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Make/Model Information:

  • Brand:   Yaesu
  • Models included:
    • Yaesu VX-2500U

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   79
  • File size:  ∼ 6.70 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROYA-0034

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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 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 thr board 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 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
DSUB 9-pin Accessory Connector
Exploded View & Miscellaneous Parts
Block Diagram
Interconnection Diagram
Circuit Description
Contents
Alignment
RF Unit Jumper Information
Board Unit (Schematics, Layouts & Parts)
RF Unit
RF-1- Unit
RF-2- Unit
Panel Unit
2004 VERTEX STANDARD CO., LTD.
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 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
General
Frequency range: 400-470 MHz (Ver. CS1)
450-490 MHz (Ver. D)
450-520 MHz (Ver. DS1)
Number of Groups: 10
Number of Channels : 128 channels
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 ohms
Audio Output Impedance: 4 ohms
Dimensions: 6.3 x 1.6 x 4.3 inch (160 x 40 x 110 mm)
Weight (Approx.): 1.87 lb (0.85 kg)
Receiver (Typical Values)
Circuit type: Double conversion Super-heterodyne
Sensitivity: 0.25 uV (12 dB SINAD)
Adjacent Channel Selectivity: 80/67 dB
Intermodulation: 75 dB
Spurious and Image Rejection: 90 dB
Audio Output: 4 W @ 4 ohms 5% THD
Audio Distortion: <3 % @1 kHz
Transmitter (Typical Values)
Power Output: 25 W (low: 5W)
Modulation: 16K0F3E, 11K0F3E
Max Deviation: 5.0/2.5 kHz
Conducted Spurious Emission: 70 dB below carrier
Audio Distortion: <3 % @ 1 kHz
Microphone type: Dynamic
Microphone impedance: 600 ohms
Specifications
DSUB 9-pin Accessory Connector
Pin 1: Output Logic squelch (Will be effective this output during Data transmission Inputting logic Low
level signal to the Pin #4 as the DTR signal)
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 (Need to set the solder short on the PCB)
JP3 (JP1503) - Flat: 10 Hz to 3.0 kHz (140 mVrms / STD deviation with 600 ohm termination)
JP4 (JP1504) - Filtered 300 Hz to 3.0 kHz (70 mVrms / STD deviation with 600 ohm termination)
* Both JP3 and JP4 are not closed from the factory.
Pin 3: Input TX data to the radio modulator. (Flat: 10 Hz to 3.0 kHz)
(40 mVrms / STD deviation)
Pin 4: Input DTR (to switch the radio operation between dispatch operation and Data mode)
[DTR Low: Turn on the Data transmission, less than 0.5 V]
[DTR High: Turn off the Data transmission, more than 4.0 V]
Pin 5: Ground
Pin 6: Output Horn alert signal (Open collector with maximum 16.0 V, 100 mA sink).
Pin 7: Input external PTT (effective when in the Data mode)
[Low: Request the transmission]
[High: Request the Receiving]
Pin 8: Output supply voltage (Need to set the solder short on the PCB)
JP1 (JP1501) Output 5.0 V (Maximum 100 mA output)
JP2(JP1502) Output 13.8 V (Maximum 100 mA output)
* Both JP1 and JP2 are not closed from the factory.
Pin 9: Input the ignition signal of the CAR.
This signal is for the following operation,
(1) Disable the Horn alert during the ignition is turned on.
(2) Turn on and off the radio. This function requires the solder short JP8 (JP1508).
Exploded View & Miscellaneous Parts
RA0060100
SHIELD GASKET (Ver. D)
S5000238
SPONGE RUBBER (SHIELD)
(Ver. D)
RA0365500
BLIND SEET (70 x 10)
RA0365500
BLIND SEET (4 x 3)
RA0405200
SP HOLDER
RA0378300
SPONGE RUBBER
RA0383600
PANEL ASSY
RA0376000
VOL KNOB
RA0377000
RA0392000
CHASSIS
RA005600C
GAP PAD
S6000379
SUPPORT
RA0060700
PM HOLDER
RA0066400
FERRITE BEADS
L9190001
WIRE ASSY
T9206633
SPEAKER
M4090154
BLIND SEET (4 x 3)
RA0405200
WIRE ASSY
T9206979
PANEL UNIT
MAIN UNIT
CONNECTOR
P1090984
CONNECTOR
P1090654
WIRE ASSY
T9206634A
G1093909 (Ver. CS1)
G1093885 (Ver. D, DS1)
DESCRIPTION
BINDING HEAD SCREW M2.6 x 6 NI
BINDING HEAD SCREW M3 x 6 NI
BINDING HEAD SCREW M3 x 8 NI
TAPTITE SCREW M3 x 6 NI
TAPTITE SCREW M3 x 8
OVAL HEAD SCREW M2.6 x 6 B
VXSTD P/N
U20206002
U20306002
U20308002
U24306002
U24308001
U31206007
SHIELD GASKET (Ver. CS1, DS1)
RA0515100
RA0460200
SHIELD SHEET
(Ver. CS1, DS1)
RA0513400
BLIND SHEET (34 x 8) (Lot. 1~4)
RA0404900
BLIND SHEET (4 x 25) (Lot. 1~3)
RA0425500
BLIND SHEET (35 x 4) (Lot. 1~4)
RA0405000
SHIELD GASKET
RA0517900
(Ver. CS1, DS1)


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