Vertex_VX-2500V_serv.pdf

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1、1 VHF FM Transceiver VX-2500V Service Manual Introduction This manual provides technical information necessary for servicing the VX-2500V Transceiver. Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified persons to service this equipment ma

2、y result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board is referred to by the type of the majority of components installed on that side (“leaded

3、” or “chip-only”). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. While we believe the technical information in this manual to be correct, Vertex

4、Standard assumes no liability for damage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical information would be appreciated. Specifications . 2 DSUB 9-pin Accessory Connector. 3 Exploded View realign

5、ment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by au- thorized Vertex Standard service technicians who are ex- perienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault is suspected, cont

6、act the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized Vertex Standard service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components. Those who do unde

7、rtake any of the following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy. Also, Vertex Standard reserves the right to change circuits and alignment proce- dures in the interest of improved perform

8、ance, without notifying owners. Under no circumstances should any alignment be attempt- ed unless the normal function and operation of the trans- ceiver are clearly understood, the cause of the malfunc- tion has been clearly pinpointed and any faulty compo- nents replaced, and realignment determined

9、 to be abso- lutely necessary. The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment result- ing from use of improper test equipment is not covered under the warranty policy. While most steps

10、do not re- quire all of the equipment listed, the interactions of some adjustments may require that more complex adjustments be performed afterwards. Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps. Have all test equipment ready before beg

11、inning, and follow all of the steps in a section in the order presented. Required Test Equipment ? RF Signal Generator with calibrated output level at 500MHz ? Deviation Meter (linear detector) ? In-line Wattmeter with 5% accuracy at 1000MHz ? 50 RF Dummy Load with power rating 100W at 500MHz ? 4 AF

12、 Dummy Load ? Regulated DC Power Supply (standard 13.8V DC, 15A) ? Frequency Counter with 0.1ppm accuracy at 500MHz ? AC Voltmeter ? DC Voltmeter ? VHF Sampling Coupler ? IBM PC/ compatible Computer ? Oscilloscope ? Vertex Standard VPL-1 Connection Cable & Alignment program Alignment Preparation & P

13、recautions A 50 RF Dummy Load and in-line wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct alignment is not possible with an antenna. After completing one step, read the following step to de- termine whether

14、the same test equipment will be required. If not, remove the test equipment (except dummy load and wattmeter, in connected) before proceeding. Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equipment, and that this temperature be held constant

15、 between 68F and 86F (20C 30C). When the transceiver is brought into the shop from hot or cold air, it should be allowed time to come to room temperature before alignment. Whenever possible, alignments should be made with os- cillator shields and circuit boards firmly affixed in place. Also, the tes

16、t equipment must be thoroughly warmed up before beginning. Note: Signal levels in dB referred to in the alignment pro- cedure are based on 0dBm EMF = 0.5mV. 12 Setup the test equipment as shown below, apply 13.8V DC power to the transceiver. The transceiver must be programmed for use in the in- tend

17、ed system before alignment is attempted. The RF pa- rameters are loaded from the file during the alignment process. PLL VCV ? Connect the positive lead of the DC voltmeter to the test point TP1007 (VCV) on the RF-Unit, as indicated in the figure, and the negative lead to chassis ground. ? Set the tr

18、ansceiver to the high band edge fre- quency channel, then adjust coil L1017 on the Unit for 7.25V on the voltmeter. ? Key the transmitter, and adjust coil L1020 on the Unit for 7.25V on the voltmeter. ? Next select to the low edge frequency channel and confirm above 2.00V to 3.00V on the volt- meter

19、. ? Key the transmitter, and confirm above 2.00V to 3.00V on the voltmeter. PLL Reference Frequency With the wattmeter, dummy load and frequency counter connected to the antenna jack, and select band center fre- quency channel, key the transmitter and adjust VR1001 on the RF-Unit, if necessary, so t

20、he counter frequency is within 100 Hz of the channel center frequency for the trans- ceiver version. Alignment Important In order to facilitate alignment over the complete switch- ing range of the equipment it is recommended that the channel data in the transceiver is preset as the chart be- low. RF

21、 Unit Test & Alignment Points TP1007 L1017 L1020 VR1001 Transceiver The alignment mode is accessed by “Alignment mode” command from the computer whilst switching on. And it is operated by the alignment tool automatically. During the alignment mode, normal operation is suspend- ed. Use the alignment

22、tool program running on PC. CHANNEL CH 1 CH 2 CH 3 CH 4 CHANNEL SPACE Wide Narrow Wide Wide Version A 147.100 MHz 147.100 MHz 134.100 MHz 159.900 MHz Ver. C 161.100 MHz 161.100 MHz 148.100 MHz 173.900 MHz FREQUENCY (SIMPLEX) 13 The alignment tool outline Installation the tool This alignment tool con

23、sists, MS-DOS based, only one ex- ecute file “svc47.exe.“ You make a directly as you think fit, and copy this file. That is all of the installation pro- cess. Boot the tool Change directly and input in command line, “svc47 en- ter,“ and boot the alignment tool. Preparation Setup the test equipment a

24、s “Alignment Preparation & Precautions.” Set the RF Ch. List to Table 1 on the CE47 Clone editor software. Enter to the alignment mode To enter the alignment mode, press “0 Alignment Mode” on the personal computer Key board. You turn off the power of the transceiver, and turn on the transceiver. If

25、entry succeed,the alignment tool display as follows. 0Common TX 1Common RX Action of the switches When the transceiver is in alignment mode, the action of PTT, MON, UP, and DOWN is ignored. All of the action is remote controlled by PC. Menu of the tool 0 Common TX - 0 Tx Power High This parameter is

26、 used to align TX High power (25W). ? Press Enter on “0 Tx Power High” to align TX High power. ? Select the Channel “1“ in alignment range. ? Press the Space key on the keyboard to acti- vate the transmitter. ? Press the UP or DWN key, as needed, to set the power output to the following specificatio

27、n, as indicated on the external wattmeter. Tx Power High: 25 W (0.5W) ? When the 25 Watt level is attained, press Enter to lock in the new data. - 1 Tx Power Low This parameter is used to align TX Low power (5W). ? Press Enter on “1 Tx Power Low” to align TX Low power. ? Select the Channel “1“ in al

28、ignment range. ? Press the Space key on the keyboard to acti- vate the transmitter. ? Press the UP or DWN key, as needed, to set the power output to the following specification, as indicated on the external wattmeter. Tx Power Low: 5 W (0.1W) ? When the 5 Watt level is attained, press Enter to lock

29、in the new data. - 2 VCO Deviation This parameter is used to align the VCO Deviation. ? Press Enter on “2 VCO Deviation” to align VCO Deviation. ? Select the Channel “1“ in alignment range. ? Adjust the AF generator output level to 38mVrms (26dBm) at 2 kHz to the pin 3 of the J1502 (D-sub 9pin ). ?

30、Press the Space key on the keyboard to acti- vate the transmitter. ? Press the UP or DWN key, as needed, to set the VCO Deviation (Wide) to the following speci- fication, as indicated on the deviation meter. ? When the desired deviation level is attained, press Enter to lock in the new data. ? Selec

31、t the Channel 2, and set the VCO Deviation (Narrow), same as Channel “1.“ VCO Deviation (Wide): 3.0 kHz (0.1 kHz) VCO Deviation (Narrow): 1.5 kHz (0.1 kHz) Alignment 14 - 3 REF Deviation This parameter is used to align the REF Deviation. ? Press Enter on “3 REF Deviation” to align REF Deviation. ? S

32、elect the Channel “1“ in alignment range. ? Adjust the AF generator output level to 776mVrms(0dBm) at 300Hz to the pin 3 of the J1502. ? Press the Space key on the keyboard to acti- vate the transmitter. ? Press the UP or DWN key, as needed, to set the modulation wave as follows. ? Press Enter to lo

33、ck in the new data. ? Select the Channel “2,“ and set the modulation wave, same as Channel “1.“ - 5 DCS Deviation This parameter is used to align the DCS deviation. ? Press Enter on “5 DCS Deviation” to align DCS Deviation. ? Select the Channel “1“ in alignment range. ? Press the Space key on the ke

34、yboard to acti- vate the transmitter, and injects a DCS test tone. ? Press the UP or DWN key, as needed, to set the DCS deviation (Wide) to the following speci- fication. ? Press Enter to lock in the new data. ? Select the Channel “2,“ and set the DCS devia- tion (Narrow), same as Channel “1.“ DCS D

35、eviation (Wide): 0.60 kHz (0.1 kHz) DCS Deviation (Narrow): 0.30 kHz (0.1kHz) ? The actual DCS deviation will increase around 20% based on the above alignment as follows, Actual DCS Deviation (Wide): 0.70 kHz Actual DCS Deviation (Narrow): 0.35 kHz - 6 LTR Deviation This parameter is used to align t

36、he LTR deviation. ? Press Enter on “6 LTR Deviation “ to align LTR Deviation. ? Select the Channel “1“ in alignment range. ? Press the Space key on the keyboard to acti- vate the transmitter, and injects a LTR test tone. ? Press the UP or DWN key, as needed, to set the LTR Deviation (Wide) to the fo

37、llowing speci- fication. ? Press Enter to lock in the new data. ? Select the Channel “2,“ and set the LTR devia- tion (Narrow), same as Channel “1.“ LTR Deviation (Wide): 0.80 kHz (0.1 kHz) LTR Deviation (Narrow): 0.60 kHz (0.1 kHz) ? The actual LTR deviation will increase around 20% based on the ab

38、ove alignment as follows, Actual LTR Deviation (Wide): 1.00 kHz Actual LTR Deviation (Narrow): 0.70 kHz Alignment - 4 CTCSS Deviation This parameter is used to align the CTCSS deviation. ? Press Enter on “4 CTCSS Deviation” to align CTCSS Deviation. ? Select the Channel “1“ in alignment range. ? Pre

39、ss the Space on the keyboard to activate the transmitter, and injects a CTCSS test tone. ? Press the UP/ DWN key, as need, to set the CTCSS Deviation (Wide) to the following speci- fication. ? Press Enter to lock in the new data. ? Select the Channel “2,“ and set the CTCSS De- viation (Narrow), same

40、 as Channel “1.“ CTCSS Deviation (Wide): 0.70 kHz (0.1 kHz) CTCSS Deviation (Narrow): 0.35 kHz (0.1 kHz) OKNGNG 15 Alignment 1 Common RX - 0 Tight NSQL This parameter is used to align the noise level in squelch Tight. It adjusts this alignment RX Tuning after ending. ? Select the MID frequency chann

41、el in alignment range. ? Set the SG output level to 0dBm EMF, and obey the message. - 1 Threshold NSQL This parameter is used to align the noise level in squelch Threshold. It adjusts this alignment RX Tuning after end- ing. ? Select the MID frequency channel in alignment range. ? Set the SG output

42、level to 7dBm EMF, and obey the message. - 2 RX Tune This parameter is used to align RX Tune. ? Select the MID frequency channel in alignment range. ? Set the SG output level to 6dBm EMF. ? Pressing the DWN key, reduce the RX Tune Level and set the SINAD above 12dB. 16 RF Unit Jumper Information JP1

43、501 (JP1): Determine the output supply voltage at pin 8 of DSUB 9-pin Accessory Connector. Close: +5.0 V (Maximum 100 mA) Open: No Action JP1502 (JP2): Determine the output supply voltage at pin 8 of DSUB 9-pin Accessory Connector. Close: +13.8 V (Maximum 100 mA) Open: No Action JP1503 (JP3): Determ

44、ine the Rx discriminator output characteristic at pin 2 of DSUB 9-pin Accessory Connec- tor. Close: Flat 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination) Open: No Action JP1504 (JP4): Determine the Rx discriminator output characteristic at pin 2 of DSUB 9-pin Accessory Connec- t

45、or. Close: Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination) Open: No Action JP1505 (JP5): No Action (Spare Jumper). JP1506 (JP6): Define whether the TX Data Input at pin 3 of DSUB 9-pin Accessory Connector shall be on or off according to the external PTT Input signal si

46、gnal (pin 7 of DSUB 9-pin Accessory Connec- tor). Close: on (Enabled) Open: off (Disabled) JP1507 (JP7): Determine the TX Data Input level at pin 3 of DSUB 9-pin Accessory Connector. Close: 400 mVrms / STD deviation with 600 ohm termination Open: 40 mVrms / STD deviation with 600 ohm termination JP1

47、508 (JP8): Define whether the Transceivers power shall be on or off according to the Ignition Signal Input (pin 9 of DSUB 9-pin Accessory Connector). Close: Turn the transceiver on when the Ignition Signal Input (pin 9 of DSUB 9-pin Accessory Connector) is turned to High while the VOL/ PWR knob is s

48、et to the ON position (out of the click-stop position). Open: No Action RF Unit 17 Circuit Diagram (1) RX: 0 V TX: 5.5 V HIGH POWER: 3.3 V LOW POWER: 2.5 V HIGH POWER: 2.6 V LOW POWER: 1.0 V RX: 0 V TX: 1.6 V 9.0 V 3.8 V 3.8 V 3.8 V 3.8 V 3.8 V 0.7 V RX: 8.9 V TX: 8.2 V RX: 0 V TX: 8.9 V RX: 8.8 V T

49、X: 0 V RX: 0 V TX: 8.9 V RX: 0 V TX: 5.0 V RX: 5.0 V TX: 0 V 2.0 7.0 V RX: 0 V TX: 0.4 V RX: 0 V TX: 1.7 V RX: 0 V TX: 1.7 V RX: 1.0 V TX: 1.7 V 7.5 V 2.4 V 8.1 V 6.9 V RX: 4.6 V TX: 4.6 V RX: 4.6 V TX: 0 V RX: 3.8 V TX: 0 V RX: 2.3 V TX: 0 V RX: 0.4 V TX: 0 V RX: 8.7 V TX: 0 V 0 V 0.7 V 8.4 V 2.5 V 5.0 V 0 V 3.0 V 1.7 V 3.8 V 4.9 V RX: 0 V TX: 1.9 V RX: 0 V TX: 8.1 V RX: 0 V TX: 4.2 V RX: 0 V TX: 3.0 V RX: 0 V TX: 2.6 V RX: 4.3 V TX: 0 V 8.0 V 0.4 V 0.7 V 4.7 V WIDE: 0.4 V NARROW: 2.2 V WIDE: 2.3 V NARROW: 0 V WIDE: