Crown OC-150A Скачать руководство пользователя страница 1

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Содержание OC-150A

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Страница 2: ...i s eliminaees the need a separately engage the range itchand insurea the meter needle wcrn8tPle accidently damaged The redram schemtic pargial enclosed illustrates t h e wiring changes There are no...

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Страница 4: ...orm as specified GROWN also warrants the components and workmanship of tl 8i sequipment to befree from defectsfara pesid af3 yearsfromdateaf purchase This warranty does not end to fuses andJarcom pane...

Страница 5: ...sact as B b U meters 8 METERS Meters calibrakd i dB 1 2 can be used 0monitoroutput signalievels eithgr in VU 01 PEAK Meter scales are calibratedindB and volt CAUf Never adjustthe mechanicaladjustscrew...

Страница 6: ...om Input 2 is depressed and to speaker seteclorswitch then to selected speaker syslen3 1 2 selectsthe amount sf Benuationdesired see page 6 for either headphone jack 1 2 Amp 2 Signa fed to t eters whe...

Страница 7: ...rmal operation If single channel operation is desired then strap X must be installed Additionally a similarstrap could beaddedto all inputs andthespeakt3rcablescouldbe reduced to 3 conductor eables An...

Страница 8: ...f the input linesto thervvaamplirfi em This hmk upapplmta CROWNamplaemon V u m u s t becertginof hawthe pounds ilrecannmtab famyoucannsctanyatkrarn Inthisconfigurntian MOTES FIG 1 4 Add ma conduetovju...

Страница 9: ...eereasing the load impedance too far For example by depress ing two speaker selector switches and a headphone sat at the same time the resultant impdame would be 27 ohms if all three were 8 ohm sys te...

Страница 10: ...FIG 1 5...

Страница 11: ...rpositi6n then carefully increa the volume for a csmfo table listening level Hww switch ts headphones white wearing heset The MAX psitian of the attenuator switch patches hesignal straight thraugh ts...

Страница 12: ...m his monitor switching does a a ect the prarngram to the speake but aged5 only whet the meters read With hemetering circuit of the OC 150A it is possible ta pedarm an objective evaluation of program...

Страница 13: ...e 5 8 s r other larger CROWN rack cabinets Ta prepare for such an iustallation firgt remsvetheburswket screwsretainingtheandbars 1 Align the angle brackets to tha unit and reie wfi the socket screws R...

Страница 14: ...han f8 5db over 20 minutes LEB aawd right speaker as damplifier grounds isalat d so that amplifiers with forwitfP k g isolated channel ground may be used safely Rear panel swikkes a ow 3levels of atte...

Страница 15: ...he OC 150A is essentially a mechanical As such it should greatly enhance the output evice designed with simplicity and precision flexibility of your hi fi system...

Страница 16: ...farm the readingbing an avemge If that wawefarm is a sine WVE the av8rage is zeqo sa the meter king en average reswnding meter reads zero We could try to use a dire AC reading again because sf mechsrn...

Страница 17: ...msnt are by passed Here how it works The waveform is sampiedefectronieaftyusing a sen sing circuit which measuqeseven the fastest peaks T is measurement isstored aleetr nically and then sesrtto he met...

Страница 18: ...tive pae of the immdancc This is es sentially wastc c powersinceif dmsnat produrn any acoustical r soit Resistance is found in such places a5 in the wir ofthe s a k r waice csit 2 Same af the po er is...

Страница 19: ...power is produced UP FIG 2 3 It should be clear that t b ideal laad in terms of producing aceustiea9 enerw would be one which minimize the reactive camwnant high amplifier efficiency while optimizingt...

Страница 20: ...ings an the QC 1SOA are chiefly usefut a a camparabive analysis tmf Ysu might try computing power lasing the oaminal rated impedance af the speaker system Ihshoanld be clear from the above discussion...

Страница 21: ...SO FOG 2 5 FIG 2 6...

Страница 22: ...tor circuifa The comparator main tains a negativeoutput a5 longas thetiming network charge is positive In the VU mode this charge is removed very quickly by discl rarging the netwsrrh tkmugh a resisBo...

Страница 23: ...d be dot te in the foflowing steps FIG 2 7 1 Removethetop cover o f the OC l50A Lmatethe four wires Tram the transformer going to a ter minal strip Left hand rear Gamer terminal strip is mounted an re...

Страница 24: ...icaf Rsgisfggllas 16K ohm 2 waQ 1 film 20K ahm 4watt 1 MF 10K ahm 4wag I film 41 2M ohm 54 waB 1 M f Za8Mohm wag 5 22K ohm 4wa 10 10ohm 3 4 waM 10 2M ohm 56 wa8 5 100K ohm waft 10 188Kohm 6438 5 2 2K...

Страница 25: ...Pushbbafi n switch csXlar 25K audio t a p r pot ccw 1 74Mohm M wag 1 fifm 392 ohm watt 1 film 113ahm w w a B 1 Film 49 9 ohm M wag 1 frtm Lamp sseket 25A 6 3V la66 bukb Light bracket assy PC switch m...

Страница 26: ...internal star lackwasher 2365 Used to mount hafd timeconf als CHASSIS ASSEMBLY OC 15QA chassis 4P3hslE d e switch 093steel eyelet HTA fuseholder MDL 1 88 fuse AGC 1J16AFuse 3 18 8 power card male Heyc...

Страница 27: ...Maunb over screw from barrier strips C I Mountedan 8J6AJ terminal strips eP Usedto mount 3503 Used to moarat 3503 I 2 Usedt omount barrier strips I Usedto mount banker strips 1 Usedta mount banri r s...

Страница 28: ...Early units R27 was 4 7K and R18 was 56M All capacitors in micro farads all resistors inohms unlessotherwise noted R28 is meter calibration Never attempt to adjust R23 the drift adjust unless a 4 digi...

Страница 29: ...ntacts b Switch handle not moving eorreetly t h o u g hi t s 3 posit ion range 5 a Faulty semiconductar device i n meter circuitry Q3 Q4 sc a 6 a Faulty component i n hold circuitry Ql IC l D C49 1 3...

Страница 30: ...ter to the output of IC 2 and ground a S e t meter switch to peak and turn hold timeM controls full clsckwise b Remove s i g n a l from the input c DVM reading should n o t vary 001 v over a 30 sec pe...

Страница 31: ...o n is attsmpted Then t h e manuel L n s t r u t t o n aon page 19 are v e r y m i a l a d f n g Tha sntfrs gruup Prom 5N q3QI t o 3650 350 uwfte was wired according t o drawing A enclosed Please care...

Страница 32: ...DRAWING B f 3L from SVGR Brans 811jCbE8 famw BL RED...

Страница 33: ...eading should hold at 120 V f o r 10 15 seconds Switch range switch t o 14 V t u r n hold time controls ta f u l l CCW and feed in a 10 V o l t s i g n a l t o Amp 1 1 1 input Use t h e output from an...

Страница 34: ...ear as en input o f f s e t 3 Step 3 i f 91 i s leaky the circuit will catch a peak but hold time will not Be adjustable 4 Step 4 5 if meters seem jumpy on low ranges check Q3 or 04 for noise These ar...

Страница 35: ...y A 100 o h 114 watt rssistor CPN 2872 is added between C3 and the emitter o f QS Tha enclosad board layout and schamptic illustrate the modification 93 and or 9 4 failure syrapta tsare several Typica...

Страница 36: ...Drill Hales Cut Trace Add 100 ohm ResiWor...

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