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Crown OC-150A User Manual
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Crown OC-150A User Manual

Output control console
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Summary of Contents for Crown OC-150A

  • Page 2 ADDEmM SHEET BC-1SOA Starting with s e s f a l nmber feature in the fine moniLor swiechLng, swigches line voltage Ants meser 14QV* range T h i s range % % i t c h and insurea The r e d r a m schemtic pargial enclosed changes i n changes, There...
  • Page 4 ~ ~ company immediately* Only institute a claim with She carrier for shipment. However, CROWN will cooperate fully in such an event. sure to carton erf damage far inspeetian, setippgr" FIG,...

  • Page 5: Quick Summary

    QUICK SUMMARY The GrC-15QA is an GIUTPUT Ca3faaTFSBt CENTER. fier(~) and the speaker sys.$.em(s), The meters rgad in dB, ~i%.ser 2. Output one, two, three amplifiers 3. Up three spaker systems, in any combination, From three input headphone pcks and 2 are switch-selected and fed through the Details blow: HOLD...
  • Page 6 depressed, 3 -Amp when meters, is fed to when dep~essed, signal from ---Amp - - . meters, W 2 is fed depressed, signai --.Amp when is fed meters* E, RANGE SWOYCH 1,2,3,4,5-determine the sensitivity of the t e ~ , bath Full scale ranges...
  • Page 7 Any time another parallsled balanced! With strap X connected, you cannot use a balanced amplifier (such as CROWN amp operating in mono) into input #2. special hook-up diagram CONNECTIONS FOLDOUT. This hook-up provides speakers half power...
  • Page 8 MOTES: jumpers from tnput Add ma-conduetov fram one ampiifleu, ~ ~ f p u f S V - ~ F ? ~ CROWN MONO AMP HOOK-UP 1 l@ channel through the rvva @@und of the input lines to the amplirfi- CROWN amplaem on&!
  • Page 9 -0bsewe proper phasing of you are using a power amplifier CROWN, be very careful that you don't exceed the amplitlets power capabilities by load impedance too far. two speaker selector switches sat at same time, would be ohms, if all...
  • Page 10 FIG.
  • Page 11 Your OC-150A has many possible uses. The folfowing discussion can be u s d as guide Your own specific equipment as well as appticatians, your peawplai listening habits wit! d@Permine She 0@-15QA, SYSTEM SWltKCnlHE A, SPEAKERSJHUDPHBMES With a speaker system...
  • Page 12 ~ , but only aged5 meters read. circuit& of OC-150A pedarm objective evaluation of catch With unique peak can actually "'catch'bsjgnal m&cs sent the where s r ~ @quivaien"lvottag@s,...
  • Page 13 Angle supplied in the accessow bfies for" insta&la- a nylon washer CROWN "'rack"" damage iustallation, firgt FIG. unit to tha and reie?wfi the f w k cmrs threading but will str";raighterr...
  • Page 14 METER RESPONSE METER ACCURACY GROUNDING HEADPHONE JACKS SEMICONDUCTOR COMPLEMENT AC OUTLETS POWER REQUIREMENTS - 1 4 db fram 20 Hz ts 20 KHz; E n peak m d e eapabte of measuring (within 5%) a cycle single at TOKHz, scale, a d a f all ranges.
  • Page 15 OC-150A is a mechanical such output should greatly enhance the evice, designed with simplicity and precision. flexibility of your hi-fi system.
  • Page 16 IkNPUT/OUf SPECS Since it is a mechanicat (~~"stelhing) not alter the 150A d w r output fram an pr~ckse any way. The swikhing Is protect $ha assxiafed coo~rbe% to before-me eaurtputs from aeeidentsl ampiif ier tion, the amglifi~fr i ~ p u k hawe analgctricai Imk~ut to against paralleling*...
  • Page 17 only relative voltage readings, and For accurate pawr meaningless an observation: This hefps to make input Unless the a 5teady reading farget bout taking a and deciding ~ w e r your how much autpbot ampiifier This abbemation aSss applies ta VU meters (and so-called reading VU met~rs since wcke peak...
  • Page 18 net resu impedance this Thhe csmplex current voltage waveforms to be out of some Bess than angie 9@, %e figure 2-2. $300 1800 270-600 (B) Current pure wavefg~~m with is?ductiv@ reac- tance. Current lags voltage by 90% (C) Current wavefaam with camplex im- pedance, cowbi nation af inductive...
  • Page 19 $4) %me last power is inefficiencies in the Interaction doudspeaker, of the voice magnetic field causes heating af n k i sheat magnetic care. wasted, producing no acokastica t effect, can be seen fram this, that smaif of the 12-5 p a W P i a n WBBS transiated into...
  • Page 20 frequency for smadsthing out the effect of pedance, instance, careful ker enclosure it wssi ble to smooth variations wide in impdance, pedance still not linear frequency. Many with a&ect mpedanse, variables such characteristics. resonance C ~ Q S S O Y ~ ~ lead Qpe of impedance curve it- sther factors...
  • Page 21 FOG, 2-5 FIG.
  • Page 22 She resulting regulated supplies volts. The uniqueness of the OC-150A metering system is that the information fed to mebevs is derived. Peaks are held at...

  • Page 23: Warranty & Service

    - ~ p s terminal 1 , unit should be taken to able HE will be CROWN personnel. In btar=k/green ble, call or write CROWN International, Mishawaka Rd., Elkhart, IN '"' will municatlon A fuse' merit, and 224% VAC.
  • Page 24 OC-JSQA PARTS LLST, Pa@@ 31 DeccrlptPon BOARD OC-256A METER itom Capac 470 P f mica lOOV . 4 m F paly, -6347 200V filmatik: mylar mylar ME 1BOV filma"rie: MF 3SV vedicaf isfggllas 16K ohm 2 film ?4 watt 10K ahm ?4 film 41.2M Za8M...
  • Page 25 Dasealptica~r awes IN4348 Zener IN961 I O V N4GQ3 ntegrat~d Cireui& HA-4741-5 quad op-amp 1F3568-4 FEhop-amp Mlsc~llanaug Blank PC board receptectes OIL IC socket IC sscket Meatsink Teflon pres~-fit termina is 6.32 hex spacer 5-32 x screw !A" internal r b r ~ 6 5 h e r FWQMT PAMEL ASSEMBLY OC-ISQA ?ran.$ panel...

  • Page 26: Chassis Assembly

    46-P-3% poNer hex spacer 6-32 6-32 %'"W internal W 8 isotder 2-G-f terminal strip -G-2 insulator OC-X50A PARTS L18T, Pdstge 3 Crown 9577 W P B a N SMT screw 3898 screw 3322 star washers 1823 1884 3587 Hi-D 4109...

  • Page 27: Accessory Pack

    taminas 8J683 160 ohm 10 R41, R4Zp R43, W44p R45, R46$ R47, R M 6-32 x %" BBHP #8 ",&e~nal star loekwarker 8-32 hex uut5 34" rubber feet #@-I8 1" mntro! knobs 4-40 $6' ' SSEY >g Panel wgsher #8 x 3/8" f i OC-l$Oli?a top coves $"...
  • Page 28 LIGHTS 8VAC NOTES: Schematic MI-263 applies only to PC board #9606 Starts SN 1301 Early units R27 was 4.7K and R 1 8 was 56M. All capacitors in micro-farads, all resistors in ohms unlessotherwise O C - I 50A noted. METER AMPLIFIER R28 is meter calibration.
  • Page 29 Unit doesn't t u r n on i n d i c a t e d by meteys l i g h t ] , pilot 2 . Braken, cracked meter, function Internittent b u t t o a s I n t e r n i t t e n t &@adphone attenuator s l i d e switch,...
  • Page 30 CAUTION: Bewarc o i h i g h t e s t i n g t h i s OC-25BA Y e s t S e k - U p Visually inspect the u n i t for b r i d g e s and cracked sr solder a l l switches f o r p r o p e r...
  • Page 31 CROWN $ 0 : a u t h a r f z e d s e ~ v i c e c ~ n t e r s OC-%SO& AG w i p i n g uBfacelift,R S t a r t i n g w i t h f r o n t panel.
  • Page 32 DRAWING from S V G R Brans- 811jCbE8, famw BL/RED...
  • Page 33 I n p u t a f f s e t panel meters, u n i t , Apply power w i t h Calibration ApplZy 1 2 6 3 t o h p t r u e rms peak {Use equivalent AC meter c a l i b r a t i n g...
  • Page 34 failures will 1. Most be due t o step read meters d o n ' t open, a turn--on S t e p 3 l e a k y , t h e circuit a d j u s t a b l e , Step meters seem jumpy on low ranges, check a r e...
  • Page 35 SERVICE SERVICE CENmRS 0C-158 MET= CZRCUIT Widespread failure the metering circuits in the OC-150 has been traced secondary breakdown of chargo tho t i m i n g r a q u i r d to prevent secondary breakdown and inrpmve religbility. o h , 114 watt rssistor...
  • Page 36 Drill Hales Trace ResiWor 100 ohm...