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UHF FM Transceiver
VX-146
Service Manual
©2003 VERTEX STANDARD CO., LTD.
Introduction
This manual provides technical information necessary for servicing the VX-146 FM Transceiver.
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 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 is referred to
by the type of the majority of components installed on that side ("leaded" 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 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
Block Diagram ............................................. 4
Circuit Description .................................... 5
EC041U90A
Contents
Alignment .................................................... 7
MAIN Unit Circuit Diagram ..................... 11
MAIN Unit Parts Layouts .......................... 13
MAIN Unit Parts List ................................. 15
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.
International Division
8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
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
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Summary of Contents for Vertex Standard VX-146
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Page 1: Table Of Contents
ICs, etc.), or leaded components only. While we believe the technical information in this manual to be correct, VERTEX 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. -
Page 2: Specifications
Specifications GENERAL Frequency Range: 446.00625 - 446.09375 MHz Number of Channels: 8 channels Channel Spacing: 12.5 kHz Emmission Type: Power Supply voltage: 7.5 VDC ± 10 % Operating Temperature Range: –20 °C to +55 °C Frequency Stability: ±2.5 ppm Antenna Impedance: 50 Ohms Dimensions (WHD): 58 x 120 x 31 mm... -
Page 3: Exploded View & Miscellaneous Parts
Exploded View & Miscellaneous Parts RA0210900 REF. VXSTD P/N Description Qty. WINDOW RA0413500 À U44104002 TAPTITE SCREW M2X4NI FRONT CASE ASSY Á U44104002 TAPTITE SCREW M2X4NI (with PTT KNOB and WINDOW) Â U20206007 BINDING HEAD SCREW M2.6X6B Â Ã U24110002 TAPTITE SCREW M2X10NI Â... -
Page 4: Block Diagram
Block Diagram... -
Page 5: Circuit Description
Circuit Description Receive Signal Path The resulting DC squelch control voltage is passed to pin Incoming RF from the antenna is delivered to the RF Unit 37 of the microprocessor Q1011 (M37515M6-121HP). If and passes through a low-pass filter consisting of coils no carrier is received, this signal causes pin 24 of Q1011 L1003, L1004 &... - Page 6 Circuit Description Automatic Transmit Power Control The data latch section of Q1004 also receives serial divid- Current from the final amplifier is sampled by R1120, ing data from the microprocessor Q1014, which causes R1121 and R1143, and is rectified by Q1032 (IMZ2A). The the pre-divided VCO signal to be further divided in the resulting DC is fed back through Q1035 (FMW1) to the programmable divider section, depending upon the de-...
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Page 7: Alignment
Alignment Introduction Required Test Equipment The VX-146 has been aligned at the factory for the speci- r Radio Tester with calibrated output level at 1 GHz fied performance across the entire frequency range speci- r In-line Wattmeter with 5% accuracy at 1 GHz fied. - Page 8 Alignment The alignment tool outline Set up the test equipment as shown below for transceiver alignment, and apply 7.5V DC power to the transceiver. Installation of the Alignment tool The “alignment mode” is a software-based protocol, ac- cessed by an “Alignment Mode” command from the com- 50-ohm Dummy Load puter while switching the transceiver on.
- Page 9 Alignment PLL VCV (Varactor Control Voltage) STD Deviation r Connect the DC voltmeter between TP1003 on the r Inject a 1 kHz tone at –37 CLONE GND Main Unit and ground. dBm to the MIC jack. r Set the transceiver to CH 4 via the “CH” box located r To adjustment, double-click the on the upper left corner on the “Alignment”...
- Page 10 Alignment Note:...
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Page 11: Main Unit Circuit Diagram
MAIN Unit Circuit Diagram TX: 0 V TX: 0 V TX: 0 V RX: 1.71 V RX: 2.94 V RX: 0.76 V TX: 0 V RX: 0.73 V 0.45 V 0.80 V TX: 5.09 V TX: 4.88 V 5.03 V 5.07 V TX: 0.77 V TX: 3.64 V... - Page 12 Note...
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Page 13: Main Unit Parts Layouts
MAIN Unit Parts Layout Side A LC75834W NJM2070M FMW1 (W1) CPH6102 (AB) 2SC4154E (LE) RT1N441U (N3) MC2850 (A7) 12-22SURSYGC/S530-A2/TR8 (Q1027) (Q1041) (Q1035) (Q1043) (Q1006, 1016 (Q1040) (D1018) (D1012) 1023, 1037) NJM2406F IMZ2 (Z2) 2SK2035 (KP) 2SA1602A (MF) DTC124TE (25) FA1101F (Q1039) (Q1032) (Q1009) - Page 14 MAIN Unit Parts Layout Side B M37516E6HP TA31136FN BR93LC66FV 2SK508 (K52) 2SK2974 2SC4154E (LE) CPH6102 (AB) FMW1 (W1) RT1P441U (P3) DAN235E (M) 2SA1602A (MF) (Q1011) (Q1045) (Q1010) (Q1003) (Q1022) (Q1008, 1025) (Q1021, 1029) (Q1018, 1028) (Q1014) (D1009) (Q1005, 1026) 2SC4215Y (QY) (Q1034) 2SC5005 (73) (Q1007)
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Page 15: Main Unit Parts List
MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR PCB with Components CB2039001 Printed Circuit Board AC041N000 FR0084000 C 1002 CHIP CAP. 100pF UMK105CH101JW-F K22178282 C 1003 CHIP CAP. 220pF TMK105CH221JW-F K22148246 C 1004 CHIP CAP. - Page 16 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1080 CHIP CAP. 0.001uF UMK105B102KW-F K22178829 C 1081 CHIP CAP. UMK105CH040CW-F K22178252 C 1083 CHIP CAP. UMK105CH050CW-F K22178253 C 1084 CHIP CAP. UMK105CH090DW-F K22178257 C 1086 CHIP CAP.
- Page 17 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR C 1169 CHIP CAP. 0.001uF UMK105B102KW-F K22178829 C 1170 CHIP CAP. 10pF UMK105CH100DW-F K22178258 C 1171 CHIP CAP. 10pF UMK105CH100DW-F K22178258 C 1174 CHIP CAP. 0.001uF UMK105B102KW-F K22178829...
- Page 18 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR D 1013 FA1101F-TR G2070842 D 1014 FA1101F-TR G2070842 D 1015 DIODE 1SS400 TE61 G2070634 D 1017 DIODE MC2850-T11-1 G2070704 D 1018 DIODE MC2850-T11-1 G2070704 D 1019 DIODE 1SS400 TE61...
- Page 19 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR Q 1033 S-80835CNMC-B8U-T2 G1093606 Q 1034 TRANSISTOR 2SC4215Y TE85R G3342157Y Q 1035 TRANSISTOR FMW1 T98 G3070009 Q 1036 TRANSISTOR 2SA1602A-T11-1F G3116028F Q 1037 TRANSISTOR 2SC4154-T11-1E G3341548E Q 1039...
- Page 20 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1066 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1067 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1068 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1069 CHIP RES.
- Page 21 MAIN Unit Parts List DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR R 1149 CHIP RES. 1/16W RMC1/16S 220JTH J24189005 R 1150 CHIP RES. 1/16W RMC1/16S 391JTH J24189020 R 1151 CHIP RES. 1/16W RMC1/16S 473JTH J24189045 R 1152 CHIP RES.
- Page 22 MAIN Unit Parts List Note DESCRIPTION VALUE TOL. MFR'S DESIG VXSTD P/N VERS. LOT SIDE LAY ADR...
- Page 24 Copyright 2003 VERTEX STANDARD CO., LTD. All rights reserved No portion of this manual may be reproduced without the permission of VERTEX STANDARD CO., LTD.