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Vertex Standard VX-424A Series Service Manual

Vhf fm transceiver
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VHF FM Transceiver
VX-424A (LTR
Service Manual
©
2009 VERTEX STANDARD CO., LTD.
16 key Version
This transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this appara-
tus. The solder stated above utilizes the alloy composition required for compliance with the lead-free specification,
and any solder with the above alloy composition may be used.
Specifications ..........................................................2
Block Diagram ......................................................... 5
Circuit Description ................................................7
Alignment ................................................................9
®
)
Series
EC071N95C
Introduction
This manual provides technical information necessary for ser-
vicing the VX-424A (LTR
Servicing this equipment requires expertise in handling surface-
mount chip components. Attempts by non-qualified persons to
service this equipment may result in permanent damage not cov-
ered 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 is referred to by the
type of the majority of components installed on that side ("lead-
ed" or "chip-only"). In most cases one side has only chip com-
ponents, and the other has either a mixture of both chip and lead-
ed components (trimmers, coils, electrolytic capacitors, ICs, etc.),
or leaded components only.
While we believe the technical information in this manual to be
correct, VERTEX STANDARD assumes no liability for dam-
age that may occur as a result of typographical or other errors
4 key Version
that may be present. Your cooperation in pointing out any in-
consistencies in the technical information would be appreciated.
Important Note
Contents
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
VERTEX STANDARD ( AUSTRALIA ) PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia
) Series FM Transceiver.
®
LTR
is a registered trademark of E.F Johnson Company.
®
Board Unit (Schematics, Layouts & Parts)
MAIN-2 Unit ............................................................ 25
DUMMY Unit .......................................................... 47
Optional Units (Schematics, Layouts & Parts)
1

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Summary of Contents for Vertex Standard VX-424A Series

  • Page 1: Table Of Contents

    (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. While we believe the technical information in this manual to be correct, VERTEX STANDARD assumes no liability for dam- age that may occur as a result of typographical or other errors 16 key Version 4 key Version that may be present.

  • Page 2: Specifications

    Specifications General Frequency Range: 146-174 MHz Number of Systems: Number of Groups: Channel Spacing: 12.5 / 25 kHz PLL Steps: 5 / 6.25 kHz Power Supply voltage: 7.5 VDC ± 10% Operating Temperature Range: –22°F to +140°F (–30°C to +60°C) Frequency Stability: ±2.5 ppm Dimensions (WHD):...

  • Page 3: Exploded View & Miscellaneous Parts

    Exploded View & Miscellaneous Parts RA0545500 CP8731001 WINDOW FRONT CASE ASSY (16 key) (W/ LIGHT GUIDE, NAME PLATE, SP NET, SPEAKER, PACKING PAD, RA0545300 PTT KNOB, SHEET(MIC), CR SPONGE RUBBER, WINDOW ASSY) DOUBLE FACE TAPE (LCD) RA0173500 R6147510 RING NUT (x 2 pcs) RA0810500 KNOB ASSY (256CH) CP8731002...
  • Page 4 Note...

  • Page 5: Block Diagram

    Block Diagram...
  • Page 6 Note...

  • Page 7: Circuit Description

    Circuit Description Receive Signal Path The resulting DC squelch control voltage is passed to Incoming RF from the antenna jack is delivered to the pin 19 of the microprocessor Q2047 (LC87F74C8A). If MAIN-2 Unit and passes through a low-pass filter con- no carrier is received, this signal causes pin 19 of Q2047 sisting of coils L2002, and L2003, capacitors C2001, to go high and pin 30 to go low.
  • Page 8 Circuit Description fier Q2020 (2SC3357), driver amplifier Q2014 section of Q2042, before being sent to the programmable (RD01MUS1), and then the amplified transmit signal is divider section of Q2042. applied to the final amplifier Q2008 (RD07MVS1), which The data latch section of Q2042 also receives serial delivers up to 5 watts of output power.

  • Page 9: Alignment

    Note: Signal levels in dB referred to in this procedure are by the warranty policy. Also, Vertex Standard must re- based on 0 dBμ = 0.5 μV (closed circuit). serve the right to change circuits and alignment proce- dures in the interest of improved performance, without notifying owners.
  • Page 10 Alignment Set up the test equipment as shown below for trans- PLL VCV (Varactor Control Voltage) ceiver alignment, and apply 7.5V DC power to the trans- Connect the DC voltmeter between TP2045 on the ceiver. Main Unit and ground. Set the transceiver to CH 4 (high band edge), and ad- Power Supply just L2036 on the Main Unit for 4.0 V ±...
  • Page 11 Alignment The Alignment Tool Outline Reference Frequency Install the VX-424A Programming Software to your Set the transceiver to CH 1 (band center) via the “Chan- nel” box on the “Alignment” window previously. Execute the VX-424A Programming Software. Click the left mouse button on the “Reference Fre- Click the left mouse button on the “Radio”...
  • Page 12 Alignment Transmitter Output Power Set the transceiver to CH 1 (band center) via the “Chan- Click the left mouse button on the “Power Low” but- ton. nel” box on the “Alignment” window previously. Click the left mouse button on the “Power High” but- Click the left mouse button on the “Start”...
  • Page 13 Alignment Max Deviation Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 2 (band center, narrow de- viation) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 14 Alignment CTCSS Deviation Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 2 (band center, narrow de- viation) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 15 Alignment Modulation Balance Note: Do not apply the microphone input in this adjust- Set the transceiver to CH 2 (band center, narrow de- viation) via the “Channel” box on the “Alignment” win- ment. Set the transceiver to CH 1 (band center, wide devia- dow.
  • Page 16 Alignment DCS Deviation Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 2 (band center, narrow de- viation) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 17 Alignment LTR Deviation Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 2 (band center, narrow de- viation) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 18 Alignment Sequential Tone Deviation STD Deviation Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 1 (band center, wide devia- tion) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 19 Alignment RX Tune ( Sensitivity ) Tight Noise Squelch Set the transceiver to CH 1 (band center, wide devia- Set the transceiver to CH 1 (band center, wide devia- tion) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow previously.
  • Page 20 Alignment Threshold Noise Squelch Set the transceiver to CH 2 (band center, narrow de- Set the transceiver to CH 1 (band center, wide devia- viation) via the “Channel” box on the “Alignment” win- tion) via the “Channel” box on the “Alignment” win- dow.
  • Page 21 Alignment Tight Noise Squelch RSSI Set the transceiver to CH 2 (band center, narrow de- Set the transceiver to CH 1 (band center, wide devia- viation) via the “Channel” box on the “Alignment” tion) via the “Channel” box on the “Alignment” win- window.
  • Page 22 Alignment TX Save RSSI Set the transceiver to CH 2 (band center, narrow de- Set the transceiver to CH 1 (band center, wide devia- viation) via the “Channel” box on the “Alignment” tion) via the “Channel” box on the “Alignment” win- window.
  • Page 23 Alignment Set the transceiver to CH 2 (band center, narrow de- This completes the alignment routine. Press the “Exit” box viation) via the “Channel” box on the “Alignment” win- to save all settings and close the “Alignment” window, dow. then turn the radio off. Tune the RF output of the Radio Tester to 160.100 MHz, then set the output level to +15 dBμ...
  • Page 24 Note...

  • Page 25: Main-2 Unit

    MAIN-2 Unit (Lot. 1 ~ 5) Circuit Diagram...
  • Page 26 MAIN-2 Unit (Lot. 1 ~ 5) Note...
  • Page 27 MAIN-2 Unit (Lot. 1 ~ 5) Parts Layout (Side A) BR93L86RFVM-WTR 2SA1602A (MF) BD4835FVE (DR) DTA144EE (16) IMZ2A (Z2) LMV321IDCKR (R3x) 12-22SURSYGC/S530-A2/TR8 (Q2036) (Q2004, 2066) (Q2040) (Q2039) (Q2003) (Q2064) (D2039) NJM12904R (Q2054) LC87F7BC8A (Q2047) NJM2070M 2SC4154E (LE) CPH6102 (AB) DTC114TE (04) UMX1N (X1) DA221 (K) (Q2005)
  • Page 28 MAIN-2 Unit (Lot. 1 ~ 5) Parts Layout (Side B) HSM88AS (C1) (D2049) DAN222 (N) (D2044, 2045) DA221 (K) (D2036) NJM2871AF35 AK2342BP TA31136FN TC7W74FU TC4S66F (C9) RD01MUS1 2SA1602A (MF) 2SC4154E (LE) CPH6102 (AB) DTB123EK (F12) DTC124TE (05) UMX1N (X1) (Q2021) (Q2048) (Q2057) (Q2065)
  • Page 29 MAIN-2 Unit (Lot. 6 ~) Circuit Diagram...
  • Page 30 MAIN-2 Unit (Lot. 6 ~) Note...
  • Page 31 MAIN-2 Unit (Lot. 6 ~) Parts Layout (Side A) BR93L86RFVM-WTR 2SA1576A (F) BD4835FVE (DR) DTA144EE (16) IMZ2A (Z2) LMV321IDCKR (R3x) LTST-S326KGJRKT (Q2036) (Q2004, 2066) (Q2040) (Q2039) (Q2003) (Q2064) (D2039) NJM12904R (Q2054) LC87F7BC8A (Q2047) NJM2070M 2SC4081 (B) CPH6102 (AB) DTC114TE (04) UMX1N (X1) DA221 (K) (Q2005)
  • Page 32 MAIN-2 Unit (Lot. 6 ~) Parts Layout (Side B) HSM88AS (C1) (D2049) DAN222 (N) (D2044, 2045) DA221 (K) (D2036) NJM2871AF35 AK2342BP TA31136FN TC7W74FU TC4S66F (C9) RD01MUS1 2SA1576A (F) 2SC4081 (B) CPH6102 (AB) DTB123EK (F12) DTC124TE (05) UMX1N (X1) (Q2021) (Q2048) (Q2057) (Q2065) (Q2014)
  • Page 33 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR PCB with Components CS1929001 16 KEY, IS: OFF CS1929002 4 KEY, IS: OFF CS1929003 16 KEY, IS: ON CS1929004 4 KEY, IS: ON Printed Circuit Board FR015750B Printed Circuit Board...
  • Page 34 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR C 2072 CHIP CAP. 0.1uF GRM155B11A104KA01D K22108802 C 2073 CHIP CAP. 6.3V GRM188B10J105KA01D K22084801 C 2074 CHIP TA.CAP. 4.7uF TEESVA1C475M8R K78120031 C 2075 CHIP TA.CAP.
  • Page 35 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR C 2135 CHIP CAP. 0.01uF GRM155B11E103KA01D K22148834 C 2136 CHIP CAP. 0.1uF GRM155B11A104KA01D K22108802 C 2137 CHIP CAP. 0.1uF GRM155B11A104KA01D K22108802 C 2138 CHIP CAP.
  • Page 36 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR C 2200 CHIP CAP. 12pF GRM1552C1H120JZ01D K22178214 C 2201 CHIP CAP. 0.01uF GRM36B103K16PT K22128804 C 2201 CHIP CAP. 0.01uF GRM155B11E103KA01D K22148834 C 2203 CHIP CAP.
  • Page 37 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR C 2268 CHIP CAP. 470pF GRM155B11H471KA01D K22178805 C 2269 CHIP CAP. 0.01uF GRM36B103K16PT K22128804 C 2269 CHIP CAP. 0.01uF GRM155B11E103KA01D K22148834 C 2270 CHIP CAP.
  • Page 38 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR D 2023 DIODE HVD372B KRF-E G2070966 D 2024 DIODE HVD372B KRF-E G2070966 D 2026 DIODE HVD358B KRF-E G2070950 D 2027 LNJ808K8SRA G2070790 D 2028 LNJ808K8SRA G2070790 16KEY...
  • Page 39 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR L 2024 M.RFC 3.3uH LK1608 3R3K-T L1690686 L 2025 COIL E2 0.3-1.7-7T-R L0022372 L 2026 CHIP COIL 15uH LQH32MN150K23L L1690089 L 2027 M.RFC 0.068uH HK1608 68NJ-T L1690526...
  • Page 40 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR Q 2044 TRANSISTOR 2SC4081 T106 R G3340818R Q 2045 TRANSISTOR 2SC4154-T111-1E G3341548E Q 2045 TRANSISTOR 2SC4081 T106 R G3340818R Q 2046 TRANSISTOR DTC114TE TL G3070225 Q 2047 LC87F7BC8A-F56G2-E...
  • Page 41 – Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR R 2048 CHIP RES. 4.7k 1/16W 5% RMC1/16S 472JTH J24189033 R 2049 CHIP RES. 1/16W 5% RMC1/16S JPTH J24189070 R 2050 CHIP RES. 100k 1/16W 5% RMC1/16S 104JTH J24189049...
  • Page 42 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR R 2116 CHIP RES. 220k 1/16W 5% RMC1/16S 224JTH J24189053 R 2117 CHIP RES. 270k 1/16W 5% RMC1/16S 274JTH J24189054 R 2118 CHIP RES. 1/16W 5% RMC1/16S 473JTH J24189045...
  • Page 43 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR R 2182 CHIP RES. 1.2k 1/16W 5% RMC1/16S 122JTH J24189026 R 2183 CHIP RES. 1/16W 5% RMC1/16S 271JTH J24189018 R 2184 CHIP RES. 1.2k 1/16W 5% RMC1/16S 122JTH...
  • Page 44 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR R 2250 CHIP RES. 1/16W 5% RMC1/16S 102JTH J24189025 R 2251 CHIP RES. 1/16W 5% RMC1/16S 102JTH J24189025 R 2252 CHIP RES. 1/16W 5% RMC1/16S 102JTH J24189025 R 2253...
  • Page 45 MAIN-2 Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR R 2327 CHIP RES. 1/16W 5% RMC1/16S 101JTH J24189013 R 2329 CHIP RES. 220k 1/16W 5% RMC1/16S 224JTH J24189053 R 2330 CHIP RES. 1/16W 5% RMC1/16S 221JTH J24189017...
  • Page 46 MAIN-2 Unit Note...

  • Page 47: Dummy Unit

    DUMMY Unit Circuit Diagram Parts Layout Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR PCB with Components CB3779001 Printed Circuit Board FR002510D C 4001 CHIP CAP. 0.0018uF GRM39B182M50PT K22174812 C 4002 CHIP CAP. 0.1uF GRM39B104K16PT K22124805...

  • Page 48: Fvp-25 Encryption / Dtmf Pager Unit

    FVP-25 Encryption / DTMF Pager Unit Circuit Diagram Parts Layout Side A Side B M64026FP LC73881 DTC144EU (26) (Q1001) (Q1002) (Q1003)
  • Page 49 FVP-25 Encryption / DTMF Pager Unit Parts List REF. DESCRIPTION VALUE TOL. MFR’S DESIG VXSTD P/N VERS. LOT. SIDE LAY ADR *** FVP-25 *** Printed Circuit Board FR005010F C 1001 CHIP CAP. 0.1uF GRM39B104K16PT K22124805 C 1002 CHIP CAP. 0.01uF GRM39B103M25PT K22144802 C 1003 CHIP CAP.
  • Page 50 Copyright 2009 VERTEX STANDARD CO., LTD. All rights reserved No portion of this manual may be reproduced without the permission of VERTEX STANDARD CO., LTD.

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Vx-424a ltr series