Vertex Standard VX-160U User manual

Introduction
This manual provides technical information necessary for servicing the VX-160U and VX-180U 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.
©2007 VERTEX STANDARD CO., LTD. EC013U90C
Service Manual
VX-160U/-180U
UHF FM Transceiver
Operating Manual Reprint............................ 2
Cloning ........................................................................ 6
Specifications ................................................... 7
Exploded View & Miscellaneous Parts ...... 8
Contents
Block Diagram ................................................. 9
Circuit Description ................................11
Alignment .................................................13
Board Unit (
Schematics, Layouts & Parts )
MAIN Unit ............................................................... 17
VX-160U VX-180U
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
VERTEX STANDARD (AUSTRALIA)PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia

7
Specifications
GENERAL Specifications
Frequency Range (MHz): 400 - 430 (AS1)
450 - 485 (D)
485 - 512 (F)
Number of Channels: 16 channels
Channel Spacing: 12.5 / 25 kHz
PLL Steps 5 / 6.25 kHz
Power Supply voltage: 7.5 VDC ± 20%
Operating Temperature Range: –22°F to +140°F (–30°C to +60°C)
Frequency Stability: ±2.5 ppm
Dimensions (WHD): 2.3" (W) x 4.7" (H) x 1.2" (D) (58 x 120 x 31 mm)
Weight (approx.): 0.81 lb. (365 g) w/FNB-64
RECEIVER Specifications (Measurements made per EIA standard TIA/EIA-603)
Sensitivity
EIA 12 dB SINAD : 0.25 µV
20 dB Quieting : 0.35 µV
Adjacent channel selectivity: 65 dB (25 kHz) / 60 dB (12.5 kHz)
Intermodulation: 65 dB
Spurious and Image Rejection: 65 dB
Hum & Noise 45 dB
Audio output: 500 mW @4 Ohms, 5% THD
TRANSMITTER Specifications (Measurements made per EIA standard TIA/EIA-603)
Power output: 5.0 / 1.0 W
Modulation: 16K0F3E, 11K0F3E
Conducted Spurious Emissions: 60 dB Below Carrier
FM Hum & Noise: 40 dB (25 kHz) / 35 dB (12.5 kHz)
Audio distortion (@ 1 kHz): < 5 %
Measurements per EIA standards unless noted above. Specifications subject to change without notice or obligation.
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2
Operating Manual Reprint
t s C ectControls & Connectors
C e tt s c
Controls & Connectors efor BeginBefore You Begin
e or eg nf B i
Before You Begin
Battery Pack Installation and Removal
UTo install the battery, hold the transceiver with your
left hand, so your palm is over the speaker and your
thumb is on the top of the belt clip. Insert the battery
pack into the battery compartment on the back of the
radio while tilting the Belt Clip outward, then close
the Battery Pack Latch until it locks in place with a
“Click.”
Dis s & di s 0 OnlDisplay Icons & Indicators (VX-180 Only)
D s s d 0 ni & i s O l
Display Icons & Indicators (VX-180 Only)
UTo remove the battery, turn the radio off and remove
any protective cases. Open the Battery Pack latch on
the bottom of the radio, then slide the battery down-
ward and out from the radio while holding the Belt
Clip.
Caution!
Do not attempt to open any of the rechargeable Ni-
Cd packs, as they could explode if accidentally short-
circuited.
Low Battery Indication
UAs the battery discharges during use, the voltage gradu-
ally becomes lower. When the battery voltage reaches
6.3 volts, substitute a freshly charged battery and re-
charge the depleted pack. The TX/BUSY indicator on
the top of the radio will blink red (on the VX-180, the
“” icon will appear on the LCD) when the battery
voltage is low.
UAvoid recharging Ni-Cd batteries often with little use
between charges, as this can degrade the charge capac-
ity. We recommend that you carry an extra, fully-
charged pack with you so the operational battery may
be used until depletion (this “deep cycling” technique
promotes better long-term battery capacity).
Microphone
Speaker
MIC/SP Jack
(
External Mic/Earphone
)
VOL/PWR Knob
CH (Channel)Selector
Monitor Button
Push To Talk
(PTT)Switch
Antenna
LED Indicator
Glows Green Monitor on
Blinking Green Busy Channel (or SQL off)
Glows Red Transmitting
Blinking Red Battery Voltage is low
Blinking Yellow Receiving a Selective Call
LCD (VX-180)
Soft KEY (VX-180)
Battery Pack Latch
8 Character Alpha-numeric
Invert ble Display
This icon is the “Low Battery” in-
dicator, which appears when the
battery voltage becomes too low
for proper operation.
This indicator confirms that
DUAL 2-TONE DECODE is active.
This indicator confirms that
DUAL WATCH is active.
This indicator confirms that
this channel will be skipped
during scan.
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