SoundCraft CPS250 User And Technical Manual Download Page 16 | Manualshive

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Circuit Diagram (1)

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Technical Description

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Summary of Contents for CPS250

Page 1: ...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: ...in hardware contained in the product No part of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic electrical mechanical optical chemical including photocopying and recording for any purpose without the express written permission of Soundcraft It is recommended that all maintenance and service on the product should be carried out by Sou...

Page 3: ...ns 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 13 Circuit Description 14 Servicing 17 PCB Layout 20 Output Pinouts 21 Parts List 23 i ...

Page 4: ...ii ...

Page 5: ...Introduction Introduction 1 ...

Page 6: ...issipation of which is achieved through a substantial internal heat sink A fan is incorporated which draws air over the heatsinks to provide adequate heat dissipation for the regulators and reduce the outer case temperature The CPS250 CPS275 is designed for installation in a 19 rack unit occupying 2U of rack height Refer to the section RECOMMENDATIONS FOR INSTALLATION on Page 5 LED indication is p...

Page 7: ...pply NOMINAL VOLTAGE OPERATING VOLTAGE RANGE 10 15 Vrms AC Vrms AC 230 196 253 115 98 126 100 85 110 85 73 93 To remove the fuse use a small screwdriver to prise the fuse carrier from its location in the connector To avoid risk of fire use the correct value fuse as indicated on the unit REPLACING MAINS FUSE Switch the ON OFF switch to the OFF position Remove the mains lead from the connector Use a...

Page 8: ...aler or Soundcraft and postage must be prepaid 4 This warranty shall only be available if a the Equipment has been properly installed in accordance with instructions contained in Soundcraft s manual and b the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing and c no persons other than authorised representatives of Soundcraft or the Dealer have effected any repl...

Page 9: ... your plug proceed as follows The wire which is coloured Green and Yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol The wire which is coloured Blue must be connected to the terminal in the plug which is marked with the letter N or coloured Black The wire which is coloured Brown must be connected to the terminal in the plug which is marke...

Page 10: ...us air flow Other equipment in the rack which is known NOT to produce a significant amount of heat should be mounted BELOW the unit Equipment that also relies on good air flow within the rack ie most power amplifiers and other power supplies should be given due consideration and some space should be provided between such units and between these and the CPS250 CPS275 unit Forced convection by means...

Page 11: ... operation in dusty locations and do not expose to corrosive atmospheres To avoid risk of fire do not expose this unit to rain or moisture Retain all packaging for transportation in the event of the unit requiring servicing Retain this manual safely along with all other relevant documents For touring mobile transportation it is advisable to install the CPS250 CPS275 in a flight case to provide mec...

Page 12: ...e Standby CPS275 Main CPS275 The output voltages from the CPS275 are fed via diodes as shown in the adjacent diagram This allows a standby CPS275 to automatically takeover in theevent of a power rail failing When a spare CPS275 is ordered it comes with a 1metre linking cable This should be connected between the link connectors as shown in the diagram 8 Installation ...

Page 13: ...Technical Specification Technical Specification 9 ...

Page 14: ...5 25 AMPS 5V 1 00 AMPS 1 00 AMPS 48V 0 30 AMPS 0 30 AMPS All voltage and current measurements are to be taken at the console end of the power supply cable OPERATING TEMPERATURE RANGE Ambient 10 TO 40 C HUMIDITY Similar unit tested at 0 90 RH non condensing 5 Relative Humidity at 40 C for 16 hours Load switched between 20 and 100 at regular 30 minute intervals OVERALL DIMENSIONS HEIGHT exc feet 88 ...

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: ...The 723 IC contains a 7 15V nominal Zener diode defining the voltage that appears at Pin 6 R5 is in series with the positive input of the servo opamp Pin 5 and is made roughly equal in resistance to the feedback divider R7 11 etc to minimise bias current offsets The feedback divider R7 8 11 PR1 derives a fraction of the output voltage and delivers it to the negative input of the servo opamp Pin 4 ...

Page 19: ...lapses there is no longer enough voltage to keep DZ1 DZ2 on and OP1 switches off TR5 is turned on by R16 with R28 30 and C40 providing a time delay to prevent spurious operation on transients or brief overloads which are dealt with by the constant current protection system TR5 now pulls down an internal node of IC1 via pin 13 and the 17V supply is shut down In the same way if the 17V supply fails ...

Page 20: ...d by D9 12 with C36 as the reservoir capacitor The LM340 regulator has a fixed 5 0V output C35 ensures regulator stability A protection diode is included D14 protects the regulator from reverse voltage if there is a charged capacitor across the output but the voltage on C36 has collapsed Diode D23 on the output CPS275 only allows supplies to be paralleled for redundancy 16 Technical Description ...

Page 21: ...nit ON and checking the voltages present on the output connectors on the back of the unit While the unit remains disconnected from the mixing console some of the DC voltage rails are floating with respect to each other that is they do not all have a common reference within the unit When connection is made to the mixing console various output pins become earthed to a common star point which has a m...

Page 22: ...carefully removed by hand Ensure that the insulating fuse covers are replaced with the new fuses Various components are mounted along the heatsink extrusion The extrusion pcb assembly must be removed from the case to gain access to the underside of the pcb in order to unsolder and or undo the appropriate component They can be removed by desoldering the pins where appropriate and unscrewing the fix...

Page 23: ...ors must be checked for isolation from the heatsink using a multimeter Re dress cable forms in their original positions and secure where applicable with cable ties OUTPUT VOLTAGE ADJUSTMENTS The 17V and 48V rails are adjustable via trimpots on the pcb After any repair these should be checked on load and adjusted if necessary Set the 17V rails to 17 5V 0 1V and the 48V rail to 48 3 0 1V The 5V rail...

Page 24: ...PCB Layout 20 Technical Description ...

Page 25: ...Output Pinouts Technical Description 21 ...

Page 26: ...22 Technical Description ...

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