Standard Horizon HX471S User manual

1
SERVICE MANUAL
Submersible Multi Band Marine Portable
HX471S
EM002N95B

2
Introduction
This manual provides technical information necessary for servicing the HX471S 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 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.

3
GENERAL
Frequency Ranges (MHz): 156 MHz - 163.275 MHz (Marine Band + WX Band), Channel Steps: 25 kHz
462.5625 MHz - 467.7125 MHz (FRS Band), Channel Steps: 6.25 kHz
151.82 MHz - 154.60 MHz (MURS), Channel Steps: 5 kHz
88 MHz - 108 MHz (FM Broadcast), Channel Steps: 100 kHz
500 kHz - 1800 kHz (AM Broadcast), Channel Steps: 10 / 9 kHz
108 MHz - 137 MHz (AIR Band), Channel Steps: 25 kHz
Frequency Stability: ±2.5 ppm (–22 °F to +140 °F [–30 °C to +60 °C])
Emission Type: 16K0F3E, 11K0F3E, 16K0G2B
Antenna Impedance: 50 Ohms
Supply Voltage: Nominal: 7.4V DC, Negative Ground (Battery Terminal)
Current Consumption: 195 mA (Receive)
68 mA (Standby, Saver Off)
45 mA (Standby, Saver On)
1.7 A (Marine High Power)
1.2 A (Marine Mid Power)
0.8 A (Marine Low Power & FRS)
Operating Temperature: –22 °F to +140 °F (–30 °C to +60 °C)
Case Size (W x H x D): 2.36” x 3.78” x 1.12” (60 x 96 x 29 mm) w/o knob & antenna
Weight (Approx.): 9.3 oz. (265 g) with FNB-80LI
TRANSMITTER
RF Power Output (@7.4 V): 5, 2.5 or 1 W (Marine Band)
0.5W (FRS Band)
Modulation Type: Variable Reactance
Maximum Deviation: ±5 kHz (Marine Band)
±2.5 kHz (FRS Band)
Spurious Emission: At least 65 dB below
Microphone Impedance: 2 k-Ohm
RECEIVER
Circuit Type: Double-Conversion Superheterodyne (NFM, AM)
Triple-Conversion Superheterodyne (WFM)
Intermediate Frequencies: NFM, AM WFM
1st: 47.25 MHz 45.8 MHz
2nd: 450 kHz 10.7 MHz
3rd: – 1 MHz
Sensitivity: 0.2 µV for 12 dB SINAD (Marine & MURS Band)
0.2 µV for 12 dB SINAD (FRS Band)
1 µV for 12 dB SINAD (FM Broadcast)
0.5 µV for 10 dB SN (AM Broadcast)
0.5 µV for 10 dB SN (AIR Band)
Adjacent Channel Selectivity: 65 dB Typical
Intermodulation: 65 dB Typical
Selectivity: 12 kHz / 25 kHz (–6 dB / –60 dB) NFM / AM
200 kHz / 300 kHz (–6 dB / –20 dB) WFM
6 kHz / 18 kHz (–6 dB / –60 dB) FRS Band
AF Output: 400 mW @ 8 Ohm for 10 % THD (@7.4 V)
Performance specifications are nominal, unless otherwise indicated, and are subject to change without notice.
Specifications

4
Exploded View & Miscellaneous Parts
RA0533700
PANEL FRAME
RA0399500
WINDOW
RA0399400
DOUBLE FACE TAPE
RA0401600
O RING
RA0399800
LIGHT GUIDE (LED)
Q7000426
LCD MODULE
RA0400000
RUBBER PACKING
RA0399100
LIGHT GUIDE (LCD)
RA014250A
DOUBLE FACE (LCD)
RA0399900
REFLECTOR SHEET
CNTL UNIT
RA0400200
STUD (X4 pcs)
RA01403AA
LATCH NAIL
RA0399700
HOLDER (PTT)
RA0400100
RUBBER KNOB (PTT)
RA0140100
MASK SHEET
RA0141600
RUBBER PACKING
FNB-80LI
RA0474200
VOLUME KNOB
RA0474100
ROTARY KNOB
RA0087900
SPECIAL NUT
RA0426900
O RING (ENC)
RA0474800
EXT CAP
RA0474300
HOLDER (SWITCH)
RA0474500
PUSH KNOB
RA0474900
CAP (SP/MIC)
RA0292200
SPECIAL NUT
RA0474600
RUBBER PACKING
AF UNIT
SW UNIT
RF UNIT
FR008330C
FPC CABLE
Q3000189
ANTENNA
CP7574001 (COLOR: SILVER) (Lot 1 - 5)
CP7574002 (COLOR: BLACK) (Lot 1 - 5)
CP7574007 (COLOR: SILVER) (Lot 6 -)
CP7574008 (COLOR: BLACK) (Lot 6 -)
PANEL ASSY
with SPEAKER, RUBBER KNOB,
MIC SHEET, SP SHEET,
PROTECTOR L,
PROTECTOR R
CP7566001 (COLOR: SILVER)
CP7566002 (COLOR: BLACK)
REAR CASE ASSY
with SMA CONNECTOR ASSY,
TERMINAL BOARD ASSY,
HOLDER (PTT),
RUBBER KNOB (PTT)
There is a direction
in WASHER.
WASHER
SCREW
EXP CAP
SUPPLIED ACCESSORIES
VXSTD P/N DESCRIPTION QTY.
Q9000786 FNB-80LI 1
Q7000462 CD-25 1
Q9500088 NC-72B 1
Q9000761 E-DC-19 1
RA029630A CLIP-14 1
S6000335 Lanyard 1
U9900145 BINDING HEAD SCREW M2X21.7 (W/ O RING) 2
U9900138 BINDING HEAD SCREW M2X5 (W/ O RING) 4
U07225120 PAN HEAD SCREW M2X2.5SUS#1 4
U9900136 SPECIAL SCREW M2X2.35 1
RA0304300 WASHER 1
U00103002 PAN HEAD SCREW M2X3NI 1
U00104002 PAN HEAD SCREW M2X4NI 6
U9900140 TAPTITE SCREW M2X6SUS#3 2
U44104002 TAPTITE SCREW M2X4NI 4
U9900141 TAPTITE SCREW M1.7X5NI#3 2
U07125102 TAPTITE SCREW M1.7X2.5SUS#1 2
U44103002 TAPTITE SCREW M2X3NI 1
U9900075 SLOTTED SET SCREW 2
RA0429900
GROUND PLATE

5
Block Diagram

6
Connection Diagram

7
Circuit Description
The HX4710S consists of RF UNIT, CNTL UNIT, VCO
UNIT and AF UNIT. The RF UNIT contains the receiver
front end, PLL IC, power and switching circuits, and the
VCO UNIT for transmit and receive local signal oscilla-
tion. The CNTL UNIT contains the CPU, and audio ICs,
and the power circuitry for the LCD. The AF UNIT con-
tains the IF, and audio ICs.
Receiver Signal Flow
The HX471S includes three receiver front ends, each opti-
mized for a particular frequency range and mode combi-
nation.
Triplexer
Signals between 0.5 and 1.8 MHz received at the antenna
terminal pass through a first low-pass filter composed of
L1041, L1001, C1203 and C1007.
Received VHF bands signals, after passing through a low-
pass filter to the VHF T/R switch circuit composed of di-
ode switch D1033 (RLS135), D1034 (1SV307).
Received UHF bands signals, after passing through a low-
pass filter to the UHF T/R switch circuit composed of di-
ode switch D1030 (RLS135) and D1031 (1SV307).
VHF Bands Reception
Received VHF bands signals pass through the Triplexer
circuit, low-pass filter/high-pass filter circuit, VHF T/R
switch circuit and protector diode D1002 (1SS362) before
additional filtering by a band-pass filter prior to applica-
tion to RF amplifier Q1002 (2SC5555). The amplified RF
signal is pass through the band-pass filter to first mixer
Q1006 (2SC5555). Meanwhile, VHF output from the VCO
UNIT is amplified by Q1011 (2SC5374) and applied
through diode T/R switch D1022 (DAN222) to mixer Q1006
as the first local signal.
The 47.25 MHz (WFM: 45.8 MHz) intermediate frequency
product of the mixer is delivered to the AF UNIT.
The TUNE-voltage from the CPU on the CNTL UNIT is
amplified by DC amplifier Q3014 (NJU7007F2) and ap-
plied to varactors D1008 and D1010 (both HVC369B),
D1007, D1009, D1011, D1012, D1013, and D1019 (all
1SV325) in the variable frequency band-pass filters. By
changing the electrostatic capacitance of the varactors,
optimum filter characteristics are provided for each spe-
cific operating frequency.
UHF Band Reception
Received UHF bands signals pass through the Triplexer
circuit, low-pass filter/high-pass filter circuit, UHF T/R
switch circuit and protector diode D1001 (1SS362) before
additional filtering by a band-pass filter prior to applica-
tion to RF amplifier Q1001 (2SC5555). The amplified RF
signal is pass through the band-pass filter, RF amplifier
Q1003 (2SC5555) and band-pass filter to first mixer Q1005
(2SC5555). Meanwhile, UHF output from the VCO UNIT
is amplified by Q1010 (2SC5374) and applied through di-
ode T/R switch D1021 (DN222) to mixer Q1005 as the first
local signal.
The 47.25 MHz intermediate frequency product of the
mixer is delivered to the AF UNIT.
0.5 - 1.8 MHz Reception
Received MW signals pass through the Triplexer circuit,
low-pass filter circuit, protector diode D1005 (1SS362) be-
fore additional filtering by a band-pass filter prior to ap-
plication to RF amplifier Q1004 (2SC4915). The amplified
RF signal is pass through the band-pass filter to first mixer
Q1007 (2SC4915). Meanwhile, MW output from the VCO
UNIT is amplified by Q1012 to mixer Q1007 as the first
local signal.
The 47.25 MHz intermediate frequency product of the
mixer is delivered to the AF UNIT.
The TUNE voltage from the CPU on the CNTL UNIT is
amplified by DC amplifier Q3014 and applied to varac-
tors D1013 (HVR100) in the variable frequency band-pass
filters. By changing the electrostatic capacitance of the var-
actors, optimum filter characteristics are provided for each
specific operating frequency.
First Intermediate Frequency (Narrow FM / AM)
The 47.25 MHz first intermediate frequency from first mix-
ers is delivered from the RF UNIT to the AF UNIT through
jacks J1003 and J2002. On the AF UNIT, the IF for AM and
FM-narrow signals is passed through NAR/WIDE switch
D2001 (DAP222) and 47.25 MHz monolithic crystal filter
(MCF) XF2001 to narrow IF amplifier Q2002 (2SC4915)
for input to pin 16 of Narrow IF IC Q2013 (TA31136FN)
after amplitude limiting by D2002 (DA221).
Meanwhile, a portion of the output of 11.7 MHz crystal
X1001 on RF UNIT is multiplied fourfold by Q2005
(2SC4915) and Q2010 (2SC4154E) to provide the 46.8
MHz second local signal, applied to the Narrow IF IC.
Within the IC, this signal is mixed with the 47.25 MHz first
intermediate frequency signal to produce the 450 KHz sec-
ond intermediate frequency.
This second IF is filtered by ceramic filter CF2002
(ALFYM450F=K) and amplified by the limiting amplifier
within the Narrow IF IC before quadrate detection by ce-
ramic discriminator CD2001 (CDBM450C7).

8
Circuit Description
Demodulated audio is output from pin 9 of the Narrow IF
IC through narrow mute analog switch Q2020 (2SJ364)
and squelch gate Q2026 (2SJ364) before de-emphasis at
Q2019 (DTC144EE).
The resulting audio is amplified by AF amplifier Q2028
(TDA7233D) and output through MIC/EAR jack J2001 to
internal speaker SP1001 or an external earphone.
First Intermediate Frequency (Wide FM)
The 45.8 MHz first intermediate frequency from first mix-
ers is delivered from the RF UNIT to the AF UNIT through
jacks J1003 and J2002. On the AF UNIT, the IF for Wide
FM signals is passed through NAR/WIDE switch D2001
(DAP222) and IF amplifier Q2004 (2SC4915) and second
mixer Q2009 (2SC4915).
The 10.7 MHz intermediate frequency product of the mix-
er is delivered to the 10.7 MHz ceramic filter CF2001 passed
through NAR/WIDE switch D2002 (DAN222) for input to
pin 16 of IF IC Q2013 after amplitude.
Meanwhile, a portion of the output of 11.7 MHz crystal
X1001 on RF UNIT is multiplied fourfold by Q2007
(2SC4915) to provide the 35.1 MHz second local signal,
applied to the second mixer Q2009. Within the second
mixer, this signal is mixed with the 45.8 MHz first inter-
mediate frequency signal to produce the 10.7 MHz second
intermediate frequency.
Also, a portion of the output of 11.7 MHz crystal X1001 on
RF UNIT is amplitude by Q2005 and Q2010 to provide the
11.7 MHz third local signal, applied to the IF IC Q2013.
Within the IC, this signal is mixed with the 10.7 MHz sec-
ond intermediate frequency signal to produce the 450 KHz
second intermediate frequency.
Demodulated audio is output from pin 9 of the Narrow IF
IC through narrow mute analog switch Q2020 and squelch
gate Q2026 before de-emphasis at Q2019.
The resulting audio is amplified by AF amplifier Q2028
and output through MIC/EAR jack J2001 to internal speaker
SP1001 or an external earphone.
Squelch Control
Signal components in the neighborhood of 15 KHz con-
tained in the discriminator output pass through an active
band-pass filter composed of R2059, R2060, R2062, C2076,
C2078 and the operational amplifier between pins 7 and 8
within IF IC Q2013. They are then rectified by D2006 and
D2007 (MC2850) to obtain a DC voltage corresponding to
the level of noise. This voltage is input to pin 51 of CPU
Q3023 (HD64F2238RTF13), which compares the input
voltage with a previously set threshold. When the input
voltage drops below the threshold, normally due to the
presence of a carrier, turning on squelch gate Q2026 and
allowing any demodulated audio to pass. At the same time,
Q3001 and/or Q3003 and/or Q3004 goes on, causing the
BUSY/TX lamp D3010 (FRGB1312CE-10-TF) to light.
Transmitter Signal Flow
VHF Band Transmit/Receive Switching
Closing PTT switch S2002 on the AF UNIT pulls the base
of Q3008 (DTA144EE) low, causing the collector to go high.
This signal is input to pin 41 (PTT) of CPU Q3023, allow-
ing the CPU to recognize that the PTT switch has been
pushed. When the CPU detects closure of the PTT switch,
pin 17 (TX/RX) goes high. This control signal is delivered
to the RF UNIT, where it switches Q1029 (UMW1) and
Q1028 (CPH6102) to produce the TX control signal that
activates Q1035 (2SA1774). At the same time, PLL divi-
sion data is input to PLL IC Q1013 (MB15A01PFV1) from
the CPU, to disable the receiver power saver. Also, switch-
ing Q1033 (KRC654U) to disable the receiver circuits. Then
causing the red side of BUSY/TX lamp D3033 to light.
Modulation
Voice signal input from either built-in microphone MC1001
(EM-140) on CNTL UNIT or external jack J2001 on the AF
UNIT is pre-emphasized by C3011 and R3025, and pro-
cessed by microphone amplifier Q3006 (NJM3403AV), IDC
(instantaneous deviation control) circuit to prevent over-
modulation, and active low-pass filter.
During CTCSS operation, the voice signal is mixed with
the TONE ENC subaudible tone signal from pin 43 of the
CPU and delivered to the RF UNIT through jacks J3003
and J1003.
VHF Band Transmission
Modulating audio from the CNTL UNIT passes through
deviation setting D/A converter Q3010 to VHF MOD of
the VCO UNIT mounted on the RF UNIT. This signal is
applied to varactor D4005 (HSC277) in the tank circuit of
VHF VCO Q4004 (EC3H07B), which oscillates at the de-
sired VHF transmitting frequency. The modulated VCO
signal is buffered by amplifier Q4006 (EC3H07B) and
Q1011 and delivered through VHF T/R diode switch D1022
to the RF UNIT. The modulated low-level VHF transmit
signal from the VCO is passed through diode switch D1024
(DAN222) to amplifier Q1008 (2SC5226-5). The modulat-
ed VHF transmit signal from the VCO is amplified by
Q1016 (2SK3475) and RF power amplifier Q1019
(2SK3476) up to 5 W (Marine). The RF output passes
through TX diode switch D1033. RF output is passed by T/
R switch and low-pass filter to suppress harmonics and
spurious products before output to the antenna at the an-
tenna terminal.

9
Circuit Description
UHF Band Transmission
Modulating audio from the CNTL UNIT passes through
deviation setting D/A converter Q3010 to UHF MOD of
the VCO UNIT mounted on the RF UNIT. This signal is
applied to varactor D4002 (HSC277) in the tank circuit of
UHF VCO Q4002 (EC3H07B), which oscillates at the de-
sired UHF transmitting frequency. The modulated VCO
signal is buffered by amplifier Q4006 and Q1010 and de-
livered through UHF T/R diode switch D1021 to the RF-
UNIT. The modulated low-level UHF transmit signal from
the VCO is passed through diode switch D1024 to amplifi-
er Q1008. The modulated UHF transmit signal from the
VCO is amplified by Q1016 and RF power amplifier Q1019
up to 0.5 W (FRS). The RF output passes through TX diode
switch D1030. RF output is passed by T/R switch and low-
pass filter to suppress harmonics and spurious products
before output to the antenna at the antenna terminal.
PLL Frequency Synthesizer
PLL IC Q1013 on the RF UNIT consists of a data shift reg-
ister, reference frequency divider, phase comparator,
charge pump, intermittent operation circuit, and band se-
lector switch. Serial PLL data from the CPU is converted
into parallel data by the shift register in the PLL IC and is
latched into the comparative frequency divider and refer-
ence frequency divider to set a frequency dividing ratio
for each. An 11.7 MHz reference signal produced by X1001
is input to REF pin 1 of the PLL IC. The internal reference
frequency divider divides the 11.7 MHz reference by 2,050
(or 1,640) to obtain a reference frequency of 5 kHz (or 6.25
kHz), which is applied to the phase comparator. Mean-
while, a sample of the output of VHF VCO Q4004 or UHF
VCO Q4002 on the VCO UNIT, buffered by Q4006, is in-
put to the PLL IC, where it is frequency-divided by the
internal comparative frequency divider to produce a com-
parative frequency also applied to the phase comparator.
The phase comparator compares the phase between the
reference frequency and comparative frequency to output
a pulse corresponding to the phase difference between
them. This pulse is input to the charge pump, and the out-
put from the charge pump passes through a loop filter com-
posed of L1018, R1054, C1096, and either R1055, C1110,
R1065 and C1113 for VHF, or R1051, C1107, R1064 and
C1112 for UHF, or R1056, C1111, R1066 and C1114 for MW
band, which convert the pulse into a corresponding
smoothed varactor control voltage (VCV). The VCV is ap-
plied to varactor D4004 and D4013 (1SV325) in the VHF
VCO tank circuit, or to varactor D4001 (HVC355B) in the
UHF VCO tank circuit, or to varactor D4007 (1SV325) in
the MW band VCO to eliminate phase difference between
the reference frequency and comparative frequency, and
so locking the VCO oscillation frequency to the reference
crystal. The VCO frequency is determined by the frequen-
cy-dividing ratio sent from the CPU to the PLL IC. During
receiver power save operation, the PLL circuit operates
intermittently to reduce current consumption, for which
the intermittent operation control circuit reduces the lock-
up time.

10
Circuit Description
Note

11
Alignment
The HX471S has been carefully aligned at the factory for
the specified performance across the marine, FRS, MURS,
AIR, AM broadcast and FM broadcast bands.
Realignment should therefore not be necessary except in
the event of a component failure. All component replace-
ment and service should be performed only by an autho-
rized Standard Horizon representative, or the warranty
policy may be voided.
The following procedures cover the sometimes critical and
tedious adjustments that are not normally required once
the transceiver has left the factory. However, if damage
occurs and some parts are replaced, realignment may be
required. If a sudden problem occurs during normal oper-
ation, it is likely due to component failure; realignment
should not be done until after the faulty component has
been replaced.
We recommend that servicing be performed only by au-
thorized Standard Horizon service technicians who are
experienced with the circuitry and fully equipped for re-
pair and alignment. Therefore, if a fault is suspected, con-
tact the dealer from whom the transceiver was purchased
for instructions regarding repair. Authorized Standard
Horizon service technicians realign all circuits and make
complete performance checks to ensure compliance with
factory specifications after replacing any faulty compo-
nents.
Those who do undertake any of the following alignments
are cautioned to proceed at their own risk. Problems caused
by unauthorized attempts at realignment are not covered
by the warranty policy. Also, Standard Horizon a division
of the VERTEX STANDARD must reserve the right to
change circuits and alignment procedures in the interest
of improved performance, without notifying owners. Un-
der no circumstances should any alignment be attempted
unless the normal function and operation of the transceiv-
er are clearly understood, the cause of the malfunction has
been clearly pinpointed and any faulty components re-
placed, and the need for realignment determined to be
absolutely necessary.
The following test equipment (and thorough familiarity
with its correct use) is necessary for complete realignment.
Correction of problems caused by misalignment resulting
from use of improper test equipment is not covered under
the warranty policy. While most steps do not require all of
the equipment listed, the interactions of some adjustments
may require that more complex adjustments be performed
afterwards. Do not attempt to perform only a single step
unless it is clearly isolated electrically from all other steps.
Have all test equipment ready before beginning, and fol-
low all of the steps in a section in the order presented.
Required Test Equipment
RF Signal Generator with calibrated output level at 500
MHz
Deviation Meter (linear detector)
AF Millivoltmeter
SINAD Meter
Inline Wattmeter with 5% accuracy at 500 MHz
Regulated DC Power Supply: adjustable from 6 to 17
VDC, 3A
50-ohm Non-reactive Dummy Load: 10W at 500 MHz
Frequency Counter: >0.1 ppm accuracy at 500 MHz
AF Signal Generator
DC Voltmeter: high impedance
VHF Sampling Coupler
AF Dummy Load: 8 ohm, 2W
Oscilloscope
Spectrum Analyzer
Special Screw Driver (VXSTD P/N: S7000421)
Alignment Preparation & Precautions
A dummy load and inline wattmeter must be connected
to the main antenna jack in all procedures that call for trans-
mission, except where specified otherwise. Correct align-
ment is not possible with an antenna. After completing one
step, read the following step to determine whether the same
test equipment will be required. If not, remove the test
equipment (except dummy load and wattmeter, if connect-
ed) before proceeding.
Correct alignment requires that the ambient temperature
be the same as that of the transceiver and test equipment,
and that this temperature be held constant between 20 and
30 °C (68 and 86 °F). When the transceiver is brought into
the shop from hot or cold air it should be allowed some
time for thermal equalization with the environment be-
fore alignment. If possible, alignments should be made with
oscillator shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly warmed up
before beginning.
Note: Signal levels in dB referred to in this procedure are
based on 0 dBm = 0.5 µV(closed circuit).
Marine Division of Vertex Standard
10900 Walker Street, Cypress, CA 90630, U.S.A
Telephone number: [phone]

12
Alignment
Alignment Procedure
Before alignment, disconnect the antenna from the
transceiver using the Special Screw Driver.
Set up the test equipment as shown for transmitter
alignment.
Maintain the supply voltage at 8.4V DC for all steps.
To set up Alignment mode, press the [ ], [MEM]and
[16/9]key while turning the transceiver on.
PLL Reference Frequency
With the wattmeter, dummy load and frequency
counter connected to the antenna jack.
Press the [ ] or [ ] key to select the display to [PLL
REF **] ([**] is “00” to “FF” Hex data). The radio now
is in the Reference Frequency Alignment Mode.
Press the [MENU]key to enable adjustment of the PLL
Reference Frequency.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the frequency
so the counter frequency is 467.7125 MHz (±100 Hz).
Press the [MENU]key to exit this Alignment Mode.
Receiver Circuit
Set up the test equipment as shown below for receiver
alignment.
Maintain the supply voltage at 8.4V DC for all steps.
Sensitivity & Squelch Threshold (Marine Band)
Press the [ ] key to select the display to [MARINE SQL
**] ([**] is “00” to “FF” Hex data). The radio now is in
the Alignment Mode of the Sensitivity & Squelch
Threshold of the Marine Band.
Set the RF signal generator output to 158.510 MHz, at
a level of –8dBµ with ±3.5 kHz deviation with a 1 kHz
audio tone.
Confirm that the SINAD meter reading is better than –
12dBµ.
Rotate the SQL knob to the 10 o’clock position and
press the [MENU]key.
Reduce the RF signal generator output to –13dBµ, then
press the [SCAN]key to read the Squelch Threshold
data.
Press the [SCAN]key again to save the new setting .
Press the [MENU]key to exit this Alignment Mode.
PLL & Transmitter Section Alignment Setup Receiver Section Alignment Setup
Inline
Wattmeter
RF Sampling
Coupler
AF Signal
Generator
8.4 V DC
Regulated Power Supply
50
Dummy Load
Ω
Frequency
Counter
Frequency
Counter
MIC GND
SINAD
Meter
8.4 V DC
Regulated Power Supply
RF Signal
Generator
8
Dummy Load
Ω
SP GND

13
Alignment
Sensitivity & Squelch Threshold (FRS Band)
Press the []key to select the display to [FRS SQL
**] ([**] is “00” to “FF” Hex data). The radio now is in
the Alignment Mode of the Sensitivity & Squelch
Threshold of the FRS Band.
Set the RF signal generator output to 465.1375 MHz, at
a level of –8dBµ with ±3.5 kHz deviation with a 1 kHz
audio tone.
Confirm that the SINAD meter reading is better than –
12dBµ.
Rotate the SQL knob to the 10 o’clock position and
press the [MENU]key.
Reduce the RF signal generator output to –13dBµ, then
press the [SCAN]key to read the Squelch Threshold
data.
Press the [SCAN]key again to save the new setting.
Press the [MENU]key to exit this Alignment Mode.
Sensitivity & Squelch Threshold (FM Broadcast Band)
Press the [ ] key to select the display to [WFM SQL
**] ([**] is “00” to “FF” Hex data). The radio now is in
the Alignment Mode of the Sensitivity & Squelch
Threshold of the FM Broadcast Band.
Set the RF signal generator output to 88.100 MHz, at a
level of +5dBµ with ±22 kHz deviation with a 1 kHz
audio tone.
Confirm that the SINAD meter reading is better than –
12dBµ.
Press the [MENU]key.
Reduce the RF signal generator output to +7dBµ, then
press the [SCAN]key to read the Squelch Threshold
data.
Press the [SCAN]key again to save the new setting.
Press the [MENU]key to exit this Alignment Mode.
Transmitter Circuit
Set up the test equipment as shown below for trans-
mitter alignment.
Maintain the supply voltage at 8.4V DC for all steps.
Transmitter Output (Marine Band)
Press the [ ] key to select the display to [HIGH
POWER **] ([**] is “00” to “FF” Hex data). The radio
now is in the Alignment Mode of the Transmitter Out-
put of the Marine Band.
Press the [MENU]key to enable adjustment of this
Alignment Mode.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 5.0 W (±0.3 W), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [MID POWER
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 2.5 W (±0.2 W), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [LOW POWER
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 1.0 W (±0.1 W), then press the [MENU]key to
save the new setting.
Press the [BAND]key (Change the frequency display
to 162.025 from 155.000 MHz), then press the [MENU]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 1.0 W (±0.1 W), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [MID POWER
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 2.5 W (±0.2 W), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [HIGH
POWER **], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 4.5 W (±0.3 W), then press the [MENU]key to
save the new setting.
Press the [ ] key three times to select the display to
[MARINE DEV **], then press the [MENU]key. The
radio now is in the Alignment Mode of the TX devia-
tion of the Marine Band.
Set the Audio generator output to 50 mV at 1 kHz.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation

14
Alignment
to 4.2 kHz (±0.2 kHz), then press the [MENU]key to
save the new setting.
Press the [BAND]key (Change the frequency display
to 162.025 from 155.000 MHz), then press the [MENU]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 4.2 kHz (±0.2 kHz), then press the [MENU]key to
save the new setting.
Transmitter Output (FRS Band)
Press the [ ] key three times to select the display to
[FRS POWER **] ([**] is “00” to “FF” Hex data). The
radio now is in the Alignment Mode of the Transmit-
ter Output of the FRS Band.
Press the [MENU]key to enable adjustment of this
Alignment Mode.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 0.5 W (±0.05 W), then press the [MENU]key
to save the new setting.
Press the [BAND]key (Change the frequency display
to 467.712 from 462.562 MHz), then press the [MENU]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the output
power to 0.5 W (±0.05 W), then press the [MENU]key
to save the new setting.
Press the [ ] key to select the display to [FRS DEV
**], then press the [MENU]key. The radio now is in
the Alignment Mode of the TX deviation of the FRS
Band.
Set the Audio generator output to 50 mV at 1 kHz.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 2.1 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [BAND]key (Change the frequency display
to 467.712 from 462.562 MHz), then press the [MENU]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 2.1 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Turn off the Audio generator output.
Press the []key to select the display to [FRS 67.0
**], then press the [MENU]key. The radio now is in
the Alignment Mode of the CTCSS deviation of the FRS
Band.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [FRS 100.0
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [FRS 250.3
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [BAND]key (Change the frequency display
to 467.712 from 462.562 MHz), then press the [MENU]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [FRS 100.0
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [ ] key to select the display to [FRS 67.0
**], then press the [MENU]key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [ ] or [ ] key to adjust the deviation
to 0.5 kHz (±0.1 kHz), then press the [MENU]key to
save the new setting.
Press the [16/9]key to save the new setting and exit to the
normal operation.

15
Circuit Diagram
RX: 1.87 V
TX: 0 V
RX: 0.80 V
TX: 0 V
RX: 0.77 V
TX: 0 V
RX: 1.04 V
TX: 0 V
RX: 1.92 V
TX: 0 V
RX: 0.73 V
TX: 0 V
RX: 1.32 V
TX: 0 V
RX: 0 V
TX: 1.52 V
RX: 0 V
TX: 2.16 V
RX: 0 V
TX: 1.04 V
RX: 0 V
TX: 5.90 V
RX: 0 V
TX: 5.95 V
RX: 0 V
TX: 5.15 V
RX: 0 V
TX: 1.29 V
RX: 0 V
TX: 2.05 V RX: 0 V
TX: 3.85 V
RX: 0 V
TX: 2.05 V
RX: 8.40 V
TX: 8.03 V
RX: 8.40 V
TX: 8.03 V
RX: 0 V
TX: 2.50 V
RX: 0 V
TX: 5.95 V
RX: 0 V
TX: 0.82 V
RX: 0 V
TX: 0.22 V
RX: 0 V
TX: 5.92 V
RX: 0 V
TX: 1.84 V
RX: 0 V
TX: 0.81 V
RX: 0 V
TX: 1.63 V
RX: 0 V
TX: 1.70 V
RX: 0 V
TX: 2.80 V
RX: 0 V
TX: 0.76 V
RX: 0 V
TX: 0.76 V
RX: 0 V
TX: 0.66 V
RX: 0.73 V
TX: 0.77 V
RX: 1.05 V
TX: 1.45 V
RX: 1.72 V
TX: 0 V
RX: 1.27 V
TX: 0.91 V
RX: 1.93 V
TX: 0 V
RX: 0.76 V
TX: 0.68 V
RX: 1.69 V
TX: 0 V
RX: 2.31 V
TX: 0V
RX: 0.78 V
TX: 0 V
RX: 2.89 V
TX: 0 V
RX: 2.41 V
TX: 0 V
RX: 0.79 V
TX: 0 V
RX: 3.38 V RX: 1.47 V
RX: 1.95 V
RX: 0.66 V RX: 0.32 V
RX: 1.34 V
RX: 1.84 V
RX: 0.77 V
RX: 0 V
TX: 0 V
RX: 1.93 V
TX: 1.93 V
RX: 1.30 V
TX: 1.30 V
RX: 1.06 V
TX: 1.06 V
RX: 2.93 V
TX: 2.93 V
RX: 0 V
TX: 0 V
UNLOCK: 3.00 V
RX: 0.67 V
TX: 0.67 V
RX: 2.36 V
TX: 2.36 V
RX: 3.00 V
TX: 3.00 V
RX: 6.50 V
TX: 6.50 V
RX: 0 V
TX: 0 V
RX: 0 V
TX: 0 V
RX: 2.10 V
TX: 2.17 V
RX: 1.51 V
TX: 1.57 V
RX: 2.10 V
TX: 2.17 V
RX: 2.77 V
TX: 0 V
RX: 2.02 V
TX: 0 V
RX: 0 V
TX: 0 V
RX: 2.99 V
TX: 0 V
RX: 0 V
TX: 0 V
RX: 2.98 V
TX: 2.98 V
RX: 0 V
TX: 0.10 V
RX: 0 V
TX: 5.95 V
RX: 0 V
TX: 0 V
RX: 0 V
TX: 5.25 V
RX: 2.10 V
TX: 2.10 V
RX: 1.96 V
TX: 1.98 V
RX: 2.75 V
TX: 0 V
RX: 2.98 V
TX: 2.98 V
RX: 0 V
TX: 0.10 V
RX: 0 V
TX: 5.27 V
RX: 0 V
TX: 5.95 V
RX: 0 V
TX: 2.99 V
RX: 0 V
TX: 2.39 V
RX: 0 V
TX: 6.07 V
RX: 0 V
TX: 2.93 V
RX: 8.40 V
TX: 8.10 V
RX: 3.00 V
TX: 3.00 V
RX: 2.83 V
TX: 0.50 V
RX: 2.25 V
TX: 2.75 V
RX: 2.22 V
TX: 2.22 V
RX: 2.92 V
TX: 2.92 V
RX: 0 V
TX: 0 V
RX: 8.40 V
TX: 8.10 V
RX: 3.00 V
TX: 3.00 V
RX: 0 V
TX: 3.00 V
RF Unit (Lot 1 ~ 3)

16
Circuit Diagram
RF Unit (Lot 4 ~ 6)

17
Circuit Diagram
RF Unit (Lot 7 ~)

18
Note
RF Unit

19
Parts Layout (Side A)
RF Unit (Lot 1 ~ 3)
ACBD
1
3
2
DTC144EE (26)
(Q1020, 1021, 1024, 1026)
KRC654U (ND)
(Q1034)
NJM2904V
(Q1017)
KRA755U (PE)
(Q1032)
2SK3476
(Q1019)
1SS321 (F9)
(D1027)
1SS385 (09)
(D1029)
DAN222 (N)
(D1021, 1024, 1025)
1SS362 (C3)
(D1001)
KRA760U (PK)
(Q1018, 1027)
2SC4154 (LE)
(Q1022)
2SC5226 (R22)
(Q1008)
2SC5374 (NA)
(Q1010)
2SC5555 (ZD-)
(Q1001, 1003, 1005)
2SA1774 (FR)
(Q1023, 1025, 1035)
2SK3475
(Q1016)

20
Parts Layout (Side B)
RF Unit (Lot 1 ~ 3)
acbd
1
3
2
2SC4915 (QY)
(Q1004, 1007, 1014)
2SC5374 (NA)
(Q1011, 1012)
2SC5555 (ZD-)
(Q1002, 1006)
KRC654U (ND)
(Q1033)
UMW1 (W1)
(Q1029)
1SS362 (C3)
(D1002, 1005)
DAN222 (N)
(D1022)
KRA760U (PK)
(Q1030)
2SA1774 (FR)
(Q1031)
MB15A01PFV
(Q1013)
CPH6102 (AB)
(Q1028)
DTA144EE (16)
(Q1015)