TK-3170/3173
30
Ref. No.
Use / Function
Operation / Condition
Q23
Transistor
AF amplifier DC supply control switch
Q24
FET
AF amplifier DC supply switch
Q25,26
FET
MIC ALC
Q27
Transistor
AF mute control switch
Q28
FET
AF mute switch
Q29
FET
Logic inverter
Q30
FET
MIC mute switch
Q31,32
Transistor
Audio processor clock shift switch
Q33
FET
TX HSD side tone mute
Q34
FET
Ext. alert input ATT switch
Q35
FET
AF mute switch
Q501
Transistor
F-IN amplifier
Q502
FET
TX VCO oscillator
Q503
FET
RX VCO oscillator
Q504
FET
TX/RX VCO DC switch
Q505
Transistor
Ripple filter
Q506
Transistor
RF buffer amplifier
Q507
Transistor
RF amplifier (Common)
Q601
FET
RF amplifier
Q602
FET
Pre-drive amplifier
Q603
FET
TX drive amplifier
Q604
FET
RF final amplifier
Q605
Transistor
APC voltage switch
Q606
FET
APC voltage switch
Q607
Transistor
APC DC switch
Q608
Transistor
APC mute switch
Q609
FET
APC mute switch
Q701
Transistor
2nd local tripler
Q702
Transistor
W/N switch / RX
Q703
Transistor
IF amplifier
Q704
FET
Mixer
Q705
FET
RF amplifier
D1
Diode
5M protect
D2
LED
TX/RX indicator
D4
Diode
Back light current control
D5
LED
LCD back light
D7
LED
LCD back light
D8,9
LED
10 key back light
Ref. No.
Use / Function
Operation / Condition
D12,13
LED
10 key back light
D14~16
Diode
Radio state detector
D17
Diode
RX DET mute control voltage
discharge
D24~27
Diode
Key input detect
D28
Diode
AF reference voltage bias supply
D29
Diode
VOX level detector
D30,31
Diode
MIC input level detector
D32
Diode
VOX amplifier gain limiter
D33
Varistor
Surge absorber
D501
Diode
Fast lock up diode
D502,503
Diode
F-IN filter shift switch
D505
Variable
Frequency control / TX VCO
capacitance diode
D507
Variable
Frequency control / TX VCO
capacitance diode
D509
Variable
Frequency control / RX VCO
capacitance diode
D511
Variable
Frequency control / RX VCO
capacitance diode
D513
Variable
TX VCO modulator
capacitance diode
D514
Diode
Ripple filter stabilization diode
D515
Diode
RX local switch
D516
Diode
TX RF switch
D517
Diode
Fast lock up diode
D601
Zener diode
APC voltage limiter
D604~606
Diode
ANT switch
D608
Diode
ANT switch
D701,702
Diode
Ceramic filter W/N switch
D703~708
Variable
RX BPF tuning
capacitance diode
D901
Diode
Voltage limiter
TH501
Thermistor
TX temperature protect
TH701,702
Thermistor
Temperature compensation for ASQL
F901
Fuse
Fuse : 2.5A/32V/1608 size
(F53-0324-05)
COMPONENTS DESCRIPTION