Vertex_VX-2500U_serv.pdf

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1、1 UHF FM Transceiver VX-2500U Service Manual Introduction This manual provides technical information necessary for servicing the VX-2500U 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 dam- age 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 realig

5、nment 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 re- pair and alignment. Therefore, if a fault is suspected, c

6、on- tact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized Vertex Stan- dard service technicians realign all circuits and make com- plete performance checks to ensure compliance with fac- tory specifications after replacing any faulty components. Those

7、who do undertake 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 impro

8、ved performance, 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

9、 determined 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

10、most steps 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

11、 before beginning, and follow all of the steps in a section in the order presented. Required Test Equipment ? RF Signal Generator with calibrated output level at 1000MHz ? Deviation Meter (linear detector) ? In-line Wattmeter with 5% accuracy at 1000MHz ? 50 RF Dummy Load with power rating 100W at 1

12、000MHz ? 4 AF Dummy Load ? Regulated DC Power Supply (standard 13.8V DC, 15A) ? Frequency Counter with 0.1ppm accuracy at 1000MHz ? AC Voltmeter ? DC Voltmeter ? VHF Sampling Coupler ? IBM PC/compatible Computer ? Oscilloscope ? Vertex Standard VPL-1 Connection Cable & Alignment program Alignment Pr

13、eparation & Precautions 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- ter

14、mine whether 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

15、held constant 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.

16、Also, the test 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. 14 Setup the test equipment as shown below, apply 13.8V DC power to the transceiver. The transceiver must be programmed for use in

17、 the in- tended 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.

18、 ? Set the transceiver to the high band edge fre- quency channel, then adjust coil L1017 on the Unit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1, DS1) on the voltmeter. ? Key the transmitter, and adjust coil L1020 on the Unit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1, DS1) on the voltmeter. ?

19、Next select to the low edge frequency channel and confirm above 0.80V to 1.50V on the voltme- ter. ? Key the transmitter, and confirm above 1.00V to 1.60V on the voltmeter. PLL Reference Frequency With the wattmeter, dummy load and frequency counter connected to the antenna jack, and select band cen

20、ter fre- quency channel, key the transmitter and adjust TC1001 (Lot. 15) or VR1001 (Lot. 6) on the RF-Unit, if neces- sary, so the counter frequency is within 100 Hz of the chan- nel center frequency for the transceiver version. Alignment Important In order to facilitate alignment over the complete

21、switch- ing range of the equipment it is recommended that the channel data in the transceiver is preset as the chart be- low. CHANNEL CH 1 CH 2 CH 3 CH 4 CHANNEL SPACE Wide Narrow Wide Narrow Ver. CS1 435.100 MHz 435.100 MHz 400.100 MHz 459.900 MHz Ver. D 470.100 MHz 470.100 MHz 450.100 MHz 489.900

22、MHz FREQUENCY (SIMPLEX) 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 tool program running on PC. RF U

23、nit Test & Alignment Points (Lot. 15) TP1007 L1017 L1020 TC1001 Ver. DS1 485.100 MHz 485.100 MHz 450.100 MHz 519.900 MHz 15 The alignment tool outline Enter to the alignment mode To enter the alignment mode, turn the receiver off, select Radio then Alignment parameter on Clone Editor CE52. You turn

24、off the power of the transceiver, and turn on the transceiver. When the command has been suc- cessful, a message on the computer screen will confirm that the transceiver is now in the alignment mode. Alignment Sequence Although the data displayed on the computer screen dur- ing alignment is temporar

25、y data, it is important you fol- low the basic alignment sequence precisely, so that the displayed data and the data loaded into the transceiver are identical. Basic Alignment Sequence 1. Enter the alignment mode 2. Upload data from transceiver 3. Align data 4. Download data to transceiver Menu of t

26、he tool TX Power (High) This parameter is used to align TX High power. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window previously. Alignment RF Unit Test & Alignment Points (Lot. 6) TP1007 L1017 L1020 VR1001 ? To adjustment click the left mouse bu

27、tton on the Power High then Start button. 16 ? Move the Slide bar, as needed, to set the power output to the following specification, as indicated on the external wattmeter. TX Power (High): 25W (0.5W) ? When the 25Watt level is attained, press the OK box to lock in the new data. ? To adjustment cli

28、ck the left mouse button on the Power Low then Start button. Alignment TX Power (Low) This parameter is used to align TX Low power. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window previously. ? When the 5Watt level is attained, press the OK box to

29、 lock in the new data. Max Deviation This parameter is used to align Max Deviation. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window previously. ? Adjust the AF generator output level to 39mVrms(-26dBm) at 2 kHz to the pin3 of the J1502 (D-sub 9pin

30、). ? To adjustment click the left mouse button on the Maximum deviation then Start button. ? Move the Slide bar, as needed, to set the power output to the following specification, as indicated on the external wattmeter. TX Power (Low): 5W (0.1W) 17 Alignment ? Move the Slide bar, as needed, to set t

31、he Max Deviation (Wide) to the following specification, as indicated on the deviation meter. Max Deviation (Wide): 2.8kHz(0.1kHz) ? When the desired deviation level is attained, press OK to lock in the new data. ? Set the transceiver to CH#2, and set the Max De- viation (Narrow) to the following spe

32、cification, as indicated on the deviation meter. Max Deviation (Narrow): 1.4kHz(0.1kHz) ? When the desired deviation level is attained, press OK to lock in the new data. Modulation balance This parameter is used to align Modulation balance. ? Set the transceiver to CH#1 via the Channel box located u

33、pper right corner on the Alignment window previously. ? To adjustment click the left mouse button on the Modulation balance then Start button. ? Move the Slide bar, as needed, to set the modula- tion (Wide) wave as follows. ? When the desired the modulation wave is at- tained, press OK to lock in th

34、e new data. ? Set the transceiver to CH#2, and set the modula- tion (Narrow) wave as follows. ? When the desired deviation level is attained, press OK to lock in the new data. OKNGNG ? Adjust the AF generator output level to 774mVrms(0dBm) at 300Hz to the pin3 of the J1502 (D-sub 9pin). 18 CTCSS Mod

35、ulation This parameter is used to align CTCSS deviation. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window previously. ? To adjustment click the left mouse button on the CTCSS deviation then Start button. ? Move the Slide bar, as needed, to set the

36、CTCSS deviation (Wide) to the following specification. CTCSS Deviation(Wide): 0.70kHz(0.1kHz) ? When the desired deviation level is attained, press OK to lock in the new data. DCS Modulation This parameter is used to align DCS deviation. ? Set the transceiver to CH#1 via the Channel box located uppe

37、r right corner on the Alignment window previously. ? To adjustment click the left mouse button on the DCS deviation then Start button. ? Move the Slide bar, as needed, to set the DCS deviation (Wide) to the following specification. DCS Deviation(Wide) : 0.80kHz(0.1kHz) ? When the desired deviation l

38、evel is attained, press OK to lock in the new data. ? Set the transceiver to CH#2, and set the CTCSS deviation (Narrow) to the following specification. CTCSS Deviation(Narrow): 0.35kHz(0.1kHz) ? When the desired deviation level is attained, press OK to lock in the new data. ? Set the transceiver to

39、CH#2, and set the DCS de- viation (Narrow) to the following specification. DCS Deviation(Narrow): 0.40kHz(0.1kHz) ? When the desired deviation level is attained, press OK to lock in the new data. Alignment 19 RX Tune This parameter is used to RX Tune. ? Set the transceiver to CH#1 via the Channel bo

40、x located upper right corner on the Alignment window previously. ? Set the SG output level to -4dB EMF with 3kHz deviation. ? To adjustment click the left mouse button on the RX Tune then Start button. ? Move the Slide bar, as needed, to set the mini- mum level for Receiver Noise Level bar. ? When t

41、he desired RX Tune is attained, press OK to lock in the new data. Tight Noise SQL This parameter is used to Tight Noise SQL. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window previously. ? Set the SG output level to 0dB EMF with 3.0kHz deviation. ?

42、To adjustment click the left mouse button on the Tight Noise SQL then Start button. ? Press OK to lock in the new data. Alignment 20 ? Set the transceiver to CH#2 via the Channel box located upper right corner on the Alignment window previously. ? Set the SG output level to 0dB EMF with 1.5 kHz devi

43、ation. ? To adjustment click the left mouse button on the Tight noise SQL then Start button. ? Press OK to lock in the new data. Threshold Noise SQL This parameter is used to Threshold noise SQL. ? Set the transceiver to CH#1 via the Channel box located upper right corner on the Alignment window pre

44、viously. ? Set the SG output level to -7dB EMF with 3kHz deviation. ? To adjustment click the left mouse button on the Threshold noise SQL then Start button. ? Press OK to lock in the new data. Alignment 21 ? Set the transceiver to CH#2 via the Channel box located upper right corner on the Alignment

45、 window previously. ? Set the SG output level to -7dB EMF with 1.5 kHz deviation. ? To adjustment click the left mouse button on the Threshold noise SQL then Start button. Alignment ? Press OK to lock in the new data. 22 Note 23 RF Unit Jumper Information JP1501 (JP1): Determine the output supply vo

46、ltage 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): Determine the Rx discriminator output character

47、istic 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- tor. Close: Filtered 300 Hz to 3.0 kHz (70

48、 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 signal (pin 7 of DSUB 9-pin Accessory Conne

49、c- 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 JP1508 (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 turn