Description Of Components - Kenwood TK-860G Service Manual

Display Unit (X54-3270-10) : TK-860G
Ref. No. Use/Function
D801 Reverse current
prevention
D802~805 Light emission
D808 Current stability
IC801 LCD driver
Q801 DC switch (LED)
Display Unit (X54-3280-10) : TK-862G
Ref. No. Use/Function
D801 Light emission
D802 Reverse current
prevention
D803,804 Light emission
IC801 LCD driver
Q801~809 DC switch (LED)
TX-RX Unit (X57-5960-XX)
-10 : TK-860G K,M -11 : TK-862G K -14 : TK-860G K3
Ref. No. Use/Function
D1 Surge absorption
D2 Voltage reference
D3~5 Surge absorption
D8 IF switch (Wide/Narrow)
D9 DC switch
D10 IF switch (Wide/Narrow)
D11 Noise amp detect
D14 Surge absorption
D15 OR gate
D16 RF switch (TX/RX)
D17 Temperature
compensation
D18 RF BPF tuning
D19 Surge absorption
D20 Reverse current
prevention
D21 Voltage reference
D23 RF BPF tuning
D24 Voltage reference
D25 Surge absorption
D27 Reverse current
prevention

DESCRIPTION OF COMPONENTS

Operation/Condition
Operation/Condition
Operation/Condition
SP mute, AM
Heterodyne
Drive
TK-860G/862G
Ref. No. Use/Function
D28 RF BPF tuning
D29 Reverse current
prevention
D30 ANT switch
D31 RF BPF tuning
D33,34 ANT switch
D35,36 APC voltage detect
D39 Voltage reference
D40 Charge
D41 Temperature
compensation
D42 Voltage drop
D43 Surge absorption
D501 Reverse current
prevention
D502 Reverse current
prevention
D503 Reverse current
prevention
D504 Reverse current
prevention
D505 Reverse current
prevention
D506 Voltage discharger
D507 Reverse current
prevention
D508 Limiter
D509~514 Key backlight
D521 Busy/TX LED
D523 OR gate
D524 Surge absorption
D525 Surge absorption
D526 Current protection
D527 Surge absorption
D528 Surge absorption
D529 Limiter
IC1 Sum amplifier
IC2 DC amplifier
IC3 PLL synthesizer
IC4 Amplifier
IC5 AF demodulation
IC6 D/A converter
Operation/Condition
Power protection
DEO
APC
Charge pump
KOUT 0
KOUT 1
KOUT 2
KOUT 0
KOUT 1
When powering down
KOUT 2
MIC
Active while MBL is H
Lights green while busy,
red while TX
MIC mute, MM, MM2
HOOK/RXD
PTT/TXD
CM
MBL
QT/DQT decode limiter
DI, TO mixing
FC, TCXO control
Reference 16.8MHz,
PLL lock : LD H
DEO
Quadrature detector, 2nd mixer,
OSC, IF amplifiler, RSSI
31