL L to turn ON for only 27 msec and since SOL R is OFF the mechanism goes through a direction operation from FWD STOPto REV STOP Motor SameasSTOP status Signal Pathandothercircuits SameasSTOP status P i n No FUNCIION S T O P F F R E W P L A Y REC PLAY STO P PAUS P L A Y REC PLAY P A U...

Page 6: ...EX SCAN indicator output effective lowl X X 1 9 B S IND OUT BLANK SEARCH indicator output effectivelowl X X 20 S K I P I N D OUT SKIP indicator output effective low 2 1 GN D G ND o 22 DIRECTION I N DIR directionlkeyinput Mode key input 23 STOP I N STOP key input 24 REW I N REWkey input 25 F F I N F F key input o 26 PAUSE I N Pausekey input o 27 PLAY I N PLAY key input 2A REC I N REC PLAY key input...

Page 7: ... I v L x L H I Z u g F s g6 PAUSE D I R STOP t l S T O P l I P A U S E f 2 T I l l PLAY l 1 A t i T l l t l I t t I l l l 9 P B M U T E L f l H T r T 2 T 6 l o LINEMUTE _l_ H t l R E C M U T E L H t 2 B I A S L t 3 R E C S W L f t 4 2 5 m S T 2 2 7 5 m S T 2 7 5 m S T 4 2 2 5 m S T 5 t A S m S T 6 4 2 S m S T 7 4 2 S m S T s 3 2 5 m S T e Z g m S T t o l 2 5 m S Fig 1 5 Timingchartof PM3001 1 7 ...

Page 8: ... f R M R L J z M t M H E A O S W L r 9 T9 T s r r T g f e T e 7 S O L L r H R S O L R n z g o P L A Y P A U S E D I R S T O P STOP t I P L A Y PAUSE t T 2 I a I I I l I 9 P B M U T E k l r l I lt H t o LINE MUTE l_ I Tz T r8 it H t l REC MUTE t_ It il H t 2 B I A S L T r L f t o t t T l R E C S W T 9 T 9 T 9 t 9 T 9 9 Fig 1 6 Timingchartof PM3001 2 a ...

Page 9: ...rs H l r M lt Fr lr r r FTz A HEAD SW i rl r l l T g n ili Fl I 7 S O L L ih H T l T r S O L R Tr l l t l Ts I I H E a 2 P ii H P L A Y D I R S T O P S T O P I I PAUSE i l ll if I I PLAY I I L I r it t I 9 P B M U T E n l h_ t Ll t o L I N EM U T E l F i L f3 t l R E C M U T E H l t 6 I t t 2 B I A S L t R E C S W L r 9 Te Fig 1 7 Timingchartof pM3001 3 ...

Page 10: ...O I R R PAUSE_ R P L A Y _ I I I I t 1 I I I rr il i t ii r o i j rdr l P B M U T E t o LINE MUTE t t R E C M U T E n t 2 B IA S R E C S W L Timingchart4 D I R 0 I R E C T I O N T t 4 2 5 m S T a 2 7 5 m S T 2 7 5 m S T 4 Z Z 5 m S T 5 t A S m S T 6 j 4 2 S m S T 7 4 2 5 m S T s 3 2 5 m S T s Z 5 m S T r o t 2 5 m S Fig 1 8 Timingchartof PM3001 4 1 10 Direction operation status r l l wo l I PLAY I...

Page 11: ...F W D PL A Y R M L f R M L t l Tz HEAD SW L I I 7 S O L L L T2 Tr l 1 T2 H T z t I S O L R L u i l T l ii U F s 2 z F P L A Y F PAUSE F D I R R D I R R PAUSE R PLAY _ iir ii il iii il i lf ilT li rr i rrl l_ B M U T E L a n l o LINE IVUTE a n t l REC MUTE d B I A S L t 3 R E C S W D I R D I R E C T I O N Fig 1 12 Directionoperation in PLAY status ...

Page 12: ...ut level to the terminal of the comparator When the level of the terminal reaches that of the terminal the output from the comparator snaps from high to low and the output pulse taken from pin 2 appears as shown in Fig 1 1b CPU PD 6006 uses this output pulse to control the various mechanisms performing the mecha nical functions of auto reverse and automatic stop LED _ REFERENCE PIN JN l t Eb TAPE ...

Page 13: ... 13 Consequently when an input signal is present pin 13 is at a low level and no signal produces a high output This output is used by each of the function operations MS SKIP INDEX SCAN BLANK SEARCH MUSIC REPEAT P M S M U T E L P I N I I 8 L A N K S E A R C H O P E R A T I O N P M S M U T E H P I N I I 9 1 l 1 h 1 ll r 1 l l prllrl n 1 W mlffi ilW lwwmm mffiilffi L 2 5V 70ms Fr 4 v f t1 t 2 5V 3 I ...

Page 14: ...hen input to the blank detector output by pin 13 of PA3010 is held high for 8 seconds or when the tape end sensor is detected the present direc tion of travel is reversed and the tape returns to the position where input to the blank detector snapped from high to low From this position the unit reenters the PLAY mode until a point is reached where the input at the blank detector is maintained at a ...

Page 15: ...ignal is passed via SCF 1 side chain filter arnplifier B and over shoot suppressor C before being applied to adder A where the main and sub signals are recombined 1 5 Input Fig 1 24 InpuVOutputcharacteristic In addition the amplifier B output is applied to rectifier E non linear integrating type via ampli fier D the rectified output being applied to VCR 1 voltage control resistor of SCF 1 This SCF...

Page 16: ...s are completed RECOUT P B O U T Spectral de skewing lst processor high levet stagol 2nd processor low level stagel Inverter ii salgelenR I Inverter saruralton Ft i Adder A r I l l Adder A Overchoot Amp B suppressorC r l l l t l t l g l rl tl tl ii t l l l t l t l rl FiS t ZS Blockdiagram for encoding operation 2nd procesor low lanel stagel lst processor high lovel stagel Adder A lnverter Anti sat...

Page 17: ...tance of the bias circuit is set accordingly This adjustment cycle may be repeated up to four times Then after equalization has been set S I G N A L P A T H IEAD the tape is rewound to the starting position The complete adjustment process requires from 10 to 20 seconds In case one of the adjustments is impossible for AUTO BLE to make it is automatically disabled The tape is then rewound and standa...

Page 18: ...o the right reel carrier is applied to pins 16 and 17 of lC2O2 PA2010 and is output from pin 13 2 This output is applied to pin 32 of IC904 PD6008 3 At the sametime the voltage generated by Hall element H251 HA is applied to pins 5 and 6 of IC903 NJM2903 and is output from pin 7 This output is applied to pin 30 of IC904 Signal input to pins 30 and 32 cause segment data to be transmitted by pins 13...

Page 19: ...a few secondslater 8 As the processeddata is stored in IC904 pin 20 will be locked high and Q921 will remain ON keeping the dot indicator illuminated This reports the fact that the counter is indicat ing real time 9 Remaining tape time is continually processed during tape travel to update the counter 10 The unit indicated by the counter during the PLAY mode is seconds Inthe FAST mode 10 secondunit...

Page 20: ...is produced from pin 25 of ICg04 PD6008 when the tape counter reaches 0000 2 This output passes via the TIMER switch S1017 and S1001 to IC310 PD6006 where it is applied to pin 4 3 The low input at pin 4 signals the program written into IC310 to place the mechanism in the STOPmode llowever if one of the MS SKIP MUSIC REPEAT BLANK SEARCH oT INDEX SCAN switches is activated IC310 will not transmit a ...

Page 21: ...uency generator increasing the rotational accuracy of the capstan motor The referencefrequency 7 4283MH2 produced by the crystal oscillator is divided LlStZO by the divider IC in PD1003 and output as 14b0 8898H2 from pin 15 This signal is input into pin 8 of the confuol IC PA2007 There it is once again divided by Ll2 to produce tlrre725 4L992H2 phasecontrol reference frequency 1 12 REEL MOTOR CIRC...

Page 22: ...ooT T v m lllnnn U LJ tJ P r N 4 P A 2 0 0 7 v Ii t t n u o J LJ PrNvr PA2OO A A A VVV L P r N 3 P A 2 0 0 7 ts _______r______ I XTAL t 7 42A3 Hz PtN2 PA2012 PtN9 PA2012 F I P t N 1 2 P A 2 0 1 2 PtN 12 1 PA2012 il t n t PIN 14 t PA2012 IL nL r Fig 1 37 Capstan motor blockdiagram PrN8 PA2012 iK it_ i PrN14 PA2012 ...

Page 23: ...l l l I 1 J tl l 13 16 s c t 76 Hz P A 2 0 O PrN20 PAzOTO v 20 2 20_t9 PA2OTO 3 5 o t P r N 4 1 4 P A z O r O v r 6 8 P r N2 1 9 P A 2 O T O t L_ o l P r N 3 r 8 P A 2 0 r O v t r t t_i o l r v 3 5 o 12 PAzOOg ML MOTOR 4 PHASE D R I V E crRcu rT P I N PIN v 3i 33 i PAzo o Fig 1 38 Reelmotor blockdiagram Nfl 23 ...