Vertex Standard EVX-261 Service Manual

Vertex Standard EVX-261 Service Manual

Uhf digital/analog transceiver
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UHF Digital/Analog Transceiver
EVX-261
Service Manual
Introduction
This manual provides the technical information necessary for servicing the EVX-261 UHF Digi-
tal/Analog Transceiver.
Servicing this equipment requires expertise in handing surface-mount chip components. At-
tempts by non-qualifi ed persons to service this equipment may 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 board in this transceiver. Each side
of the board is referred to by the type of the majority of components installed on that side ("Side
A" or "Side B"). In most cases one side has only chip components (surface-mount devices), and
the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic
capacitors, ICs, etc.), or leaded components only.
As described in the pages to follow, the advanced microprocessor design of the EVX-261 Trans-
ceiver allows a complete alignment of this transceiver to be performed without opening the case
of the radio; all adjustments can be performed from the front panel, using the "Alignment Mode"
menu.
While we believe the information in this manual to be correct, Vertex Standard assumes no li-
ability 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 ap-
preciated.
This transceiver is assembled using Pb (lead) free solder, based on the RoHS specifi cation.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus.
The solder stated above utilizes the alloy composition required for compliance with the lead-free specifi cation, and
any solder with the above alloy composition may be used.
Specifi cations................................................................................................................................................................. 2
Exploded View & Miscellaneous Parts ....................................................................................................................... 4
Parts List ....................................................................................................................................................................... 5
Block Diagram .............................................................................................................................................................. 6
Circuit Description ....................................................................................................................................................... 7
Alignment ...................................................................................................................................................................... 8
Cloning ........................................................................................................................................................................ 16
Main Unit (FR028100D) Circuit Diagram .............................................................................................................. 17
EVX-261 UHF Digital/Analog Transceiver Service Manual
Vertex Standard LMR, Inc.
Important Note
Contents
©2016 Vertex Standard LMR, Inc.
EC137U90C
1

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Summary of Contents for Vertex Standard EVX-261

  • Page 1: Table Of Contents

    (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. As described in the pages to follow, the advanced microprocessor design of the EVX-261 Trans- ceiver allows a complete alignment of this transceiver to be performed without opening the case of the radio;...
  • Page 2: Specifi Cations

    –36 dBm @ < = 1 GHz, –30 dBm @> 1 GHz Conducted Spurious Emissions: FM Hum & Noise: 45 dB (25 kHz) 40 dB (12.5 kHz) Audio Distortion: <5% @ 1 kHz Specifi cations subject to change without notice or obligation. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 3 –36 dBm @ < = 1 GHz, –30 dBm @> 1 GHz Conducted Spurious Emissions: FM Hum & Noise: 45 dB (25 kHz) 40 dB (12.5 kHz) Audio Distortion: <5% @ 1 kHz Specifi cations subject to change without notice or obligation. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 4: Exploded View & Miscellaneous Parts

    VXSTD P/N DESCRIPTION QTY.  U07230227 PAN HEAD SCREW M2X3BSUS #2  U24110001 BIND HEAD TAPTITE-B 2X10  U44105001 PAN HEAD TAPTITE-B M2X5 Non-designated parts are available only as part of a designated assembly. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 5: Parts List

    NT2520SB 19.2MHZ H9501523 SHIELD CASE COVER (FET) RA125020A RING NUT (x2 psc) RA157250A PAN HEAD TAPTITE-B (x14 psc) M2X5 U44105001 When replace a chip fuse, use the part of the same type and value. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 6: Block Diagram

    VRF1 2V8 LP8725 Q1007 Q1016 RF 5V DVFS VRF2 2V8 S-80820CNMC TAR5S50U MICROPROCESSOR VMLAN 1V8 SW1 1V2 SWITCH Q1004 SW SENS RESET SW3 1V8 BATTERY RUM002N02 FUSE TERMINAL VOL/SW F1001 VR1001 3.15A BATT TYPE EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 7: Circuit Description

    2-3. Automatic Transmit Power Control The current detector Q1006-1 (AD8566ARM) detects the current of the fi nal amplifi er Q1012 (RQA0011DNS) and the driver amplifi er Q1020 (RQA0004PXDQS), and converts the current difference to the voltage difference. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 8: Alignment

    Because of the BTL (Bridged Trans Less) Amplifi er cir- specifi cations after replacing any faulty components. cuit used in the EVX-261, do not connect earth side of the speaker leads to chassis “ground”. Those who do undertake any of the following alignments are cautioned to proceed at their own risk.
  • Page 9: Test Setup

    MIC/SP Transceiver Coupler FRB-6 Inline Generator D-Sub 15-pin MIC IN Wattmeter Connector Battery Terminal CLONE Port CT-104A, CT-106, or CT-171 Power Supply Computer FIF-12 Deviation 7.5 VDC ( CE156 ) Meter Frequency Oscilloscope Counter EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 10 (ADJ Type) located at the bottom of the screen, as needed. Basic: “Low-edge / band center / high-edge” and se- lect the channel for alignment (Default). Single: Alignment value changes only on the selected channel. All Freq: Alignment value changes on all channels. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 11 Basic: “Low-edge / band center / high-edge” and se- lect the channel for alignment (Default). Single: Alignment value changes only on the selected channel. All Freq: Alignment value changes on all channels. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 12 (ADJ Type) located at the bottom of the screen, as needed. Basic: “Low-edge / band center / high-edge” and se- lect the channel for alignment (Default). Single: Alignment value changes only on the selected channel. All Freq: Alignment value changes on all channels. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 13 You may align the deviation level by any DCS code (default: 532) by changing the value of the “DCS Code” box located at the bottom of the screen, if needed. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 14 4. After getting the desired deviation, click the “PTT” but- ton or press the “SPACE” bar to stop transmitting. 5. Click the “OK” button to finish the MSK Deviation alignment and save the data. EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 15  OWNLOAD LIGNMENT ATA AND ROM THE LIGNMENT Press the “OK” button, then the Alignment Data will be downloaded (saved) to the transceiver and Exit from the Alignment Mode.  EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 16: Cloning

    Cloning The EVX-261 transceiver includes a convenient “Cloning” feature, which allows the programming data from one trans- ceiver to be transferred to another EVX-261. Here is the procedure for Cloning one transceiver’s data to another. 1. Turn both transceivers “off”.
  • Page 17: Main Unit (Fr028100D) Circuit Diagram

    0.015u R 1105 J24185331 J24185221 R 1138 J24189522 8.2k J24189005 J24189009 R 1139 R 1346 J24189489 R 1347 J24189489 R 1350 J24189487 R 1351 J24189487 R 1355 J24189070 R 1356 J24189070 R 1374 J24189523 EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 18 Main Unit ( FR028100D ) Circuit Diagram ( CONTROL Section ) EVX-261 UHF Digital/Analog Transceiver Service Manual...
  • Page 19 No portion of this manual may be reproduced without the per- mission of Vertex Standard LMR, Inc. Vertex Standard is a trademark of Vertex Standard LMR, Inc. All other trademarks are the property of their respective owners. ©2016 Vertex Standard LMR, Inc.

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