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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.
VHF FM Transceiver
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
VX-2500V
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
Service Manual
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Cen
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Specifications General Frequency range: 134-160 MHz (Type A) 148-174 MHz (Type C) Number of Systems: 32 Number of Groups: 250 Number of Channels : 250 channels (Conventional) 640 channels (Trunking) PLL Steps: 5.0 kHz/6.25kHz Power Supply Voltage: 13.8V DC ±15 % Channel Spacing: 12.5 / 25.0 kHz Current Consumption (Approx.): TX: 6 A RX: 700 mA STBY: 250 mA Operating Temperature range: –22 °F to 140 °F (–30 °C to +60 °C) Frequency Stability: Better than ±2.5 ppm RF Input-Output Impedance: 50 ohm
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DSUB 9-pin Accessory Connector Pin 1: Output Logic squelch High: Radio receiving the signal with the correct CTCSS, DCS, or LTR ID. Low: Radio not receiving the signal with the correct CTCSS, DCS, or LTR ID. Pin 2: Output Rx discriminator JP3 (JP1503) - Flat: 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination) or JP4 (JP1504) - Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination) * Note: JP3 is closed from the factory, and JP4 is not closed from the fa
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Exploded View & Miscellaneous Parts REF. VXSTD P/N DESCRIPTION QTY. U20206002 BINDING HEAD SCREW M2.6 x 6 NI 1 U20306002 BINDING HEAD SCREW M3 x 6 NI 2 U20308002 BINDING HEAD SCREW M3 x 8 NI 2 U24306002 TAPTITE SCREW M3 x 6 NI 4
U24308001 TAPTITE SCREW M3 x 8 1 U31206007 OVAL HEAD SCREW M2.6 x 6 B 7 BLIND SEET (70 x 10) CASE RA0365500 RA0060100 CONNECTOR P1090654 WIRE ASSY T9206634A
SUPPORT MAIN UNIT RA0060700 SPONGE RUBBER (SHIELD) RA0365500 SHIELD GASKET S50
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Block Diagram (1) 5
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Block Diagram (2) 6
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Interconnection Diagram 7
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Note 8
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Circuit Description and audio low-pass filter. After volume adjustment by 1. Overview Q2014 (M62364FP), the audio signal is amplified by the The VX-2500V is a VHF FM mobile transceiver designed AF power amplifier Q1509 (TDA2003H) and passed to to operate in the frequency range of 134 to 174MHz. speaker jack. 2. Circuit Configuration by Frequency 4. Transmit Signal Path The receiver is a double-conversion superheterodyne with Voice audio from the microphone is delivered via the MIC a first inter
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Circuit Description The output of the VCO is amplified by the Q1020 and rout- 7. Power Supply Circuits ed to the pin 5 of the PLL IC. Also the output of the VCO 7-1 All 13.8V is amplified by the Q1021 and routed first local/Power 13.8V is always supplied to Power AMP Q1014 Module according to D1022. (RA30H4452M). Switched 13.8V is supplied to AF Power The PLL IC consists of a prescaler, fractional divider, ref- AMP Q1509 (TDA2003H) and 9V Regulator Q1004 erence divider and phase comparator and c
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Alignment Introduction Required Test Equipment The VX-2500V is carefully aligned at the factory for the r RF Signal Generator with calibrated output level specified performance across the frequency range speci- at 500MHz fied for each version. Realignment should therefore not r Deviation Meter (linear detector) be necessary except in the event of a component failure, r In-line Wattmeter with 5% accuracy at 1000MHz or altering version type. All component replacement and r 50W RF Dummy Load with p
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Alignment Setup the test equipment as shown below, apply 13.8V PLL VCV DC power to the transceiver. ¦ Connect the positive lead of the DC voltmeter to The transceiver must be programmed for use in the in- the test point TP1007 (VCV) on the RF-Unit, as tended system before alignment is attempted. The RF pa- indicated in the figure, and the negative lead to rameters are loaded from the file during the alignment chassis ground. process. ¦ Set the transceiver to the high band edge fre- quency channe
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Alignment The alignment tool outline Menu of the tool Installation the tool [0] Common TX This alignment tool consists, MS-DOS based, only one ex- - [0] Tx Power High ecute file “svc47.exe.“ You make a directly as you think This parameter is used to align TX High power (25W). fit, and copy this file. That is all of the installation pro- ¦ Press [Enter] on “[0] Tx Power High” to align cess. TX High power. Boot the tool ¦ Select the Channel “1“ in alignment range. Change directly and input in comm
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Alignment - [3] REF Deviation - [5] DCS Deviation This parameter is used to align the REF Deviation. This parameter is used to align the DCS deviation. ¦ Press [Enter] on “[3] REF Deviation” to align REF ¦ Press [Enter] on “[5] DCS Deviation” to align Deviation. DCS Deviation. ¦ Select the Channel “1“ in alignment range. ¦ Select the Channel “1“ in alignment range. ¦ Adjust the AF generator output level to ¦ Press the [Space] key on the keyboard to acti- 776mVrms(0dBm) at 300Hz to the pin 3 of t
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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 channel 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 level to –7
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RF Unit Jumper Information JP1501 (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): Determine 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 terminat
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RF Unit Circuit Diagram (1) RX: 0 V TX: 1.6 V WIDE: 0 V NARROW: 5.0 V RX: 0 V TX: 1.9 V HIGH POWER: 0 V LOW POWER: 0 V RX: 0 V HIGH POWER: 2.6 V RX: 0 V 0.8 ~ 2.3 V TX: 5.5 V LOW POWER: 1.0 V TX: 8.1 V 3.9 V 1.0 V 4.1 V RX: 0 V 5.0 V TX: 3.0 V RX: 0 V TX: 2.6 V 4.7 V 4.6 V 1.1 V RX: 0 V RX: 0 V RX: 0 V TX: 7.6 V TX: 1.5 V TX: 4.2 V 4.1 V 0.6 V 6.9 V 8.0 V WIDE: 2.3 V RX: 4.3 V NARROW: 0 V HIGH POWER: 3.3 V TX: 0 V WIDE: 1.8 V LOW POWER: 2.5 V NARROW: 1.6 V 0.4 V 8.1 V 7.5 V 2.4 V RX: 1.0 V WIDE:
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RF Unit Circuit Diagram (2) 4.8 V 2.2 V 1.2 V 0.7 V 1.3 V RX WIDE: 0.2 ~ 3.8 V RX NARROW: 0.2 ~ 3.5 V TX: 0.2 V RX WIDE: 0.8 ~ 3.8 V RX NARROW: 0.8 ~ 3.1 V RX: 0.3 V TX: 0.8 V TX: 0 V 3.7 V RX WIDE: 0.3 ~ 5.6 V RX NARROW: 0.3 ~ 5.1 V TX: 0.3 V 8.5 V 3.7 V 3.7 V 3.7 V 1.2 V 3.7 V 3.7 V 0.7 V 0.8 V 3.7 V 3.7 V HORN OFF: 0 V HORN ACTIVE: 5.0 V 13.8 V 1.3 V HORN OFF: 8.9 V HORN ACTIVE: 8.3 V 1.6 V 13.1 V HORN OFF: 8.9 V 7.3 V HORN ACTIVE: 0 V 0.9 V 0.8 V 5.3 V 0 V HORN OFF: 0 V BUSY: 0 V HORN ACTIVE
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RF Unit Parts Layout (Side A) A B C D E F G H 1 2 3 4 TDA2003H SA7025DK NJM2902V M5223 2SA1602A (MF) 2SB1301 (ZQ) 2SC4154 (LE) 2SK508 (K52) 3SK228 (XR) IMH6A (H6) RT1N241M (N2) HSM88AS (C1) (Q1509) (Q1023) (Q1003, 1503) (Q1019) (Q1505) (Q1511) (Q1501) (Q1013) (Q1026) (Q1017) (Q1002, 1006, (D1011, 1012) 1016, 1032, 1033, 2SD1368CB (CB) 2SC4226 (R22) MC2850 (A7) 1034, 1035, 1502, (Q1504) (Q1011, 1015) (D1506, 1507) 1506, 1507, 1512, 2SC5107 (MF0) 1518) (Q1518) 19
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RF Unit Parts Layout (Side B) g a c e b d f h 1 1SS321 (F9) (D1022) MC2848 (A6) (D1024, 1026) 2 MC2850 (A7) (D1501, 1502, 1503) RT1N241M (N2) (Q1012, 1030, 1516, 1517) 3 PDTC114TE (24) 4 (Q1508, 1510) RA30H1317M TA31136FN 2SB1201S 2SA1602A (MF) 2SB1132 (BA) 2SC4116 (LG) 2SC5415E (EA) 2SJ125D (JD) DTB123EK (F12) IMH6A (H6) MM1216ENRE NJM78L05 (Q1014) (Q1028) (Q1031) (Q1009) (Q1001) (Q1022) (Q1515) (Q1008) (Q1010) (Q1004) (Q1024) (Q1005) 2SC4154 (LE) (Q1007, 1519) 2SC4215Y (QY) (Q1029) 2SC5107 (MF
