Description Of Components - Kenwood TK-390 Service Manual

TX-RX Unit (X57-5400-10)
Ref. No. Use / Function
IC2 Level shift
IC3 D/A converter (adjustment)
IC4 DC-DC converter
IC5 Phase locked loop system
IC6 Level shift
IC7 APC comparator
IC10 VCO system
IC200 Active DBM
IC300 FM IF system
IC301 Audio mute switch
IC400 Shift register
IC401 Voltage regulator
IC402 Voltage regulator
IC403~405 Shift register
IC406 Microprocessor
IC407 Voltage detector
IC408 Address decoder
IC409 Voltage detector
IC410 Address decoder
IC411 Address decoder
IC412 EEPROM
IC413 Active filter
IC600 DTMF decoder
IC601 Buffer amplifier
IC602 Active filter
IC603 D/A converter (Adjustment)
IC604 Summing amplifier/
Buffer amplifier
IC605 Active filter/
Summing amplifier
IC606 Active filter
IC607 Audio processor
Q2 DC convert switch
Q3 RF amplifier
Q4 Ripple filter
Q5 Buffer amplifier
Q6 RF amplifier
Q7 DC switch
Q8 RF amplifier
Q9 DC switch
Q10 DC switch
Q13 DC switch

DESCRIPTION OF COMPONENTS

Operation / Condition
Outputs ± twice the
input voltage 5M
2nd mixer, Quadrature
detector, AF output,
Noise amplifier output,
S-meter output
Output expander
5CM
5M
Output expander
16 bit +1M flash
INTPO
AND gate
Reset
OR gate
NOR gate
For HSD output
LPF for LSD input
AF/TO
SQL : HPF, MOD
: Summing amplifier
LPF for 2 tone
Buffer for RF input
4C
TX drive
APC circuit power
switch
TX drive
APC voltage control
APC off : Speed up
D/A port protection
Ref. No. Use / Function
Q200 RF amplifier
Q201 RF amplifier
Q300 DC switch
Q301 DC switch
Q302 IF amplifier
Q303 DC switch
Q304 DC switch
Q305 DC switch
Q307 DC switch
Q400 DC switch
Q401 DC switch
Q402 DC switch
Q403 DC switch
Q404 DC switch
Q405 DC switch
Q406 DC switch
Q407 Clock frequency shift
Q408 DC switch
Q409 DC switch
Q410 DC switch
Q411 Current driver
Q600 DC switch
Q601 Mute switch
Q602 DC switch
Q603 DC switch
D4 Noise rejection
D6 Current steering
D7 TX/RX switch
D8 Temperature compensation
D9 Voltage protection
D10,11 ANT switch
D200 Overload protection
D201,202 Varactor tuning
D203,204 Varactor tuning
D300,301 RF switch
D302,303 RF switch
D400 Reverse protection
D401 Overload protection
D402,403 Surge absorption
D409 Voltage reference
D601 Voltage clamp
TK-390
Operation / Condition
RX front 1st amplifier
RX front 2nd amplifier
1st IF W/N switch sets
to on when Narrow
1st IF W/N switch sets
to on when Wide
Post amplifier
2nd IF W/N switch sets
to on when Narrow
2nd IF W/N switch sets
to on when Wide
5TC "H" : on
5CC "H" : on,
5TC "H" : on
Regulator 5T, 5C
MIC mute
MIC switch
5CC "H" : on
5R
TX LED (Red) driver
Busy LED (Green) driver
Lamp
Lamp : Backlight
Clip
MIC line mute
SQL : W/N adjustment
For L205
For L210
1st IF wide/narrow
2nd IF wide/narrow
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