Kenwood TM-V71A Service Manual page 17
144/430 (440) mhz fm dual bander
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Also See for TM-V71A:
- Instruction manual (60 pages) ,
- Instruction manual (107 pages) ,
- Service manual (4 pages)
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Ref. No.
Use / Function
Operation / Condition / Compatibility
Reverse current
D1
A band PLL unlock signal
prevention
D2
Voltage shift
A band charge pump
D3,4
Switching
Speed up switch for ripple fi lter
D5,6
Switching
Speed up switch for Loop fi lter
D10~13
Switching
VHF/UHF BPF select
D14,18
Switching
RF switch (On when A band VHF TX)
D15
Switching
RF switch (On when A band UHF)
D16
Switching
RF switch (On when A band VHF RX)
D17
Switching
RF switch (On when A band UHF RX)
D19
Switching
RF switch (On when A band UHF TX)
D20,21
Switching
VHF BPF shift
D22
Switching
RF switch (On when B band VHF TX)
D23
Switching
RF switch (On when B band UHF)
D24
Switching
RF switch (On when B band VHF RX)
D25
Switching
RF switch (On when B band UHF RX)
D26
Switching
RF switch (On when B band VHF TX)
D27
Switching
RF switch (On when B band UHF TX)
D28
Switching
Line mute (On when B band UHF TX)
D29
Switching
Line mute (On when A band UHF TX)
D30~33
Switching
VHF/UHF BPF select
D34,35
Switching
VHF BPF shift
D66
Switching
B band PLL unlock signal
D67
Voltage shift
B band charge pump
D68,69
Switching
Speed up switch for ripple fi lter
D70,71
Switching
Speed up switch for Loop fi lter
D130
Switching
RF switch (On when A band VHF TX)
D131
Switching
RF switch (On when B band VHF TX)
Temperature
D132
for VHF drive circuit
compensation
D133
5.1V Zener diode
Over voltage prevention
D134,135
Switching
VHF TX RF switch
Temperature
D136
for thermal protection circuit
compensation
D160
Switching
RF switch (On when A band UHF TX)
D161
Switching
RF switch (On when B band UHF TX)
Temperature
D162
for UHF drive circuit
compensation
D163
5.1V Zener diode
Over voltage prevention
D164,165
Switching
UHF TX RF switch
Temperature
D166
for thermal protection circuit
compensation
COMPONENTS DESCRIPTION
TM-V71A/V71E
Ref. No.
Use / Function
Operation / Condition / Compatibility
D186
Switching
RF switch
D187
Switching
RF switch
D188
Switching
RF switch
D189
Switching
RF switch
Reverse current
D190
APC circuit
prevention
D191
Rectifi cation
Forward voltage for APC circuit
D192
Rectifi cation
Reverse voltage for APC circuit
D193
5.1V Zener diode
Over voltage prevention
D226
Switching
IF switch (On when A band VHF RX)
Local signal switch
D227
Switching
(On when A band VHF RX)
D229
Switching
BPF frequency shift
D230,231
Varicap
Tune the A band VHF BPF
D232
Switching
BPF frequency shift
D233,234
Varicap
Tune the A band VHF BPF
D238
Switching
BPF frequency shift
D239,240
Varicap
Tune the A band VHF BPF
D241
Switching
BPF frequency shift
D242,243
Varicap
Tune the A band VHF BPF
D291
Switching
IF switch (On when B band VHF RX)
Local signal switch
D292
Switching
(On when B band VHF RX)
D294
Switching
BPF frequency shift
D295,296
Varicap
Tune the B band VHF BPF
D297
Switching
BPF frequency shift
D298,299
Varicap
Tune the B band VHF BPF
D303
Switching
BPF frequency shift
D304,305
Varicap
Tune the B band VHF BPF
D306
Switching
BPF frequency shift
D307,308
Varicap
Tune the B band VHF BPF
D356
Switching
RF mute
D357,358
Limiter
VHF RF limiter
D361
Switching
IF switch (On when A band UHF RX)
Local signal switch
D362,363
Switching
(On when A band UHF RX)
D364,365
Varicap
Tune the A band UHF BPF
D367,368
Varicap
Tune the A band UHF BPF
D370,371
Varicap
Tune the A band UHF BPF
D375,376
Varicap
Tune the A band UHF BPF
D377~379
Varicap
Tune the A band UHF BPF
D406
Switching
IF switch (on when B band UHF RX)
17
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