Bang & Olufsen BEOGRAM 4002 Service Manual Download | Manualshive

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Summary of Contents for BEOGRAM 4002

Page 1: ...wes VeeL ESET a a HS C471 QR OL B YPE 5523 5526 EOGRAM 4002 4004...

Page 2: ...ight channel is bracketed e g B3 C2 The diagrams which may be unfolded are placed at the back of the manual so that it is possible to cpen at the preceding pages at the same time The service manual is...

Page 3: ...system Electronic Anjishaling Parallel tracking error angle compensaled Molor Servo contoted OG Drive system Bell Turntable 30 cm 1 3 kg Dust cover Hing d and detachable Fower supply 117 valts Frequen...

Page 4: ...ctor goes high this level is transmitted through 1D8 to the base of series transistor LIC as forward bias with the result that voltage is available fram the power supply section The high level is like...

Page 5: ...negative feedback tor the power amplifier see sketch preventing overregulation 1D14 1149 1R21 provide a guarantee that the voltage across the motor can only reach a certain value sec sketch Amplit co...

Page 6: ...sition marker is very narrow 1C21 cannot obtain 2 full charge before 41C1 and consequently 1TR17 are forward biased Since a4 17 cm record is on the turntable the conditions for lowering the pickup arm...

Page 7: ...c switch to activate its LOWER section To ensure that 1C20 will not pick up a charge from the speed change switch through 1D21 and 1TR7 1D50 shorts the base of 1TR17 to chassis potential when the coll...

Page 8: ...er Power supply The CD 4 demodulator has a stabilised power supply of its own which uses the power supply of the control circuits as reference Pa 9 Say Carrier detector The power supply series transis...

Page 9: ...ther to subtract them so as to obtain the rear signai The difference signal is fed from the output of the ANRS circuit ta the base of TRG TR8 and TR9 operate as a differential amplifier The two transi...

Page 10: ...w and if a CD 4 record is being played the low level at the emitter of TR107 will be irans mitted to the bases of TRS TR15 and TR16 respectively both the front and rear channels will then be open If t...

Page 11: ...amped to 12 through D1 and rectified through D2 resulting in the appearance at the anode of D2 of a DC voltage whose value will be High 30 kHz level low DC level and vice versa This DC level is applie...

Page 12: ...hassis i e the surface of the turntable must be parallel with the cover plate Check height adjustment 23mm both at the rim of the turntable and nearest the centre Haigh and side adjusiment of chassis...

Page 13: ...Loosen screws D Puil arm A in the direction of the arrow uniil the separation between arm A and arm B at the point C is 1mm Move the thagnet coil until the armature is the whoie way down and tighten...

Page 14: ...and forth so that the stylus falls into the groove C Retain the tool in this position Raise the pickup and run it in towards the centre Lower the pickup in the position shown in the sketch Tf the styl...

Page 15: ...8 is 49 4 mm Make sure that the surface E is perpendicular to the rod D Tighten screws A With the screws F loosened adjust the detector arm to be parallel with the pickup arm at a distance of 7 7 mm t...

Page 16: ...ni of damper cylinder Adjust the valve A so that the pickup lowers at a uniform rate of speed Lower time approx 1 sec Adjustment of diaphragm The diaphragm is adjusted by loosening the screw A and tum...

Page 17: ...ws D and turning ihe bearing holder B The vertical plane is adjusted by loosening screws E and turning the bearing F The need for relubrication is negligible In the case of overhauls and when replacin...

Page 18: ...approx 2 since the mains frequency deviates by approx 41 Hz at50 Hz 2 Stroboscope disc and straboscope lamp This check gives an accuracy corresponding to the tolerance of the stroboscope lamp usually...

Page 19: ...tivate Move slide towards center of the turntable When the slide is facing a trans parent field on the position marker stop it by depressing Connect vacnum tube volimeler to collector on 41C1 Adjust 1...

Page 20: ...more accurate range of variation the generator output should be loaded as shown in the sketch References are for left channel and bracketed references are for right channel NOTE Measuring instruments...

Page 21: ...mV at collector of 6TR6 6TR206 Set tone generator to deliver 400 Hz 23 1 mV Adjust 6R65 6R265 for 18 2 mv at collector of 6TR6 6TR206 ANRS Check Asinput and output points again use 6Tpl 6Tp201 and co...

Page 22: ...Set tone generator to deliver 400 Hz Connect tone generator to EXT MOD on baek of CD 4 generator Set tone generator outputand MOD LEVEL for 6 5 kHz max _ frequency swing on meter 0 15 kHz scale Short...

Page 23: ...ding to min in rear channels 2 Using a4 channel amplifier Switch off front channels Play test record JVC 4DE 205 with the MMC 6000 to be employed with the demodulator Adjust 6R6 6R206 for min sound in...

Page 24: ...tor control is E of 1TR2 8 5 Tacho circuit defective 1 03 Is of 1102 high Regulating circuit defective 1163 Does slide transport stop Rep BL 1TRS detector arm circuit _ is Cof1TAt high oe isBoftic2hig...

Page 25: ...lower pasition circuits BLS 1 TRS position TRE Does low pulse Rep lower control occurai C2h equipment Does C of 1TR14 ga Ren electranic high switch Rep magnet coil circuit Does servo Rep photo contre...

Page 26: ...s pickup arm Adjust or rep rn travel slawly 4756 4157 4030 13 Activate with pickup arm above a record Does pickup arm Rep manual raise lower i lower circuit A Activate Rep electronic Does pickup arm e...

Page 27: ...Bang Olufsen MECHANICAL PARTS LIST...

Page 28: ...piece 4002 5514 7 2013002 Serew2 9 6 5 DIN 7982 14 2038237 Screw AM3 x30 DIN 84 3452246 Back piece 6000 5515 2803004 Guide washer 1 2816085 9Spring 3452268 Back piece 4002 6000 without print 9 3412051...

Page 29: ...piece 4002 5514 7 2013002 Serew2 9 6 5 DIN 7982 14 2038237 Screw AM3 x30 DIN 84 3452246 Back piece 6000 5515 2803004 Guide washer 1 2816085 9Spring 3452268 Back piece 4002 6000 without print 9 3412051...

Page 30: ...62 3188627 Contaet pin FRR SIO0NS Spire ORIG HA AAR PHASE Chassis complete 4002 65 4140376 Chassis complete 6000 66 863300044 Housing without pin 16 pot Contact pin PC board Heat sink End piece Stick...

Page 31: ...Q Bang Olufs en oe 128 ra WE N S i i t a i l Hf B3 Ba 5 66 ae a3 50 31 32 en me as ai w CT a e ret 100 Me A ee nc 9 wi 1s 10g...

Page 32: ...218 220 22 783 222 223 rriy 1a4 185 1B6 187 25 226 227 188 Dk 228 190 mi 234 230 192 193 71 7 27 ame 235 1S 236 17 iss 237 238 233 240 20 241 waz 243 Tad 745 246 247 2B 207 749 208 380 B51 wo BEE 20a...

Page 33: ...er for cover 213 2993028 Spindle 241 2038206 3947421 Tape 224 3199049 Dial 242 3134123 2645025 Phair 215 39251139 Holder for dial 243 2038222 45 3917406 Slave arm 26 2HLSTNE Foeirg Gee Bee JDDG 166002...

Page 34: ...8109 Heat sink for transistor 8300229 Light diade 2365105 Valve for transistor 7400815 Microswitch 7210104 Socket 4 pol 7400115 Microswitch 7210103 SocketJpal 2816130 Leaf spring 7ZIN103 Sacket J pat...

Page 35: ...2 220 Ohm 5 1 84 R24 SHOW7 330 KOnms5 1 80 1R 6 5010049 100 KOhms 5 1 8 RI 010084 1 MOm 5 1 8 W Ro 5010049 J00 KOhimns 5 L aW AP SRIDDSI US KObms 5 1B 1A52 SPyO1IS IBXONms 5 178 RB O10057 15 MOhens 1...

Page 36: ...0V C31 4021025 Jn3F 10 100V 132 4201069 Qu2F 35V TANT 1033 4201087 1yF 35V TANT 1C34 4130103 100 nF 20 250 C35 4031025 JndF 10 tOaVv 1036 4201057 pF 35V TANT ERL1 7600007 aooseis PC3 3R1 5010059 10 KO...

Page 37: ...340084 110 SRD 212 8320266 33 TIP ai 8320285 20 8C183C 8320295 20 BO 337 25 E MEASURING CONDITIONS FOR DIAGRAM 1 SYMBOLS iTV f ov oly o ov ov All DC voltages are positive in proportion to chassis and...

Page 38: ...3K9Ohms5 1 8W 6R117 5010039 68 Ohms5 1 8W 6R28 228 SOIOi4L 27KOhnms5 1 8W GRII8 5010052 K8Ohms 5 1 8W 6R29 229 5010141 27 KOhmsS 1 8W 6R119 5010153 1K2O0hms 5 1 8 6R30 230 5010141 27KOhms5 1 8W 6RE2O...

Page 39: ...4 Furthermore 126 from base 1TR13 to chassis has been left out to secure that manual towering works at fast out transport of the pickup arm Because of tolerances in OPH1 1TR3 has been changed into a t...

Page 40: ...IOR 4440054 g34g026 33 TIP 120 8340054 19 MPS A13 6B1 201 6D103 eaopid2 AA143 801 8300042 OA 91 6DB 2068 8300142 AA143 DA 47 OA 47 BD2 B30005B 1N4148 60104 Jqgi3 1N 41448 SFO 184 ao100 ajqggzs ZPD 12V...

Page 41: ...tane 4 and 1 On rhe DIDGE LIST FOR TRANSISTOR AND IC 15ST BITRE B22D097 12 BC 547 8 FOR DIAGRAM z _ __18 BC 828 DIAGRAM 2 _ 18 pe 7378 BIC 1 BIC2 9340028 19 MPSA 12 18 Be 171 B adT 8300042 OA Di 19 TP...

Page 42: ...C 2378 1TA21 gg20152 18 8C 5578 18 BC171B 78 BC 2178 1Dia 8300028 ZPD 9 1 V 5 78 BC 3078 BZX 7831 iTR2 8320266 33 TIP at _ 18_ BC 2578 1014 1015 8300056 IN 4148 TETRA 93290285 18 Bc S54ac 47B22 1TR238...

Page 43: ...20 250 V O 47uE 35V TANT 100 nF 20 250 V 330 nF 20 100 V 20uF 25 V 2u2K 35 VTANT 100 nF 20 250 V 100 nF 20 250 V 220 nF 20 250 0 uF 35 VTANT 3n3F 10 100 V YF 35 IR50 ERSE ERS2 LRS3 1R54 1R55 1R56 R57...

Page 44: ...9 100 kohms 5 1 8 W 8R6 5010054 LtMohma 5 1 8 W BR18 5010048 4K7 ohms 5 1 8 W 8R7 4010045 47 kohms 5 1 8W SRG 5010059 10 kahms 5 1 8W SRS 4010054 Monms 5 1 8 W BRIO 3010049 100 kohms 5 1 8 W BRS SBH1O...

Page 45: ...Bang Olufsen MECHANICAL PARTS LIST ad t ow wo me n aT ELA ara A a me...

Page 46: ...34 3030007 Stop 35 3164190 Lid 2560839 Decorative list 36 2038055 Screw AM 3x 6 DIN 963 black 12 3458184 Toppiate 3946018 Plastic foil 13 3164142 Cover 3917022 Foam trang 14 2013088 Screw 2 9x 3 15 2...

Page 47: ...a xO 2 8 Bang Olufsen Thee eee LL 109 alts BA 46...

Page 48: ...3300044 Syrgen pins 7 2819096 Spine 7500076 Conict pin 68 3152329 Holder 36 2395034 Spire 69 2072701 Threaded DINM4Ix4 57 8055020 Chassis 4002 DIN 438 8655022 Chassis 4004 79 3452068 Halder 58 722005...

Page 49: ...2 9 9 5 DIM 7981 Clamp Serew 2 5 x 6 5 DIN 7982 Guide rail Screw 3 x 6 DIN 84 Cover Fuse 250 mA F 250 Labei for fuse 114 115 116 il 118 99 3131118 Housing for fuse 6600000 Fuse 250 mA F 250 7400062 M...

Page 50: ...9 10 Bang Olufsen...

Page 51: ...Circlip 192 3375026 Optics 235 2548109 Bracket 193 2853045 Am 236 2700008 Adjustment bushing 194 2810087 Spring 237 2834041 Shaft coliected 198 6819006 Magaet colt 238 2831025 Shaft 196 2850047 Press...

Page 52: ...B po 6 7210104 Setket4po 3 2216106 Socket 11 pol 7 210103 Spcket3pol 3558109 Aeat sink fos transistor 8 T2F01G3 Sockel3 pol _ 2622248 Mica sheef fortransistor 9 7210097 Sacket 10 pol 3172074 insulati...

Page 53: ...rtan contro 3391385 Top boltom inseri 7220163 Piug7pol 3397157 Lid insert 100012 Mains lead 3397158 Packing left 6270194 Chassis cable 3397159 Packing right 6273771 Lead set Pos 40 ST a7 1f4 140 14 14...

Page 54: ...process dhe remote control information in the Beo gram 4004 consist in principie of three blocks a start function a rise lower function and a stop function The cizevits receive two bits of informatio...

Page 55: ...I is charged to approx 6 volts When a change to anather program is made on the remote coniral unit the 3 volt potential at pin 4 ofPS disappears 8C3 will discharge through 8R5 and 8R7 causing 8TR1 to...

Page 56: ...will discharge such that a negative voltage appears at the cathade uf D4 804 and 4D receive forward bias and the STOP section of the electronic switch is activated the pick up arm rises and the slide...

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