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Kenwood TH-D74E Service Manual page 17

144/430mhz dual bander
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Ref. No.
Use / Function Operation/Condition/Compatibility
Q12
APC
Q13
DC SW
Q14
DC SW
Q171
RF AMP
Q172
RF AMP
Q173
SW
Q174
SW
Q175
SW
Q176
SW
Q177
SW
Q178
RF AMP
Q179
RF AMP
Q180
SW
Q181
SW
Q182
SW
Q183
SW
Q184
SW
Q185
SW
Q186~189 SW
Q190,191
RF AMP
Q192
RF AMP
Q193
RF AMP
Q194
SW
Q195
RF AMP
Q196
SW
Q197
SW
Q281
1st Mixer
Q282
IF AMP
Q283
DC SW
Q361
RF AMP
Q362
SW
Q363
RF AMP
Q364
RF AMP
Q365
RF AMP
Q368,369
Oscillator
Q371
SW
Q372
SW
Q373,374
SW
Q375
RIPPLE FILTER VCO B-band
Q376
RF AMP
Q377
SW
Q378
RF AMP
Q379
SW
Q380
RF AMP
Q381
RF AMP
Q382
RF AMP
AMP
VHF TX
ATT
UHF RX A-band
UHF RX
UHF RX
UHF RX A-band
UHF RX B-band
VHF RX
220M RX
VHF/220M RX A-band
VHF RX
VHF/220M RX
VHF RX A-band
VHF RX B-band
MW bar antenna
HF RX
SW bar antenna
ANT switch
HF RX B-band
UHF RX B-band
VHF/220M RX B-band
UHF RX
FM Radio
HF/FM radio
FM Radio
A-band
A-band
Current switch
TX AMP
Fin switch
Local B-band
Fin B-band
Local B-band
VCO2 B-band
VCO2 B-band
VCO1 B-band
VCO Shift B-band
Local AMP A-band
Local AMP A-band
TRIPLER
DOUBLER A-band
DOUBLER A-band
Buffer
TRIPLER
Ref. No.
Use / Function Operation/Condition/Compatibility
Q383
RF AMP
Q384
RF AMP
Q385
RIPPLE FILTER VCO A-band
Q386
Oscillator
Q387
SW
Q388
DC SW
Q389
RF AMP
Q390
DC SW
Q391
SW
Q576
DC SW
Q577
DC SW
Q579
SW
Q580
SW
Q581
SW
Q582
DC SW
Q584,585
Inverter
Q661
SW
Q675
RF AMP
Q700
SW
Q701
Level shift
Q702
SW
Q703
SW
Q704
SW
Q706
SW
Q707
SW
Q711
SW
Q712
SW
Q881,883,
SW
885
Q884
SW
Q886
SW
Q930
SW
D2,3
RF SW
D4,5
RF SW
D8,9
RF SW
D10
Detector
D11,12
RF SW
D13,14
RF SW
D17
Detector
D18,19
RF SW
D20
Reverse current
protector
D22,26
RF SW
D27
SW
D28
SW
Buffer
Fin A-band
VCO A-band
VCO Shift A-band
33TX on/off
Buffer
Local B-band
Loop Filter B-band
UHF TX
VHF TX
DC IN
Switching FET for 8.4V DC/DC
with Battery Charger
Battery
1st Mixer A-band
Power ON Logic for DC IN or
Battery Insert
Beet Shift
RX signal
Beat shift
+B -> 3.3V
33AD
LCD reset
MOD AMP on/off
18M DC/DC on/off
Bus switch on/off
TX/busy LEDs on/off
VBUS on/off
SP mute
MIC AMP on/off
47C on/off
TCXO(GPS) on/off
UHF RX
VHF RX
ATT
TX protector
ATT
VHF TX
TX protector
UHF TX
VHF TX
VHF TX
UHF TX
(No.RA044<Rev.001>)1-17

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