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SoundCraft CPS275 manual

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Table of contents for the manual

  • Page 1

    SOUNDCRAFT CPS250 CPS275 Console Power Supply User and Technical Manual IMPORTANT: please read this manual carefully before connecting your Soundcraft console power supply to the mains for the first time. For your own safety and to avoid invalidation of the warranty all text marked with these Warning Symbols should be read carefully.[...]

  • Page 2

    © Harman International Industrie s Ltd. 1997 All rights reserved Parts of the design of this produc t may be prote c te d by worldwi de paten ts. Part No. ZM0195 Issue 3 Soundcraft is a tra ding divi sion of Harm a n In te rn at iona l Industrie s Ltd . Information in this manua l is subject to change withou t noti ce a nd doe s not represent a c [...]

  • Page 3

    Table of Contents Introduction 1 Introduction 2 Short-circuit Protection 2 Mains Voltage Selection 3 Replacing Mains Fuse 3 Warranty 4 Recommendations For Installation 5 Recommendations For Installation 6 General 7 Dimensions 8 PSU Linking (CPS275 Only) 8 Technical Specification 9 Technical Description 11 Circuit Diagram (1) 12 Circuit Diagram (2) [...]

  • Page 4

    ii[...]

  • Page 5

    Introduction Introduction 1[...]

  • Page 6

    Introduction WARNING: THIS APPARATUS MUST BE EARTHED The CPS250/CPS275 are linear power supplies which, like other linear supplie s, produce DC voltages by rectifyi ng, smoothing and re gulating AC voltage s from the secondary winding s of a mains transfo rmer. Soundcraft mixi ng consoles em ploy a number of dc volta ge supply levels in their opera[...]

  • Page 7

    MAINS VOLTAGE SELECTION Special attenti on sh ould be pai d to th e fo llowi ng infor matio n: Do not change the voltage setting without first turning the unit off and unplugging the mains lead. This unit is capa ble of operating over a range of mains voltag es by means of a 4-position mains input fuse c arrier. It is impo rtant to ensure that the [...]

  • Page 8

    1 Soundcraft is a trading division of Harman In te rn at iona l Industrie s Lt d. End User means the person who first puts th e e quip ment in to regu la r opera ti on. Dealer m eans the person other than Soundcraft (if any) from whom the End User purchased the Equip me nt, provid ed such a pe rs on is a utho ri se d fo r th is purpos e by Soundcra[...]

  • Page 9

    Recommendations For Installation FOR UK USERS ONL Y The wires in the mains lead are coloured in accordance with the following code: Green and Y ellow: Blue: Brown: Earth Neutral Live As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which [...]

  • Page 10

    Recommendations for Installation The CPS250/CPS275 power su pply is provide d wit h front p an el fix ing hol e s for 19" rack-mounting and will occupy 2U of rack space. As with any power supply that contains a large mains-voltage tran sformer, it is preferable t o provide a degre e of physical is olation of the unit from o ther electronic equ[...]

  • Page 11

    formed if this cha ssis and the p ower supply chassis a re in elec trical conta ct through the fixing rails they sha re in the rack. To avoid thi s situation, sta ndard isolating washers may be employed when fixing the power suppl y (or supplies) or any other unit into the rack. W A R N I N G : THIS APPARATUS MUST BE EARTHED. Under no circumstances[...]

  • Page 12

    88.10mm 9.52mm 5.95mm 5.95mm 350.50mm 427.56mm 482.60mm Dimensions PSU Linking (CPS275 Only) Con so le (O nly one ra il sh ow n. ) Lin k Con so le (O nly one ra il sh ow n. ) Lin k To C o n s o l e Stan d b y C PS275 Main CPS275 The output voltage s from the CPS275 a re fe d via diodes as shown in th e adjacent diagram. Th is allows a sta ndby CPS2[...]

  • Page 13

    Technical Specification Technical Specification 9[...]

  • Page 14

    Technical Specification MAINS INPUT VOLTAGE RANGE: 85/100/115/230 V AC +10%/-15% @ 50/60Hz RATED INPUT POWER (Max): CPS250 - 350 WATTS CPS275 - 450 WATTS MAINS FUSE RATING: Use T3.15A/250V (slow-blow) for 230V Use T6.3A/250V (slow-bl ow) for 85/100/11 5V OUTPUTS DC. VOLTAG E RAIL MAX. OUTPU T CURRENT CPS250 CPS275 +17.5V 4.00 AMPS 5.25 AMPS -17.5V [...]

  • Page 15

    Technical Description Servicing should only be carried out by a competent service engineer. SEE THE WARNINGS STARTING ON PAGE 17. Technical Description 11[...]

  • Page 16

    Circuit Diagram (1) 12 Technical Description[...]

  • Page 17

    Circuit Diagram (2) Technical Description 13[...]

  • Page 18

    Circuit Description The CPS250 and CPS275 power suppli es provide +/ -1 7V at 4 Amps an d 5 .25 Am ps respective ly . Bo th give +5 V at 1 Amp , a nd +48 V at 0. 3 Amp. The PCB is SC3803. THE +/- 17V RAILS. This consists of two ide ntical +17V supplie s connected toge ther to give +/-1 7V. Each 17V supply is a linear regulator with conventiona l fu[...]

  • Page 19

    The constan t-curren t pr otecti on sy stem w orks i n th e stand ard way; w hen an at tempt is made to draw excessi ve current, the out put vol tage is redu ced so that no mor e than a fixed maximum can be drawn. However, the high c urrent capability of th is PSU means that long-term co nstant-current protect ion al one is not pr acti cal a s the [...]

  • Page 20

    The +5V Supply. Max current rating 1.0 Amps . This supply is primarily i ntended for powering console internal computer s; it also powe r s the co oling fan. The AC input is fuse d by F4 and fullwave rectified by D9-12, with C36 as the reservoir capacitor. The LM340 re gulator has a fixed 5.0V out put. C35 ensures regulator stability. A protection [...]

  • Page 21

    Servicing SAFETY. These safety note s a re dire c te d to thos e te s ting and repairing this powe r supply. Legal requirements me an that we must not encourage untr ained personnel to take the lid off. Servicing should only be carried out by a competent service engineer. This supply contains mains voltages on the voltage select PCB, the ma ins swi[...]

  • Page 22

    FAULTFINDING NOTES. +/- 17V RAILS. If one side of the +/ -17V supply is not working, the mut ual shutdown syste m will close down both sid es of the supply. This mak es faultfinding difficult as it is often not obvious which side has fa iled. The mutua l shutdown can be disabled by linking pins 4 and 5 on BOTH opto-isolators IT IS ESSENT IAL THAT T[...]

  • Page 23

    Reassem bly is simply a reverse of the procedure a bove. Parti cular care should be taken when fixi ng the regulators, ensuring that the p ins are not ben t or the c ircuit board pads strained when the fixing screws are tighte ned. The regulator s crews are ta pped into a relativel y sof t al um in i u m heat si nk . DO NOT OVER-TIGHTEN or you will[...]

  • Page 24

    PCB Layout 20 Technical Description[...]

  • Page 25

    Output Pinouts Technical Description 21[...]

  • Page 26

    22 Technical Description[...]