Components Description - Kenwood TK-2170ST Service Manual

TK-2170/2170ST
Ref. No. Use / Function
Q23 Transistor
Q24 FET
Q25,26 FET
Q27 Transistor
Q28 FET
Q29 FET
Q30 FET
Q31,32 Transistor
Q33 FET
Q34 FET
Q35 FET
Q501 Transistor
Q502 FET
Q503 FET
Q504 FET
Q505 Transistor
Q506 Transistor
Q507 Transistor
Q602 FET
Q603 FET
Q604 FET
Q605 Transistor
Q607 Transistor
Q608 Transistor
Q609 FET
Q701 Transistor
Q702 Transistor
Q703 Transistor
Q704 FET
Q705 FET
D1 Diode
D2 LED
D4 Diode
D5 LED
D7 LED
D8,9 LED
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COMPONENTS DESCRIPTION

Operation / Condition
AF amplifier DC supply control switch
AF amplifier DC supply switch
MIC ALC
AF mute control switch
AF mute switch
Logic inverter
MIC mute switch
Audio processor clock shift switch
TX HSD side tone mute
Ext. alert input ATT switch
AF mute switch
F-IN doubler
TX VCO oscillator
RX VCO oscillator
TX/RX VCO DC switch
Ripple filter
RF buffer amplifier
RF amplifier (Common)
Pre-drive amplifier
TX drive amplifier
RF final amplifier
APC voltage switch
APC DC switch
APC mute switch
APC mute switch
2nd local tripler
W/N switch / RX
IF amplifier
Mixer
RF amplifier
5M protect
TX/RX indicator
Back light current control
LCD back light
LCD back light
10 key back light
Ref. No. Use / Function
D12,13 LED
D14,16 Diode
D17 Diode
D24~27 Diode
D28 Diode
D29 Diode
D30,31 Diode
D32 Diode
D33 Varistor
D501 Diode
D502,503 Diode
D504~507 Variable
capacitance diode
D508~511 Variable
capacitance diode
D512 Diode
D513 Variable
capacitance diode
D514 Diode
D516 Diode
D519 Diode
D601 Zener diode
D604~606 Diode
D608 Diode
D609 Zener diode
D610 Varistor
D701,702 Diode
D703~706 Variable
capacitance diode
D901 Diode
TH501 Thermistor
TH701,702 Thermistor
F901 Fuse
Operation / Condition
10 key back light
Radio state detector
RX DET mute control voltage
discharge
Key input detect
AF reference voltage bias supply
VOX level detector
MIC input level detector
VOX amplifier gain limiter
Surge absorber
Fast lock up diode
F-IN filter shift switch
Frequency control / TX VCO
Frequency control / RX VCO
F-IN filter shift switch
TX VCO modulator
Ripple filter stabilization diode
TX RF switch
RX local switch
APC voltage limiter
ANT switch
ANT switch
Surge absorber
Surge absorber
Ceramic filter W/N switch
RX BPF tuning
Voltage limiter
TX temperature protect
Temperature compensation for ASQL
Fuse : 2.5A/32V/1608 size
(F53-0324-05)