User manual PIONEER CT-20 service manual

[. . . ] FIONEEE ELECTEIONIC CClFIFc'FATIclN OomnsuezSr, L Y Z G ) S E P . l q 3 2 P r l n r e di n J : p d n 1. SPEC|FtCATIONS Systems Compactcassette, 2-channel stereo H e a d s . " H a r d P e r m a l l o yr e c o r d i n g / p l a y b a c ka d x 1 " . he " F e r r i t e "e r a s i n h a dx g 1 l \ 4 o t o r . . [. . . ] 3-18), the drive arm is moved to the left, and the drive gear on the arm engagesthe supply reel gear resulting in rotation of the supply reel base. At the same time, the pin at the tip of the drive arm pushes the brake plate up, thereby releasing the reel brake. Brakeplate Brakeshoe SolenoidR I Supply reelbase Brakeplate Drivearm F i g . 3 - 1 3 R e w i n do p e r a t i o n F i g . 3 - 11 P L A Y - + S T O Po p e r a t i o n Fast Forward Operation When solenoid F is activated, the drive arm is moved to the right, and the drive gear on the arm engagesthe idler gear, resulting in rotation of the TU reel base as shown in Fig. At the same time, the pin on the branch of the drive arm pushes the brake plate up, thereby releasing the reel brake. Brakeplate Brakeshoe SolenoidF Drivegear TU reel base Brakeplate Drivearm bracketpin D r i v ea r m F i g . 3 - 1 2 F a s tf o r w a r do p e r a t i o n I 4. BLOCK DIAGRAM , . MIC AMPLIFIER + t<_ 25 dB _____->l E Q U A L I Z E RA M P L I F I E R REC, /PBHEAD CONTROL CIRCUIT E R A S EH E A D 20 dB --*l I MPX FILTER D O L B YN R C t R c u t T I REC AMPLIFIER M E T E RC I R C U T I -ql H I G HI h6 | I METAL -l ffinu-c'o'3 0 t - 7 s30r-3 s LINE O UT P U T swrTcH stor : I N P U TS E L E C T O R TAPE SELECTOR s 3 0 r - 7 : APE SELECTOR T s 3 0 r - 9 ;D O L B Y N R LINE I. IOR U CrOa ON ON ON oN ON ON - MIC II IEN METAL OFF OFF OFF oFF OFF s60r : s6O2 r I tc roz 5604 s605 s606 S9Ol s r20l FF REW STOP i P L AY . P AU S E r REC oN -_qir OFF r POW R E P E R A S E R E V E N T E T E C T O R O L E - N OH O L E D H T h e u n d e r l i n e d i n d i c a t e st h e s w i t c h p o s i t i o n . P O W E RS U P P L Y C I R C U I T +Bt(il. 7v) + 82(12. 3v) +83(r2. 3V) +84(5V) 11 5. DISASSEMBLY Counter belt Eiectknob N D oor assembly N. - knob assemblyS Volume Volume knob panel t1 1. Remove the bonnet by undoing screws O and lifting the back part of the bonnet up and pulling it to the rear. Remove the cassette door by pushing the eject button to open it and then pulling it up and out. The volume assembly can be removed along with the volume panel by pulling off the volume knob and then undoing the volume assembly, s hexagonal nut. The counter is removed by undoing screws @ and slipping off the counter drive belt. The counter drive belt can be temporarily rested on the side panel R assembly of the mechanical assembly. 5. 40. RKP-663 RWX-637 RKNO82 RKB-O18 RKP-629 RKP630 RKP628 17 /frN 75 lr I'u -A--65 S-ss . /l \ I W' 28 18 K r 77 T @-so 32 48 tt@ N< q6 )'N}&)1, *6ef 6e< xo TA* "p9-Ui-so Bt4, f_65 il35 b\ K "f, 77 T\ I --at' 19 Part List Mark No. Description Eject lever Eiect leverspring Eject spring Cylinder O ring Piston Pocketspring Pocket Lock lever L o c k l e v e rs p r i n g Detecterlever Slide switch SideplateLassembly Half spring Half recectacle Mark No. RXB-715 RNLOsg RXB-723 RBH42 RXB-374 RBH-724 RNK-999 RXMO76 Description T U r e e l b a s ea s s e m b l y Cam gear Lever assembly Leverspring ldler arm assembly ldler pressurespring TU idler Motor assembly Flywheel holder Thrust receptacle Flywheel assembly C a p s t a nb e l t Cordclamper Side plate R Washer RBH-949 RBH-951 RNL-261 REB447 RNL-534 RBK-175 RNL-525 RBH-948 RNL-529 RSH{58 RNH-219 RNL-524 ** ** RXB-717 REB483 R N E - 5 13 YS3OFUC 16. 50. RBH-778 RBH65 REB416 RN L-527 R X B - 7 16 RBH-794 RPB-G)G (RPBO8S) RPB-089 RBH-723 RNL-523 RKP63 RKP-127 ( R K P - l 3 1I RNLO47 Returnspring Head base HB return pring s Shaftstopper pin Reference Metal holder assembly HB drive spring Connector assembly 2P E r a s eh e a d REC/PB head Head adlust spring Sub head base Connector assembly 6P PlungersolenoidR Solenoid arm Solenoid bracket R PlungersolenoidF Solenoid bracket F Gear leverreturn spring Gear lever P l u n g e rs o l e n o i d P Chassisassembly Counter belt PMS plate Pinch arm assemblv Pinch pressure pring s Drive belt Drive arm full assembly FR spring Reel base assemblv Brake spring Brake plate Brakeshoe ldler gear S u p p l y r e e l b a s ea s s e m b l y YS3OFBT Washer VCZ26PO9OF MC Screw PMZ26P1OOFMC Screw VCZ26P06OFMC Screw YE4OFUC Washer R BFO5O PMZ2OP1 0FMC 5 |MZ20Y1 50FMC RNF-989 PMZ26P060FMC PMZ26P030FMC YE2OFUC YS2OFBT WA21D040D025 WA17D032D025 Oil stop washer Screw Screw Spacer(0. 1) Screw Screw Screw Screw Washer washer * ** A * PMA26P040FMC Screw A * RXP-126 (RXP-130) RBH-722 RNL-OSl RXP-125 ( R X P - 12 9 ) REB468 RXB-720 RBH-89O REB446 RXB-376 RBH-725 RXB-721 RBH-727 REB-187 RNK-998 RXB-714 ** ** ** * 8 . E L E C T R I C A LP A R T S L I S T NO?ES: o When otdering resdsfors, first conuert resistance values into code form as shown in the following examples. I when there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47h ohm (tolerance is shown by J = |Vo, and K = lOVo). 010. . RN2H OBE/( BSIPO0Ok Ex' 2 When there are 3 effectiue digits (such as in highjr-ec-ision metal film resistors). mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. c For your Parts Stoch Control, the fast mouing items are indicated with the marhs ** and *. This classification shall be adjusted by each distributor because it depends on model number , temperature, humidity, etc. Miscellaneous List Parts P. C. BOARD ASSEMBLIES Mark Part No. [. . . ] Unless otherwise specified, adjust with the DOLBY NR switch in the OFF position. Also leave the deck in playback and recording mode respectively for 3 to 5 minutes before starting playback and recording frequency response adjustments. 1 Oosec 1 Oosec so. ec 1 OOsec Fis. 12-4 STD-341Atest tape VR201-{: ( P BL E V E LR ) vnrol \ @ ( P B E V E L@ L} L vR102-------@ ( R E cL E V E L L @ J L vR202' ( R E CL E V E LR ) Fig. 12-5 Adlustment. points 32 12. 2. 1 DOLBY NR LevelAdjustment Settings AC mV meter Input signal Tape selector . Connect to DOL L (L ch) and DOL R (R ch) - 10dBv (316mV) to 2kHz, LINE INPUT NORM Record _pr Erase head Head azimuth adjustment screw REC/PB head Fig. 12-8 Head azimuth adjustment Procedure Adjust the azimuth adjustment screw for maximum AC mV meter reading. [. . . ]