TK-90
33
Ref. No.
Use / Function
Operation / Condition
Q9
Switching
TX indication LED switch
Q10
Switching
Busy indication LED switch
Q11~14
Switching
Dimmer control
D1,2
1.8V zener diode
Voltage protection
D3~5
Limiter
Surge prevention
D6
Limiter
Voltage protection
D7
LED
TX/Busy indication
D8~19
LED
LCD backlight
3. TX-RX Unit (X57-7210-20)
Ref. No.
Use / Function
Operation / Condition
IC1
Shift register
Q0: L when BPF4 is selected
Q1: L when BPF5 is selected
Q2: L when BPF6 is selected
Q3: L when BPF3 is selected
Q4: L when BPF1 is selected
Q5: L when BPF7 is selected
Q6: L when BPF8 is selected
Q7: L when BPF2 is selected
Q8: L when FAN1 is selected
Q9: L when FAN2 is selected
Q10: H when ATT is ON
Q11: H when preamplifier is ON
IC101
Mixer
Transmission mixer
IC251
Mixer IC
TX modulator
IC361
OP amplifier
Final current protection
IC362
OP amplifier
Drive current protection
VSWR protection
IC363
A/D
Electrical volume
IC421
Shift register
Q0: TX boost
Q1: FSK select
Q2: NC
Q3: AM control
Q4: OP filter loss
Q5: AGC slow switch
Q6: AGC off switch
Q7: VGS-1 switch
Q8: KPE-2 switch
Q9: IF filter select signal (Option)
Q10: IF filter select signal (2.4k)
Q11: IF filter select signal (6k)
IC422
Analog switch
AGC time constant changeover
COMPONENTS DESCRIPTION /
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