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TM SERV © 2007-5 PRINTED IN JAPAN B51-8791-00 (N) 289
Microhone (T91-0657-15)
Panel (Display) (A62-1135-03) Metallic cabinet (A01-2206-02)
Knob (ENC) (K29-9376-03) Button knob (VFO,MR) (K29-9378-03)
Button knob (7KEYS) (K29-9381-02)
Front glass (Display) (B10-2775-12)
Knob (VOL) (K29-9377-03) x 2 Knob (SQL) (K29-9380-03) x 2
Button knob (POWER,PM) (K29-9379-03)
Photo is TM-V71A.
CONTENTS DISASSEMBLY FOR REPAIR ......................2 CIRCUIT DESCRIPTION ..............................3 SEMICONDUCTOR DATA .........................11 COMPONENTS DESCRIPTION.................14 TERMINAL FUNCTION .............................19 PARTS LIST ...............................................22 EXPLODED VIEW ......................................38 PACKING....................................................39 ADJUSTMENT ..........................................40
This product complies with the RoHS directive for the European market.
PC BOARD DISPLAY UNIT (X54-3590-00) ...............60 TX-RX UNIT (X57-731X-XX) .................64 INTERCONNECTION DIAGRAM ..............72 SCHEMATIC DIAGRAM ............................74 BLOCK DIAGRAM .....................................86 LEVEL DIAGRAM ......................................88 OPTIONAL ACCESSORIES .......................90 SPECIFICATIONS ......................................91
This product uses Lead Free solder.
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TM-V71A/V71E CIRCUIT DESCRIPTION 2-2. Band B VHF Receiver Circuit
2. Receiver System 2-1. Band A VHF Receiver Circuit The incoming signal from the antenna passes through a filter circuit and goes to the RF amplifier (Q228). The amplified signal enters the band-pass filter. After the signal passes through the band-pass filter, it is amplified by another RF amplifier (Q227) and then passes through the bandpass filter before entering the mixer (Q226). The frequency of the signal is converted by the first local oscillator (Upper heterodyne) to generate a 45.05MHz first IF signal. The signal passes through the MCF (XF486), is amplified by the IF amplifier (Q495) and then enters the FM IC (IC486). The signal is converted to the 455kHz second IF signal by the second local oscillator (Upper heterodyne). It is then detected to generate an audio signal.
LPF
D134,135 D186,188
BPF RF AMP D241~243 Q228 L248,249,258
The incoming signal from the antenna passes through a filter circuit and goes to the RF amplifier (Q293). The amplified signal passes through the band-pass filter and is amplified by another RF amplifier (Q292). It then passes through the band-pass filter and goes to the mixer (Q291). The frequency of the signal is converted by the first local oscillator (Upper heterodyne) to generate a 49.95MHz first IF signal. The signal passes through the MCF (XF546), is amplified by the IF amplifier (Q551) and then enters the FM IC (IC546). The signal is then converted to the 450kHz second IF signal by the second local oscillator, which is tripled 16.8MHz (Upper heterodyne). It is then detected to generate an audio signal.
BPF BPF BPF D238~240 RF AMP D232~234 D229~231 MIXER L245,257 Q227 L232,236,250 L232,233,260 Q226
MCF XF486
X486 45.505MHz 2nd Local OSC
IF AMP Q495
ANT SW
FM IC IC486
Band A AF
45.05MHz
Band A
CF Narrow
SW BPF D306~308 L312~314
BPF BPF BPF D303~305 RF AMP D297~299 D294~296 MIXER L309,310,322 Q292 L301,302,323 L297,298,324 Q291
MCF XF546
16.8MHz
Q547
TCXO X66
Tripler x3
IF AMP Q551
2nd Local OSC
ua
RF AMP Q293
D/A IC576
om
IC576 Q229
MPU IC918
l.c
AIP SW
CF Wide
1st Local OSC
IC667
D/A
IC918
IC577
Band B
ic ere
IC576 Q294
MPU
pa
1st Local OSC
SW
CF Narrow
Band A and Band B VHF receiver circuit
se
Fig. 2
CF Wide
rv
AIP SW
irm
49.95MHz IC667
Band B AF
an
FM IC IC546
4
2-3. Band A UHF Receiver Circuit
2-4. Band B UHF Receiver Circuit
The incoming signal from the antenna passes through a filter circuit and goes to the RF amplifier (Q363). The amplified signal enters the band-pass filter. After the signal passes through the band-pass filter, it is amplified by another RF amplifier (Q362) and then passes through the band-pass filter before entering the mixer (Q361). The frequency of the signal is converted by the first local oscillator (Lower heterodyne) to generate a 45.05MHz first IF signal. The signal passes through the MCF (XF486), is amplified by the IF amplifier (Q495) and then enters the FM IC (IC486). The signal is converted to the 455kHz second IF signal by the second local oscillator (Upper heterodyne). It is then detected to generate an audio signal.
The incoming signal from the antenna passes through a filter circuit and goes to the RF amplifier (Q408). The amplified signal passes through the band-pass filter and is amplified by another RF amplifier (Q407). It then passes through the band-pass filter and goes to the mixer (Q406). The frequency of the signal is converted by the first local oscillator (Lower heterodyne) to generate a 49.95MHz first IF signal. The signal passes through the MCF (XF546), is amplified by the IF amplifier (Q551) and then enters the FM IC (IC546). The signal is then converted to the 450kHz second IF signal by the second local oscillator, which is tripled 16.8MHz (Upper heterodyne). It is then detected to generate an audio signal. The VHF/ UHF band-pass filter is tuned to the desired frequency according to the BPF voltage output from the D/A IC (IC667), and is controlled by the MPU (IC918) and the varicap.
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J
K
L
M
N
O
P
Q
R
S
TM-V71A/V71E
PC BOARD
1
2
DISPLAY UNIT (X54-3590-00) (A/3, B/3, C/3) Component side view (J79-0140-09)
3
D926
D954
D953
D952
D974
D973
D949
D939
D929
D972
D971
D970
4
D931
D936
D975
D979
R933
D946
R938
D964
S911 POWER
R939
D965
R936
R932
D966
R924
ED903
S912 PM
D948
D928
D938
CP907
D922
D932
CP906
D942
R937
R925
5
Band A
6
l.c ua
D941
7
pa
irm
S910 PF2
8
re
5 SQL_A
e-
VOL_A 4
ic
KEY11
rv
SW5V 2 1 GND
se
CN902
9
C952
C917
D914
VR901
10
J79-0140-09 B/3
11
5 SQL_B VOL_B 4 KEY12 SW5V 2 1 GND CN904
12
D917 C920
S909 PF1
an
R943 S908 LOW
VR902
C955
D980
D951
R942
D981
D984
56
D987
om
Band B
13
J79-0140-09 C/3
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