Vco; Descriptton Of Components - Kenwood TK-768 Service Manual

Ref No,
PaÉs No.
Use/Function Operation/Condition
4212
DTDI 14EK
o401
2SC4081 (R)
PTT switch 0n when
'PTT
OFF", ofÍ when"PTT ON'. (At using KMC-23/24 only)
0403
DTC363EK
Muting switch
0405
2 S B 1 1 3 2 ( O , R ) Constant current regulator
About 60mA output.
0406
DTAI 14TK
AF switch
0409
DTC144EK
DC switch
o41 1 DTC144EK
o41 I DTA144EK DC switch
0'420 DTC144EK DC switch On/off by noise.
D 1
02cz1B(x,Y)
Voltage reÍerence
D2
DSA3A1-FK Reverse oower orotection 45W model only.
D3 1 SS355 or MA1 1 0
Reverse current protection
D4
02CZ15(X,Y}
Voltage reference
D 5
1 SS355 or MA1 1 0
Reverse current Drotection
D6 ERZ-M1ODK22O
Surge absorption
D 9 - 1 2
DA204K
Surge absorption
D 1 3 02CZ20y,Z)
Voltage reÍerence
T\í / DSM3MAl
Reverse power protection
25W model only.
D17
DAN235K RF switch
D20 MA4PH633 DíRX switch
On when TX.
D22 1 SS355 or MA1 1 0
DC switch
On when power switch ofÍ.
D24 .
Mt809
TX/RX switch On when TX.
D204
DAN235K
Filter switch (PLL BPF)
On when TX.
D205 DAN202K
DC switch
D 2 0 6 , 2 0 7 DA204K
Temoerature comoensation
D208-210
SV269 B P F t u n i n g
Vari-cap tuning.
D211
SV21 4 BPF tuning Vari-cap tuning
D212 SS355 or MA1 10
DC switch On when PLL unlocked.
D 2 1 3
SV21 4 BPF tuning
Vari-cap tuning
D214 DA204K RF detector
Final protection. 45W model only.
D215
02cz12lx,Yl
DC switch
Final protection. 45W model only.
D401,402 DA204K
Surge absorption
D403 DAN2O2U DC switch On when microphone mute on.
D404 DA204K
DC switch
D405 DA204K
Constant current settino
TK:768/H
DESCRIPTION
OF COMPONENTS
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VCO (X58-4360-XX) -10 : M,DM,HDM -11 : M2,DM2,HDM2
Ref No. PaÉs No,
Use/Function
Operation/Condition
o1
U M G l TVRX switching
02
2SK508NV(K52)
Oscillator for RX
o3
2SC421 5Y)
Buffer amplifier
o4
DTCl 14EU TX/RX switching
o5
2SKs08NV(K52)
Oscillator for TX
D 1 - 4 1 sv269
Variable diode Freouencv control.
52
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