Bosch EVF-1181S
Contents
1. Access Card for Plug In Ey Loudspeaker Diagnostics User Instructions The Access Card is a unique feature of the EV Innovation series loudspeaker families This simple plug in device allows diagnostic access to the transducers and protection circuitry inside the enclosure WITHOUT requiring any disassembly or disconnections beyond simple removal and replacement of the plug in switch card DCR values described in these instruc tions are typical for EV I series two way systems eg EVF 1122S 64 For complete model specific DCR values consult the chart on page 4 Tools Required 1 2 Phillips Screwdriver 2 Ohm Meter capable of accurate measurements below 50 ohms Instructions 1 If applicable remove screws holding the security cover gland nut cover or NL4 cover in place Note position of the switch card The card must be replaced in exactly the same position as it was originally or system performance will be adversely affected 2 Carefully remove the switch card and set it aside Plug the Access Card onto the header in place of the switch card Note that the Access Card unlike the switch card will only fit in one position centered on the input cup See Figure 1 3 Turn on the Ohm Meter and set it to the low ohms x1 scale Short the two probes togeth er and calibrate the meter to Zero See Figure 2 If your meter does not have this calibra tion feature note the ohms reading This is the residual inter2. LACK com mon test point on the Access Card A properly functioning compression driver pair will read approximately 41 6 ohms DCR 1 ohm See Figure 7a A significantly higher reading indicates one of the compression drivers has an open voice coil meaning the compres sion driver s must be replaced A significantly lower reading indicates one or both of the compression driver voice coils are shorting meaning the compression driver s must be replaced Test the lower compression driver pair by repeating the above test with the meter connected to the LOWER YELLOW test point See Figure 7b x1 f x1 f x1 A Figure 6 Figure 7a Figure 7b EVA Woofer Pair Test EVA Upper Compression EVA Lower Compression Driver Pair Test Driver Pair Test 3 Test the PTP Power Tracking Protection networks Test the PTP network for the UPPER compression driver pair by placing one test lead securely on the UPPER GREEN test point and the other on the BLACK common test point on the Access Card A properly function ing PTP will read no more than 46 ohms See Figure 8a If the reading is higher replace the SK 3 lamps on the crossover PCB To test the PTP network for the LOWER compres sion driver pair repeat the above test using the LOWER GREEN test point See Figure 8b 4 Unplug the Access Card and re install the HF sh
3. W test points on the Access Card A properly functioning compression driver will read approxi mately 4 3 ohms DCR 0 5 ohm See Figure 4 A significantly higher reading indicates an open voice coil meaning the compression driver must be replaced A significantly lower reading indicates a voice coil that is shorting meaning the compression driver must be re placed 3 Test the PTP Power Tracking Protection network Place one test lead securely on each of the GREEN test points on the Access Card A properly functioning PTP will read no more than 2 ohms See Figure 5 If the reading is higher replace the SK 3 lamps on the cross over PCB 4 Unplug the Access Card and re install the switch card in exactly the same position it was in originally If applicable Re attach the security cover gland nut cover or NL4 cover Note EVF low frequency systems have no PTP or compression drivers and use different woof ers See the chart on page 4 for correct DCR values 2 WAY 2 WAY EVF EVH EVF EVH LF 2 WAY EVF EVH HE e ee TP 50 Ohms x1M O n Zero Set x1K a x1 Figure 3 EVF EVH Woofer Test A341 Ohms x1M O D Zero Set x1K a x1 Figure 4 EVF EVH Compression Driver Test Figure 5 EVF EVH Protection Network Test For EVA passive full range systems Use only the test points on the BLACK side of the Acc
4. ading switch card in exactly the same posi tion it was in originally If applicable re attach the security cover gland nut cover or NL4 cover ennn Test Test EVA Series Input Panel o o x1 y x1 f Figure 8a Figure 8b Figure 9 EVA Upper Protection EVA Lower Protection EVA Direct Access for Network Test Network Test Transducer Pairs Series WT G Woofers DCR Value Compression Drivers DCR Value a o o a aor wom 050 None Po evrtisis 1 15 381mm 542050 None EVF 1121S 1 12 305mm 3 8 0 50 N A ig N A PTP Network DCR Value Yes es lt 2 00 Yi El t Vi H U S A and Canada only For customer orders contact Customer Service at ec ro O I ce 800 392 3497 Fax 800 955 6831 Europe Africa and Middle East only For customer orders contact Customer Service at 12000 Portland Avenue South Burnsville MN 55337 49 9421 706 0 Fax 49 9421 706 265 Phone 952 884 4051 Fax 952 884 0043 Other Internatonal locations For customer orders Contact Customer Service at 1952 884 4051 Fax 1 952 887 9212 www electrovoice com For warranty repair or service information contact the Service Repair department at Bosch Communications Systems 04 2011 800 685 2606 Part Number F01U196280 Rev 2 For technical assistance contac
5. ess Card Note the position of the HF shading switch card The card must be replaced in exactly the same position as it was originally or system performance will be adversely affected EVA components are wired in pairs Therefore both woofers will be tested together at the same time as will the upper HF compression driver pair and the lower HF compression driver pair Each HF compression driver pair has its own PTP network and these are also tested separately EVA DCR values are referenced to the black common test point See Figure 6 To directly access transducer pairs for more sophisticated testing substitute the input con nection on the input terminal block for the black common test point on the access card See Figure 9 Note DCR values listed are not valid for this connection 1 Test the woofers Place one test lead securely on the RED test point and the other on the BLACK common test point on the Access Card A properly functioning woofer pair will read approximately 43 2 ohms DCR 1 ohm See Figure 6 A significantly higher reading indicates one of the woofers has an open voice coil meaning the woofer needs to be re placed A significantly lower reading indicates one or both of the woofers has a voice coil that is shorting meaning the woofer s must be replaced 2 Test the compression driver pairs Test the upper compression driver pair by placing one test lead securely on the UPPER YELLOW test point and the other on the B
6. nal resistance of the meter probes and test leads You will need to DEDUCT this number from the results you measure at the Access Card Figure 1 Figure 2 Switch Card Removal Access Card Install Ohm Meter Calibration IMPORTANT You are testing for DC resistance DCR DO NOT CONFUSE DCR WITH IMPEDANCE Simple DCR measurements will identify most common failures Experienced technicians may perform more sophisticated tests by connecting specialized test gear in place of the ohm meter IMPORTANT Never connect an amplifier to a PTP test point WARNING Compression drivers are easily destroyed by improper testing Never connect a battery or other power source directly to a compression driver Any testing beyond the DCR measurements outlined here is conducted at your own risk Drivers destroyed by improper testing are not covered under warranty For EVF and EVH 2 way systems Use only the test points on the GREEN side of the Access Card 1 Test the woofer Place one test lead securely on each of the RED test points on the Access Card A properly functioning woofer will read approximately 5 0 ohms DCR 0 5 ohm See Figure 3 A significantly higher reading indicates an open voice coil meaning the woofer must be replaced A significantly lower reading indicates a voice coil that is shorting mean ing the woofer must be replaced 2 Test the compression driver Place one test lead securely on each of the YELLO
7. t Technical Support at 866 78AUDIO Specifications subject to change without notice
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