Kenwood TM-471A User manual

© 2003-10 PRINTED IN JAPAN
B51-8664-00 (N)179
UHF FM TRANSCEIVER
TM-471A
SERVICE MANUAL
CIRCUIT DESCRIPTION ............................ 2
SEMICONDUCTOR DATA ........................ 8
COMPONENTS DESCRIPTION ................ 9
PARTS LIST ............................................. 10
EXPLODED VIEW.................................... 17
PACKING ................................................. 18
RESETTING THE TRANSCEIVER ........... 19
ADJUSTMENT ........................................ 20
TERMINAL FUNCTION ........................... 27
PC BOARD
DISPLAY UNIT (X54-3450-10) ............ 28
TX-RX UNIT (X57-686X-XX)............... 30
SCHEMATIC DIAGRAM.......................... 34
BLOCK DIAGRAM ................................... 38
LEVEL DIAGRAM .................................... 40
SPECIFICATION ................... BACK COVER
CONTENTS
Microphone
(T91-0641-05)
Cabinet
(A01-2193-01)
Panel assy
(A62-1102-03)
Knob (Encoder)
(K29-9293-03)
Key top
(K29-9291-01)
Knob (Volume)
(K29-9292-03)

TM-471A
2
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 necessary
frequencies. Figure 1 shows the frequencies.
CIRCUIT DESCRIPTION
Receiver System
The receiver is 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 (Q353) after passing through a transmit/receive
switch circuit (D603, D604 and D605 are off) and a BPF
(L359, L358 L360, L361 and varactor diodes : D353, D354,
D355). After the signal is amplified (Q353), the signal is fil-
tered by a BPF (L354, L355 and varactor diodes: D351, D352)
to eliminate unwanted signals before it is passed to the first
mixer.
The voltage of these diodes are controlled by tracking the
CPU (IC101) 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 synthesizer
circuit at the first mixer (Q352) to create a 49.95MHz first
intermediate frequency (1st IF) signal. The first IF signal is
then fed through one pair of monolithic crystal filter (MCF :
XF351) to further remove spurious signals.
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
Fig. 1 Frequency configuration
■IF Amplifier
The first IF signal is amplified by Q351, and then goes to
IC301 (FM processing IC). The signal is heterodyned again
with a second local oscillator signal within IC301 to create a
450kHz second IF signal. The second IF signal is then fed
through a 450kHz ceramic filter (Wide : CF301, Narrow :
CF302) to further eliminate unwanted signals before it is am-
plified and FM detected in IC301.
Item Rating
Nominal center frequency 49.95MHz
Pass bandwidth ±5.0kHz or more at 3dB
35dB stop bandwidth ±20.0kHz or less
Ripple 1.0dB or less
Insertion loss 5.0dB or less
Guaranteed attenuation 80dB or more at fo±1MHz
Spurious 40dB or more
Terminal impedance 350Ω/ 5.5pF
Table 1 Crystal filter (L71-0620-05) : XF351
Item Rating
Nominal center frequency 450kHz
6dB bandwidth ±6.0kHz or more
50dB bandwidth ±12.5kHz or less
Ripple 2.0dB or less
Insertion loss 6.0dB or less
Guaranteed attenuation 35.0dB or more within fo±100kHz
Terminal impedance 2.0kΩ
Table 2 Ceramic filter (L72-0993-05) : CF301
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
Terminal impedance 2.0kΩ
Table 3 Ceramic filter (L72-0999-05) : CF302
ANT
L358~361
D353~355
BPF
Q353
RF AMP
Q351
IF AMP
IC161
D/A CONVERTER
Q352
MIX
XF351
MCF
D601~
D604
ANT
SW
IC203
DC AMP
IC161
D/A
Q302
X3 multiply
X401
TCXO
IC301
IF system
1st local
OSC (VCO/PLL)
W/NO
(EVOL2)
CF301 (Wide)
CF302 (Narrow)
TV
CPU
L354,355
D351,352
BPF
Fig. 2 Receiver system

TM-471A
3
■Wide/Narrow Switching Circuit
The Wide port (pin 65) and Narrow port (pin 64) of the CPU
is used to switch between ceramic filters. When the Wide
port is high, the ceramic filter SW diodes (D303, D302) cause
CF301 to turn on to receive a Wide signal.
When the Narrow port is high, the ceramic filter SW diodes
(D303, D302) cause CF302 to turn on to receive a Narrow sig-
nal. (See Fig. 3.)
■AF Signal System
The detection signal from IF IC (IC301) goes to D/A con-
verter (IC161) to adjust the gain and is output to AF filter
(IC251) for characterizing the signal. The AF signal output
from IC251 and the DTMF signal, BEEP signal are summed
and the resulting signal goes to the D/A converter (IC161).
The AFO output level is adjusted by the D/A converter. The
signal output from the D/A converter is input to the audio
power amplifier (IC252). The AF signal from IC252 switches
between the internal speaker and speaker jack (J1) output.
(See Fig. 4.)
■Squelch Circuit
The detection output from the FM IF IC (IC301) passes
through a noise amplifier (Q301) to detect noise. A voltage is
applied to the CPU (IC101). The CPU controls squelch ac-
cording to the voltage (SQIN) level. The signal from the RSSI
pin of IC301 is used for S-meter. The electric field strength of
the receive signal can be known before the SQIN voltage is
input to the CPU, and the scan stop speed is improved.
Narrow
IC101 64pin
IF_IN MIX_O
IC301
IF System
CF302
(Narrow)
CF301
(Wide)
R320 R319
R317
R318
D303 D302
Wide
IC101 65pin
AF
Filter
D/A
CONV.
D/A
CONV.
IC161 IC251 IC161
W/NO
(EVOL2) AF PA
IC252 SP
IF IC
IC301
Q301
NOISE AMP D301IC301 IC101
AFO
RSSI
DET
CPU
IF
SYSTEM
SQIN
RSSI
Fig. 3 Wide/Narrow switching circuit
Fig. 4 AF signal system
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 IC401 by a
fixed counter to produce the 5 or 6.25kHz reference fre-
quency. The voltage controlled oscillator (VCO) output signal
is buffer amplified by Q410, then divided in IC401 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 IC401. 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
The operating frequency is generated by Q406 in trans-
mit mode and Q405 in receive mode. The oscillator fre-
quency is controlled by applying the VCO control voltage,
obtained from the phase comparator, to the varactor diodes
(D405 and D406 in transmit mode and D403 and D404 in
receive mode). The TX/RX pin is set high in receive mode
causing Q408 and Q407 to turn Q406 off, and turn Q405 on.
The TX/RX pin is set low in transmit mode. The outputs
from Q405 and Q406 are amplified by Q410 and sent to the
RF amplifiers. (See Fig. 6.)
D405,406
Q406
TX VCO
Q410
BUFF
AMP
D403,404
Q405
RX VCO
Q407,408
T/R SW
Charge
pump
LPF
Phase
comparator
1/M
1/N 5kHz/6.25kHz
5kHz/6.25kHz
REF
OSC
16.8MHz
PLL
DATA
IC401 : PLL IC
Q404
AMP
RF amplifiers
Q402,403
TX/RX (CPU)
Fig. 6 PLL circuit
CIRCUIT DESCRIPTION

TM-471A
4
■Unlock Circuit
During reception, the 8RC signal goes high, the 8TC signal
goes low, and Q34 turns on. Q33 turns on and a voltage is
applied to 8R. During transmission, the 8RC signal goes low,
the 8TC signal goes high and Q36 turns on. Q35 turns on and
a voltage is applied to 8T.
The CPU monitors the PLL (IC401) LD signal directly.
When the PLL is unlocked during transmission, the PLL LD
signal goes low. The CPU detects this signal and makes the
8TC signal low. When the 8TC signal goes low, no voltage is
applied to 8T, and no signal is transmitted. (See Fig. 7.)
IC101
CPU
Q34
SW
Q33
SW
IC401
PLL
Q36
SW
Q35
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
the transmission/reception selection diode (D409) and ampli-
fied by Q500, Q501, Q502 and Q503. The amplified signal
goes to the final amplifier (Q504) through a low-pass filter.
The low-pass filter removes unwanted high-frequency har-
monic components, and the resulting signal is transmitted
through the antenna terminal. (See Fig. 8.)
■APC Circuit
The automatic transmission power control (APC) circuit
detects part of a final amplifier (Q504) output with a diode
(D606, D607) and applies a voltage to IC501. IC501 com-
pares the APC control voltage (PC) generated by the D/A con-
verter (IC161) and DC amplifier (IC203) with the detection
output voltage. IC501 generates the voltage to control Q502,
Q503 and Q504 and stabilizes transmission output.
The APC circuit is configured to protect over current of
Q502, Q503 and Q504 due to fluctuations of the load at the
antenna end and to stabilize transmission output at voltage
and temperature variations. (See Fig. 9.)
RF
AMP
Q500
DRIVE
AMP2
Q503
DRIVE
AMP1
Q502
FINAL
AMP
Q504
PRE
DRIVE
AMP
Q501
DC
AMP
IC203
ANT
SW
D601~D605
LPF
ANT
POWER
DET
D606
D607
IC501
APC
CONTROL
D409
IC161
(PC/TVO)
VR601
(PC)
Fig. 9 APC circuit
Fig. 8 Transmitter system
CIRCUIT DESCRIPTION
Q500
RF AMPRF AMP
Q501
PRE
DRIVE AMP
Q503
ANT
DRIVE
AMP 2
Q502
DRIVE
AMP 1
Q504
FINAL
AMP
Q411
IC161 Q406
D/A
CONVERTER
D/A
CONVERTER
D/A
CONVERTER
X401
TCXO
16.8MHz
VCO
IC401
PLL
Q410
BUFFER
Q404
RF AMP
IC203
BUFFER
IC101
IC161
MIC KEY
INPUT CPU
IC161
IC203
SUM
AMP
IC202IC201
MIC
MIC/IDC SPLATTER
FILTER

TM-471A
5
Control Circuit
The CPU carries out the following tasks (See Fig. 10.):
1) Controls the WIDE, NARROW, TX/RX outputs.
2) Adjusts the AF signal level of the AF filter (IC251) and
turns the filter select compounder on or off.
3) Controls the display unit.
4) Controls the PLL (IC401).
5) Controls the D/A converter (IC161) and adjusts the vol-
ume, modulation and transmission power.
■Memory Circuit
The transceiver has an 64k-bit EEPROM (IC66). The
EEPROM contains adjustment data. The CPU (IC101) con-
trols the EEPROM through three serial data lines. (See Fig.
11.)
IC161
D/A
converter
IC401
PLL
IC101
CPU
LD
DT
CK
PLLE
EEPCK
IC101
CPU
IC66
EEPROM
EEPSDT
EEPWP
■ Display Circuit
The CPU (IC101) controls the display LCD and LEDs.
When power is on, the LCD driver will use the BL line to con-
trol the LCD illumination and key backlight LEDs.
The brightness function is controlled by the switch Q12.
The LCD driver (IC3) and CPU (IC101) communicate through
the CE, CL, DI, DO lines. (See Fig. 12.)
■Key Matrix Circuit
The TM-471 front panel has function keys. Each of them
is connected to a cross point of a matrix of the KI1 to KI3 and
KS1 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 corre-
sponding to that port has been pressed.
■Encode
The DCS and CTCSS signals are output from QT/DQT of
the CPU (IC101) and summed with the external pin DI line by
the summing amplifier (IC203) and the resulting signal goes
to the D/A converter (IC161). The DTMF signal is output from
DTMF pin of the CPU and summed with a MIC signal by the
summing amplifier (IC203), and the resulting signal goes to
the D/A converter (IC161).
The D/A converter (IC161) adjusts the MOD level and the
balance between the MOD and CTCSS/DCS levels. Part of a
CTCSS/DCS signal is summed with MOD and the resulting
signal goes to the VCOMOD pin of the VCO. This signal is
applied to a varicap diode in the VCO for direct FM modula-
tion.
IC3
LCD
driver
KI1
KI2
KI3
KS2
KS1
FUNC
REV
CALL
VFO
MR
MHz
(Encoder)
X401
TCXO
IC161
D/A VCO
IC203
SUM
AMP
IC203
SUM
AMP
IC401
PLL
TCXO
MOD
VCO
MOD
Amp
DI
QT/DQT
(CPU1)
DTMO
(EVOL15)
IC101
CPU
TONE
DTMF
Fig. 10 Control circuit
Fig. 11 Memory circuit
Q10
SW
Q6
SW
IC101
CPU
D2~D4
Q9
SW D19~D30
Q12
SW
IC3
LCD
driver
CE
CL
DI
DO
BL
COM0~
COM3
SEG0~
SEG30
LCD
BRI
Fig. 12 Display circuit
Fig. 13 Key matrix circuit
Fig. 14 Encoder
CIRCUIT DESCRIPTION

TM-471A
6
■Decode
• CTCSS/DCS
The signal (W/NO (EVOL2)) goes to DTMF IN (pin 95) of
CPU (IC101). The CTCSS/DCS signal will pass through the
low-pass filters in the CPU (IC101) and be decoded within the
CPU (IC101). The DTMF signal will be decoded within the
CPU (IC101).
■D/A Converter
The D/A converter (IC161) is used to adjust MO modula-
tion, AF volume, TV voltage, FC reference voltage, and PC
POWER CONTROL voltage level.
Adjustment values are sent from the CPU 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
n: Serial data value from the microprocessor (CPU)
Power Supply Circuit
When the power switch on the display unit is pressed, the
power port on the display unit which is connected port 17
(POWER), goes low, then port 82 (SBC) goes high, Q32 turns
on, SB SW (Q31) turns on and power (SB) is supplied to the
radio.
When the DC power supplied to the radio, the voltage
regulator IC (IC33) supply into the CPU VDD and reset voltage
detect IC (IC34). IC34 will generate signal (RESET) in to the
reset terminal on the CPU (IC101) to carry out a power ON
reset. If DC power is less than about 9.5V, the radio is unable
to power on.
When the DC power voltage deceases from normal volt-
age, the INT voltage detector IC (IC35) will set to high on CPU
port 18 (INT) if B line will became less than about 9.5V. Then
CPU send to EEPROM (IC66) the backup data and go into
STOP mode.
This circuit has an overvoltage protection circuit. If a DC
voltage of 18V or higher is applied to the base of Q61, this
voltage turns Q61 on and will set to high on CPU port 18
(INT). Then CPU send to EEPROM (IC66) the backup data
and go into stop mode. (See Fig. 16.)
IC101
CPU
DTMF IN W/NO (EVOL2)
95
Q71
SW
Q31
SW
Q32
SW
Q61
SW
IC33
AVR
D61D62
B
IC34
RST
SBC
IGN
R77R76
R39R40
INT
5M
BATT
IC101
CPU
POWER
SW
POWER
RESET
5M
IC35
INT
SB
IGN
Fig. 15 Decode
Fig. 16 Power supply circuit
CIRCUIT DESCRIPTION
Data Terminal and Peripheral Circuits
CN2 (data terminal) is the data communications terminal
on the TX/RX PCB. It handles transmission control, data in-
put/output, and squelch signals.
There are two data communications modes : 9600bps
mode and 1200bps mode. Unlike with 1200bps AFSK, with
this type of high-speed modulation, frequency modulation is
carried out after the digital base band signals (rectangular
wave) are passed through a band limiting filter. For 9600bps
GMSK for example, compared to 4800Hz signals (nearly sine
wave signals passed through a filter), these signals have a
hissing sound like digital modulation when listened to by ear.
Different types of modulation, such as GMSK is distin-
guished by the type of band limiting filter.
Pin Pin Specification
No. Name
1PKD bps switching 1200bps 9600bps
Modulation input 400mVp-p 4Vp-p
Frequency shift 3±0.5kHz 2.2±0.5kHz
4PR9 Output level 500mVp-p/10kΩ
Always output during reception
5PR1 Output level 500mVp-p/10kΩ
Not output when squelch off
Table 4 Data terminal input/output level

TM-471A
7
■ Transmission Signals
Transmission modulation signals enter from PKD of the
data terminal (CN2). The path to the modulation depends on
whether communications are 1200bps or 9600bps mode.
For 1200bps mode, the transmission modulation signals
from single analog switch (IC204) pass through MIC amplifier
(IC201,202) and summing amplifier (IC203), and go to VCO
(X401) through D/A converter (IC161).
For 9600bps mode, the transmission modulation signals
from single analog switch (IC205) pass through summing
amplifier (IC303), go to TCXO (X401) and VCO through D/A
converter (IC161). (See Fig. 17.)
■ Reception Signals
PR9 is the 9600bps data communications reception out-
put. It outputs the FM detection circuit output through an AF
filter (IC251). These signals are always output whether the
squelch is open or closed.
PR1 is the 1200bps data communications reception out-
put. It outputs the FM detection circuit output through an AF
filter (IC251). Output is controlled with the mute switch
(Q252) according to whether squelch is open or closed. (See
Fig. 17.)
■ Squelch Signal Output Circuit
The squelch circuits is input to the TNC to prevents con-
flicts from occurring between simultaneous receive mode
and transmit mode traffic during packet communications
(only during 1200bps). The signal is output from pin 29 of
IC101 to the data terminal. The logic is as shown in the table
below.
SQC terminal output L : SQ CLOSE
CN2 H : SQ BUSY
IC204
Analog
switch
IC201,202
MIC amp
IC203
Sum amp
IC205
Analog
switch
IC251
AF filter
76
75
IC101
CPU
1200bps
9600bps VCO, TCXO,
D/A converter
D/A converter
Q252
Mute SW
D6
D5
PKS (CPU) pin 30
SQC (CPU) pin 29
PKD
PR9
PR1
PKS
SQC
CN2
Fog. 17 Data terminal and peripheral circuits
CIRCUIT DESCRIPTION

TM-471A
8
SEMICONDUCTOR DATA
■Terminal Function
Pin No. Name I/O Function
1TONE O CTCSS/DCS/Clone output
2DTMF O DTMF/BEEP/1750Hz output
3PLLE O PLL IC chip select
4,5 NC I
6GND - GND
7CNVSS -
8EVLLD O
9BSHIFT O Beat shift
10 RESET - Reset
11 XOUT - X’tal (8MHz)
12 VSS - GND
13 XIN - X’tal (8MHz)
14 VCC - +5V
15 NMI - (Input only)
16 NC I
17 POWER I Power key input
18 INT I µcom stop
19 NC I
20 TX/RX O TX/RX
21 UL I PLL unlock detect
22,23 NC I
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 SQC O Squelch signal output for TNC
(TxD for flash)
30 PKS I PTT input for TNC (RxD for flash)
31 CLKFLS I (GND)
32 BSYFLS O (Vcc)
33 TXD O To PC
34 RXD I From PC
35 PTT I PTT input
36~38 NC I
39 EMPFLS I/O (GND)
40~43 NC I
44 CEFLS I/O (Vcc)
45~49 NC I
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
56 DST1 I Destination 1
57~59 DST2~DST4 I Destination 2~4
60 VCC - +5V
61 NC I
62 VSS - GND
63 ADJ I For adjustment mode
64 NARROW O Wide/Narrow 2
65 WIDE O Wide/Narow
66,67 NC I
68 LCDCL O Clock for LCD
69 LCDCE O Chip enable for LCD
70 LCDDO O Output data to LCD
71 LCDDI I Input data from LCD
72 NC I
73 ENCB I Encoder input B
74 ENCA I Encoder input A
75 TNC9600 O TNC speed H : 9600, L : 1200
76 TNC1200 O TNC speed L : 9600, H : 1200
77 MICMT O MIC mute
78 NC I NC
79 8RC O 8R control
80 8TC O 8T control
81 NC I
82 SBC O Battery switch
83~85 NC I
86 CM I/O MIC key check
87 I For AMR DTMF keypad MIC
88 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/Clone/1050Hz input
96 VREF - +5V
97 AVCC - +5V
98~100 NC I
Microprocessor : 30622MAA-B85GP (TX-RX Unit IC101)

TM-471A
9
Display Unit (X54-3450-10)
Ref. No. Parts name Description
IC3 IC LCD controller
Q6 Transistor DC switch
Q9 Transistor LCD backlit switch
Q10 Transistor Key backlit switch
Q12 Transistor Brightness function switch
D2~4 LED Key backlit
D19~30 LED LCD backlit
D31 Diode Reverse connection protection
TX-RX Unit (X57-6863-XX)
Ref. No. Parts name Description
IC31 IC Voltage regulator (8C)
IC32 IC Voltage regulator (5C)
IC33 IC Voltage regulator (5M)
IC34 IC Voltage detector (reset)
IC35 IC Voltage detector (int)
IC66 IC EEPROM
IC101 IC CPU
IC161 IC Digital potentiometer
IC201 IC MIC amplifier / IDC
IC202 IC MIC amplifier / Splatter filter
IC203 IC Buffer amplifier / SUM amplifier /
DC amplifier / 1/2 Vcc
IC204,205 IC Single analog switch
IC251 IC Audio filter
IC252 IC Audio amplifier
IC301 IC FM demodulation
IC401 IC PLL synthesizer
IC501 IC APC controller
Q31,32 Transistor DC switch (SB) / Active when power is on
Q33,34 Transistor DC switch (8R) / Active while RX
Q35,36 Transistor DC switch (8T) / Active while TX
Q61 Transistor Over voltage detection / Active when
PS voltage is more than18V
Q86,87 Transistor Beat shift / Active while beat shift is on
Q201 Transistor AGC / MIC mute
Q251 Transistor Buffer amplifier / RX audio
Q252,253 FET AF mute / Active while AFM is H
Q254 Digital transistor AF mute / Active while SPM is H
Q255 Transistor AF mute / Active while AMPSW is H
Q301 Transistor SQL amplifier / Noise amplifier
Q302 Transistor Buffer amplifier / 16.8MHz 3rd over tone
Ref. No. Parts name Description
Q351 Transistor IF amplifier
Q352 FET Mixer
Q353 FET RF amplifier / LNA
Q354 FET PC/TV switch
Q402,403 Transistor Charge pump
Q404 Transistor RF amplifier / PLL F in
Q405 FET RX VCO
Q406 FET TX VCO
Q407 FET T/R SW
Q408 Transistor T/R SW
Q410 Transistor Buffer amplifier / Output of VCO
Q411 Transistor RF amplifier / Output of VCO
Q440 Transistor Lipple filter
Q500 Transistor RF switch (TX/RX)
Q501 Transistor RF amplifier / Predrive amplifier
Q502 Transistor RF amplifier / Drive amplifier 1
Q503 FET RF amplifier / Drive amplifier 2
Q504 FET RF amplifier / Final amplifier
D1 Diode Surge absorption / CM
D2 Diode Surge absorption / MIC key
D3 Diode Surge absorption / RXD
D4 Diode Surge absorption / PTT
D5 Diode Surge absorption / SQC
D6 Diode Surge absorption / PKS
D31 Diode Reverse connection protection
D32 Poly switch Current protection
D61,62 Diode Over voltage detection
D201 Diode OR gate / MIC mute, AGC
D202 Diode AGC
D251 Diode Limiter
D301 Diode Detection
D302,303 Diode IF switch (Wide/Narrow)
D351~355 Varicap RF BPF tuning
D401 Diode Ripple filter
D402 Diode Voltage dropped
D403,404 Varicap RX VCO
D405,406 Varicap TX VCO
D407 Varicap Modulation
D408 Diode Lipple filter
D409 Diode RF switch (TX/RX)
D502 Diode Temperature compensation
D503 Diode Voltage protectionV
D601~605 Diode ANT switch
D606,607 Diode APC voltage detectV
D608 Diode Temperature compensation
COMPONENTS DESCRIPTION

TM-471A
10
PARTS LIST
✽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
Y:AAFES (Europe) 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
TM-471A, DISPLAY UNIT (X54-3450-10)
TX-RX UNIT (X57-686X-XX)
11B✽A01-2193-01 CABINET
23BA10-4048-21 CHASSIS
33A✽A62-1102-03 PANEL ASSY
51D✽B62-1745-10 INSTRUCTION MANUAL
63B✽B72-2176-04 MODEL NAME PLATE C
63B✽B72-2177-04 MODEL NAME PLATE C2
83BE04-0167-05 RF COAXIAL PECEPTACLE (M)
10 3C E30-2111-15 DC CORD ACCESSORY
13 3B ✽E30-7512-05 DC CORD (RADIO)
14 3A E37-1082-05 SPEAKER WIRE
15 2A ✽E37-1097-05 FLAT CABLE
18 2B F10-2449-01 SHIELDING COVER
19 2B,3C F51-0017-05 FUSE (6✽30) (15A)
23 2B G02-0894-04 EARTH SPRING (FINAL FET)
24 2A ✽G10-1324-04 FIBROUS SHEET (DISPLAY UNIT)
25 3B G11-4127-14 RUBBER SHEET (CHASSIS)
26 2B G11-4240-04 RUBBER SHEET (DRIVE FET)
27 3B G13-1468-04 CUSHION (CHASSIS)
28 3A G53-1525-03 PACKING (PANEL)
29 2B G53-1542-03 PACKING (PHONE JACK)
30 1B G53-1544-01 PACKING (SHIELDING COVER)
31 1A G53-1548-02 GASKET
33 2C,1D H12-3112-05 PACKING FIXTURE
34 3D H13-1190-02 CARTON BOARD
36 1D H25-2341-04 PROTECTION BAG
37 2D ✽H52-2030-02 ITEM CARTON CASE
39 3C J19-1584-05 MIC HOLDER ACCESSORY
40 3D J29-0662-03 BRACKET ACCESSORY
42 3A ✽K29-9291-01 KEY TOP
43 3A ✽K29-9292-03 KNOB (VOLUME)
44 3A ✽K29-9293-03 KNOB (CNCODER)
A2BN67-2608-46 PAN HEAD SEMS SCREW W
B2AN80-2010-45 PAN HEAD TAPTITE SCREW
C2B,3B N87-2606-46 BRAZIER HEAD TAPTITE SCREW
D1B,2B N87-2614-46 BRAZIER HEAD TAPTITE SCREW
46 3D N99-0395-05 SCREW SET ACCESSORY
48 3A T07-0739-05 SPEAKER
50 2C ✽T91-0641-05 MICROPHONE ACCESSORY
101 2A ✽B11-1809-03 ILLUMINATION GUIDE (LCD)
102 2A ✽B38-0885-05 LCD
D2-4 B30-2205-05 LED (YG)
D19-30 B30-2205-05 LED (YG)
C4 CC73GCH1H101J CHIP C 100PF J
C15,16 CC73GCH1H101J CHIP C 100PF J
C19 CK73GB1H681K CHIP C 680PF K
C22 CK73GB1H102K CHIP C 1000PF K
C24 CK73GB1C104K CHIP C 0.10UF K
C25 CK73GB1H102K CHIP C 1000PF K
C27 CK73GB1H102K CHIP C 1000PF K
C30 CK73GB1C104K CHIP C 0.10UF K
C31-33 CK73GB1H102K CHIP C 1000PF K
C34,35 CK73GB1H472K CHIP C 4700PF K
C36 CK73GB0J105K CHIP C 1.0UF K
C38 CK73GB1H471K CHIP C 470PF K
C39,40 CK73GB1C104K CHIP C 0.10UF K
103 2A ✽E29-1201-04 INTER CONNECTOR (LCD)
CN1 E40-6005-05 FLAT CABLE CONNECTOR
J1 E08-0877-05 MODULAR JACK
104 2A ✽J21-8463-03 HARDWARE FIXTURE (LCD)
L1 L92-0138-05 FERRITE CHIP
CP1 R90-0724-05 MULTI-COMP 1K X4
R8 RK73GB1J102J CHIP R 1.0K J 1/16W
R10 RK73GB1J122J CHIP R 1.2K J 1/16W
R21-23 RK73GB1J103J CHIP R 10K J 1/16W
R25 RK73GB1J563J CHIP R 56K J 1/16W
R26 RK73GB1J392J CHIP R 3.9K J 1/16W
R41 RK73FB2A560J CHIP R 56 J 1/10W
R42 RK73GB1J272J CHIP R 2.7K J 1/16W
R43 RK73GB1J821J CHIP R 820 J 1/16W
R44 RK73GB1J183J CHIP R 18K J 1/16W
R45 RK73GB1J333J CHIP R 33K J 1/16W
R46 RK73GB1J101J CHIP R 100 J 1/16W
R47,48 RK73GB1J473J CHIP R 47K J 1/16W
R49,50 RK73FB2A560J CHIP R 56 J 1/10W
R51-53 R92-1252-05 CHIP R 0 OHM J 1/16W
R55 R92-1252-05 CHIP R 0 OHM J 1/16W
R54 RK73FB2A560J CHIP R 56 J 1/10W
VR1 ✽R31-0646-05 VARIABLE RESISTOR
D31 1SS355 DIODE
IC3 ✽LC75854W MOS IC
IC3 ✽PT6554LQ MOS IC
Q6 KRC102S DIGITAL TRANSISTOR
Q9 2SB1132(Q,R) TRANSISTOR
Q10 KRA225S DIGITAL TRANSISTOR
Q12 UMG3N TRANSISTOR
S1 ✽W02-3665-05 ENCODER
C10 CK73GB1H102K CHIP C 1000PF K
C13-20 CK73GB1H471K CHIP C 470PF K
C28 CK73GB1H221K CHIP C 220PF K
C29 CK73GB1H471K CHIP C 470PF K
C30 CK73GB1H102K CHIP C 1000PF K
C32 CK73GB1H102K CHIP C 1000PF K
C33 CK73GB1H471K CHIP C 470PF K
C34 ✽CE04EQ1E331M ELECTRO 330UF 25WV
C35-38 CK73GB1H471K CHIP C 470PF K
C39,40 CK73GB1C104K CHIP C 0.10UF K
TM-471A
DISPLAY UNIT (X54-3450-10) TX-RX UNIT (X57-686X-XX) 3-00 : C 3-01 : C2