Filter
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TH-K2AT/K2E/K2ET
15
98 DCDET I
DC IN detection interrupt input (
↓
)
L:DC IN connected
99 RXLED O Busy LED output H:ON
100 BSFT O Beat shift swiching output H:ON
101 PLLEN O Serial enable output to PLL IC
102 PLLLD I
Lock detection input from PLL IC H: Lock
103 KIN0 I Key matrix input 0
104 KIN1 I Key matrix input 1
105 KIN2 I Key matrix input 2
106 KIN3 I Key matrix input 3
107 KIN4 I Key matrix input 4
108 TYPE I Market code bit input
109 VUKEY I Detection of 4 key or 16 key
110 MICM O Microphone mute switch H:Mute
111 NOAA I 1050Hz tone detection input
112 5R O RX power supply switch L:ON
113 SHIFT O VCO shift switch L:TX, H:RX
114 5T O TX power supply switch L:ON
115 KOUT0 O Key matrix output 0
116 KOUT1 O Key matrix output 1
117 KOUT2 O Key matrix output 2
118 KOUT3 O Key matrix output 3
119 VSS - GND
120 BTDET O Battery detection switch L:ON
SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION
Pin Pin
I/O Function
No. Name
IC1 PLL IC
IC2
APC differential
amplifier
IC3 FM IC
IC4 11.5V AVR
IC5 HPF Active filter
IC6 AF amplifier
IC8 MPU
IC9 5.0V AVR
IC10
4.4V voltage
MPU INT voltage detection
detection
IC11
3.3V voltage
MPU Reset voltage detection
detection
IC12 5.0V AVR
IC15 EEPROM
IC16
MIC amplifier
Limiter, splatter filter
IC17
CTCSS/DCS/WX
Active filter
filter
Q1 VCO
Q2 RF amplifier
Q3
VCO shift
On RX
control switch
Q4 Ripple filter
Q5,6,9 RF amplifier
Q10,11
Drive amplifier
Q12
Power amplifier
Q13
APC circuit
On TX
operation switch
Q14
APC output
On TX
switch
Q15
Q10 operation
On TX
switch
Q16 1st mixer
Q17
RX 1st amplifier
Q20
Audio mute
Audio mute when off
switch
Q21 Audio filter Active filter
Q22
Wide/narrow
On when wide is selected
changeover switch
Q23 Tripler 2nd local
Q24 IF amplifier 1st IF 38.85MHz
Q27
Wide/narrow
On when wide is selected
changeover switch
Q29
MIC mute
Mutes when ON
switch
Q30
VOX detection
amplifier
Q31
Q56 operation
Off when the speaker outputs audio
switch
Q33
Charge switch
Ref. No.
Use/Function
Operation/Condition/Compatibility
TX-RX UNIT (X57-674X-XX)
COMPONENTS DESCRIPTION