TK-385
13
DESCRIPTION OF COMPONENTS
IC1,2
IC
Buffer amplifier
IC3
IC
Voltage detector / Reset
IC4
IC
Buffer amplifier
IC5
IC
Voltage regulator / 5M
IC6
IC
Voltage regulator / 5V
IC7
IC
Buffer amplifier
IC8
IC
D/A converter (Adjustment)
IC9
IC
Voltage regulator / 5C
IC10
IC
Active filter / For HSDout
IC11
IC
Active filter / For LSDin
IC12
IC
FM IF system
IC13
IC
Audio processor
IC14
IC
PLL system
IC16
IC
DTMF decoder
IC17
IC
Flash memory
IC18
IC
Active DBM
IC19
IC
Microprocessor
IC20
IC
EEPROM
IC21,22
IC
Shift register / Output expander
IC23
IC
Comparator (APC)
IC24
IC
Analog switch
IC25
IC
Active filter
Q1
Transistor
Switch
Q2
FET
DC switch / 5R
Q3
Transistor
DC switch / 5T
Q4
Transistor
Noise amplifier / Squelch
Q5
FET
DC switch / Save
Q6
Transistor
2
nd
IF W/N switch sets to on when Narrow
DISPLAY UNIT (X54-3210-12)
Q7
Transistor
2
nd
IF W/N switch sets to on when Wide
Q8
Transistor
Ripple filter
Q9
Transistor
DC switch / W/N audio amplitude adjust
Q10
Transistor
AF mute switch
Q11
FET
Mute switch
Q12
Transistor
IF amplifier
Q13
FET
Mute switch / MIC line mute
Q14
FET
DC switch
Q15
FET
DET mute
Q16
Transistor
PLL IC fin amplifier
Q17,18
Transistor
Buffer amplifier
Q19
Transistor
Clock frequency shift
Q20
Transistor
RF amplifier / TX driver
Q21
FET
DC switch
Q22
Transistor
DC switch
Q23
FET
DC switch
Q24
FET
RF amplifier
Q25
Transistor
DC switch
Q26
FET
Mute switch / MIC line mute
D1
Diode
Reverse protection
D2
Diode
Overload protection
D3
Diode
Reverse current protection
D4
Diode
Noise detection
D5
Diode
RF switch (2
nd
IF wide/narrow)
D6
Diode
Current steering
D7
Diode
RF switch (2
nd
IF wide/narrow)
D8
Diode
Voltage clamp
D9
Diode
TX/RX switch
D10
Diode
Overload protection
D11
Diode
Speed up
D12,14,15 Diode
ANT switch
D16
Diode
Overload protection
D17,18
Diode
Surge absorption
D20,22
Diode
Varactor tuning
D23
Diode
Voltage drop
D24,25
Diode
ANT switch
D401
Diode
ANT switch
D402
Diode
Discharge
IC300
IC
Audio power amplifier
IC301
IC
Counter
/Key scan
Q300
FET
DC switch
/ INT MIC on/off
Q301
FET
DC switch
Q302
Transistor
DC switch
/ LED (Red) driver
Q303
Transistor
DC switch
/ LED (Green) driver
Q304
Transistor
DC switch
Q305
Transistor
Current driver
/ Audio amp AVR
Q306
Transistor
DC switch
Q307
Transistor
Current driver
/ LCD back light LED AVR
Q308
FET
DC switch
/ SP INT/EXT
Q309
Transistor
Temperature compensation
Q310
FET
Mute switch
D300
Zener diode Surge absorption
D301
LED
LED
/ Red, Green
D302
Diode
Quick discharge /AF mute
D303
Zener diode Voltage reference
D304
Diode
Voltage reference
D305~310 LED
LCD back light
D315~318 Diode
Reverse current prevention
D319~321 Zener diode Surge absorption
Ref. No. Use/Function
Operation/Condition
Ref. No.
Use/Function
Operation/Condition
TX-RX UNIT (X57-6200-10)
Ref. No.
Use/Function
Operation/Condition
Q50
FET
VCO oscillation
Q51
FET
DC switch
Q52
FET
VCO oscillation
Q53
Transistor
DC switch
Q54
Transistor
RF Buffer amplifier
D50-D57
Diode
Frequency control
D58
Diode
TX modulation
Ref. No.
Use/Function
Operation/Condition
SUB UNIT (X58-4592-71)