Motorola R2001C Скачать руководство пользователя страница 60 | Manualshive

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Содержание R2001C

Страница 1: ... MOTOROLA INC test equipment Communications System Analyzer OPERATOR S MANUAL 68P81 069A70 0 ...

Страница 2: ... Motorola at its option will either repair or replace the product providing that Motorola receives written notice specifying the nature of the defect during the period of warranty and the defective product is returned to Motorola at 1313 East Algonquin Road Schaumburg IL 60196 transporta tion prepaid Proof of purchase and evidence of date of shipment packing list or invoice must accompany the retu...

Страница 3: ...MOTOROLA Communications Sector Motorola Inc 1983 All Rights Reserved Printed in U S A R 2008C Motorola Test Equipment Products 1313 E Algonquin Rd Schaumburg IL 60196 68P81069A70 0 6 28 84 MG ...

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Страница 5: ... transceiver C 666 channels D SAT frequency checking E Power level control F Channel handoff G NAM installation checking H Manual control of the transceiver 4 0 R2008C TEST CAPABILITIES A Built in signaling modem B Single channel operation C Cell initiated mobile initiated automatic and manual test sequences D SAT tone verification E Signaling data verification F Test progression indicator G Frequ...

Страница 6: ...ANUAL TEST a Command Entry b Command List i Input and output descriptions c Examples of use AUTOMATIC TEST SEQUENCE a Test Initialization b Test Output c Printer operation 5 0 APPLICATION NOTES A Receiver audio level testing B Transmitter deviation C Receiver sensitivity D Duplex sensitivity E Power level setting F SAT phase G RSSI level testing H Testing Signalling at Threshold Level APPENDICES A...

Страница 7: ...E Warning and Error Messages 54 F Manual Test Commands 58 G Epson RX 80 Printer Setup 64 DEXYTa 68 81069A70 0 ...

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Страница 9: ...nd to execute performance tests normally associated with a transciever A fully automatic test sequence is provided which sequences through an operator selectable number of the 666 cellular channels and measures the transmitter output power frequency error and modulation limiting for each channel An RS232 printer output 1200 baud is available in the Auto Test mode to create a test result printout w...

Страница 10: ... Display All functions generated or monitored are presented on an 8 em x 10 em cathode ray tube CRT in both analog and digital format with the name of the function being displayed The CRT also displays control settings eliminating the need for operator search of different equipment panels Digital readouts are visually aided by the use of the continuously auto ranging analog line segments which are...

Страница 11: ...zer and from external inputs The external modulation can be voice from a standard Motorola mobile radio microphone which plugs into the front panel of the instrument as well as a signal applied to the external BNC input Separate controls are provided for independently setting the levels of the 1 kHz tone the code synthesizer and the external modulation sources the 1 kHz test tone is a convenient s...

Страница 12: ...ement accuracy The off the air monitor function enables frequent parameter checks without leaving the shop thus spotting system degradation early and keeping service costs down Bandwidth can be set wide for off channel signal location or wide band FM or narrow for maximum sensitivity and selectivity IF display When the IF display mode is selected the communica tions system analyzer s receiver IF e...

Страница 13: ... power measuring circuitry the audible alarm sounds and the CRT display changes to read RF load over temp thus warning the technician to de key This instrument function is further enhanced by the simultaneous indication of RF power output carrier frequency error and modulation all on the same CRT display In line power measurement Use of the Motorola ST 1200 series wattmeter elements in conjunction...

Страница 14: ...tion Frequency measurement of transrnitted carriers and other signals higher than 35 MHz is easily accom plished with the frequency error readout in the monitor modes AC DC Voltmeter Switching to the DVt1 mode provides a digital analog voltage presentation on the CRT along with the corres ponding dBm value The auto ranging display provides full scale deflections of 1 10 100 and 300 volts AC or DC ...

Страница 15: ...cess channels Paging channels are the normal holding place for the idle cellular radio When a call is received at the central controller for a cellular radio the paging signaling will occur on a paging channel In responding to a page or when originating a call the radio telephone will use an access channel where two way data transfer occurs to determine the initial voice channel In many systems al...

Страница 16: ...dio acknowledges the page and thus notifies the central controller of its cell location The controller then assigns a voice channel and a SAT code to the radio Upon reception of the voice channel command the radio tunes to the voice channel verifies the presence of the proper SAT frequency and transponds the tone back to the cell site At the cell site the reception of the SAT tone signals the cent...

Страница 17: ...as terminated by the user of the cellular radio the signaling tone burst signals the cental controller which terminates the connection In either case after call termination the cellular radio goes back to rescan the nationwide set of forward control channels and repeats the process it performed at first turn on to re establish itself on a paging channel When the call originates at the cellular rad...

Страница 18: ...r will extinguish when the radio has successfully tuned to decoded and responded to the FOCC signal A failure at this portion of the sequence would most likely indicate that the receiver or the receiver controller interface circuitry has failed The manual test mode of the R2008C which allows separate control and monitoring of the receiver transmitter and controller status can be used to isolate th...

Страница 19: ...e use of the channel handoff capability From the cellular control display the signaling necessary to cause the radio to move to any cellular channel can be initiated For the handoff the R2008C verifies the response from the radio and once on the new channel verifies the correct SAT response Again error messages are generated in the event of a failure and with the manual test mode can be used to is...

Страница 20: ...s at a relatively fast rate making it ideal for multiple frequency checks necessary for more complete cellular testing Once the desired channel numbers are selected in the initial parameters screen the R2008C automatically switches its transmit and receive frequencies to simulate transition from a forward control channel to a forward voice channel or from one voice channel to another to simulate a...

Страница 21: ... turned on This version number display will stay on the screen for 10 seconds then normal operation ensues A manual test mode allows the operator to command the cellular telephone with any one of the 43 commands defined by the Advanced Mobile Phone Service AMPS specification of May 1983 The following sections describe how to physically set up a test using the RF interconnect or the manual test int...

Страница 22: ...upler to the mobile unit antenna connector A TNC to BNC adapter 58 80313833 may be required to connect to the mobile unit See figure 1 It is sometimes useful to access some test points on the control head to transceiver interface during the signalling test mode This is accomplished by using the cellular junction box RTL 4137A and the adapter cables included in either RPX 4272A or RPX 42738 MANUAL ...

Страница 23: ... DEXYTa SIGNALLING CONNECTION FROM R2008C TO CELLULAR TRANSCEIVER DDCD DODD DODD FIGURE 1 R2008C JD RF IN OUT VARIABLE TAP RF COUPLER PART OF RPX 4272A OR RPX 4273A RTL 41 37A 0 0 0 0 0 68 81069A70 0 TNC TO BNC ADAPTER TRANSCEIVER 15 ...

Страница 24: ... level to near threshold Turn counter clockwise until the Sig Lvl light comes on then back off a small amount 11 Set the variable RF tap to 1 4 to 1 2 inch THE CELLULAR TEST SCREENS The cellular test is accessed via the tone memory display Enter 5 in the mode sel position to access the cellular test screens See figure 3 There are now 5 sub selections possible To access them move the cursor down to...

Страница 25: ...ID that does not match the one of the cellular telephones under test will force the telephone to go into the roam state The SID is a 15 bit binary number entered in decimal MOBILE ID Enter the telephone number of the cellular telephone under test Entering a MIN that does not match that of the radio under test will prevent the cellular telephone from being called in the cell initiated test The mobi...

Страница 26: ...e R2008C simulating the cell site initiates a call to the cellular telephone The necessary sequence of events includes sending from the R2008C overhead messages a paging message an initial voice channel designa tion message power level command messages and handoff messages The testing also requires that the digital and signaling tone responses to these commands be processed and checked FIGURE 5 CE...

Страница 27: ...ervice light has gone out before starting the sequence test Then enter a 2 after the SEL to start the test The R2008C will immediately start to execute the call sequence As each step in the sequence is completed the space above or below the square will fill in in a thermometer style progression If errors are detected a warning will be displayed near the bottom of the screen if it is a non fatal er...

Страница 28: ...EST RESULTS DISPLAY CELL INIT SEQ TEST 1 ABORT SEL 2 TEMPORARY EXIT fJ 2 4 6 8 10 121 L 3 5 7 9 111 CHAN 1 380 PL 0 SAT 3 MN 800 576 5444 SN 8205E045 ERR KHZ 0 24 PWR W 0 89 MOD KHZ 2 12 Move the cursor down and over to the PL label and select power levels 0 to 7 to command the cellular telephone to any one of its 8 possible power levels Key 0 is the highest power level and key 7 is the lowest pow...

Страница 29: ...r a 2 on the R2008C To handoff to FVC 4 enter a 4 Handoffs can be performed as many times as desired in any order The 50 msec signaling tone response generated by the cellular telephone is measured for duration and an error message is shown on the R2008C if out of limits Every handoff will automatically rotate the supervisory audio tone SAT Handoffs to the same FVC will result in a new SAT tone on...

Страница 30: ...vancing to the right by keying any number 1 to 9 The squares on the top row of the thermometer display indicate actions that will be taken by the R2008C during the test The squares on the next line indicate actions that the mobile takes are perceived by the R2008C Note that the first square is filled in since the R2008C begins an FOCC data stream upon entry into the mobile initiated sequence test ...

Страница 31: ...exits are allowed to analyze the signal handoffs are allowed to any one of the four preselected forward voice channel frequencies power level changes can be commanded or the SAT can be changed to force a telephone drop out And as in the cell initiated test the call can be terminated either by pressing the END key or by entering a 1 End on the top line of the display For a detailed description of t...

Страница 32: ...nter the desired command The R2008C will display a mnemonic describing the command If the particular command requested requires additional bytes dashed lines will indicate where they should be entered on the screen See Fig 10 If this is the case move the cursor over to the dashed lines and make the necessary entries If hexadecimal data is required use the normal 0 9 keys but in addition use the up...

Страница 33: ...DEXYTa MANUAL TEST HOOKUP 2008 TO POWER SUPPLY CELLULAR RADIO 68 81069A70 0 JUNCTION BOX 25 ...

Страница 34: ...sent requires that the cellular telephone return information the R2008C will display the returned data automatically If failures occur in the handshaking procedure an error message will be displayed on the bottom of the screen Normally the first command entered is an 01 SUSPEND command to set the transceiver into the test mode so that the other commands can be utilized Otherwise only STATUS TURNAR...

Страница 35: ... channel is the first in the series of channels to be tested The other three FVC selections are used only in the cell and mobile initiated sequences FVC INCREMENT This parameter specifies the channel spacing for the automatic handoffs So if this is 100 then every 100th channel will be checked PRINTER 1 YES O NO Select a 1 if a printer is desired and select 0 if not The printer is required to have ...

Страница 36: ...28 2008 TO POWER SUPPLY CELLULAR RADIO AUTO TE flii 1K JP 25 PIN CONNECTOR TO PRINTER 50 PIN CONNECTOR NO CONNECTION _ I MOBILE PHONE CONTROL HEAD 0 RX 0 TX 0 RSSI JUNCTION BOX 68 81069A70 0 DEXYTa ...

Страница 37: ...k onto the data stream the R2008C will page the mobile using the Mobile ID number sent by the mobile in the earlier part of the test When the mobile begins to ring the operator has 10 seconds to answer before the 10 kHz signalling tone interferes with the SAT and deviation measurements The R2008C will now display frequency error power output and 1 kHz modulation deviation from the mobile under tes...

Страница 38: ...h to BYPASS and adjust radio again for 100 mV 8 Increase 1 kHz deviation to 8 kHz read distortion in either DVM DIST or GEN MON display 9 Data distortion Using DVM DIST display and with modulation still 1 kHz at 8 kHz deviation measure level at discrimin ator test point junction box test point for AMPS bus com pliant radios internal radio test point for others Using tone memory display input 9999 ...

Страница 39: ...0 0 c I 0 m 0 z Q z m m z 0 t 2008 VERT SINAD INPUT TO POWER SUPPLY CELLULAR RADIO DEXYTa FIG 12 25 PIN CONNECTOR NO CONNECTION DISCRIMINATOR 68 81069A70 0 JUNCTION BOX 31 AC VOLTMETER ...

Страница 40: ... deviation on frequencies other than 1 kHz Send manual mode command 13 TX mute to mute transmitter audio for further tests 4 Signalling tone deviation can be set by sending the manual mode command 16 Signalling Tone On to the transceiver unit Set deviation to 8 kHz measured on GEN MON display Manual mode command 17 Signaling Tone Off will deactivate the transceiver signaling tone generator 5 DTMF ...

Страница 41: ...on desired frequency 870 channel X 0 03 MHz with 1 kHz modulation at 8kHz deviation 5 Bypass the compandor on the transceiver unit 6 Adjust the RF output level on the R2008C for a 12 dB sinad reading in GEN MON display NOTE One can expect to see a difference of about 1 dB of RF level between a C message weighted sinad measurement and a flat weighted sinad measurement on the R2008C i e 115dBm on th...

Страница 42: ...e Duplex Gen vernier for 45 MHz offset Adjust 1 kHz modulation for 8 kHz deviation Set function switch to PWR MON 6 Using manual test mode send the following commands to the transceiver unit 01 Suspend 09 Load synthesizer input desired channel 12 Receiver unmute 7 Connect RX audio on junction box to sinad input on R2008C 8 Using DVM DIST display adjust variable tap on RF tee for 12 dB sinad 9 Usin...

Страница 43: ...DEXYTa Fl G 13 20 b VERT SINAD INPUT TO POWER SUPPLY CELLULAR RADIO 68 81069A70 0 v 0 0 JUNCTION BOX 35 ...

Страница 44: ...mW 12mW 4 8mW dBm 34 8 30 8 26 8 22 8 18 8 14 8 10 8 6 8 3 Note power level in Gen Mon display For the lower power levels use the R2008C spectrum analyzer 4 Select the spectrum analyzer display and note the relative power level in dB 5 In the Tone Memory display execute manual mode command 10 Set Attenuator select desired attenuation 6 Determine power level by using the spectrum analyzer display 3...

Страница 45: ... kHz deviation on Duplex Gen display 6 Set function switch to power monitor Using Manual mode execute the following commands 01 Suspend 09 Load Synthesizer to desired channel 07 Carrier on 32 Saton select SAT 01 7 Using Gen Mon display adjust SAT deviation control in radio for 2 kHz deviation 8 Connect Mod Out to Ext Horiz In with patch cable 9 Connect Vert In to transceiver modulator test point 1...

Страница 46: ...2008 VERT SINAD IN loLl ID 0 IC loLl 0 u I SCOPE PROBE AMPS COMPLIANT NON AMPS COMPLIANT CELLULAR RADIO 38 Fl G 14 68 81069A70 0 25 PIN CONNECTOR NO CONNECTION MODULATOR JUNCTION BOX DEXYTa ...

Страница 47: ...DEXYTa I 38 I o I L5 I o bO 2 J It I t I I I I E v J_ t I 10 I 2 5 I KHZ 10 2 5 5 0 Fig 15 SAT phase adjustment Lissajous figure showing 10 of phase shift 68 81069A70 0 39 ...

Страница 48: ...desired channel 3 Connect the R2008C RF In Out port to the mobile and turn off the Duplex Generator Select the desired frequency on the display 870 MHz 0 03x channel 4 Set the R2008C to the DVM screen Connect the Vert Sinad input to the RSSI test point on the junction box Adjust the RF step and vernier controls for the desired output level 5 The transceiver RSSI voltage should start at from 0 to 0...

Страница 49: ...2008 Fl G l 6 VERT SINAD INPUT SCOPE PROBE CELLULAR RADIO DEXYTa 68 81069A70 0 25 PIN CONNECTOR NO CONNECTION 0 AX JUNCTION RSSI 80 X 0 TX 41 ...

Страница 50: ...the RSSI test point 7 Connect the R2008C to the transceiver unit via the variable RF tee as in the Cell and Mobile Initiated Sequence tests Reconnect the control head to the transceiver unit 8 Insert a 60 dB attenuator part no 58 80314821 in series with the Duplex Generator output Set the variable tap on the RF tee to fully in maximum coupling 9 On the Initial Parameters screen select one of the F...

Страница 51: ...zontal time axis is not to scale this illustration is a conceptual overview of the handshaking that takes place in a cellular system FOCC RELEASE ALERT ORDER POWER LEVEL ORDER HANDOFF ORDER OVERHEAD DATA lOKHZ DEV MOBILE SCANS SAT 2KHZ DEV INITIAL VOICE CHANNEL MESSAGE SAT VOICE PAGE RESPONSE INITIAL VOICE CHANNEL RESPONSE POWER LEVEL ORDER CONFIRMATION lOKHZ TO FIND STRONGEST SAT SAT DATA CHANNEL...

Страница 52: ...contains the mobile telephone number entered in the initial parameters screen 4 Voice channel designation message sent The R2008C sends a message to command the mobile to a forward voice channel 6 Alert order sent The R2008C sends out an alert order to command the mobile to start t inging 8 Power level command sent A high power level command is sent by the R2008C to the mobile 44 3 Page response a...

Страница 53: ...accepted The R2008C has re ceived an order confirmation from the mobile the other power levels possible from the mobile Handoffs to the four possible forward voice channels can be made A SAT drop test can be performed 12 TEST COMPLETED DEXYTa 11 Release signaling tone accepted The R2008C has re ceived a termination signaling tone 68 81069A70 0 45 ...

Страница 54: ...ion message sent The R2008C sends a message to the mobile instructing it to tune to a forward voice channel 5 P01 rer level command sent A high power level command is sent by the R2008C to the mobile 2 Service request accepted with called address The R2008C accepts the service request messagep displays the tele phone number the mobile and serial number from the mobile 4 SAT accepted The R2008C mea...

Страница 55: ... the four possible forward voice channels can be made A SAT drop test can be performed 9 TEST COMPLETED DEXYTa 8 Mobile terminates RVC The R2008C has received a termina tion tone from the unit under test 68 81069A70 0 47 ...

Страница 56: ...BILE ID FOCC FVC 1 TO 4 Enter cell initiated sequence test screen The R2008C starts to send a continuous stream of system parameter overhead messages 43 MOBILE Power up mobile Mobile performs DC power up task Mobile performs initialization task A Scan control channels B Tune to R2008C FOCC C Acquire word sync D Receive overhead messages E Update overhead information Perform paging channel selectio...

Страница 57: ...ge Tune to FVC Perform initial voice channel confirmation subtask A Tune receiver to R2008C FVC B Adjust transmit frequency to Accept transponded SAT as an indication of mobile confirmation Send alert order Accept signaling tone 10kHz as confirmation of alert order RVC c Adjust rf power to VMAC D Turn on SAT E Set DSCMM to SCC Enter waiting for order task Receive alert order A Turn on 10 kHz signa...

Страница 58: ...C SAT drop testing permitted Select a new SAT frequency 1 3 Repeat power level and or hand offs above as desired Temporary exits allowed to analyze signals using the other R2008C modes Receive termination signaling tone Check for proper duration Adjust power level to that re quested and send order confirmation Send a 50 msec signaling tone as a confirmation Change to the new RVC If a new SAT selec...

Страница 59: ...k A Scan control channels B Tune to R2008C FOCC C Acquire word sync D Receive overhead message E Update overhead information Perform paging channel selection task A B Scan paging channels Tune to R2008C FOCC C Acquire word sync D Receive overhead message E Perform overhead message processing task Enter idle task Examine data for A Page match B User request C Order D Ovehead message Enter originati...

Страница 60: ...nitial voice channel confirmation subtask A Tune to RVC B Adjust rf power to VMAC C Turn on SAT transponder D Set DSCMM to SCC Enter conversation task Adjust power level to high and send order confirmation Manual power level testing permitted Select power level 0 7 Handoff testing permitted handoffs to FVC 1 4 allowed Confirm 50 msec signaling tone for handoff Switch to new FVC 52 Adjust power lev...

Страница 61: ... Repeat power level and or handoffs as desired Temporary exits allowed to analyze signals using the other R2008C modes Accept 1 8 second termination signaling tone Display error if out of limits On hook mobile hangs up Sends 1 8 second signaling tone 10 kHz End of mobile initiated sequence test DEXYTa 68 81069A70 0 53 ...

Страница 62: ...ansceiver has not set TCL high WARNING 001 Power level order confirmation not accepted The R2008C has sent the cellular telephone a power level command The telephone s confirmation has not been received or it has been detected as incorrect Possible causes are low cellular telephone sensitivity excessive loss in the RF test connections or an attenuation setting that is too high on the R2008C WARNIN...

Страница 63: ... telephone is attenuated too much due to a problem with the RF cable hookup the R2008C has too much attenuation dialed in on its front panel or if the cellular telephone has a transmitter that is below normal power This is visually verified by looking at the red Sig Lvl lamp on the R2008C front panel and by checking the current drawn by the transceiver unit Normally the LED will light once for a s...

Страница 64: ...by the cellular telephone This error generally indicates that the cellular telephone has not shifted frequencies correctly as a result of an initial voice channel designation message or a handoff message This error can be induced if the background ambient noise during a test is excessive NOTE The following errors are related to the manual test mode ERROR 21 Refer to Fig 11 for an example of the ST...

Страница 65: ...nsceiver has not set TCL high This error indicates that a command requiring returned infromation has been sent and the DCL has gone high indicating the transceiver is to return data and the TCL has gone low to flag the R2008C to read the data from the manual bus however the TCL has not gone back high to indicate the R2008C has read the manual bus The transceiver should return TCL high when it sens...

Страница 66: ...e channel BI Current state of majority voted busy idle 0 busy 1 idle SAT SAT frequency is encoded as follows 00 5970 Hz 01 6000 Hz 10 6030 Hz 11 NO SAT LOCK 04 RESET Reset the autonomous timer 05 TURNAROUND echo the byte following the command to the R2008C requires 1 byte additional data 06 INIT Initialize the transceiver unit to the following state 1 Carrier off 2 Attenuation 0 DB 3 Receive audio...

Страница 67: ...ard control channel dat present The trans ceiver unit shall turn on the carrier at the start of transmission and turn off the carrier at the termination 19 VOICE Transmit a 2 word reverse voice channel message Each of the 2 words shall consist of the same 48 bit data pattern specified for the setup command The Trans ceiver unit shall turn on the carrier at the start of transmission and turn off th...

Страница 68: ... when it is in its home MSA Access overload class ACCOLC The ACCOLC is a 4 bit number that identifies which overload class field is used to control access by the mobile equipment Preferred system mark This 1 bit mark when set to 1 1 identifies that the mobile equipment s preferred system is system A RCC otherwise the preferred system is system B WCC Group identification mark GI The GIM is a 4 bit ...

Страница 69: ...l 28 WSTS Receive contiguous 1 word messages on the control channel Maintain a count of the number of word synchronization sequences 11100010010 detected until a terminate command is received The counter shall be 16 bits wide and the data shall be returned in the following format BYTE 1 BYTE 2 15 7 8 0 29 WSTV Same as WSTS except on the voice channel 30 BIBIT Receive continuous forward control cha...

Страница 70: ...tone 770 Hz and apply it to the receive audio line 38 LOTNOFF Deactivate the low audio tone 39 INVM Initialize non volatile memory Set registration memory and called address repertory memory to zeros Set lock state to active locked 40 RNVM Read non volatile memory and return to TS The least significant bit of the first byte transmitted shall contain the lock state active locked The next 80 bytes t...

Страница 71: ...te following the command Apply DTMF signals to the modulator and DTMF sidetone to the receive audio line K E Y C 0 D E s 00 09 CORRESPOND TO 0 9 ON KEYPAD 10 15 AUX ALERT 11 II 16 CLR 12 SEND 17 STORE 13 END 18 RECALL 14 LOCK 19 NUTE 43 DTMFOFF deactivate the DTMF generator DEXYTa 68 81069A70 0 63 ...

Страница 72: ...1 2 off 2 2 on 1 3 off 2 3 off 1 4 off 2 4 off 1 5 off 1 6 on 1 7 on 1 8 on 8148 Serial Board DIP SW1 1 1 off DIP S 12 2 1 on off parallel 1 2 off 2 2 on 1 3 off 2 3 off 1 4 off 2 4 off 1 5 on 2 5 off 1 6 off 2 6 off 1 7 off 1 8 off Leave jumpers in factory set position Note If the printer is also to be used as a parallel printer for the R 1801A NAH application DIP SW2 1 on the 8148 board may be b...

Страница 73: ...QUEST FORM This completed form must accompany equipment returned for service CUSTOMER S PURCHASE ORDER NO 1 DATE MODEL NUMBER SERIAL NUMBER DESCRIPTION OF PROBLEM I REQUESTED SERVICE I SHIP TO ADDRESS I SHIP VIA I Providing the information below will reduce the turnaround time on your Test Equipment Service I j MOTOROLA CUSTOMER NUMBER BILL TAG SHIP TAG INTERNAL MOTOROLA ACCOUNT NO I SIGNED ______...

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Страница 76: ...lll lll 11 llfl ll 111 1Ill 0 0 3 3 c z 0 0 z J J J t m 3 z N m JJ 0 X D X 0 0 CD 0 I 0 ...

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