Kenwood TK-190 Service Manual page 22

TK-190
SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS
4. VCO System : L78-0481-05 (TX-RX Unit L800)
4-1. Circuit diagram
C12
L6
2p
10uH
CV2
MOD
GND
CV1
D1
KV1470
L1
10uH
*1 Trimmer capacitor (TC2) decides the oscillation frequency value (oscillation frequency of VC02) of C26 and C27 so that
become 127.5~127.7MHz and set to 1/2 position mechanically.
(The value will be change when these ranges of C26 is within 0~6pF and C27 is within 0~1pF).
Final Unit (X45-3610-10)
Ref. No. Use / Function
Q1 RF power amplifier
Q2 RF power amplifier
Control Unit (X53-3930-10)
Ref. No. Use / Function
IC1 Audio power amplifier
IC2 Shift register
IC3 Microphone amplifier
IC4 Option enable selector
IC5 Option enable selector
IC6 Option enable selector
IC10 Signal logic reversal
IC101 LCD driver
Q5 Audio amplifier power supply
switch
Q6 Audio amplifier power supply
switch
Q7 Internal SP output control
switch
Q8 Audio mute switch
22
VCO2
R12
22k
2SK508NV(K52)
Q3
C15
33p
L7
C19
L34-4620-05
VCO1
2SK508NV(K53)
Q1
C2 C4
27p 39p
L3
C7
1p
L34-4619-05
Operation / Condition
Q1, Q2 Push Pull amplifter
Q1, Q2 Push Pull amplifter
Operation / Condition
0.5W/16Ω, BTL amplifier
Output by AND logic when
key scanned
Output by AND logic when
key scanned
Output by AND logic when
key scanned
Inverter containing
Operate when output audio
signal
Operate when output audio
signal
Operate when output
internal SP
Operate when output SP
and not operate when
mute
C23
8p
Q4
FO2
2p
2SC4649(N,P)
Vcc2
Vcc1
FO1
C10
7p
Q2
2SC4649(N,P)
Ref. No. Use / Function
Q14 Noise cancel circuit switch
Q15 External SP output control
switch
D2 Low voltage control
D12 Commutation
D13 Commutation
D14 Commutation
D15 Commutation
D16 Commutation
D19 Commutation
D20 Commutation
D101 Commutation
D102 LED for LCD light
D103 LED for LCD light
D104 LED fot TX, BUSY turn on
5. Active DBM : GN2011
(TX-RX Unit IC200)
5-1. Circuit diagram
G1
G2
Operation / Condition
Operates when noise
canceled
Operate when output
external SP
Stabilize of audio amplifier
power supply voltage
RED, GREEN
D1
D2
S2
S1