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SERVICE MANUAL

1. AMPLIFIER UNIT CD 7 U Serial No 00001 12000 1 Parts Connection cD 7 1 To Connector J2 of Rear Power Amplifier T 07 8 05 6 2548261 2961 2SA733 or 25 B C B 5 9 2 9 1 9 09 10 lt as pres 733 es 1 A SE s lo av i tsi mira 47 morus mom E LT gt We oi piren 07 ov 911 12 t 278 2SAB26LN W or25A733 47k R D 550 180 1 912 0 1 ees iW 05999 i Wee B To Connector J3 of Front Power Amplifier To Connector J1 of Cassette Deck or FM Tuner QI3 2SABI7A LED D1 01 2 25017401 or2SC945 z9vj To Connector J2 of Rear f Power Amplifier Q3 4 2SAB26LN or IC I TC4069UBPor J 01 2 5 ISI5550r IS To Connector J3 of Front Power Amplifier 1 AMPLIFIER UNIT CD 7 U Serial 00001 12000 ILN To Connector J1 of Cassette 44 Deck or FM Tuner C Ao 2 5v Tiy mes Tess ASE 2 680 005 Wee DOK 39k 8658 OOK ewe 086 1172 680 o6 Ri r ae ies Br 33 Y oo ees tes AN
2. CLOCK REVERBERATION CIRCUIT 1 En M fa E E ATT LPF 7498 Fig 2 CIRCUIT 1 1 Reverberation Circuit The BBD bucket brigade device analog delay element featured in this circuit is connected in series to a P channel MOS analog switch driven by a clock circuit Successive analog signals applied to the BBD are thus delayed Clock frequency is 13kHz and delay time is approx 80 msec This BBD consists of 2048 stages The reverberation effect is produced by extracting the L R signal Graphic Equalizer The circuit enclosed by the dotted lines in the above diagram Fig 3 is equivalent to a simple inductance and resistance circuit connected in series to the IC1 1 circuit at point A The desired frequency resonance circuit is thus formed by C1 and the inductance circuit An equalizer variable resistor VR1 has been connected across the inverted and non inverted inputs of IC1 1 If the VR setting is shifted towards the non inverted input side from the center position the circuit will be cut at the resonance frequency Shifting in the opposite direction will result in a boosting response forming the echo component and then mixing this component with the original signal at a level of 5dB In order to eliminate nois
3. Part No Symbo amp Description GL 2PG1 01 LED CDE 572 J1 Connector CDE 573 J2 Connector CDE 580 J3 Connector 7 VOLUME UNIT To Amplifier Unit Fig 9 Parts List Part No Symbol amp Description Volume 209 W VRI VR7 CCS 210 5 SCHEMATIC CIRCUIT DIAGRAM CD 7 CD 7 U C Serial No 00001 12000 SCHEMATIC CIRCUIT DIAGRAM CD 7 U C Serial No 00001 12000 lt ir T i E id id NOR RE RE kK kh LES 1 95 6 2SCIT OL Nor 250844 TO DECK OR TUNER GROUND Fig 8 4 SCHEMATIC CIRCUIT DIAGRAM AMPLIFIER UN IC 1 TCA069UBP er IPD 4OSSC 01 2 23CM40LNOr 280048 03 4 2BAMROLN or 28AT35 ICE NJME9OIN T 163 wo r AM i a4 I m VER o Hb eo dex ls T oa ot I sn 1 We H E E 019 29A826LNor25A735 020 28A8 TA 921 2501883 OT 9 19898800 15207600 15247 3 X2 062 08 16 2546261 Nor 25 2 ATSS 8 or 182076 0r 18247 S VW
4. CD 7 U C E COMPONENT CAR STEREO GRAPHIC EOUALIZER SERVICE MANUAL Subject Only amplifier units CD 7 U C Serial No 00001 12000 are different The schematic circuit diagram is on page 7 and the amplifier unit is on page 14 For CD 7 E and CD 7 U C from Serial No 12001 on see page 5 for the schematic circuit diagram and page 11 for the amplifier unit SPECIFICATIONS Power source DC 13 8V 11 16V allowable Grounding system 0 0 Negative type Dimensions WxHxD 150 50 x 167mm 5 7 8 x 2 x 6 5 8 in Weight tigate cine ri Oa enr Lee 1 1kg 2 4 165 Graphic range Equalization frequency 60Hz 125Hz 250Hz 500Hz 1kHz 3 5kHz 10kHz Equalization range 12dB Frequency response 20 30 000Hz 3dB Harmonic distortion No more than 0 09 1kHz 70mV Signal to noise ratio More than 70dB Input impedanee senket et SKO Output impedance 1 5 Max output level 200mV 1kHz 1 THD Reverberation time 0 0 7 sec adjustable Note Specifications and the design subject to possible modifi cation without notice due ta improvements VPIONEER CONTENT 1 PARTS LOCATION 1 2 CIRCUIT DESCRIPTION OL 1 3 ADJUSTMENT 3 1 BBD Output Balance Adjustment 3 3 2 BBD DC Bias Adju
5. 10 010 ASIP OMO Ex 2 When there are 3 effective digits such as in high precision metal tilm resi stors 5 62 562x 10 E RNT ASR The mark found on some component parts indicates the importance of the safety factor of the part Therefore when replacing identical designation MISCELLANEOUS NOTICE As for the 01 016 use the same ones and the same rank for both channels Part No _ TC4069UBP uPD4069C NJM2902N MN3008 NJM4558DD 25C1740LN R or 25C945 P K 28A826LN R S or 28A733 P 2SA826LN R or 2SA733 P 2SC1583 2SA817A Y 151555 or 152076 or 1S2473VH 2 062 151886 115 CSG 126 CCS 209 CCP 036 CCP 095 CSR 017 Symbol amp Description IG1 2 IC5 1C8 IC3 IC4 Q1 02 03 Q4 Q19 05 016 017 018 021 020 01 09 010 011 L1 Coil 1 5mH 51 Switch VRI Volume 50k2 W 20k C VR2 Volume 33k2 B VR3 Volume 6 8k 8 RL1 RL2 Relay be sure to use parts of RESISTORS Part No Symbol amp Description RD VS OJ RD PS RDA VS 102J CCN 061 CAPACITORS Part No R1 R19 R21 R27 R30 R38 R40 R42 R101 R162 R167 R168 R201 R236 R20 R28 R29 R163 H166 R39 R43 10042 5W Symbol amp Description COMAH 272K 50 CEAH 470M 10L COMAH 103K 50 102K 50 393K 50 562K 50 CQMAH 563K 50 CSZAH OR1M 35 CQMAH 822K 50 473K 50 COM
6. ES R29 TO Boog 23 R28 Distortion Meter Amplifier Unit Fig 6 DC Regulated power supply 13 8V Low frequency oscillator kee 1kHz 150mV Defeat switch cie ne ada ok n ERR ON To Adjust 1 Bypass R28 by shorting it at both ends 2 Adjust VR2 to find the position of minimum distortion approx 1 2 Notice The connection diagram for CD 7 U Serial No 00001 12000 is different The method of adjustment is the same Refer to the table below for wiring instructions BBD OUTPUT BALANCE ADJUSTMENT BBD DC BIAS ADJUSTMENT DC Regulated power supply DC Regulated power supply 13 8V pin of 16 13 8V pin of 16 GND pin of 12 GND pin of 12 Oscilloscope R29 Low frequency oscillator pin of 2 Distortion meter C10 8 AMPLIFIER UNIT Parts Connection To Connector J2 of Rear _ Power Amplifier Q5 B 2SA826LNor 25A7 33 B C ssv 29v To Connector J3 of Front 1 Power Amplifier _ 99 12 ZSA826LNOr2SA7 33 0 8V t R2IB 47k Q13 16 AM 2SA826LNor2SA733 Cn vae B Res ox L8V SA ore R24 920 2SABI7A cle s sv 13 av To Connector J1 of Cassette Deck or FM Tuner To Connector J2 of Rear Power Amplifie
7. 5 x 16 B90 065 A WN5 x 5 3t B70 056 A Mounting Bracket CNB 198 Connector CDE 393 Seal CAN 291 These seals are applied only to the Model CD 7 C A x P Ne 2 Contain Box vw Carton T us CHB 537 CD 77U CHB 538 CD 7 U CD 7 C CHB 541 CD 7 E Fig 13 lt 79D05F11K gt 1 PIONEER ELECTRONIC CORPORATION 4 1 Meguro 1 chome Meguro ku TOKYO 153 JAPAN PIONEER ELECTRONICS OF AMERICA 1925 E Dominguez St Long Beach Calif 90810 PIONEER ELECTRONIC EUROPE N V Luithagen Haven 9 2030 Antwerp Belgium PIONEER ELECTRONICS AUSTRALIA PTY LTD 178 184 Boundary Road Braeside Victora 3195 Australia lt CRT 1720 gt APR 1979 Printed in Japan 10 EXPLODED VIEW Frame fel P W Board s L BT2x6 9 gt B08 704 A lat LED e XUL GL 2PG1 D Ne Mg B 3 Ner 1 Grille CNS 579 v Panel CNB 513 4 BM2 x 4 B10 802 A g Knob CAA 283 Knob CAA 284 Geox r Volume S kSHWI ZOKSHC NR CCS 209 Sy Switct C 4 CSG 126 N Button P W Board Knob CAA 285 CAC 280 2 8M3x6 Insulator a B10 863 A CNM 575 N NOTICE Parts whose parts numbers are omitted are subject to being not supplied A Cord CDE 666 Screw M3 x 6 B06 363 A Screw M3 x 6 w
8. AH 222K 50 CQMAH 223K 50 COMAH 682K 50 CSZAH 010M 25 CEAH 101M 6L CEAH 100M 16L CEAH 101M 10L CEA 102M 10L CCH 051 52 3R3M 16L ci C2 C22 C91 C92 C3 C5 C81 C82 C6 C75 C76 C7 C8 c9 C10 C11 C67 C68 C12 C59 C60 C13 C14 C15 C16 C83 C90 C17 C18 C19 C20 C23 C21 C93 C94 C24 6800u 16V C51 C52 CS Ee 7 Part No Symbol amp Description Part No Symbol amp Description CSZAH 100M 10 C53 C54 332K 50 C71 C72 CSZAH R22K 35 C55 C56 C69 C70 CSZAH R15K 35 C73 C74 CSZAH R68K 35 C57 C58 COMAH 333K 50 C77 C78 CSZAH R47K 35 C61 C62 C65 C66 CCDSL 331K 50 C79 C80 153K 50 C63 C64 COMAH 103K 50 c95 3 AMPLIFIER UNIT CD 7 U C Serial No 00001 12000 tm Parts List MISCELLANEOUS CAPACITORS NOTICE A As for the Q1 012 use the same ones and the same Part No Symbol amp Description rank for both channels art No Symbol amp Description TC4069 UBP or 1C1 PD4069C TA75902P 1C2 1C5 C8 MN3008 1C3 NJM4558DD 104 28C1740LN R S 01 02 or 2SC945 P 28A826LN R 03 04 or 25 733 2SC1740LN R S 05 06 or 2SC644 R 2SA826LN R or 07 012 25 733 2SA817A Y Q13 2SC1583 Q14 15155 or D1 D2 D5 152076 or 1S2473VH XZ 062 D3 151886 04 002 L1 Coil 0 5mH CSG 126 S1 Switch CCS 209 VR1 Volume 50k2 W 20k2 C CCP 036 VR2 Volume 33k2 B CCP 095 VR3 Volume 6 8k2 B CSR 017 RL1 Relay RESIST
9. B 470 I i ay Rigg vit Tk MA 4 51 sve 2 7K C55 age IC RIOT STA P I 100k T3828 po NJM4558DD pe ab RIZZ 100 3 13 8v 274 Ria 100 I ats 5 3 8v b In i 8124 470 108 78 A i fie gt APP ar 2 7 238 117 89 004 ee 218 3 B TS s L3L 5 HEIE IST gt 5 EM F L i 84 To Volume Unit A 5 8 Q xX e T gt we 27k WIL Le N eg 1 8 He N cu em 6 uj B1 E08 N eae OOOO 13 Vi c74 015 38 S 836 198 RED iu 4 m 0 5 3 rd in ul se ly nar udi 7 1 e i d 0 6 3 E At 1 Soo m m d i teki ar ETE RIGO ST Tr 560 HS 560 04 P 733 Q14 2SCI583 4069C IC2 5 B TA75902P IC3 MN3008 6 or IS2473VH D3 X2 062 04 151886 AMPLIFIER UNIT Parts List NOTE When ordering resistors first convert resistance values into code form as shown in the following examples Ex 1 When there are 2 effective digits digit apart from such as 560 ohm and 47k ohm tolerance is shown by J 5 and 10 5600 56x10 SGT EE RD 1 4PS BEIN J 47kQ 47x10 473 sese RO 1 4PS 1713 J 0 50 ORS RN2H ORG
10. ORS Part No Symbol amp Description RD VS J RD PS DOOS RD VS OOO CCN 061 R1 R19 R21 R27 R30 R38 R101 R162 R167 R189 R191 R193 R20 R28 R29 R163 R166 R190 R39 R40 1000 5W 272K 50 CEAH 470M 10L COMAH 103K 50 COMAH 102K 50 393K 50 COMAH 562K 50 CQMAH 563K 50 CSZAH OR1M 35 822K 50 COMAH 473K 50 COMAH 222K 50 COMAH 223K 50 COMAH 682K 50 CSZAH 010M 25 CEAH 101M 6L CEAH 100M 16L CEA 101M 10L CEA 102M 10L CSZAH 3R3M 16L CSZAH 100M 10 CSZAH R22K 35 CSZAH R68K 35 CSZAH R47K 35 COMAH 153K 50 332K 50 CSZAH R15K 35 333K 50 CCDSL 331K 50 COMAH 123K 50 CSZAH 4R7M 16 CEA 102M 10L CEA 102M 6L or CEA 102M 10L C1 C2 C91 C3 C5 C6 C75 C76 C7 C8 co C10 C11 C67 C68 C12 C59 C60 C13 14 C15 C16 C83 CB4 C87 C90 C17 C18 C19 C20 C21 C22 C92 C51 C52 C53 C54 C55 C56 C69 C70 C57 C58 C61 C62 C65 C66 C63 C64 C71 C72 C73 C74 C77 C78 C79 C80 C81 C82 C85 C86 C92 C93 1 NOTICE Part whose parts number is omitted is subject to being not supplied 11 PACKING METHOD lll i CD 7 U CD 7 C a x Owner s Manual lt CRB 338 CD 7 0 CRD 056 CD 7 C CO 7 E S m CRD 057 CD 7 E Styrofoam CHB 539 set pair Screw Kit CEA 310 Screw M4 x 8 B90 064 A PSB
11. e and sluggishness in the low frequency region the 300Hz to 1600Hz portion of the frequency response is reduced by 3dB in the section from the BPF input to the LPF output Deterioration of S N ratio due to noise generated in the BBD is Prevented by setting the gain of the initial stage amplifier to 6dB INPUT ae OUTPUT CUT A e cac Cia A R 5 3 ADJUSTMENT 4 3 1 BBD OUTPUT BALANCE ADJUSTMENT Connection Diagram GND Oscilloscope C10 DC Regulated 13 O P VR3 14 ower Supply J Amplifier Unit E LL Fig 4 DC Regulated power supply 13 8V Oscilloscope See eaves 5mV Horizontal vass gav SER ev he 50 psec To Adjust 1 Adjust VR3 in order to reduce the amplitude of the oscilloscope waveform to a minimum and obtain Before adjustment After adjustment symmetry about the horizontal axis see Fig 5 ERE ig 1 j ADJUSTMENT 3 2 BBD DC BIAS ADJUSTMENT Connection Diagram me ES je GND 1 DC Regulated 13 P Suppl vas ower Supply Low Frequency Oscillator VR2 Gol I FS ES
12. or M Sn B90 023 E i p SS PEN Screw M3 x 8 d CNB 510 B90 024 E 2 D lt N SA Connector b CDE 574 Resistor 1002 5W w 3 Coil CCN 061 CTF 115 gt p Screw M3 x 6 _ 90 023 Screw M3 x 8 B90 024 E BM3 x 6 B10 863 A Connector 7 CDE 572 Connector CDE 573 BM3 x 6 bP V B10 863 A AO Connector CDE 580 9 CNB 511 B10 863 A
13. r 91 2 2SCI74OLNor 250945 C 7 9V 0045 To Connector J3 of Front Power Amplifier Q3 4 19 25A826LNor 25A733 Q17 18 01 151886 1IC5 lt 8 NJM2902N AMPLIFIER UNIT To LED D1 To Connector J1 of Cassette Deck or FM Tuner in Rimi 2 47k SOk W z 1 4 NJM4558DD 3 3 8v Bp Tu m eo g HEHE r 0 sf ime E 0015 C60 0 047 He ROS 470 RI3O 560 5550585 se mye 064 0 05 659 0047 Se Se 136 470 RES 560 RI wee KE 4 S 4 I 2 5 25 o 8124 BOK RIZY look Ries 470 1 i Q4U30 9 To Volume Unit 8 065 047 28 3 h a Br rer RES I 2 E ceg 022 35 5 SE ab ete 4 7 44 274 3 2 RISO 2 74 C dii i2 gsm uj 5 wf 52 8191816 SN C7 amp 0 05 35 TRI lc ANA Ge TC4069UBP Ic2 IC3 veg 818 c77 ooss or PD4069C NJM2902N MN3008 og pes eds E 14 7 9V 3 3 ev 7 9v Ble Sis 5 3 8 3 8V 12 3 8v 1585 01 9 1515550 1520760 152473 DIO XZ 062 IC s and Transistors 2SA733 2SA826LN 2SC644 2SC1740LN 2SA817A ECB NJM4558DD gt 3 TN w IL 2 TC4069UBP TA75902P uPD4069C 6 MISCELLANEOUS PARTS LIST SOY CS 7
14. stment 4 4 SCHEMATIC CIRCUIT DIAGRAM ss e hn 5 5 SCHEMATIC CIRCUIT DIAGRAM CD 7 U C Serial No 00001 12000 7 6 MISCELLANEOUS PARTS LIST 10 7 MOLEUME UNIT EE 10 8 AMPLIFIER UNIT Lu OO 11 9 AMPLIFIER UNIT CD 7 U C Serial No 00001 12000 14 10 EXPLODED VIEW 17 11 PACKING METHOD 19 1 PARTS LOCATION mnn LLL HALLE LUE 9 7 Relay Grille 58 017 CNS 579 Connector CDE 580 Connector CDE 573 n qp Knob 280 Connector r CDE 572 T2 knob IL CAA 284 The photo sh f models CD 7 E and CD 7 U NG ice t t an MA Suite EN Serial No 00001 Switch Panel CAR 283 i CSG 126 CNB 513 Fig 1 12000 only the amplifier unit section is different 2 CIRCUIT DESCRIPTION Level Diagram SELF BIAS IC IC5 1C08 CONTROL REAR REAR GRAPHIC RIGS CONTROL o POWER sir prj MX EDURE ZEN ATT 51 3 AMP AMP v gt 2 FRONT FRONT CONTROL o POWER AMP AMP 1 IC2 ica IC2 DIFFERENTIAL p NOISE CANCELLER LJ per LPF J v tt

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