Kenwood TM-281A User manual

SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2011-8 PRINTED IN JAPAN
B51-8988-00 (N)217
TM-281A
144MHz FM TRANSCEIVER
Key top
(K29-9497-01)
Modular jack (MIC)
(E58-0535-05)
Panel assy
(A62-1187-13)
Knob (VOL)
(K29-9498-03)
Knob (ENC)
(K29-9499-03)
DISASSEMBLY FOR REPAIR ......................2
CIRCUIT DESCRIPTION ..............................5
COMPONENTS DESCRIPTION...................9
SEMICONDUCTOR DATA.........................11
PARTS LIST ...............................................12
EXPLODED VIEW ......................................18
PACKING....................................................19
ADJUSTMENT ..........................................20
TERMINAL FUNCTION .............................29
PC BOARD
TX-RX UNIT (X57-8130-XX)..................30
SCHEMATIC DIAGRAM ............................36
BLOCK DIAGRAM .....................................40
LEVEL DIAGRAM ......................................42
SPECIFICATIONS ...................BACK COVER
CONTENTS

TM-281A
2
Document Copyrights
Copyright 2011 by Kenwood Corporation. All rights re-
served.
No part of this manual may be reproduced, translated,
distributed, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or other-
wise, for any purpose without the prior written permission
of Kenwood.
Disclaimer
While every precaution has been taken in the preparation
of this manual, Kenwood assumes no responsibility for er-
rors or omissions. Neither is any liability assumed for dam-
ages resulting from the use of the information contained
herein. Kenwood reserves the right to make changes to any
products herein at any time for improvement purposes.
1. Disassembly Procedure
1. When removing the cabinet, first remove the two screws
from the right and left with a phillips screwdriver.
Then, hook your finger on the edge of the cabinet and pull
it out until it is over the chassis protrusion. Remove the
cabinet by prying the cabinet as shown below.
Cabinet
DISASSEMBLY FOR REPAIR
2. To remove the panel assembly, first turn the transceiver
upside down.
Then, insert a flat-head screwdriver into the holes of the
chassis and tilt it in the direction as shown by the arrow.
Panel assembly
Holes

TM-281A
3
3. Disconnect the flat cable from the connector of the panel
assembly.
Flat cable
4. To remove the Display PCB, first remove the volume
knob q.
Then, remove the encoder knob w.
Remove the two screws efrom the Display PCB using a
phillips screwdriver.
Remove the speaker holder of the key top from the
speaker. r
Remove the Display PCB with the speaker from the panel
assembly. t
.
.
;
@
:
=
Speaker holder
of the key top
Panel assembly
Display PCB
5. When removing the TX-RX PCB, first remove the solder
of the antenna hot pin and positive terminal of the DC
cord.
Then, remove the 15 screws from the TX-RX PCB, power
module, and audio amp.
Positive terminal
of the DC cord Antenna hot pin
Power module
TX-RX PCB
Audio amp
Note:
When you supply power to the TX-RX PCB after removing
the TX-RX PCB from the chassis, solder the positive and
ground terminals of the DC cord (recommendation: E30-
3448-25) to the +B and GND terminals of the TX-RX PCB.
TX-RX PCB
Component side
GND
+B
DISASSEMBLY FOR REPAIR

TM-281A
4
6. Pull it out behind the chassis by rotating the bush eof
the DC cord 90 degrees in the direction of the arrow after
the screw qin the negative terminal is removed, and the
positive terminal wis removed from the chassis.
DC cord
:
@
.
2. Precautions for Reassembly
1. Mount the key top and speaker onto the panel assembly.
Then, tighten the two screws qof the Display PCB.
Insert the protrusion area of the key top into the groove
area of the panel assembly using a flat-head screwdriver.
w
Then, mount the encoder knob eand volume knob r.
:@
.
;
:
Key top
Panel assembly
Display PCB
Speaker
2. When mounting the panel assembly, pass the flat cable
through the hole of the chassis as shown below, then
connect the flat cable to connector of the panel assembly.
Hole of
the chassis
Panel assembly
Panel
assembly
Chassis
Chassis
3. Fit the panel assembly into the two tabs of the chassis
top side first.
Then, fit the panel assembly into the two tabs of the
chassis bottom side by turning the panel assembly.
Panel assembly
Tabs
3. How to Mount the AF PA IC (IC715)
Solder it onto the TX-RX unit (A/2) so that the AF PA IC
part number label “LA4600” is on the reverse side.
Pin 1 marker
IC715
TX-RX UNIT (X57-8130-XX) (A/2)
: TX-RX section
Component side
DISASSEMBLY FOR REPAIR

TM-281A
5
Frequency Configuration
The receiver utilizes double conversion. The first IF is
49.95MHz and the second IF is 450kHz. The first local oscil-
lator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the neces-
sary frequencies. Figure 1 shows the frequencies.
ANT
SW
RF
AMP
1st
MIX
AF
PA
TCXO
MIC
AMP
x3
multiply
RF
AMP
POWER
AMP
CF 450kHz
MCF
49.95MHz
IF SYSTEM
PLL/VCO
16.8MHz
50.4MHz
ANT
RX
TX
SP
MIC
1/2
Fig. 1 Frequency configuration
Receiver System
The receiver is a double conversion superheterodyne.
The frequency configuration is shown in Figure 1.
■Front-end RF Amplifier
An incoming signal from the antenna is applied to an RF
amplifier (Q505) after passing through a transmit/receive
switch circuit (D309, D311, D306 and D307 are off) and
a band pass filter (L515, L514 and varactor diodes: D509,
D508). After the signal is amplified, the signal is filtered
through a band pass filter (L511, L510 and varactor diodes:
D506, D505) to eliminate unwanted signals before it is
passed to the first mixer.
The voltage of these diodes are controlled by tracking the
MCU (IC707) center frequency of the band pass filter. (See
Fig. 2.)
■First Mixer
The signal from the RF amplifier is heterodyned with the
first local oscillator signal from the PLL frequency synthesiz-
er circuit at the first mixer (Q504) to create a 49.95MHz first
intermediate frequency (1st IF) signal. The first IF signal is
then fed through the monolithic crystal filter (MCF: XF501)
to further remove spurious signals.
■IF Amplifier
The first IF signal is amplified by Q503, and then goes to
IC501 (FM processing IC). The signal is heterodyned again
with a second local oscillator signal within IC501 to create
a 450kHz second IF signal. The second IF signal is then
fed through a 450kHz ceramic filter (Wide: CF501, Narrow:
CF502) to further eliminate unwanted signals before it is
amplified and FM detected in IC501.
Item Rating
Nominal center frequency 49.95MHz
Pass bandwidth ±4.0kHz or more at 3dB
50dB stop bandwidth ±25.0kHz or less
Ripple 1.0dB or less
Insertion loss 5.0dB or less
Guaranteed attenuation 80dB or more at fo ± 900kHz
Spurious 50dB or more at fo ± 1MHz
Terminating impedance 270Ω/ 8.5pF
Table 1 Crystal filter (L71-0655-05): XF501
Item Rating
Nominal center frequency 450kHz
6dB bandwidth ±7.5kHz or more
50dB bandwidth ±15.0kHz or less
Ripple 2.0dB or less
Insertion loss 6.0dB or less
Guaranteed attenuation 35.0dB or more within fo ± 100kHz
I/O matching impedance 1.5kΩ
Table 2 Ceramic filter (L72-1034-05): CF501
Item Rating
Nominal center frequency 450kHz
6dB bandwidth ±4.5kHz or more
50dB bandwidth ±10.0kHz or less
Ripple 2.0dB or less
Insertion loss 6.0dB or less
Guaranteed attenuation 60.0dB or more within fo ± 100kHz
I/O matching impedance 2.0kΩ
Table 3 Ceramic filter (L72-0999-05): CF502
ANT
L515,L514
D509,D508
BPF
Q505
RF AMP
Q503
IF AMP
IC705
D/A CONVERTER
Q504
MIX
XF501
MCF
D306,D307
D309,D311
ANT
SW
IC705
D/A
IC706
DC AMP
Q501
x3 multiply
IC2
1/2 divider X1
TCXO
IC501
FM IC
1st local OSC (VCO/PLL)
W/NO
(EVOL2)
CF501 (Wide)
CF502 (Narrow)
TV
MCU
L511,L510
D506,D505
BPF
Fig. 2 Receiver system
CIRCUIT DESCRIPTION

TM-281A
6
■Wide/Narrow Switching Circuit
The Wide port (pin 65) and Narrow port (pin 64) of the
MCU is used to switch between ceramic filters. When
the Wide port is high, the ceramic filter SW diodes (D501,
D502) cause CF501 to turn on to receive a Wide signal.
When the Narrow port is high, the ceramic filter SW di-
odes (D501, D502) cause CF502 to turn on to receive a Nar-
row signal. (See Fig. 3.)
Narrow
IC707 64pin
IF_IN MIX_O
IC501
FM IC
CF502
(Narrow)
CF501
(Wide)
R505 R507
R506
R504
D501 D502
Wide
IC707 65pin
Fig. 3 Wide/Narrow switching circuit
■AF Signal System
The detection signal from the FM IC (IC501) goes to the
D/A converter (IC705) to adjust the gain and is output to the
AF filter (IC709) for characterizing the signal. The AF signal
output from IC709 and the DTMF signal, BEEP signal are
summed and the resulting signal goes to the D/A converter
(IC705). The AFO output level is adjusted by the D/A con-
verter. The signal output from the D/A converter is input to
the audio power amplifier (IC715). The AF signal from IC715
switches between the internal speaker and the speaker jack
(J701) output. (See Fig. 4.)
AF
Filter
D/A
CONV.
D/A
CONV.
IC705 IC709 IC705
W/NO
(EVOL2) AF PA
IC715 SP
FM IC
IC501
Fig. 4 AF signal system
■Squelch Circuit
The detection output from the FM IC (IC501) passes
through a noise amplifier (Q502) to detect noise. A volt-
age is applied to the MCU (IC707). The MCU controls the
squelch according to the voltage (SQIN) level. The signal
from the RSSI pin of IC501 is used for the S-meter. The
electric field strength of the receive signal can be known
before the SQIN voltage is input to the MCU, and the scan
stop speed is improved.
Q502
NOISE AMP D503IC501 IC707
FILOUT
RSSI
DET
MCUFM IC
SQIN
RSSI
Fig. 5 Squelch circuit
PLL Frequency Synthesizer
The PLL circuit generates the first local oscillator signal
for reception and the RF signal for transmission.
■PLL
The frequency step of the PLL circuit is 5 or 6.25kHz. A
16.8MHz reference oscillator signal is divided at IC1 by a
fixed counter to produce the 5 or 6.25kHz reference fre-
quency. The voltage controlled oscillator (VCO) output sig-
nal is buffer amplified by Q9, then divided in IC1 by a dual-
module programmable counter. The divided signal is com-
pared in phase with the 5 or 6.25kHz reference signal in the
phase comparator in IC1. The output signal from the phase
comparator is filtered through a low-pass filter and passed
to the VCO to control the oscillator frequency. (See Fig. 6.)
■VCO
Double the operating frequency is generated by Q6 in
transmit mode and Q4 in receive mode. The oscillator fre-
quency is controlled by applying the VCO control voltage,
obtained from the phase comparator, to the varactor diodes
(D4 and D6 in transmit mode and D3 and D5 in receive
mode). The TX/RX pin is set high in receive mode causing
Q7 and Q5 to turn Q6 off, and turn Q4 on. The TX/RX pin is
set low in transmit mode. The outputs from Q4 and Q6 are
amplified by Q9 and sent to the RF amplifiers through a 1/2
divider (IC2). (See Fig. 6.)
D4,D6
IC2
Q6
TX VCO
Q9
BUFF
AMP
D3,D5
Q4
RX VCO
Q5,Q7
T/R SW
1/2
divider
Charge
pump
LPF
Phase
comparator
1/M
1/N 5kHz/6.25kHz
5kHz/6.25kHz
REF
OSC
16.8MHz
PLL
DATA
IC1 : PLL IC
Q3
AMP
RF amplifiers
Q1,Q2
TX/RX (MCU)
Fig. 6 PLL circuit
CIRCUIT DESCRIPTION

TM-281A
7
■Unlock Circuit
During reception, the 8RC signal goes high, the 8TC
signal goes low, and Q708 turns on. Q710 turns on and a
voltage is applied to 8R. During transmission, the 8RC sig-
nal goes low, the 8TC signal goes high and Q709 turns on.
Q711 turns on and a voltage is applied to 8T.
The MCU monitors the PLL IC (IC1) LD signal directly.
When the PLL is unlocked during transmission, the PLL LD
signal goes low. The MCU detects this signal and makes
the 8TC signal low. When the 8TC signal goes low, no volt-
age is applied to 8T, and no signal is transmitted. (See Fig. 7.)
IC707
MCU
Q708
SW
Q710
SW
IC1
PLL
Q709
SW
Q711
SW
LD
8RC
8C
8R 8T
8TC
PLL lock
: LD “H”
Fig. 7 Unlock circuit
Transmitter System
■Outline
The transmitter circuit produces and amplifies the desired
frequency directly. It FM-modulates the carrier signal by
means of a varicap diode.
■Power Amplifier Circuit
The transmit output signal from the VCO passes through
a 1/2 divider (IC2) and the transmission/reception selection
diode (D9, D10) and is amplified by Q303. The amplified
signal goes to the power module (IC302) through a low-pass
filter. The low-pass filter removes unwanted high-frequency
harmonic components, and the resulting signal is transmit-
ted through the antenna terminal. (See Fig. 8.)
■APC Circuit
The automatic transmission power control (APC) circuit
detects part of a final amplifier output with a diode (D313,
D314) and applies a voltage to IC303. IC303 compares the
APC control voltage (PC) generated by the D/A converter
(IC705) and DC amplifier (IC706) with the detection output
voltage. IC303 generates the voltage to control the Vgg of
IC302 and stabilizes the transmission output.
The APC circuit is configured to protect over current of
IC302 due to fluctuations of the load at the antenna end and
to stabilize transmission output at voltage and temperature
variations. (See Fig. 9.)
Fig. 8 Transmitter system
Fig. 9 APC circuit
Q10
RF AMP
Q303
ANT
DRIVE
AMP
IC302
POWER
MODULE
IC2
1/2
DIVIDER
IC705 Q6
D/A
CONVERTER
D/A
CONVERTER
X1
TCXO
16.8MHz
VCO
IC1
PLL
Q9
BUFFER
Q3
RF AMP
IC706
BUFFER
IC101
IC705
MIC KEY
INPUT MCU
IC706
SUM
AMP
IC704IC703
MIC
MIC/IDC SPLATTER
FILTER
DRIVE
AMP
Q303
POWER
MODULE
IC302
DC
AMP
IC706
ANT
SW
D306,D307
D309,D311
LPF
ANT
POWER
DET
D313,D314
IC303
APC
CONTROL
D9
IC705
(PC/TVO)
(PC)
CIRCUIT DESCRIPTION

TM-281A
8
Control Circuit
The MCU carries out the following tasks (See Fig. 10.):
1) Controls the WIDE, NARROW, and TX/RX outputs.
2) Controls the display circuit.
3) Controls the PLL IC (IC1).
4) Controls the D/A converter (IC705) and adjusts the vol-
ume, modulation and transmission power.
IC705
D/A
converter
IC1
PLL
IC707
MCU
EVLLD
DT
CK
PLLE
Fig. 10 Control circuit
■Memory Circuit
The transceiver has an 64k-bit EEPROM (IC708). The EE-
PROM contains adjustment data. The MCU (IC707) controls
the EEPROM through three serial data lines. (See Fig. 11.)
EEPCK
IC707
MCU
IC708
EEPROM
EEPSDT
EEPWP
Fig. 11 Memory circuit
■ Display Circuit
The MCU (IC707) controls the display LCD and LEDs.
When power is on, the LCD driver will use the BL line to
control the LCD illumination and key backlight LEDs.
The brightness function is controlled by switch Q904.
The LCD driver (IC901) and MCU (IC707) communicate
through the CE, CL, DI, and DO lines. (See Fig. 12.)
Q901
SW
Q902
SW
IC707
MCU
D903~D905
Q903
SW D906~D911
Q904
SW
IC901
LCD
driver
CE
CL
DO
DI
BL
COM0~
COM3
SEG0~
SEG30
LCD
BRI
Fig. 12 Display circuit
■Key Matrix Circuit
The front panel has function keys. Each of them is con-
nected to a cross point of a matrix of the KI1 to KI3 and KSI
to KS2 ports of the LCD driver.
The LCD driver monitors the status of the KI1 to KI3 and
KS1 to KS2 ports. If the state of one of the ports changes,
the LCD driver assumes that the key at the matrix point cor-
responding to that port has been pressed.
IC901
LCD
driver
KI1
KI2
KI3
KS2
KS1
FUNC
REV
CALL
VFO
MR
MHz
(Encoder)
Fig. 13 Key matrix circuit
■Encode
The CTCSS and DCS signals are output from TONE of the
MCU (IC707). The DTMF signal is output from DTMF of the
MCU (IC707). These signals are summed with a MIC signal
by the summing amplifier (IC706), and the resulting signal
goes to the D/A converter (IC705) to adjust the MOD level,
and then goes to the buffer amplifier (IC706).
Part of the signal goes to the TCXO, and the rest goes to
the D/A converter (IC705) in order to adjust the modulation
balance between the VCO and TCXO.
X1
TCXO
VCO
IC706
SUM
AMP
IC705
D/A
IC705
D/A
IC706
BUFFER
IC1
PLL
Amp
MIC
IC707
MCU
TONE
DTMF
Fig. 14 Encode
■Decode
• CTCSS/DCS
The signal (W/NO (EVOL2)) goes to DTMF IN (pin 95) of
the MCU (IC707) through the amplifier (IC709). The CTCSS/
DCS signal will pass through the low-pass filters in the MCU
(IC707) and be decoded within the MCU (IC707).
IC707
MCU
IC709
AMP
DTMF IN W/NO (EVOL2)
95
Fig. 15 Decode
CIRCUIT DESCRIPTION

TM-281A
9
■D/A Converter
The D/A converter (IC705) is used to adjust the MO mod-
ulation, AF volume, TV voltage, FC reference voltage, and
PC POWER CONTROL voltage level.
Adjustment values are sent from the MCU as serial data.
The D/A converter has a resolution of 256 and the following
relationship is valid:
D/A output = (Vin – VDAref) / 256 x n + VDAref
Vin: Analog input
VDAref: D/A reference voltage (Approx. 2.2V)
n: Serial data value from the microprocessor (MCU)
Power Supply Circuit
When the power switch on the display unit is pressed,
the power port on the display unit which is connected to
port 17 (POWER), goes low, then port 82 (SBC) goes high,
Q713 turns on, SB SW (Q714) turns on and power (SB) is
supplied to the radio.
When the DC power is supplied to the radio, the volt-
age regulator IC (IC713) is supplied to the MCU VDD and
reset voltage detect IC (IC714). IC714 will generate a signal
(RESET) into the reset terminal of the MCU (IC707) to carry
out a power ON reset. If DC power is less than approxi-
mately 9.5V, the radio is unable to power on.
When the DC power voltage deceases from the normal
voltage, the INT voltage detector IC (IC712) will set to high
on MCU port 18 (INT) if B line becomes less than approxi-
mately 9.5V. The MCU will then send the backup data to the
EEPROM (IC708) and enter stop mode.
This circuit has an overvoltage protection circuit. If a DC
voltage of 18V or higher is applied to the base of Q707, this
voltage turns Q707 on and will set to high on MCU port 18
(INT). The MCU will then send the backup data to the EE-
PROM (IC708) and enter stop mode. (See Fig. 16.)
Q714
SW
Q713
SW Q707
SW
IC713
AVR
D712D710
B
IC714
RST
SBC
R824R825
INT
5M
IC707
MCU
POWER
SW
POWER
RESET
5M
IC712
INT
SB
Fig. 16 Power supply circuit
CIRCUIT DESCRIPTION
TX-RX UNIT (X57-8130-XX)
Ref. No. Use / Function Operation / Condition / Compatibility
IC1 PLL IC Frequency control
IC2 Divider Frequency divider
IC302 Power module TX final amplifier
IC303 APC controller TX power control
IC501 FM IC FM detector/ 2nd mixer/ RSSI/
Noise amplifier
IC703 OP amplifier MIC amplifier/ IDC
IC704 OP amplifier Splatter filter
IC705 Digital
potentiometer
Frequency adjustment
Modulation balance adjustment
AF level adjustment
Backlight control
Modulation limit adjustment
TX power/ BPF control
RX signal level control
Ref. No. Use / Function Operation / Condition / Compatibility
IC706 OP amplifier Buffer amplifier/ SUM amplifier/
DC amplifier/ 1/2 VCC
IC707 MCU
IC708 EEPROM Tuning data/ Memory data
IC709 OP amplifier Audio filter
IC710 5V AVR 5C
IC711 8V AVR 8C
IC712 Voltage detection MCU INT voltage detection
IC713 5V AVR 5M
IC714 Voltage detection MCU reset voltage detection
IC715 Audio amplifier Audio final amplifier
IC901 LCD driver Display control
Q1,2 Switching Charge pump
Q3 RF amplifier PLL Fin
COMPONENTS DESCRIPTION

TM-281A
10
Ref. No. Use / Function Operation / Condition / Compatibility
Q4 Oscillator RX VCO
Q5 T/R switch On when RX
Q6 Oscillator TX VCO
Q7 T/R switch
Q8 Ripple filter
Q9 Buffer amplifier Output of VCO
Q10 RF amplifier Output of VCO
Q303 Drive amplifier TX driver
Q501 Tripler 16.8MHz × 3
Q502 SQL amplifier Noise amplifier
Q503 IF amplifier
Q504 Mixer 1st mixer
Q505 RF amplifier LNA
Q506 PC/TV switch On when TX
Q701 AGC/ MIC mute
Q702,703 Beat shift switch Active while beat shift is ON
Q704,705 AF mute Active while AFM is “H”
Q706 Buffer amplifier RX audio
Q707 Over voltage
detection
Active when PS voltage is more
than 18V
Q708 DC switch (8R) Active while RX
Q709 DC switch (8T) Active while TX
Q710 DC switch (8R) Active while RX
Q711 DC switch (8T) Active while TX
Q712 AF mute Active while SPM is “H”
Q713,714 DC switch (SB) Active when power is ON
Q715 AF mute Active while AMPSW is “H”
Q901 Key backlight
switch
Q902 DC switch
Q903 LCD backlight
switch
Q904 Brightness
function switch
D1 Voltage dropped
D2 Ripple filter
D3 VCO frequency
control RX
D4 VCO frequency
control TX
Ref. No. Use / Function Operation / Condition / Compatibility
D5 VCO frequency
control RX
D6 VCO frequency
control TX
D7 VCO modulation
D8 Ripple filter
D9,10 RF switch TX/RX
D301 Voltage protection 5.1V Zener diode
D305 Protection PC/TV
D306,307 ANT switch On when TX
D309 ANT switch On when TX
D311 ANT switch On when TX
D312 Temperature
compensation
D313,314 APC voltage
detect
D316 Protection
D501,502 IF switch Wide/Narrow
D503 Detection Noise squelch
D504 Protection
D505,506 RF BPF tuning
D508,509 RF BPF tuning
D702 Surge absorption CM
D704 Surge absorption MIC key
D705 Surge absorption RXD
D706 Surge absorption PTT
D708 MIC mute
D709 Detection AGC
D710 Protection
D711 Limiter
D712 Over voltage
detection
On when PS voltage is more
than 18V
D714 Reverse connec-
tion protection
D901 Reverse connec-
tion protection
D902 Surge absorption 6.2V Zener diode
D903~905 LED Key backlight
D906~911 LED LCD backlight
COMPONENTS DESCRIPTION

TM-281A
11
MCU: 30622MEP540GU (TX-RX unit IC707)
Pin No. Name I/O Function
1 TONE O CTCSS/DCS output
2 DTMF O DTMF/BEEP/1750Hz output
3 PLLE O PLL IC chip select
4,5 NC I Not used
6 GND - GND
7 CNVSS - Not used
8 EVLLD O D/A converter chip select
9 BSHIFT O Beat shift
10 RESET I Reset
11 XOUT O X’tal (8MHz)
12 VSS - GND
13 XIN I X’tal (8MHz)
14 VCC - +5V
15 GND - GND
16 NC I Not used
17 POWER I Power key input
18 INT I MCU stop
19 NC I Not used
20 TX/RX O TX/RX
21 UL I PLL unlock detect
22,23 NC I Not used
24 EEPSDT I/O EEPROM data
25 EEPCK O EEPROM clock
26 EEPWP O EEPROM write protect
27,28 NC I (Nch open drain)
29 TXD1 O Not used
30 RXD1 I Not used
31 CLKFLS I Not used
32 BSYFLS O Not used
33 TXD O To PC
34 RXD I From PC
35 PTT I PTT input
36~38 NC I Not used
39 EMPFLS I/O Not used
40~43 NC I Not used
44 CEFLS I/O Not used
45~49 NC I Not used
50 AFM O AF mute
51 SPM O Speaker mute
52 AMPSW O AF AMP switch
Pin No. Name I/O Function
53 DT O Common data
54 CK O Common clock
55 NC I Not used
56 DST1 I Destination 1
57~59 DST2~DST4 I Destination 2~4
60 VCC - +5V
61 NC I Not used
62 VSS - GND
63 ADJ I For adjustment mode
64 NARROW O Narrow
65 WIDE O Wide
66,67 NC I Not used
68 CL O Clock for LCD
69 CE O Chip enable for LCD
70 DO O Output data to LCD
71 DI I Input data from LCD
72 NC I Not used
73 ENCB I Encoder input B
74 ENCA I Encoder input A
75,76 NC O Not used
77 MICMT O MIC mute
78 NC I Not used
79 8RC O 8R control
80 8TC O 8T control
81 NC I Not used
82 SBC O Battery switch
83~85 NC I Not used
86 CM I MIC key check
87 MICKEY2 I For AMR DTMF keypad MIC
88 MICKEY I For AMR DTMF keypad MIC
89 VOL I Volume encoder
90 TEMP2 I Temperature 2
91 TEMP1 I Temperature 1
92 RSSI I RSSI input
93 SQIN I Squelch input
94 AVSS - GND
95 DTMF IN I CTCSS/DCS/1050Hz input
96 VREF - +5V
97 AVCC - +5V
98~100 NC I Not used
SEMICONDUCTOR DATA

TM-281A
12
✽New Parts. indicates safety critical components.
Parts without Parts No. are not supplied.
Les articles non mentionnes dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
L: Scandinavia K: USA P: Canada
Y: PX (Far East, Hawaii) T: England E: Europe
C: China X: Australia M: Other Areas
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
TM-281A
TX-RX UNIT (X57-8130-XX)
1 1B
✽A02-4156-01 PLASTIC CABINET
2 2B
✽A10-4152-01 CHASSIS
3 3A
✽A62-1187-13 PANEL ASSY
5 3A B11-1809-03 ILLUMINATION GUIDE (LCD)
6 3A B38-0885-15 LCD
7 3C
✽B62-2347-10 INSTRUCTION MANUAL K,M2
7 3C
✽B62-2348-10 INSTRUCTION MANUAL M3
7 3C
✽B62-2349-10 INSTRUCTION MANUAL M4
10 2B E04-0167-15 RF COAXIAL RECEPTACLE (M)
11 2B E23-1346-04 GROUND TERMINAL (CLIP)
12 3A E29-1201-04 INTER CONNECTOR (LCD)
13 2B
✽E30-7743-05 DC CORD
14 1C
✽E30-7744-05 DC CORD ACCESSORY
15 2A
✽E37-1542-05 FLAT CABLE
16 3A
✽E37-1545-05 PARALLEL CORD (SP)
18 1C F52-0024-05 FUSE (BLADE TYPE) 15A ACCESSORY
19 3A
✽G13-2370-04 CUSHION (LCD)
20 3A
✽G53-1878-03 PACKING (PANEL)
22 1D
✽H12-4330-02 PACKING FIXTURE (RADIO)
23 2D
✽H12-4331-02 PACKING FIXTURE
24 2D
✽H52-2503-02 ITEM CARTON CASE K
26 1C J19-1584-15 HOLDER (MIC) ACCESSORY
27 3A J21-8463-03 MOUNTING HARDWARE (LCD)
28 2C J29-0726-03 BRACKET ACCESSORY
30 3A
✽K29-9497-01 KEY TOP
31 3A
✽K29-9498-03 KNOB (VOL)
32 3A
✽K29-9499-03 KNOB (ENC)
A 1A,1B N35-2604-43 BINDING HEAD MACHINE SCREW
B
1A,1B,2B N67-3008-48 PAN HEAD SEMS SCREW
C 3A N80-2008-48 PAN HEAD TAPTITE SCREW
D 1B,2B N87-2608-48 BRAZIER HEAD TAPTITE SCREW
34 2C
✽N99-2082-05 SCREW SET ACCESSORY
36 3A T07-0779-05 SPEAKER
37 1C T91-0624-65 MICROPHONE ACCESSORY M2
37 1C
✽T91-0641-75 MICROPHONE (DTMF) ACCESSORY K,M3,M4
D903-911 B30-2337-05 LED (YELLOW)
C1 CK73FB0J226M CHIP C 22UF M
C3,4 CC73HCH1H101J CHIP C 100PF J
C5,6 CK73HB1H102K CHIP C 1000PF K
C7 CC73HCH1H101J CHIP C 100PF J
C9 CK73HB1E104K CHIP C 0.10UF K
C10 CC73HCH1H680J CHIP C 68PF J
C11 CK73HB1E104K CHIP C 0.10UF K
C12 CK73FB1A106K CHIP C 10UF K
C14 CK73HB1E104K CHIP C 0.10UF K
C15 CK73FB1A106K CHIP C 10UF K
C16 CK73HB1H102K CHIP C 1000PF K
C17 CK73HB1H103K CHIP C 0.010UF K
C18 CK73HB1E104K CHIP C 0.10UF K
C20,21 CK73HB1H471K CHIP C 470PF K
C23 CK73HB1H471K CHIP C 470PF K
C25 C92-0863-05 CHIP TNTL 0.047UF 35WV
C27 C92-0588-05 CHIP TNTL 1.5UF 16WV
C28 CK73HB1H471K CHIP C 470PF K
C29 CS77CA1V0R1M CHIP TNTL 0.1UF 35WV
C34 CK73HB1H102K CHIP C 1000PF K
C35 CC73HCH1H820J CHIP C 82PF J
C36 CC73HCH1H300J CHIP C 30PF J
C38 CC73HCH1H100C CHIP C 10PF C
C39 CC73HCH1H080B CHIP C 8.0PF B
C41 CC73HCH1H0R5B CHIP C 0.5PF B
C42,43 CK73HB1H471K CHIP C 470PF K
C45 CC73HCH1H010B CHIP C 1.0PF B
C46 CC73HCH1H0R5B CHIP C 0.5PF B
C48 CK73HB1H102K CHIP C 1000PF K
C49 CC73HCH1H4R5B CHIP C 4.5PF B
C50 CC73HCH1H100C CHIP C 10PF C
C51 CC73HCH1H050B CHIP C 5.0PF B
C52 CC73HCH1H110G CHIP C 11PF G
C53 CK73HB1H102K CHIP C 1000PF K
C54 CC73HCH1H0R3B CHIP C 0.3PF B
C55 CC73HCH1H0R5B CHIP C 0.5PF B
C56 CS77BB21C220M CHIP TNTL 22UF 16WV
C57 CK73HB1H471K CHIP C 470PF K
C58 CK73HB1H102K CHIP C 1000PF K
C59 CK73HB1H471K CHIP C 470PF K
C60 CC73HCH1H060B CHIP C 6.0PF B
C61 CC73HCH1H030B CHIP C 3.0PF B
C62 CC73HCH1H020B CHIP C 2.0PF B
C63 CK73HB1H102K CHIP C 1000PF K
C64 CC73HCH1H221J CHIP C 220PF J
C65,66 CK73HB1H102K CHIP C 1000PF K
C67 CC73HCH1H180J CHIP C 18PF J
C68-70 CK73HB1H102K CHIP C 1000PF K
C71 CC73HCH1H390J CHIP C 39PF J
C72 CC73HCH1H180J CHIP C 18PF J
C306 CK73HB1H102K CHIP C 1000PF K
C308 CK73HB1H122K CHIP C 1200PF K
C309 CC73HCH1H060B CHIP C 6.0PF B
C310 CC73HCH1H080B CHIP C 8.0PF B
C312 CC73HCH1H120J CHIP C 12PF J
C318 CK73HB1H102K CHIP C 1000PF K
C328 CC73HCH1H130J CHIP C 13PF J
C329 CK73HB1H102K CHIP C 1000PF K
C330 CC73HCH1H2R5B CHIP C 2.5PF B
C331 CK73HB1E223K CHIP C 0.022UF K
C332 CC73HCH1H151J CHIP C 150PF J
C333 CK73FB1A475K CHIP C 4.7UF K
C334 CK73HB1H102K CHIP C 1000PF K
C338 CK73HB1H102K CHIP C 1000PF K
C340 CC73HCH1H221J CHIP C 220PF J
TM-281A
TX-RX UNIT (X57-8130-XX) -10: K -21: M2 -22: M3 -23: M4

TM-281A
13
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-8130-XX)
C342 CC73HCH1H101J CHIP C 100PF J
C343 CK73HB1H102K CHIP C 1000PF K
C344,345 CC73HCH1H101J CHIP C 100PF J
C347 CK73HB1E104K CHIP C 0.10UF K
C348 CK73HB1H102K CHIP C 1000PF K
C350 CK73HB1H102K CHIP C 1000PF K
C354 CC73HCH1H220J CHIP C 22PF J
C355 CC73HCH1H470J CHIP C 47PF J
C356 CC73HCH1H220J CHIP C 22PF J
C365 C93-0556-05 CHIP C 6.0PF D
C394 CK73HB1E104K CHIP C 0.10UF K
C395 CK73HB1H102K CHIP C 1000PF K
C397 CK73HB1H102K CHIP C 1000PF K
C399 CK73HB1H103K CHIP C 0.010UF K
C400,401 CK73HB1H102K CHIP C 1000PF K
C402 CK73HB1H103K CHIP C 0.010UF K
C403 CC73GCH1H270J CHIP C 27PF J
C404 C93-0563-05 CHIP C 18PF J
C405,406 C93-0603-05 CHIP C 1000PF K
C407 CK73HB1H102K CHIP C 1000PF K
C408 CC73GCH1H0R5B CHIP C 0.5PF B
C409 CC73GCH1H040B CHIP C 4.0PF B
C410 C93-0563-05 CHIP C 18PF J
C412 CK73HB1H102K CHIP C 1000PF K
C413 C93-0552-05 CHIP C 2.0PF C
C415 C93-0564-05 CHIP C 22PF J
C416 CK73HB1H102K CHIP C 1000PF K
C417 CC73GCH1H0R5B CHIP C 0.5PF B
C418 CC73GCH1H040B CHIP C 4.0PF B
C420 C93-0554-05 CHIP C 4.0PF C
C421 C93-0563-05 CHIP C 18PF J
C422 CK73HB1H102K CHIP C 1000PF K
C502 CK73HB1H103K CHIP C 0.010UF K
C503 CC73HCH1H271J CHIP C 270PF J
C504 CC73HCH1H560J CHIP C 56PF J
C505 CC73HCH1H680J CHIP C 68PF J
C506 CC73HCH1H470J CHIP C 47PF J
C507 CK73HB1H103K CHIP C 0.010UF K
C508,509 CK73HB1A105K CHIP C 1.0UF K
C510 CK73HB1H103K CHIP C 0.010UF K
C511 CK73FB1A106K CHIP C 10UF K
C513 CC73HCH1H331J CHIP C 330PF J
C514,515 CK73HB1E104K CHIP C 0.10UF K
C516 CC73HCH1H331J CHIP C 330PF J
C517 CK73HB1E104K CHIP C 0.10UF K
C518 CC73HCH1H101J CHIP C 100PF J
C519 CK73FB1A106K CHIP C 10UF K
C520 CK73HB1H102K CHIP C 1000PF K
C521 CK73HB1H103K CHIP C 0.010UF K
C522 CC73HCH1H270J CHIP C 27PF J
C523 CK73HB1E562K CHIP C 5600PF K
C524 CK73HB1E104K CHIP C 0.10UF K
C525 CK73HB1A224K CHIP C 0.22UF K
C527 CC73HCH1H050B CHIP C 5.0PF B
C528 CK73HB1H103K CHIP C 0.010UF K
C530 CK73HB1E223K CHIP C 0.022UF K
C533 CC73HCH1H060B CHIP C 6.0PF B
C534 CK73HB1A393K CHIP C 0.039UF K
C535 CK73HB1H102K CHIP C 1000PF K
C537 CC73HCH1H200J CHIP C 20PF J
C538 CK73HB1H103K CHIP C 0.010UF K
C539 CC73HCH1H020B CHIP C 2.0PF B
C541 CK73HB1H102K CHIP C 1000PF K
C544 CK73HB1E104K CHIP C 0.10UF K
C545 CC73HCH1H130J CHIP C 13PF J
C546 CC73HCH1H270J CHIP C 27PF J
C547 CK73HB1H102K CHIP C 1000PF K
C548 CK73HB1H103K CHIP C 0.010UF K
C549,550 CK73HB1H102K CHIP C 1000PF K
C551 CC73HCH1H101J CHIP C 100PF J
C552 CK73HB1H102K CHIP C 1000PF K
C553 CC73HCH1H030B CHIP C 3.0PF B
C554 CC73HCH1H240J CHIP C 24PF J
C555 CC73HCH1H010B CHIP C 1.0PF B
C556 CK73HB1H102K CHIP C 1000PF K
C557 CC73HCH1H050B CHIP C 5.0PF B
C558 CC73HCH1H330J CHIP C 33PF J
C559-562 CK73HB1H102K CHIP C 1000PF K
C565-567 CK73HB1H102K CHIP C 1000PF K
C568 CC73HCH1H101J CHIP C 100PF J
C569 CK73HB1H102K CHIP C 1000PF K
C570 CC73HCH1H010B CHIP C 1.0PF B
C571 CC73HCH1H180J CHIP C 18PF J
C572 CK73HB1H102K CHIP C 1000PF K
C573 CC73HCH1H040B CHIP C 4.0PF B
C574 CC73HCH1H1R5B CHIP C 1.5PF B
C575 CK73HB1H102K CHIP C 1000PF K
C576 CC73HCH1H180J CHIP C 18PF J
C577 CK73HB1H102K CHIP C 1000PF K
C578 CC73HCH1H390J CHIP C 39PF J
C579 CK73HB1H102K CHIP C 1000PF K
C581 CC73HCH1H330J CHIP C 33PF J
C582 CC73HCH1H010B CHIP C 1.0PF B
C583 CC73HCH1H040B CHIP C 4.0PF B
C584-587 CK73HB1E104K CHIP C 0.10UF K
C702,703 CK73HB1A473K CHIP C 0.047UF K
C713 CK73HB1H102K CHIP C 1000PF K
C718-720 CK73HB1H102K CHIP C 1000PF K
C722 CK73HB1H102K CHIP C 1000PF K
C724 CK73FB1A106K CHIP C 10UF K
C725 CK73HB1E104K CHIP C 0.10UF K
C726 CK73HB1A393K CHIP C 0.039UF K K,M2,M3
C726 CK73HB1A683K CHIP C 0.068UF K M4
C727 CK73HB1H102K CHIP C 1000PF K
C728 CK73GB0J225K CHIP C 2.2UF K
C729 CK73FB1A106K CHIP C 10UF K
C731 CK73HB1H103K CHIP C 0.010UF K
C732 CK73HB1H102K CHIP C 1000PF K K,M2,M3
C732 CK73HB1H681K CHIP C 680PF K M4
C733 CK73HB1E104K CHIP C 0.10UF K
C734 CK73HB1A393K CHIP C 0.039UF K M4
C734 CK73HB1C223K CHIP C 0.022UF K K,M2,M3
C735 CC73HCH1H680J CHIP C 68PF J
C736 CK73FB1A106K CHIP C 10UF K
C737 CK73HB1H102K CHIP C 1000PF K
C738 CK73HB1E104K CHIP C 0.10UF K
C739 CK73HB1H102K CHIP C 1000PF K
C740 CK73HB1E104K CHIP C 0.10UF K
C742 CK73HB1H821K CHIP C 820PF K
C743 CK73HB1H102K CHIP C 1000PF K

TM-281A
14
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-8130-XX)
C744 CK73FB1A106K CHIP C 10UF K
C745 CC73HCH1H390J CHIP C 39PF J
C746 CK73HB1E104K CHIP C 0.10UF K
C747 CK73FB1A106K CHIP C 10UF K
C748 CK73HB1H102K CHIP C 1000PF K
C749 CK73HB1H103K CHIP C 0.010UF K
C750 CC73HCH1H151J CHIP C 150PF J
C751 CK73GB1A105K CHIP C 1.0UF K
C752 CK73HB1H392K CHIP C 3900PF K
C753 CK73HB1E472K CHIP C 4700PF K
C754 CK73FB1A106K CHIP C 10UF K
C757,758 CK73FB1A106K CHIP C 10UF K
C761 CK73HB1E104K CHIP C 0.10UF K
C763 CC73HCH1H030B CHIP C 3.0PF B
C764 CC73HCH1H050B CHIP C 5.0PF B
C765 CK73HB1H102K CHIP C 1000PF K
C766 CC73HCH1H050B CHIP C 5.0PF B
C767 CC73HCH1H030B CHIP C 3.0PF B
C768 CK73HB1E104K CHIP C 0.10UF K
C769 CK73HB1H102K CHIP C 1000PF K
C771 CK73HB1H102K CHIP C 1000PF K
C772 CK73HB1E104K CHIP C 0.10UF K
C774 CK73HB1H182K CHIP C 1800PF K
C775 CK73HB1H392K CHIP C 3900PF K
C776 CK73HB1H102K CHIP C 1000PF K
C777 CK73HB1A474K CHIP C 0.47UF K
C778 CK73GB1A105K CHIP C 1.0UF K
C779 CK73HB1E104K CHIP C 0.10UF K
C781 CK73HB1H102K CHIP C 1000PF K
C782 CK73HB1E104K CHIP C 0.10UF K
C783 CK73GB1A105K CHIP C 1.0UF K
C784,785 CK73HB1H103K CHIP C 0.010UF K
C786 CK73HB1A393K CHIP C 0.039UF K
C787 CK73HB1E103K CHIP C 0.010UF K
C788 CK73HB1H103K CHIP C 0.010UF K
C789,790 CK73HB1C333K CHIP C 0.033UF K
C793 CK73HB1C183K CHIP C 0.018UF K
C794 CK73HB1C822K CHIP C 8200PF K
C795 CK73HB1A224K CHIP C 0.22UF K
C796 CK73HB1H122K CHIP C 1200PF K
C797 CC73HCH1H390J CHIP C 39PF J
C798 CK73HB1A224K CHIP C 0.22UF K
C799 CK73GB0J475K CHIP C 4.7UF K
C800,801 CK73HB1H102K CHIP C 1000PF K
C802 CK73FB1A106K CHIP C 10UF K
C804 CK73HB1H103K CHIP C 0.010UF K
C805 CK73HB1H102K CHIP C 1000PF K
C806,807 CK73FB1A106K CHIP C 10UF K
C808,809 CK73GB1A105K CHIP C 1.0UF K
C810,811 CK73HB1E104K CHIP C 0.10UF K
C814 CK73FB1A106K CHIP C 10UF K
C815 CK73HB1E104K CHIP C 0.10UF K
C816 CK73HB1A224K CHIP C 0.22UF K
C817 CK73HB1H102K CHIP C 1000PF K
C818 CK73FB0J226M CHIP C 22UF M
C820-823 CK73HB1H102K CHIP C 1000PF K
C824 CK73HB1E104K CHIP C 0.10UF K
C825 CK73FB0J226M CHIP C 22UF M
C826 CK73HB1H102K CHIP C 1000PF K
C827 CK73FB1E475K CHIP C 4.7UF K
C828 CK73HB1H102K CHIP C 1000PF K
C829 CK73HB1H103K CHIP C 0.010UF K
C830 CK73HB1H102K CHIP C 1000PF K
C831 CE32CL1C470M ELECTRO 47UF 16WV
C832 CK73HB1E104K CHIP C 0.10UF K
C833-835 CK73HB1H102K CHIP C 1000PF K
C836 C90-4129-05 ELECTRO 330UF 25WV
C837 CK73HB1H103K CHIP C 0.010UF K
C838 CK73HB1H102K CHIP C 1000PF K
C839 C90-4129-05 ELECTRO 330UF 25WV
C840 CK73HB1E104K CHIP C 0.10UF K
C844 CK73HB1H102K CHIP C 1000PF K
C847 CK73HB1H102K CHIP C 1000PF K
C848-851 CK73FB1A106K CHIP C 10UF K
C853,854 CK73FB0J226M CHIP C 22UF M
C901-903 CK73HB1A104K CHIP C 0.10UF K
C910 CK73HB1H102K CHIP C 1000PF K
C912 CK73HB1H102K CHIP C 1000PF K
C915 CC73HCH1H101J CHIP C 100PF J
C916-918 CK73HB1H102K CHIP C 1000PF K
C920 CK73HB1H471K CHIP C 470PF K
C921 CK73GB1A105K CHIP C 1.0UF K
C922 CK73HB1H102K CHIP C 1000PF K
C924 CK73HB1A104K CHIP C 0.10UF K
C926,927 CC73HCH1H101J CHIP C 100PF J
C928 CK73HB1H681K CHIP C 680PF K
C929 CK73HB1H102K CHIP C 1000PF K
TC1 C05-0245-05
CERAMIC TRIMMER CAPACITOR (10PF)
TC2 C05-0399-05 CERAMIC TRIMMER CAPACITOR (6PF)
CN501 E23-1325-05 TERMINAL
CN702 ✽E40-6898-05 FLAT CABLE CONNECTOR (22P)
CN901 ✽E40-6897-05 FLAT CABLE CONNECTOR (22P)
J701 2B E11-0425-05 3.5D PHONE JACK (EXT SP)
J901 E58-0535-05 MODULAR JACK (MIC)
F701 F53-0327-15 FUSE (4A)
CD501 L79-1914-05 TUNING COIL
CF501 L72-1034-05 CERAMIC FILTER (450KHZ/WIDE)
CF502 L72-0999-05 CERAMIC FILTER (450KHZ/NARROW)
L1
✽L92-0622-15 CHIP FERRITE
L2 L41-1005-08 SMALL FIXED INDUCTOR (10UH)
L3
✽L92-0621-15 CHIP FERRITE
L5
✽L92-0620-15 CHIP FERRITE
L6-9 L40-2785-92 SMALL FIXED INDUCTOR (270NH)
L10 ✽L92-0622-15 CHIP FERRITE
L11 L41-4778-14 SMALL FIXED INDUCTOR (47NH)
L12 L41-3378-14 SMALL FIXED INDUCTOR (33NH)
L13-16 L40-2702-86 SMALL FIXED INDUCTOR (27UH)
L17 ✽L92-0622-15 CHIP FERRITE
L18 L40-3375-71 SMALL FIXED INDUCTOR (33NH)
L19 ✽L92-0622-15 CHIP FERRITE
L20 L40-1085-71 SMALL FIXED INDUCTOR (100NH)
L21 L40-3975-71 SMALL FIXED INDUCTOR (39NH)
L302 L40-2275-71 SMALL FIXED INDUCTOR (22NH)
L305 L40-1075-71 SMALL FIXED INDUCTOR (10NH)
L308 L40-8265-92 SMALL FIXED INDUCTOR (8.2NH)
L309 L40-1285-92 SMALL FIXED INDUCTOR (120NH)
L310 L40-4775-92 SMALL FIXED INDUCTOR (47NH)
L312-314 L92-0179-05 CHIP FERRITE
L315,316 L34-4902-05 AIR-CORE COIL (9.5T)

TM-281A
15
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-8130-XX)
L317 L34-1039-05 AIR-CORE COIL (1.5T)
L318-320 L34-4903-05 AIR-CORE COIL (5T)
L502-504 L40-3381-86 SMALL FIXED INDUCTOR (0.33UH)
L505 L40-3391-86 SMALL FIXED INDUCTOR (3.3UH)
L506,507 L41-3988-14 SMALL FIXED INDUCTOR (390NH)
L508 L40-4775-71 SMALL FIXED INDUCTOR (47NH)
L510,511 L41-6878-14 SMALL FIXED INDUCTOR (68NH)
L512 L41-3385-14 SMALL FIXED INDUCTOR (330NH)
L514,515 L41-6878-14 SMALL FIXED INDUCTOR (68NH)
L701,702 ✽L92-0622-15 CHIP FERRITE
L901 ✽L92-0621-15 CHIP FERRITE
X1 L77-1944-05 TCXO (16.8MHZ)
X701 ✽L78-1427-05 RESONATOR (8.00MHZ)
XF501 L71-0655-05 MCF (49.95MHZ)
CP901 RK75GB1J102J CHIP-COM 1.0K J 1/16W
R1 RK73HB1J104J CHIP R 100K J 1/16W
R2-4 RK73HB1J102J CHIP R 1.0K J 1/16W
R5 RK73HB1J103J CHIP R 10K J 1/16W
R6 RK73HB1J152J CHIP R 1.5K J 1/16W
R7 RK73HB1J100J CHIP R 10 J 1/16W
R8 RK73HB1J104J CHIP R 100K J 1/16W
R9 RK73HB1J471J CHIP R 470 J 1/16W
R10 RK73HB1J822J CHIP R 8.2K J 1/16W
R11 RK73HB1J103J CHIP R 10K J 1/16W
R12 RK73HB1J562J CHIP R 5.6K J 1/16W
R13 RK73HB1J103J CHIP R 10K J 1/16W
R15 RK73HB1J102J CHIP R 1.0K J 1/16W
R16 RK73HB1J000J CHIP R 0.0 J 1/16W
R17 RK73HB1J471J CHIP R 470 J 1/16W
R18 RK73HB1J000J CHIP R 0.0 J 1/16W
R19 RK73HB1J272J CHIP R 2.7K J 1/16W
R20 RK73HB1J102J CHIP R 1.0K J 1/16W
R21 RK73HB1J152J CHIP R 1.5K J 1/16W
R22 RK73HB1J223J CHIP R 22K J 1/16W
R23 RK73HB1J103J CHIP R 10K J 1/16W
R24 RK73HB1J104J CHIP R 100K J 1/16W
R25-27 RK73HB1J473J CHIP R 47K J 1/16W
R28 RK73HB1J221J CHIP R 220 J 1/16W
R29 RK73HB1J471J CHIP R 470 J 1/16W
R30 RK73HB1J104J CHIP R 100K J 1/16W
R31 RK73HB1J472J CHIP R 4.7K J 1/16W
R32 RK73HB1J221J CHIP R 220 J 1/16W
R33 RK73HB1J101J CHIP R 100 J 1/16W
R34 RK73HB1J102J CHIP R 1.0K J 1/16W
R35 RK73HB1J124J CHIP R 120K J 1/16W
R37 RK73HB1J000J CHIP R 0.0 J 1/16W
R38 RK73HB1J101J CHIP R 100 J 1/16W
R40 RK73HB1J102J CHIP R 1.0K J 1/16W
R41 RK73HB1J103J CHIP R 10K J 1/16W
R42 RK73HB1J822J CHIP R 8.2K J 1/16W
R43-45 RK73HB1J101J CHIP R 100 J 1/16W
R46 RK73HB1J222J CHIP R 2.2K J 1/16W
R304 RK73HB1J102J CHIP R 1.0K J 1/16W
R307 RK73HB1J000J CHIP R 0.0 J 1/16W
R312 RK73HB1J472J CHIP R 4.7K J 1/16W
R314 RK73HB1J223J CHIP R 22K J 1/16W
R326 RK73HB1J123J CHIP R 12K J 1/16W
R331,332 RK73HB1J100J CHIP R 10 J 1/16W
R333,334 RK73HB1J101J CHIP R 100 J 1/16W
R336 RK73HB1J470J CHIP R 47 J 1/16W
R337 RK73HB1J101J CHIP R 100 J 1/16W
R338 RK73HB1J154J CHIP R 150K J 1/16W
R339 RK73HB1J103J CHIP R 10K J 1/16W
R340 RK73HB1J223J CHIP R 22K J 1/16W
R341 RK73HB1J154J CHIP R 150K J 1/16W
R342 RK73HB1J152J CHIP R 1.5K J 1/16W
R344,345 RK73HB1J104J CHIP R 100K J 1/16W
R346 RK73EB2E221J CHIP R 220 J 1/4W
R347 RK73HB1J152J CHIP R 1.5K J 1/16W
R348 RK73HB1J153J CHIP R 15K J 1/16W
R349 RK73EB2E221J CHIP R 220 J 1/4W
R350 RK73HB1J100J CHIP R 10 J 1/16W
R351 RK73HB1J473J CHIP R 47K J 1/16W
R377,378 RK73HB1J103J CHIP R 10K J 1/16W
R380 2B R92-1061-05 JUMPER REST 0 OHM
R501 RK73HB1J124J CHIP R 120K J 1/16W
R502 RK73HB1J101J CHIP R 100 J 1/16W
R503 RK73HB1J682J CHIP R 6.8K J 1/16W
R504-507 RK73HB1J103J CHIP R 10K J 1/16W
R508 RK73HB1J682J CHIP R 6.8K J 1/16W
R509 RK73HB1J000J CHIP R 0.0 J 1/16W
R510 RK73HB1J102J CHIP R 1.0K J 1/16W
R511 RK73HB1J223J CHIP R 22K J 1/16W
R512 RK73HB1J564J CHIP R 560K J 1/16W
R514,515 RK73HB1J472J CHIP R 4.7K J 1/16W
R517 RK73HB1J182J CHIP R 1.8K J 1/16W
R519 RK73HB1J103J CHIP R 10K J 1/16W
R520 RK73HB1J474J CHIP R 470K J 1/16W
R521 RK73HB1J102J CHIP R 1.0K J 1/16W
R522 RK73HB1J101J CHIP R 100 J 1/16W
R523 RK73HB1J000J CHIP R 0.0 J 1/16W
R524 RK73HB1J394J CHIP R 390K J 1/16W
R525 RK73HB1J271J CHIP R 270 J 1/16W
R526 RK73HB1J000J CHIP R 0.0 J 1/16W
R527 RK73HB1J474J CHIP R 470K J 1/16W
R528 RK73HB1J102J CHIP R 1.0K J 1/16W
R529 RK73HB1J394J CHIP R 390K J 1/16W
R531 RK73HB1J101J CHIP R 100 J 1/16W
R532 RK73HB1J000J CHIP R 0.0 J 1/16W
R534 RK73HB1J221J CHIP R 220 J 1/16W
R535 RK73HB1J000J CHIP R 0.0 J 1/16W
R536 RK73HB1J561J CHIP R 560 J 1/16W
R537 RK73HB1J474J CHIP R 470K J 1/16W
R538 RK73HB1J224J CHIP R 220K J 1/16W
R539 RK73HB1J181J CHIP R 180 J 1/16W
R540 RK73HB1J473J CHIP R 47K J 1/16W
R541 RK73HB1J333J CHIP R 33K J 1/16W
R542 RK73HB1J000J CHIP R 0.0 J 1/16W
R543,544 RK73HB1J104J CHIP R 100K J 1/16W
R545 RK73HB1J102J CHIP R 1.0K J 1/16W
R546 RK73HB1J101J CHIP R 100 J 1/16W
R547 RK73HB1J000J CHIP R 0.0 J 1/16W
R549 RK73HB1J151J CHIP R 150 J 1/16W
R550 RK73HB1J103J CHIP R 10K J 1/16W
R551 RK73HB1J104J CHIP R 100K J 1/16W
R552 RK73HB1J473J CHIP R 47K J 1/16W
R553 RK73HB1J273J CHIP R 27K J 1/16W
R554,555 RK73HB1J104J CHIP R 100K J 1/16W
R556 RK73FB2B000J CHIP R 0.0 J 1/8W

TM-281A
16
Ref. No. Address Parts No. Description Desti-
nation
New
parts
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-8130-XX)
R557 RK73HB1J104J CHIP R 100K J 1/16W
R558 RK73HB1J473J CHIP R 47K J 1/16W
R559 RK73HB1J273J CHIP R 27K J 1/16W
R560 RK73HB1J000J CHIP R 0.0 J 1/16W
R701 RK73HB1J000J CHIP R 0.0 J 1/16W
R702,703 RK73HB1J101J CHIP R 100 J 1/16W
R704,705 RK73HB1J102J CHIP R 1.0K J 1/16W
R706 RK73HB1J000J CHIP R 0.0 J 1/16W
R707 RK73HB1J102J CHIP R 1.0K J 1/16W
R708 RK73HB1J000J CHIP R 0.0 J 1/16W
R710,711 RK73GH2A153D CHIP R 15K D 1/10W
R713 RK73HB1J821J CHIP R 820 J 1/16W
R714 RK73HB1J104J CHIP R 100K J 1/16W
R715 RK73HB1J681J CHIP R 680 J 1/16W
R716 RK73HB1J101J CHIP R 100 J 1/16W
R717 RK73HB1J103J CHIP R 10K J 1/16W M4
R717 RK73HB1J183J CHIP R 18K J 1/16W K,M2,M3
R718 RK73HB1J152J CHIP R 1.5K J 1/16W
R719 RK73HB1J122J CHIP R 1.2K J 1/16W
R721 RK73HB1J105J CHIP R 1.0M J 1/16W M4
R721 RK73HB1J754J CHIP R 750K J 1/16W K,M2,M3
R722 RK73HB1J152J CHIP R 1.5K J 1/16W
R723 RK73HB1J912J CHIP R 9.1K J 1/16W
R724 RK73HB1J682J CHIP R 6.8K J 1/16W
R725 ✽RK73HB1J244J CHIP R 240K J 1/16W
R726 RK73HB1J183J CHIP R 18K J 1/16W
R727 RK73HB1J334J CHIP R 330K J 1/16W
R728 RK73HB1J823J CHIP R 82K J 1/16W
R729 RK73HB1J124J CHIP R 120K J 1/16W
R730 RK73HB1J823J CHIP R 82K J 1/16W
R733 RK73HB1J684J CHIP R 680K J 1/16W
R734 RK73HB1J224J CHIP R 220K J 1/16W
R735 RK73HB1J274J CHIP R 270K J 1/16W
R736,737 RK73HB1J103J CHIP R 10K J 1/16W
R738 RK73HB1J683J CHIP R 68K J 1/16W
R739 RK73HB1J223J CHIP R 22K J 1/16W
R740 RK73HB1J683J CHIP R 68K J 1/16W
R741 RK73HB1J154J CHIP R 150K J 1/16W
R742 RK73HB1J124J CHIP R 120K J 1/16W
R743-745 RK73HB1J102J CHIP R 1.0K J 1/16W
R746 RK73HB1J823J CHIP R 82K J 1/16W
R747 RK73HB1J104J CHIP R 100K J 1/16W
R748 RK73HB1J223J CHIP R 22K J 1/16W
R749 RK73HB1J562J CHIP R 5.6K J 1/16W
R750,751 RK73HB1J102J CHIP R 1.0K J 1/16W
R752-755 RK73HB1J473J CHIP R 47K J 1/16W
R756 RK73HB1J103J CHIP R 10K J 1/16W
R757 RK73HB1J473J CHIP R 47K J 1/16W
R758 RK73HB1J000J CHIP R 0.0 J 1/16W
R759 RK73HB1J102J CHIP R 1.0K J 1/16W
R760,761 RK73HB1J473J CHIP R 47K J 1/16W
R762 RK73HB1J103J CHIP R 10K J 1/16W
R763 RK73HB1J000J CHIP R 0.0 J 1/16W
R764 RK73GB2A000J CHIP R 0.0 J 1/10W
R765 RK73HB1J102J CHIP R 1.0K J 1/16W
R766-768 RK73GB2A000J CHIP R 0.0 J 1/10W K
R767,768 RK73GB2A000J CHIP R 0.0 J 1/10W M4
R768 RK73GB2A000J CHIP R 0.0 J 1/10W M3
R769 RK73HB1J102J CHIP R 1.0K J 1/16W
R770 RK73HB1J000J CHIP R 0.0 J 1/16W
R771 RK73HB1J473J CHIP R 47K J 1/16W
R772 RK73HB1J103J CHIP R 10K J 1/16W
R773 RK73HB1J000J CHIP R 0.0 J 1/16W
R774 RK73HB1J472J CHIP R 4.7K J 1/16W
R775 RK73HB1J102J CHIP R 1.0K J 1/16W
R776 RK73HB1J152J CHIP R 1.5K J 1/16W
R777,778 RK73HB1J103J CHIP R 10K J 1/16W
R779-781 RK73HB1J473J CHIP R 47K J 1/16W
R782 RK73HB1J102J CHIP R 1.0K J 1/16W
R783 RK73HB1J393J CHIP R 39K J 1/16W
R784 RK73HB1J153J CHIP R 15K J 1/16W
R785 RK73HB1J123J CHIP R 12K J 1/16W
R786 RK73HB1J154J CHIP R 150K J 1/16W
R787 RK73HB1J124J CHIP R 120K J 1/16W
R789 RK73HB1J224J CHIP R 220K J 1/16W
R790 RK73HB1J123J CHIP R 12K J 1/16W
R791 RK73GH2A124D CHIP R 120K D 1/10W
R792 RK73GH2A562D CHIP R 5.6K D 1/10W
R793 RK73GH2A913D CHIP R 91K D 1/10W
R794 RK73HB1J124J CHIP R 120K J 1/16W
R795 RK73GH2A562D CHIP R 5.6K D 1/10W
R796 RK73HB1J183J CHIP R 18K J 1/16W
R797 RK73HB1J272J CHIP R 2.7K J 1/16W
R799 RK73HB1J474J CHIP R 470K J 1/16W
R800 RK73HB1J562J CHIP R 5.6K J 1/16W
R801 RK73HB1J000J CHIP R 0.0 J 1/16W
R802 RK73HB1J473J CHIP R 47K J 1/16W
R803 RK73HB1J392J CHIP R 3.9K J 1/16W
R804 RK73HB1J123J CHIP R 12K J 1/16W
R805 RK73HB1J562J CHIP R 5.6K J 1/16W
R806 RK73HB1J272J CHIP R 2.7K J 1/16W
R807 RK73HB1J105J CHIP R 1.0M J 1/16W
R808 RK73HB1J153J CHIP R 15K J 1/16W
R809 RK73HB1J471J CHIP R 470 J 1/16W
R810 RK73HB1J153J CHIP R 15K J 1/16W
R811 RK73HB1J000J CHIP R 0.0 J 1/16W
R812 RK73HB1J222J CHIP R 2.2K J 1/16W
R813 RK73HB1J473J CHIP R 47K J 1/16W
R814 RK73HB1J152J CHIP R 1.5K J 1/16W
R815 RK73HB1J472J CHIP R 4.7K J 1/16W
R816,817 RK73HB1J473J CHIP R 47K J 1/16W
R818 RK73HB1J683J CHIP R 68K J 1/16W
R819 RK73HB1J123J CHIP R 12K J 1/16W
R820 RK73HB1J221J CHIP R 220 J 1/16W
R821 RK73HB1J473J CHIP R 47K J 1/16W
R822 RK73HB1J334J CHIP R 330K J 1/16W
R823 RK73HB1J391J CHIP R 390 J 1/16W
R824 RK73HB1J474J CHIP R 470K J 1/16W
R825 RK73HB1J394J CHIP R 390K J 1/16W
R826 RK73HB1J473J CHIP R 47K J 1/16W
R827 RK73HB1J334J CHIP R 330K J 1/16W
R828,829 RK73HB1J000J CHIP R 0.0 J 1/16W
R830-833 RK73FB2B000J CHIP R 0.0 J 1/8W
R834 RK73HB1J102J CHIP R 1.0K J 1/16W
R835 RK73HB1J000J CHIP R 0.0 J 1/16W K
R836 RK73HB1J000J CHIP R 0.0 J 1/16W M2
R837 RK73HB1J000J CHIP R 0.0 J 1/16W M3
R838 RK73HB1J000J CHIP R 0.0 J 1/16W M4
R841,842 RK73HB1J103J CHIP R 10K J 1/16W
R843 RK73HB1J473J CHIP R 47K J 1/16W

TM-281A
17
PARTS LIST
Ref. No. Address Parts No. Description Desti-
nation
New
parts
Ref. No. Address Parts No. Description Desti-
nation
New
parts
TX-RX UNIT (X57-8130-XX)
R844 RK73HB1J103J CHIP R 10K J 1/16W
R901 RK73HB1J000J CHIP R 0.0 J 1/16W
R902,903 RK73HB1J472J CHIP R 4.7K J 1/16W
R904-906 RK73HB1J000J CHIP R 0.0 J 1/16W
R908 RK73HB1J101J CHIP R 100 J 1/16W
R909 RK73HB1J102J CHIP R 1.0K J 1/16W
R910-912 RK73HB1J103J CHIP R 10K J 1/16W
R913 RK73HB1J563J CHIP R 56K J 1/16W
R914 RK73HB1J102J CHIP R 1.0K J 1/16W
R915 RK73HB1J152J CHIP R 1.5K J 1/16W
R916 RK73HB1J183J CHIP R 18K J 1/16W
R917 RK73HB1J392J CHIP R 3.9K J 1/16W
R918 RK73HB1J821J CHIP R 820 J 1/16W
R919 RK73HB1J272J CHIP R 2.7K J 1/16W
R920 RK73HB1J183J CHIP R 18K J 1/16W
R921 RK73HB1J104J CHIP R 100K J 1/16W
R922-924 RK73HB1J331J CHIP R 330 J 1/16W
VR901 R31-0662-05 VARIABLE RESISTOR
D1 HZU5ALL DIODE
D2 DA2S101 DIODE
D3-6 ✽HVC359 VARIABLE CAPACITANCE DIODE
D7 1SV278F VARIABLE CAPACITANCE DIODE
D8 DA2S101 DIODE
D9,10 HSC277 DIODE
D301 UDZW5.1(B) ZENER DIODE
D305 DA2S101 DIODE
D306,307 L407CDB DIODE (50V/1W)
D309 ✽JDP2S12CR DIODE
D311 ✽JDP2S12CR DIODE
D312 RB521S-30 DIODE
D313,314 HSB88AS-E DIODE
D316 RB521S-30 DIODE
D501,502 MC2858-T111 DIODE
D503 HSB88AS-E DIODE
D504 DA2S101 DIODE
D505,506 1SV325F VARIABLE CAPACITANCE DIODE
D508,509 1SV325F VARIABLE CAPACITANCE DIODE
D702 MC2850 DIODE
D704-706 MC2850 DIODE
D708 DA2S101 DIODE
D709 1SS372F DIODE
D710 DA2S101 DIODE
D711 1SS372F DIODE
D712 UDZW18(B) ZENER DIODE
D714 Z5W27V SURGE ABSORBER
D901 1SS355 DIODE
D902 UDZW6.2(B) ZENER DIODE
IC1 MB15A02PFV2E1 MOS-IC
IC2 UPB1509GV BI-POLAR IC
IC302 1B
✽RA60H1317M231 MOS-IC (POWER MODULE)
IC303 NJM12904RB1 MOS-IC
IC501 UA31136L MOS-IC
IC703 NJM2100V-ZB MOS-IC
IC704 NJM12904RB1 MOS-IC
IC705 M62363FP-F MOS-IC
IC706 BA10324AFV MOS-IC
IC707 30622MEP540GU MICROCONTROLLER IC
IC708 EX24064ASAS0A ROM IC
IC709 BA10324AFV MOS-IC
IC710 XC6209B502P-G MOS-IC
IC711 ✽TA7808F-NQ ANALOGUE IC
IC712 XC61CN4002MR MOS-IC
IC713 TA7805F-NQ MOS-IC
IC714 ✽XC61CN3202MR MOS-IC
IC715 1A LA4600 BI-POLAR IC
IC901 PT6554LQ MOS-IC
Q1 2SA1832(GR)F TRANSISTOR
Q2 2SC4738(GR)F TRANSISTOR
Q3 2SC4649(N,P) TRANSISTOR
Q4 MCH3914(7)-H FET
Q5 2SJ347F FET
Q6 MCH3914(7)-H FET
Q7 UMC4N TRANSISTOR
Q8 KTC4075E(Y,GR) TRANSISTOR
Q9,10 2SC5108(Y)F TRANSISTOR
Q303 RD00HVS1-T113 FET
Q501 KTC4080E-P TRANSISTOR
Q502 2SC4617(S) TRANSISTOR
Q503 KTC4080E-P TRANSISTOR
Q504 3SK318 FET
Q505 3SK294-FP FET
Q506 2SK1830F FET
Q701-703 2SC4919-S TRANSISTOR
Q704,705 2SK3019 FET
Q706 2SC2412K TRANSISTOR
Q707-709 RT1N141U-T111 TRANSISTOR
Q710,711 2SB1694 TRANSISTOR
Q712 DTC363EU DIGITAL TRANSISTOR
Q713 RT1N141U-T111 TRANSISTOR
Q714 2SJ645 FET
Q715 RT1N141U-T111 TRANSISTOR
Q901 RT1P141U-T111 TRANSISTOR
Q902 RT1N141U-T111 TRANSISTOR
Q903 2SB1132(Q,R) TRANSISTOR
Q904 UMG3N TRANSISTOR
TH501 NCP18WM474J0S THERMISTOR
TH702,703 NCP18WF104J03 THERMISTOR
S901 W02-3704-05 ENCODER
If a part reference number is listed in a shaded box, that part does not come with the PCB.

TM-281A
18
EXPLODED VIEW
Parts with the exploded numbers larger than 700 are not supplied.
If a part reference number is listed in a box on the exploded view of the PCB, that part does not come with the PCB.
These parts must be ordered separately.
BA
3
2
1
1
10
2
11
13
15
IC302
R380
IC715
J701
B
B
B
B
DDx2
Dx4
X57 A/2
X57 A/2
TX-RX unit (B/2)
Display section
TX-RX unit (A/2)
TX-RX section Dx2
D
D
D
D
A
A
700
702
703
A : N35-2604-43
B : N67-3008-48
C : N80-2008-48
D : N87-2608-48
3
5
6
12
19
19
16
20
27
30
31
32
36
C
C

TM-281A
19
PACKING
Parts with the exploded numbers larger than 700 are not supplied.
3
2
1
DC
37 Microphone
(T91-0624-65): M2
(T91-0641-75): K,M3,M4
M2K,M3,M4
14 DC cord
(E30-7744-05)
18 Fuse (Blade type) 15A
(F52-0024-05)
26 Holder (MIC)
(J19-1584-15)
34 Screw set
(N99-2082-05)
28 Bracket
(J29-0726-03)
711 Pamphlet
712 Warranty card: K
7 Instruction manual
(B62-2347-10): K,M2
(B62-2348-10): M3
(B62-2349-10): M4
713 Protection bag
22 Packing fixture
(H12-4330-02)
23 Packing fixture
(H12-4331-02)
24 Item carton case
(H52-2503-02): K
710 Protection bag

TM-281A
20
Measuring Equipment for Alignment
1. Digital voltmeter (DVM)
Input impedance: High
2. RF voltmeter (RF VM)
Input impedance: 1MΩor more, 2pF or less
Voltage range: Full scale=10mV to 300V
Measurable frequency range: Up to 200MHz
3. Frequency counter (f.counter)
Input sensitivity: About 50mV
Frequency range: 10Hz to 1000MHz
4. DC power supply
Voltage: Variable in the range 9 to 17V
Current: 14A or more
5. Power meter
Measurement power: 65W, 25W
Impedance: 50Ω
Measurable frequency: Up to 200MHz
6. AF voltmeter (AF VM)
Input impedance: 1MΩor more
Voltage range: Full scale=1mV to 30V
Measurable frequency range: 50Hz to 10kHz
7. AF generator (AG)
Output frequency: 100Hz to 10kHz
Output voltage: 0.5mV to 1V
8. Linear detector
Measurable frequency: Up to 200MHz
9. Spectrum analyzer
Measuring range: 10kHz to 1GHz or more
10. Oscilloscope
High sensitivity with horizontal input terminal
11. Standard signal generator (SSG)
Frequency range: 136 to 174MHz
Output: –133dBm (0.05µV) to greater than –13dBm
(50mV)
12. Dummy load (for AF)
8
Ω, about 5W
13. Sweep generator
The sweep generator must be able to sweep the fre-
quency range of 30 to 300MHz.
14. Tracking generator
Output voltage: 100mV or more
Preparation
• Set the controls and switches to the positions listed be-
low unless otherwise specified.
Volume control : Fully counterclockwise
Power switch : OFF
CM
HOOK
MIC
ME
PTT
GND
8C
MBL
:
@
.
;
=
B
>
2
Microphone socket
(as viewed from the front of the transceiver)
• To protect the signal generator, never connect the micro-
phone to the microphone socket when the receiver sec-
tion is adjusted.
• Before the power cord is connected, make sure the pow-
er switch is off.
• Without specification of SSG, standard modulation is ap-
plied (MOD: 1kHz, DEV: ±3kHz)
ADJUSTMENT