Bang & Olufsen Beocord 4500, Service Manual

Page 1: ...Bang Olufsen Beocord 4500 Type 4961 4962 4963 4964 4965 BEOCORD 3500 Type 4966 4967 4968 4969 4970 SERVICEANVISNING SERVICE MANUAL...

Page 2: ...eeeee ernest 3 List of electrical parts sserrrererretr Mekanisk stykliste sseerereeerer estes 4 List of mechanical parts erssrerreeren TStEHIAGEP caden ac eatiee rind reise ncmenneetnes tee 5 Adjustme...

Page 3: ...ca Oe Sota diagr B page 2 4 3 Operation Panel 0 00 cece eee e eee een e eee eee tenes diagr C page 2 5 4 Tape Deck Control 0c cece cece eee eee eee eee eeee diagr D page 2 6 5 Tape Head Rec P B Switch...

Page 4: ...rewind C60 75 sec Frequency range chrome 30 18 000 Hz 3 dB Metal Dolby B NR 64 dB Chrome Doiby B NR 63 dB Ferro Dolby B NR 62 dB Metal 56 dB Chrome 56 dB Ferro 53 dB Driveability 10 000 Hz Metal Chrom...

Page 5: ...pagaldende forsy ningsspending gar til 7 steder pa den pageeldende diagramside 7 CON 7 connections 1 3 EXPLANATION OF DIAGRAM Type numbers of transistors and ICs are indicated on the diagrams If the p...

Page 6: ...n play back 333 Hz 250 pWb mm The signal path in recording pos is shown in left channel and replay pos is shown in right channel ERLAUTERUNGEN ZUM SCHALTBILD Auf den Schaltbildern sind Typen Nummern f...

Page 7: ...lle l autre bout du fil peut tre Ende der Leitung sich befindet trouv VERBINDUNGEN AN EINE ANDERE SCHALT CONNEXION VERS UN AUTRE COTE DU BILDSEITE SCHEMA SCHALTBILD A SCHALTBILD C DIAGRAM A DIAGRAM C...

Page 8: ...le utilis s dans lappareil Bang Olufsen SYMBOLE DES COMPOSANTS SECURITE AN En remplacant un composant portant ce symbole il faut utiliser les composants du m me num ro de r f rence Le nouveau composan...

Page 9: ...bindelser Survey of wire connection to the mains til nettransformatoren transformer fewest 1 ef eis mao moved worse ew marooo 240V GB AUS sorssi0 za 76 73 200 ma T 6600089 sono raf rr ois mart ooo ons...

Page 10: ...ws TAKE UP 24 POWER Bo we RESET TAPE LEADER TTR 6 17 Ss INFORMATION x SILENCE 39 ENABLE Ai PAR SER TAPE DECK DATA Bang Olufsen TAPE DECK FEEDBACK 931C 12 TAKE UP LIR 93811314 POSITION SWITCH TAPE DEC...

Page 11: ...sen 2 2 2 2 RECORD Right CH 28V Mp cr Fe MP Cr Fe 3 ABI LEVEL METER reg T1C6 PLAY BACK Right CH eel a MPICrI Fe MPICr Fe MPICr Fe 8V REF PAUSE iC PPM REC SILENCE Rec P B Switch Right CH REC PB uc 11C2...

Page 12: ...SEO 22u vi 405 c4o8 bard Bs C50LLols 820p Tidn mee 8 Cr MP Fe B12 C4064 It a DIOO 4 8 ee 15 5V Cy C402 2 cc 02 5 83 alt 4066 pice BI7 cig B4 B5 B6 c21 105 106 33 107 B8 B7 B9 cd2 Sees ERP 5 5V ov c22...

Page 13: ...RATION cl 406643 THE WORD DOLBY IS A TRADE MARK OF DOLBY LABORATORIES LICENSING CORPORATION 635 B4 an REC LEVEL RIGHT C36 C200 R201 U 174 IC4 a3 C32 172 ICI cs DOLBY NR LEFT REC LEVEL LEFT BIAS LEVEL...

Page 14: ...0 Sv press dg 5V 3CON 256 RAM REC PLAY 4k ROM P7 2 2 E C ze a R59 680 A AS ek DI7 9 6 es R48 e DATA LINK sy sf Mg aw SVD ue ig i DI6 TAPE LEADER DATA ae re 8k s alhjaipjals a ko j 6 CLP ze REC MUTE c...

Page 15: ...4 Sl __ P9 2 SSA REC LOCKE Pt ty Ty 3 __ P 1 S24 C755 DET pics theta ei te TT _ Pla 7 SCON oA ORWARD beet P cal Ege te or 15 5V o APL AY 5 3CON BC548B 14 8V TRS bay SCON caPstan Nay aly FORWARD UP DOW...

Page 16: ...2 7 PCB3 Operation Panel Bang Olufsen byt cps Gene ethos 4 C cn 5 HE an trogen GP he u...

Page 17: ...6 8300058 209 1N 4148 D29 8300409 214 BAV20 25 D7 8300556 209 Z 62 D30 8300058 209 1N 4148 D10 8300409 214 BAV 20 25 D35 8300058 209 1N 4148 D12 8300058 209 1N 4148 D100 8300409 214 BAV20 25 D15 83000...

Page 18: ...23 4130230 100nF 20 63V C200 4200525 22yF 20 10V C225 4100232 100pF 5 63V C201 4100255 S60pF 5 63V C226 4100255 560pF 5 63V C202 4200517 2 2uF 20 50V C227 4100255 560pF 5 63V C203 4000165 220pF 5 63V...

Page 19: ...pF 20 10V C209 4010105 1nF 10 63V Pl 7220279 Plug 2pol S1 7400200 Switch 3pol IC1 8341041 151 LM 324M IC3A 8340782 136 HEF 4094 B IC2 IC4A 8340816 136 HEF 4071 BP TR1 8320615 51 BC 848B TRI8 8320615 5...

Page 20: ...83 1 2 5011406 5011001 5011014 5011030 5011045 5011058 5010421 1 5 5010727 5011002 5011015 5011031 5011046 5011059 5011071 1 8 5010857 5010787 5011016 5011033 5011047 5011072 2 2 5011335 5010708 50108...

Page 21: ...Housing 3152617 Holder 9107 2732076 Belt 6270360 Cable 9108 2700071 Gear wheel 3034031 Lock 9109 2816246 Spring 2641119 Lock 9110 6032486 Chassis spring 2530465 Bracket 9111 3131308 Housing 2576231 Sp...

Page 22: ...Bang Olufsen Expl view 4 2 4 2...

Page 23: ...4 3 Tape mechanism top 9303 Y ee S 9317 9319 9321 5 9322 59 93S1 9323 9324 4 3 4 3 Tape mechanism bottom Bang Olufsen...

Page 24: ...4 2036063 Screw 2 6x4 13 2622408 Washer 5 2034067 Screw 2x4 14 2622421 Washer 6 2034049 Screw 2x4 w washer 15 2622409 Washer 7 2036023 Screw 2 6x7 w washer 16 2622422 Washer 8 2036010 Screw 2 6x8 w w...

Page 25: ...6 100nF 10 63V C16 4130265 10nF 10 63V C6 4010105 1nF 10 63V C17 4000139 100pF 5 63V C8 4010105 1nF 10 63V C19 C11 4010105 1nF 10 63V C20 4130304 22nF 10 63V C12 C21 4130308 220nF 10 63V PS 7220471 Pl...

Page 26: ...tidig PLAY Tone hovedet vender og skermen kan slippes igen Tryk PLAY og just r skruen F til de 2 kurver pa oscilloskopet er imedfase ved max amplitude Bang Olufsen MECHANICAL ADJUSTMENTS Height and az...

Page 27: ...pe head mount at the screws C for side 1 and B for side 2 There must always be the same number of washers in the two sides Using locking varnish secure the above mentioned screws If the height of the...

Page 28: ...2TP9 2TP10 1R212 1R412 justeres til der males 580 mVi 2TP9 2TP10 Load wow tape part no 6780037 The adjustment should be made in a mid tape position Connect a wow meter with drift meter to the signal...

Page 29: ...10 Tryk REC n gang Record potentiometer indstilles til der males ca 30 mV 5 4 Recording boost Set a tone generator to 333 Hz and 60 mV Load Cr tape Connect an AF voltmeter to 1TP1 1TP2 Press REC once...

Page 30: ...ien er 40 p cm Bang Olufsen While recording and playing back 333 Hz and 15 kHz respectively adjust 2R221 2R421 until the playback level is identical for 333 Hz and 15 kHz Less bias will result in treb...

Page 31: ...6 justeres til der males 9V 0 3V 5 6 Sensor for tape leader Load a non transparent cassette without tape There must be no light from an external source e g from a work lamp Connect a DC voltmeter to t...

Page 32: ...leftes op og fjernes The lid can now be removed by pulling it upwards 4 Betjeningspanel Operation panel En tynd genstand presses op i hullet merket med Insert a thin object in the hole on the bottom...

Page 33: ...of the top panel Skruerne B i bagkanten af toppanelet lesnes Toppladen kan nu leftes op og fjernes The top panel can now be removed by lifting it Bottom Bund Remove the screws C in the bottom The bot...

Page 34: ...kruer D afmonteres Remove the two screws D Dolbyprintet kan nu vippes op The Dolby PCB can now be lifted out Fig 3 Samling af lagmekanismen Assembling the lid mechanism Tandhjulene monteres i den vist...

Page 35: ...el f eks 30 eddikesyre REPAIR HINTS Fejlkilde Trykruller Rem Svinghjul Opsamlemotor midt pa band Remskive Capstanmotor Gearhjul midt pa band Lime stains on aluminium surfaces Fault source Thrust rolle...

Page 36: ...kV er opnaet Her skal den holdes i t sekund hvorefter der langsomt drejes ned for speendingen igen Bang Olufsen INSULATION TEST Each set must be insulation tested after having been dismantled Make th...

Page 37: ...Q als pa 106 R400_ C400 ox 56 ae 15a 5 c4os _ caos en BS as os 2n2 10n a 3 aes B4 9 REC AMPLIFIER LEE SEARCH B4 BS BS cZ1 105 106 43 19788 87 Becde2 SILENCE TAT Yo 15 5V a 227 ii a 2 lo w C203 oS 3 15...

Page 38: ...8 R20645 GamV MA DOLBY LABORATORIES LICENSING CORPORATION C35 i oe 2K 2 RIGHT Ra Vn Esa al eke rv 0 ivi a C36 C200 R201 R202 8s 2n2 4 U WS 1 ra MP AS i i ia Ht NI 1 4 ICA a3 03 P B RIGHT A 15 REC MUTE...

Page 39: ...40 Lig oyp PE is sviscan rou in ce Il ev pee 85s eviscan P7 2 7 t i asd 256 RAM REC PLAY 4K ROM DATA LINK TAPE LEADER DATA iS as cLP 6 REC MUTE BOR 5V Of p g w STROBE cisl ciaciel ics 4094 8BIT e 2 E...

Page 40: ...IR B2 du BC548B 3CON Ree 0 10K AS TRE BC558B ay PEI 3 2 MI P10 9 TAPE LEADER st a SOLENOID ORIVE Tre O BC548B TRS XCON NUMBER OF VOLTAGE CONNECTIONS 9 4 PCB4 Tape Deck Control TIMING CHART FOR THE SO...

Page 41: ...G XX6p GAL 00GH p10d00g py JBESE ELZBESE ON UsNe QUe _p jonueW 9 4a 09 y uaqe4Ula XX6b FAL OOS P10d00q p1 8ESE ELZBESE IN BunyajueeoIMa s Uy XX6p 204 OOGP prcd0ag yL 8ESE ELZ8ESE OU jenUeWEdIAIEg OJU...

Page 42: ...BEOCORD 3500 TYPE 496X See drawings on pages 4 2 List of Mechanical parts 9015 3162315 Cover 9017 3458726 Top Plate 9021 3114308 Chassis...

Page 43: ...UNG SERVICE ANVIS NING SERVICE MANUAL ELZ8ESE PLZ8ES E OOSP Pucd0ag Anod UeNorjUa p jenueYy 2 42 09 y uaqepule ELZBESE PLZBES E OOSP P10d0ag Bunyojuees Alas Uy CLZBESE LZBES E OOSP Ps0000g jenueW ed1n...

Page 44: ...eeee11 JUS TePUNS sc 3d gehen SAN pees Babe oenevwmetas 12 Wartungshinweise cccccce cece eee e eeees13 Bang Olufsen CONTENTS Circuit diagrams cececccceceeeeeee eens 9 List of electrical parts 0 0 cece...

Page 45: ...101 CD 4021 CN IC3 8340605 103 L272M TAPE DECK CONTROL IC2A4 8340782 136 HEF 4094B eee TRI1 8320509 20 BC 548B TR6 8320510 20 BC 558B TR4 TR7 8320523 20 BC 328 25 TR5 8320428 32 BD 436 TR8 3358229 He...

Page 46: ...11 1 Bang Olufsen Expl view 8 a d 54 4 453 Oy ed LP gp 9655 7 92 9456 _...

Page 47: ...dfase ved max amplitude a Bang Olufsen MECHANICAL ADJUSTMENTS Height and azimuth To obtain correct height adjustment height adjust ment tool part no 3624026 must be used Approximate adjustment can be...

Page 48: ...Bang Olufsen 11 3 Expl view...

Page 49: ...Spacer 9431 2938277 Bushing 9432 2816255 Spring f cassette front 9433 3162340 Cover f assy mechanism 9434 2816255 Spring f cassette front 9435 2816261 Spring tape head assembly 9436 2037002 Screw azi...

Page 50: ...lywheels 9489 2722059 Pulley 9490 2851230 Arm 9491 2732099 Belt 9492 2700100 Gear wheel 9493 2722060 Pulley 9494 2932133 Rubber bushing 9495 3152835 Holder motor Survey of screws and washers Other mec...

Page 51: ...2 Kurven am Osilloskop bei maximaler Amplitude in gleicher Phase liegen O99 12 2 RECLAGES MECANIQUES Hauteur et azimut Pour obtenir un r glage correct de la hauteur il convient d utiliser loutil r f 3...

Page 52: ...rket justeres til det udregnede resultat Bang Olufsen ELECTRICAL ADJUSTMENTS Speed Load wow tape part no 6780037 The adjustment should be made in a mid tape position BOTTOM VIEW 0 4 SFRI Connect a wow...

Page 53: ...iden gefundenen Werte abgezogen Stellen Sie Potentiometer SFR1 auf der PCB unter dem Laufwerk auf das berechnete Ergebnis ein BOTTOM VIEW 12 4 REGLAGES ELECTRIQUES Vitesse Introduire la bande de pleur...

Page 54: ...kun vere inde kortvarigt For andre elektriske justeringer se afsnit 5 Bang Olufsen Recording boost Carry out adjustment as described on page 5 4 only 1L200 1L400 must be adjusted to measure 1 05V RMS...

Page 55: ...nur kurzfristig einge driickt Fir iibrige elektrische Einstellungen sehen Sie Abschnitt 5 12 6 Augmentation du niveau d enregistrement Faire des r glages comme decrit sur page 5 4 mais il faut r gler...

Page 56: ...tersyn og ved udskiftning af mekaniske In the case of overhauls and when replacing mecia dele ber nedenstaende retningslinier falges nical parts the directions below should be followed NB Smgremidlet...

Page 57: ...e B Pousser le goujong d arr t a la dir ction de la fl che C et soulever le PCB Sch ma de lubrification Les n cessit s de graissage sont minimaes mais lors d une v rification importante et du rm place...

Page 58: ...5Hz 1 5Hz 3 9Hz 5 6Hz 6 1Hz 10 1Hz 11Hz 27 9Hz Bang Olufsen Fejlkilde Fault source Fehlerquelle Source d erreur Turntable right Turntable left Thrust rollers Flat belt Flywheel right Flywheel left Mot...