The usercanselectoneof two modes:

1. MIC

In this modethe "ConferetteC 2-)" operatespurelyasanaudloamplifler.The infrared receiversectionisswifched off.
2. IR + MIC
In thls mode,audiosignalscanbe receivedas weilasthe infrared signals.

Thisdescriptlonhascoveredthe basicfunctlonlngof the unit Thefollowingrelatesto operatingthe unit:

The User'sGuideis subdividedintotwo sectlons.Thefirst

sectiondescnbesadjustments whichare onlyto be made by hearing-aidspecialists.Thesecondsectlon

contalnsthe adjustmentsrequiredto operatethe unit

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Microphoneactivationthresholdtor intra red mode

Exworksthe basicadjustmentISsuchthat the automatlc actlvatloncircuit respondsto the soundpressurepradu- ced bya personspeaklngat a normalspeechlevel,and at a dlstanceof approximately) m from the listener.The respondthresholdof the automaticcircurt,with respect to distance,can be variedwithinlimitsby meansof PE.

Adjustment ot compensation circuit

The "ConferetteC 2-)" containsa compensatloncircuit whIchpreventsthe voiceof the personweanngthe C 2-) from beingampllfiedat a unnaturallyhighvolume.The degreeof compensationmaybe adJustedwith potentio- meterPU(fig.2) accordingto the mainapplicatlon.

Adjustment: Potentiometerfully anticlockwise: for applicationashearingamplifier. Potentiometerfully clockwise:

if C 2-) is exclusivelyusedfor hearingand speechpractice.
A. Basic adjustment
Disassembly

Pullthe rearpart of the caseto the rear,awayfrom the unit Notoolsare requiredfor this operation,becausethe frant andrear partsof the caseare only Interconnected by a snap-flt.

Balanceadjustment

Withthis adjustment,the volumerelationshipbetween the two earphonesis adaptedto the reducedhearing capabilityof the user,whIchISnot usuallythe samefor both ears.Thecontral isdesignatedPBin Fig-2. The settingrangeis::t 30 dB-

PUPE PB Flg.2

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B. Operating the unit

1.Insertthe rechargeablebatteryplug@Intothe unit Observethe Instructlonsfor useon the red label.

2.Selectthe modewith switch(iJ"0" position:unitis

switchedoff. "MIC"position:microphonesswitchedon, infrared receiversectionswitchedoff. "IR+ MIC" position:infrared receiversectionisswitchedon and mlcrophonesare switchedon viathresholdsetting.

3.Placethe earpiecesinthe earsas shownIn Fig.l.

4.AdjustcontralCDfor the desIredvalue.If only hissing noiseis heardwhenthe Infraredmodehasbeenselec-

ted ("IR+ MIC"),the infraredtransmitteris not yet in operation.

5.Forinfrared reception("IR+ MIC")lens@)mustpoint in the directionof the infraredtransmitter.Wearthe

unit in sucha way that the lensISalwaysdirected towardsthe transmitter,i.e.the televisionset,andso that It isnot coveredbyyour handor clothing.

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