Service Manual EC1 Body-Pack Transmitter - Wiki Karat
Contents
1. P201 TP4 R220 C234 025368 rp U203 C245 S EI Wire for DC e voltmeter Ta N s JRI Ee EXPRESSES TP3 R206 m 0218 CX S CN Cv c N 3 2 0241 amp S a 2 c K 0204 S m o R209 gt Tp7 259 240 amp S a R215 N A treq 212 R219 TPS o NN S S le um i211 NE 0202 EE fere S g ISI S Jumpers 210 E e s p C202 4 5 SIS Te C23B e E N nnaman me N freq X201 jumpers jumper Figure 6 EC1 RF Board Bottom 2541002 RA 19 Replacement Parts and Drawings EC1 Body Pack Transmitter Cr s BRE E E Ss Q401 E e art TA 2 E E EIER es 64 184 5 S pae P405 ro a 2m 43 5S8 kN KONE F eae EA je ee lt ie H x zs SL x P401 ae gt C405 pa495 e 4 Eu C R407 104030401 i Figure 7 EC1 VCO Board Top apo O CN WY U C CN N Ge n AJ i co cA H o J ia S3 Ho E3 af C30 d CN Figure 8 EC1 Micropho2. SHURE EC1 Body Pack Transmitter Characteristics General 2 23 de A9 This transmitter is a single channel unit that operates in the VHF band between 169 445 and 230 000 MHz Its phase locked loop pll circuit is programmable enabling a factory authorized technician to change the transmitter s carrier frequency The unit is approved by the European Telecommunications Standards Institute ETSI and other authorities and is sold in Europe and many other parts of the world The EC1 is typically used with the Shure EC4 diversity receiver and a lavalier WL93 WL183 WL184 WL185 headset WH10 WCM16 or in strument WM98 microphone ON E SHURE 5 O A9 a L Jem Figure 1 Input jack Audio level control Power LED 1 2 Frequency label 3 Microphone on off switch 4 5 Power on off switch Belt clip Antenna fo po E UO Battery compartment Service Note Shure recommends that all service procedures be performed by a factory authorized service center or that the product be returned directly to Shure Brothers Inc 91998 Shure Brothers Inc Printed in U S A 25A1002 RA EC1 Body Pack Transmitter Circuit Description Audio Section RF Section The Shure EC1 transmitter has two interconnected circuit boards which comprise the audio and rf sections respe
3. R136 R133 R129 L103 S C126 R134 i 5 R121 2 o m 2 c C102 C101 Ds R105 R107 C106 a o C124 w R112 C112 C122 C116 R128 R115 Figure 3 EC1 Audio Board Top o Ee amp Qi06 Es Q105 1 qug e E R13 C104 ao C115 R103 C125 R135 amp C118 C10 U106 R120 i ge 2s 3 Ale E E F2 is 3 C105 S sl B slm S a r a Z RIO RII E 2 8 Tra e e vior 3 a 5 5m E Imm 5S Figure 4 EC1 Audio Board Bottom Replacement Parts and Drawings 18 25A1002 RA EC1 Body Pack Transmitter Spectrum Analyzer or R225 Frequency Counter R204 6255 C2014 S Sy c rj y Es Ee Y201 Shield Conductor C243 A201 v 8 U201 D C226 oo C227 EN ce Figure 5 EC1 RF Board Top
4. insert the bly proper letter code from the Group column in table 1 page 7 e g 90085974A C227 C228 Trim capacitor 3 10 pF 152C02 C243 Trim capacitor 7 50 pF 152H02 P201 P202 Interconnect strip 56A8042 Q201 Transistor NPN 183A03 MMBTH10L Q204 Transistor NPN 183A17 NE73433 R204 Potentiometer 5 k 2596 146D02 U201 Integrated circuit synthesizer 188A16 MC145152FN2 U202 Integrated circuit prescaler 188A15 MB504L U203 Single operational amplifier 188A14 MC33171D Y201 Crystal 6 4 MHz 140A002 Replacement Parts and Drawings 16 25A1002 RA EC1 Body Pack Transmitter Reference Designation Description Shure Part No commercial alternative Voltage Controlled Oscillator Board mounted inside the shield on the rf board Q401 Transistor vhf uhf N channel 183A18 MMBFJ310L Q402 Transistor dual gate agc amp 183B12 NE25139 U72 GaAs MESFET gallium arsenide metal oxide semiconductor field ef fect transistor 2541002 RA 17 Replacement Parts and Drawings EC1 Body Pack Transmitter J101 L102 101 D101 102 5 JAR
5. that should not be jumpered Complete these connections before tuning the transmit ter You will also need to change the frequency of the matching EC4 re ceiver to match the new transmitter frequency see the EC4 service manual Important Remove any unwanted solder bridging between jumpers 2541002 RA 7 Replacement Parts and Drawings EC1 Body Pack Transmitter Pc Board Groups Table 2 Zo A lt o R4 a a lt CN o a lt oO s amp 4 e az Nn L gz O a Sz T oo Sz DO 2 e wu gz gz e Sz oN ox rs 2 3 o A o A 169 445 V 0 AD 169 505 170 245 170 305 171 045 171 105 171 845 171 905 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AC AH AB AG W AA 173 800 AQ EA AY 173 800 174 100 0 EB CB 174 100 174 400 174 500 174 500 174 500 174 800 174 800 175 000 175 000 175 600 176 000 176 200 176 400 177 000 177 250 177 600 177 800 178 350 180 400 0 AZ DA EC BA 0 ED EE BB FA FB CA EF K DB CC 0 0 FC FD CD DC CE 181 500 182 200 183 250 183 600 184 050 184 800 186 100 DD CF FE FF 0 FG CG CH 186 200 186 600 189 000 CJ 25A10
6. 02 RA Replacement Parts and Drawings EC1 Body Pack Transmitter Freq 1208 1207 1206 1205 1204 1203 1202 1201 1213 1212 1211 1210 1209 Group MHZ Model N Ne N N NS No N No A As A A Ao B 190 600 CK 0 1 1 1 0 1 1 1 0 0 1 0 0 B 191 900 EG 0 1 1 1 0 1 1 1 1 1 1 1 0 B 192 200 CL 0 1 1 1 1 0 0 0 0 0 1 0 0 B 192 600 CM 0 1 1 1 1 0 0 0 0 1 1 0 0 B 195 000 CN 0 1 1 1 1 0 0 1 1 1 1 0 0 B 196 600 CP 0 1 1 1 1 0 1 0 1 1 1 0 0 B 198 250 DE 0 1 1 1 1 0 1 1 1 1 1 0 1 B 199 500 DF 0 1 1 1 1 1 0 0 1 0 1 1 0 B 200 300 CS 0 1 1 1 1 1 0 1 0 0 1 1 0 B 200 900 CZ 0 1 1 1 1 1 0 1 1 0 0 1 0 B 202 200 CQ 0 1 1 1 1 1 1 0 0 1 1 0 0 B 203 000 CR 0 1 1 1 1 1 1 0 1 1 1 0 0 B 203 500 DG 0 1 1 1 1 1 1 1 0 0 1 1 0 B 206 000 CT 1 0 0 0 0 0 0 0 1 0 0 0 0 B 208 200 CV 1 0 0 0 0 0 1 0 0 0 1 0 0 B 208 300 EH 1 0 0 0 0 0 1 0 0 0 1 1 0 B 209 000 CU 1 0 0 0 0 0 1 0 1 0 1 0 0 C 210 750 DJ 1 0 0 0 0 0 1 1 1 0 1 1 1 C 213 000 DK 1 0 0 0 0 1 0 1 0 0 1 0 0 C 216 100 EJ 1 0 0 0 0 1 1 1 0 0 0 1 0 C 216 750 DL 1 0 0 0 0 1 1 1 0 1 1 1 1 C 221 250 DM 1 0 0 0 1 0 1 0 0 1 0 0 1 C 222 250 DN 1 0 0 0 1 0 1 0 1 1 1 0 1 C 227 000 DP 1 0 0 0 1 1 0 1 1 1 1 0 0 C 229 000 DR 1 0 0 0 1 1 1 1 0 0 1 0 0 25A1002 RA Replacement Parts and Drawings These models have jumper X201 see Figure 6 page 19 power output which is part of the special requirements for these MPT1345 frequen cies co
7. 03 to provide a dc control voltage for the vco This voltage is fed back to varactor diode D402 in the vco assembly The factory adjusts trimmer capacitor C409 to center the vco frequency within the lock range RF Output Power Amplifier In the signal path transistor Q201 operates as an emitter follower to provide impedance matching The output of this stage is coupled via C221 to the final output stage Q204 which operates as a tuned amplifier The output of Q204 contains a four pole tuned circuit L205 C228 C226 L208 and C227 Output Filter and Antenna A dual pi section low pass filter C229 L206 C230 L207 C246 C247 and L209 further reduces any harmonic energy that remains The 50 Q filter output is connected to the antenna a quarter wavelength permanently attached flexible wire The pcb ground serves as a counterpoise Transmitter Output The transmitter can deliver up to 17 dBm 50 mW to the antenna No user adjustments permit this value to be ex 3 Replacement Parts and Drawings EC1 Body Pack Transmitter ceeded The unit is intended to be powered exclusively by a 9 Vdc bat tery an alkaline type such as a Duracell MN1604 is recommended Spurious Emissions To minimize the production and radiation of spurious emissions and harmonic energy and to promote stable opera tion the collector circuit of each rf stage is separately decoupled from the nine volt supply by ferrite chokes and bypass capacitors The b
8. ase cir cuits which are all operated from the regulated five volt supply are simi larly decoupled except that they use resistor capacitor RC networks which are more appropriate for the higher impedance level Replacement Parts and Drawings 4 25A1002 RA EC1 Body Pack Transmitter Functional Test Before disassembling the unit operate it to determine whether it is functioning normally Review the customer s complaint and focus your tests on it See the product User s Guide for a description of the unit as well as information on its operation troubleshooting and technical data Disassembly and Assembly To access the pc boards disassemble the unit A CAUTION Observe precautions when handling this static sensitive device Disassembly 1 Slide open the battery compartment cover and remove the bat tery and if necessary the serial number and date code labels 2 Remove the two smaller head Phillips screws from the back of the case it is not necessary to remove the belt clip 3 Carefully separate the top and bottom halves of the case to ex pose the pc boards 4 Grasp the edges of the pc boards as well as the front control panel and remove them as a unit by gently lifting them up and out of the case 5 Remove the rubber grommets from between the pc boards WS EN Figure 2 2541002 RA 5 Replacement Parts and Drawings EC1 Body Pack Transmitter Reassembly Place the
9. cond chan nel U101B supplies regulated low noise 5 Vdc bias to various audio and rf circuit points Transistor Q104 provides input bias for the com pander section U101A and transistor Q105 drives LED D101 which serves as a Power On and low battery indicator Transistor Q106 pro vides electronic reverse polarity protection Output and Mute The processed audio signal enters unity gain in verting amplifier U106A whose output feeds the rf printed circuit board through connector J101 The Mute switch 8102 controls the audio sig nal for standby operation without shutting off the carrier Audio Input Processed audio enters R204 an internal potentiome ter that is factory adjusted for 15 kHz deviation 10096 modulation when the audio section provides a 0 dBu 0 775 V 1 kHz tone Voltage Controlled Oscillator VCO Assembly This assembly is represented as A201 on the rf schematic its cir cuitry is detailed in the separate vco schematic Replacement Parts and Drawings 2 25A1002 RA 25A1002 RA EC1 Body Pack Transmitter Oscillation The signal from R204 enters the audio input of voltage controlled oscillator vco assembly A201 This feeds the signal to varac tor diode D401 which is part of a common gate Colpitts oscillator Q401 This vco stage operates directly at the carrier frequency Filtering and Frequency Stability The oscillator output is coupled by C410 to Q402 a GaAs MESFET gallium arsenide me
10. ctively plus a small audio filter board mounted directly to the input connector Input Audio signals enter the EC1 by way of a four pin miniature Tini Q G quick ground audio connector e Pin 1 Ground e Pin 2 Regulated 5 Vdc bias for electret condenser microphones e Pin 3 Audio input e Pin 4 20 KQ load resistor connected to pin 3 for Shure electret microphones The rf filtering networks on pins 2 and 3 prevent the radiation of spu rious signals via the audio input cable and prevent strong rf fields from disrupting the preamplification and bias voltage circuits Preamp The audio signal next enters a preamplifier transistors Q101 and Q102 An externally accessible variable gain control R115 provides up to 40 dB of gain enabling the user to compensate for level differences at the source Low pass filtering restricts the bandwidth of the system to audio frequencies Pre emphasis Network and Compander The amplified audio sig nal then passes through a 62 microsecond pre emphasis network C105 C106 R105 and R107 The output is fed to an NE571D compander U101A which uses an external buffer transistor Q103 to improve the signal to noise ratio The compander performs 2 1 logarithmic compres sion of the audio signal to effectively limit the peak deviation and spectral bandwidth of the transmitted signal An internal potentiometer R131 nulls the system audio distortion 5 Vdc Bias and Power LED The NE571D s identical se
11. eference Material Refer to the Service Equipment Manual for Shure standard test equipment Special Equipment The Service Equipment Manual covers the standard items needed for servicing the transmitters It also explains how to modify and use an SC4 receiver for testing any vhf microphone transmitter at the standard if frequency If you do not have this receiver you will need an appropriate receiver usually an EC4 set to the same frequency as the transmitter System Operating Frequencies Each rf board is marked with a group letter A B or C that identifies the range of frequencies on which the transmitter can operate The letter is scratched into the underside of the rf board near the part number for the bare unpopulated board Table 1 Rf Board Groups Group Frequency Range A 169 000 190 000 MHz B 190 050 210 000 MHz C 210 050 230 000 MHz Used with pcb assembly 90 8596A pcb marking 34A8476C Table 2 page 8 lists the frequencies and frequency codes avail able on the EC1 plus the rf board group number needed to provide each frequency Changing the Frequency The transmitter operating frequency is set by soldering jumpers across the appropriate solder pads on the back of the EC1 rf board as shown in Figure 6 page 19 Table 2 identifies the solder pads used for each frequency Each location that requires a solder jumper is indicated by a 0 and shading a 1 unshaded indicates a location
12. est 1 5 Change the setup as follows e Press the Log Lin button on the audio analyzer to measure in dBu e Press the Ratio button twice to perform the next relative measurement e Deactivate the 400 Hz high pass filter on the audio analyzer e Change the frequency of the audio generator to 100 Hz Verify that the audio level is 0 dB 3 dB of your measurement in step 4 subsection F Activate the 400 Hz high pass filter on the audio analyzer and change the frequency of the audio generator to 10 KHz Verify that the audio level is 1 dB relative to the 1 kHz voltage recorded in step 4 of subsection F Return the frequency of the audio generator to 1 kHz H Audio Distortion Alignment 1 1 Set the audio analyzer to measure distortion Distn Verify that audio distortion is less than 0 5 If distortion is greater adjust R131 on the audio board for a minimum reading Verify the transmitter current in the 9 V supply line is as follows MPT1345 X201 jumpered 60 mA 6 mA MPT1350 X201 open 53 mA 6 mA 13 Replacement Parts and Drawings EC1 Body Pack Transmitter Notes Replacement Parts and Drawings 14 25A1002 RA EC1 Body Pack Transmitter Replacement Parts and Drawings On the next page the parts are listed according to the designations from the pc board see figures 3 through 8 on pages 18 through 20 and the schematics at the end of this manual Parts shown on the ci
13. ignment 1 Plug the coaxial cable on the antenna output into the spectrum analyzer 2 Setthe spectrum analyzer as follows Center Frequency Carrier Span 30 MHz Reference Level 20 dBm Scale 10 dB div Replacement Parts and Drawings 10 25A1002 RA EC1 Body Pack Transmitter 3 Adjust C228 and C227 rf board for maximum power output Note To obtain the maximum output set the spectrum analyzer to indicate 10 dB per division while you make the initial adjust ments of C228 and C227 For their final adjustments set the spectrum analyzer to 2 dB per division Check the carrier output power indicated on the spectrum ana lyzer The maximum conducted power measurement varies ac cording to the applicable standard e MPT1345 X201 jumpered 5 dBm to 10 dBm MPT1350 X201 open 8 dBm to 17 dBm Note After measuring the output power add to it the calculated power insertion losses from the cables and connectors In table 2 page 8 frequencies marked with an asterisk are subject to standard MPT1345 They require a jumper at X201 to reduce the transmitter s output power C Frequency Alignment 1 Audio Alignment Remove the cable from the spectrum analyzer and connect it to the frequency counter through a 20 dB attenuator Adjust C243 to set the carrier frequency to FC 1 kHz Note If you measure 4 V at TP7 but cannot adjust the carrier frequency to FC 1 kHz check the programming jumpers Make
14. matic Resistors All resistors are surface mount with 9 W rating and 1 tolerance Capacitors Unless otherwise noted non polarized capacitors are surface mount NPO dielectric types with a 250 V capacity 15 Replacement Parts and Drawings EC1 Body Pack Transmitter Reference Designation Al Table 3 Replacement Parts Description Shure Part No commercial alternative Audio pcb assembly 90B8449J A2 Rf pcb assembly 90 85964 in the underlined space insert the proper letter code from the Group column in table 2 page 8 e g 90B85964 A3 Microphone jack pcb assembly 90B8420B E201 Antenna 70B8007 MP1 Case front 65A8173 MP2 Case back 65A8139 MP3 Belt clip 53A8247B MP4 Battery door 65A8226 Audio Circuit Board D101 Light emitting diode green 86C8422 J101 J102 Socket strip 56A8041 MP3 Battery clip 56A8066 Q101 Q104 Transistor NPN 183A38 MMBT5089LT1 Q105 Q102 Q103 Transistor PNP 183A01 MMBT5087T Q106 Transistor PNP 183A07 MMBT404AL R115 Trim pot 5 k log 46D8008 R131 Potentiometer 146F02 S101 Slide switch spdt 55B8048 S102 Slide switch spdt 5508048 U101 Integrated circuit 188A01 NE571D U106 Dual operational amplifier 188A02 TLO62ACDR Mic Jack Board J1 Four pin receptacle 9548188 RF Circuit Board A201 Voltage controlled oscillator assem 90 85974 in the underlined space
15. ne jack Board Bottom Replacement Parts and Drawings 20 25A1002 RA EC1 Body Pack Transmitter Schematics Note to Printer do not print this page Please print the attached schematics in the order they are listed e EC1 Audio Board letter size e EC1 Hf Board ledger size e EC1 VCO Board ledger size 2541002 RA 21 Replacement Parts and Drawings
16. nnected to lower the EC1 Body Pack Transmitter Alignment The rf and audio alignments are generally done together as a single continuous procedure Before beginning be sure to do the setup de scribed in the following subsection Test Conditions Test Conditions Initial Setup 1 Separate the rf board from the audio board 2 Prepare the rf board as follows Solder a short insulated wire to TP7 figure 6 page 19 This wire must extend enough beyond the board to be accessed by a probe when the two pc boards are plugged together Obtain an RG174 50 Q coaxial cable with a ferrite choke a BNC connector at one end and stripped leads at the other see the service equipment manual Unsolder and remove the antenna Attach the 50 Q coaxial cable s center conductor to the antenna solder pad and the shield to ground see figure 5 page 19 Plug the rf and audio boards back together 4 Connect a 9 Vdc power supply to the battery terminals on the audio board the green LED should glow 5 Onthe audio analyzer activate the 400 Hz high pass and the 30 kHz low pass filters RF Alignment A VCO Alignment This small pc board is enclosed in a metal shield on top of the rf board To access C409 remove the date code label from the top of the shield 1 Connect the dc voltage probe to the wire you attached to TP7 2 Adjust C409 for 4 Vdc 0 5 Vdc at TP7 3 Remove the wire from TP7 B RF Power Al
17. rcuit dia gram and not listed below are available at electronic parts distributors On the pages following the parts list are the drawings of the printed circuit boards and the schematics Product Changes This section briefly describes significant changes to the EC1 Microphone Jack In 1994 the microphone jack board was changed to the B version which accepts a WA302 guitar cable The change included new values for C301 and C302 on the jack board and to C104 and R119 on the audio board It also changed the input imped ance from 100 Q to 1 MQ Battery Terminals In 1995 the battery clips were changed to stain less steel The present version may be used as a direct substitution on earlier models Dual Operational Amplifier U106 Temporary shortages of the Shure part number 183A02 necessitated various substitutions The pres ent part number may be used to replace any of those earlier substitutes at U106 on the audio board J Frequency Code Starting in the summer of 1997 EC Series transmitters and receivers tuned to 175 000 MHz have been labeled as BB rather than J The change was made to avoid confusion with the different meaning of the J designation in the LX88 and ELX88 units It is only a labeling change the units are physically the same The relabeling does not apply to other 175 MHz units e g EE Parts Designations 25A1002 RA The following comments apply to the parts list and the sche
18. sure the microphone is turned on D Gain 1 Unsolder and remove the 50 Q coaxial cable then resolder the an tenna to the rf board Connect the audio analyzer s output to pins 3 and 1 of the unit s microphone input connector If necessary use an appropriate adapter cable Set the audio analyzer as follows e Frequency 1 kHz e Amplitude 32 mV Adjust the audio gain control R115 for 0 dBu 0 775 Vrms 0 5 dB at TP4 on the rf board E Deviation Reference Voltage 1 Turn off the EC1 2 Connect the output of the audio generator to the modulation in 25A1002 RA put of the rf signal generator 11 Replacement Parts and Drawings EC1 Body Pack Transmitter 3 Set the rf signal generator as follows Frequency Carrier e Modulation FM e Modulation Source Ext 1 kHz e FM Deviation 15 kHz e Amplitude 38 dBm 4 Set the frequency on the audio generator to 1 kHz and adjust the level until the Hi Ext and Lo Ext lights on the signal generator turn off 5 To modify and use an SC4 receiver for testing at the if frequency see the Service Equipment manual Otherwise obtain a receiver set to the same frequency as the transmitter usually the EC4 that came with the unit and prepare it as follows e Disconnect the antenna s from the receiver input and con nect the output of the rf signal generator to either antenna input of the receiver e Set the Volume control on the front panel of
19. tal oxide semi conductor field effect transistor buffer stage which isolates the vco from subsequent circuits A seven pole low pass filter is added to the output of the buffer These two stages are shielded to prevent external rf fields from affecting their operation and to reduce harmonic radiation from the oscillator Regulated 5 Vdc power ensures frequency stability despite changes in battery voltage The use of a phase locked loop pll frequen cy synthesized system eliminates the need for multiplier stages resulting in a much higher degree of spectral purity At this point the rf signal splits into two paths The output of the vco assembly described above is coupled by C208 to the frequency control section and by C213 to the rf output section Frequency Control Frequency Control An MB504L prescaler U202 is programmed by an MC145152 synthesizer U201 to divide the signal by 32 or 33 to de rive the comparison frequency The synthesizer contains a quartz con trolled reference oscillator circuit operating at 6 4 MHz Y201 which is factory calibrated by trimmer C243 Internal circuitry divides this signal by a factor of 128 to produce a 50 kHz reference frequency The factory pro grams the operating frequency of each unit by 13 solder jumpers on the rf printed circuit board which control the internal synthesizer divider cir cuitry DC Control Voltage The synthesizer output a series of pulses is integrated by loop filter U2
20. the receiver to its maximum fully clockwise position and apply power to the receiver e Set the receiver s Squelch control to its midway position e Terminate the receiver s unbalanced output 4 jack with a 1 kQ resistor 6 The measured rms voltage at the unbalanced output should be 382 mV 66 mV between 4 8 and 7 8 dBu which corre sponds to a deviation level of 15 kHz If it is not the receiver needs tuning Record this voltage as the Deviation Reference Voltage Note At this point you may want to press the audio analyzer s Ratio button to perform the relative measurement in the next section and its Log Lin button to display the measurements in dB F Frequency Modulation Alignment 1 Turn off the rf output of the rf signal generator Disconnect the output of the signal generator from the receiver Connect an an tenna to either antenna input of the receiver 2 Verify that the audio analyzer s output is connected to the micro phone jack Turn on the transmitter s Power and Mute switches 3 Setthe audio analyzer as follows e Frequency 1 kHz Amplitude 32 mV 4 Measure the voltage at the high Z output 1 4 jack of the receiv er Adjust R204 so this voltage is within 1 dB of the deviation ref erence voltage measured in step 6 of the preceding subsection Replacement Parts and Drawings 12 25A1002 RA DC Current Test 25A1002 RA EC1 Body Pack Transmitter G Frequency Response T
21. top half of the case upside down then orient the rf board so its gold pins point up Fit the board inside the case and over the plastic bosses studs Slide the rubber grommets over the plastic bosses protruding through the rf board Fit the audio board over the rf board so that the sockets on the audio board line up with the pins on the rf board Make sure the front panel is seated properly in the slot at the front of the case that the battery terminals are inside the battery compartment and that the bosses are just below the surface of the audio board Orient the the battery cover so its Open arrow points toward the antenna and will be on the outside Fit the cover into the slots at the edge of the battery compartment opening on the top case half closed position Place the bottom half of the case over the audio board and align the edges of the case sections Note Make sure the front panel battery clips antenna and con nector pins are properly aligned and seated before joining the two case sections Align the two case sections and make sure they are properly seated before securing them with the two Phillips screws Replacing the Belt Clip The belt clip is secured with a single Phillips screw When replacing the clip be sure to fit the section with the screw hole inside the square indentation in the rear case Replacement Parts and Drawings 6 25A1002 RA EC1 Body Pack Transmitter Service Procedures R
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