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Clear-Com SB-704, Instruction Manual

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Clear-Com SB-704 Instruction Manual Download Page 33

S B - 7 0 4   M A I N   S T A T I O N

3 - 1

MAINTENANCE

INTRODUCTION

This chapter provides maintenance information, including a block diagram and troubleshooting tips. 

Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical 

shock, do not perform any servicing other than that contained in the operating instructions unless you 
are qualified to do so.

SB-704 BLOCK DIAGRAM

Summary of Contents for SB-704

Page 1: ...SB 704 MAIN STATION I N S T R U C T I O N M A N U A L CLEAR COM ENCORE...

Page 2: ...ering No part of this document may be reproduced in any form by any means without prior written authorization of Clear Com an HME Company Clear Com Offices are located in California USA Cambridge UK M...

Page 3: ...s 1 7 Hidden Adjustment Controls 1 8 Rear Panel Options 1 9 Intercom Line Termination 1 9 Short Circuit and Overload Conditions 1 9 Summary of Main Front Panel Keys Lights and Controls 1 10 INSTALLATI...

Page 4: ...10 Program Audio Feed to Announce Output Jumper 2 10 Power Source Selection for Switchable Intercom Lines 2 11 MAINTENANCE 3 1 Introduction 3 1 SB 704 Block Diagram 3 1 TECHNICAL SPECIFICATIONS 4 1 S...

Page 5: ...om the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When...

Page 6: ...reby compliance with the requirement of Electromagnetic Compatibility Directive 2004 108 EC and Low Voltage Directive 2006 95 EC This device complies with Part 15 of the FCC Rules Operation is subject...

Page 7: ...pply or main station connected to various single or multi channel remote stations such as beltpacks and loudspeaker stations Clear Com manufactures a wide variety of both portable and fixed installati...

Page 8: ...ocessor control REMOVABLE ACCESS PANEL A removable front panel allows access to most controls and option DIP switches INDIVIDUAL CHANNEL CONTROLS Each channel has individual talk listen and call push...

Page 9: ...ut upsetting the setting of talk switches REMOTE MIC KILL SWITCH Front panel switch allows you to turn off all latched talks on remote stations and beltpacks EXTERNAL MIC ON OFF INPUT An external logi...

Page 10: ...cess panel and remove it This section discusses the following subjects Intercom power status lights Selecting microphones and enabling the speaker Listening to intercom channels Monitoring main progra...

Page 11: ...green to indicate that the listen function is on The listen level control below the call button for that channel is usually set to full on position and the listening volume is set by the intercom volu...

Page 12: ...es are not reset but the microphone s audio does not go to the intercom line while the announce function is active A set of relay contacts are activated to control some external device There is an opt...

Page 13: ...ENTS This section describes the option DIP switches and various adjustment controls behind the access panel on the front panel These option switches and controls are usually set and not used in daily...

Page 14: ...lose Raising the gain from the factory setting should be done carefully as too much gain will increase the background noise in the intercom making it unusable CHANNEL NULL ADJUST The screwdriver adjus...

Page 15: ...must be disabled Note If the link function is to be used on an SB 704 and there is more than one main station in the system it can only be used on the unit that provides termination The terminations...

Page 16: ...either panel or headset Blue Off Latching only activates automatically when other keys such as Talk Announce All Talk are pressed Listen Key press to listen to a channel Green Off Latching only can be...

Page 17: ...l Key press to clear all latched talks on connected remote stations beltpacks on all channels Amber Off Momentary only Short Overload Light lights when there is a short or overload on the associated c...

Page 18: ...S B 7 0 4 M A I N S T A T I O N 1 1 2...

Page 19: ...com inputs must be terminated to keep the line drive circuits stable The SB 704 provides switchable terminations of the intercom lines Clear Com main stations and power supplies provide switch selecta...

Page 20: ...ROTECTION The SB 704 s internal power supply senses the difference between shorts and overloads If an overload is detected the power supply will shut down that channel An overload lasting a short peri...

Page 21: ...POWER SUPPLIES Multiple power supplies can be paralleled to increase system capacity The SB 704 s internal power supply will automatically detect the actions of other power supplies during overloads a...

Page 22: ...emote station that has not been equipped for power line isolation is connected those channels would now have their power lines connected The system will still work except that a short circuit on any o...

Page 23: ...uns longer than 500 ft 152 5 m use an 18 gauge cable Belden 8760 Placing the cable in conduit is recommended but not necessary Multi pair cable that is individually shielded is acceptable for use in m...

Page 24: ...I O N 2 6 Figure 2 4 Interconnect Cable Detail Note The remote stations connected to each channel are powered from the intercom cable for that channel In the case above a short on any one line will on...

Page 25: ...c hot Pin 3 Headphone common Pin 4 Headphone hot Note Do not tie pin 1 and pin 3 together PANEL MIC CONNECTOR FRONT PANEL Two plug in panel microphones are available for use on the SB 704 The GM 9 is...

Page 26: ...the intercom lines with the option DIP switches marked program select A D Another option is to feed program audio to the announce output This is selected by setting jumper J11 on the main board to th...

Page 27: ...ollows Tip Hot mic output Ring Control signal in Sleeve Ground EXTERNAL SPEAKER REAR PANEL 1 4 INCH PHONE JACK A in 0 64 cm phone jack marked external speaker provides the power amplifier output of th...

Page 28: ...ction has been activated with an option DIP switch and a talk is active on that channel Refer to the illustration for connection of the program inputs Pins 5 or 14 can be used for connecting shields R...

Page 29: ...n the channel on which the interrupt has been enabled the program will be interrupted for the duration of the talk REMOTE Call Signal Activated Jumper between pins 2 and 3 When a call is received on t...

Page 30: ...l B s power A jumper field in the middle upper portion of the rear panel printed wiring board has been provided for changing the power source of the switchable intercom lines To change the factory def...

Page 31: ...S B 7 0 4 M A I N S T A T I O N 2 1 3...

Page 32: ...S B 7 0 4 M A I N S T A T I O N 2 1 4...

Page 33: ...including a block diagram and troubleshooting tips Caution These servicing instructions are for use by qualified personnel only To reduce the risk of electrical shock do not perform any servicing othe...

Page 34: ...S B 7 0 4 M A I N S T A T I O N 3 2 Figure 3 8 SB 704 Block Diagram...

Page 35: ...c Limiter Threshold 0dBu 3dB Mic Limiter Range 15dB Program Line Input Maximum Level before Clipping 20dBu Input Impedance 5K Headset Output Load Impedance 8 Output Impedance 25 Output Limiter Thresho...

Page 36: ...Mic Party Line 0 5 Headset Mic Line Out 0 5 Program Input Party Line 0 2 Program Input Headset Out 0 2 Program Input Speaker Out 0 5 Party Line Headset Out 0 2 Party Line Speaker Out 0 5 Noise Panel M...

Page 37: ...ker stations or 12 headset stations distributed over all channels Rear Panel Connectors Switched Intercom 10 XLR 3M 1 per channel Intercom 4 XLR 3M 1 per channel Announce Out 1 XLR 3M audio Program In...

Page 38: ...itches 4 Talk latch disable DIP switches 4 Line length DIP switches 10 Channel Assignment Slide switches Environmental 32 122o F 0 50o C Dimensions 19 in W x 3 5 in H x 10 5 in D 483 mm x 88 mm x 267...

Page 39: ...ones and spare parts have a limited warranty of one year UHF wireless IFB products have a limited warranty of one year UHF wireless intercom systems have a limited warranty of three years All other Cl...

Page 40: ...warranty period has expired the User Support Center will continue to provide telephone support if you have purchased an Extended Warranty or Service Contract In these cases you will have access to tel...

Page 41: ...nty extensions on UHF wireless intercom systems or on any product with a 1 year or 90 day warranty SERVICE CONTRACT Clear Com also offers service contracts that provide 24 x 7 telephone support advanc...

Page 42: ...uctions in the manual defective or improperly associated equipment attempts at modification and repair not approved by Clear Com and shipping damage Products with their serial numbers removed or defac...

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