Kenwood TS-590S, Service Manual

Page: 24 / 162

TS-590S
24
Ref. No. Use / Function Operation / Condition / Compatibility
Q431 Amplifi er
LO2 amplifi er (ON when TX or RX
1st IF of 73.095MHz are selected)
Q451 Amplifi er
RX 2nd IF amplifi er 1
(10.695MHz/ 11.374MHz)
Q453 Switching
Gain correction between bands
(ON when receiving 21.5~30MHz
and PRE ”H” are selected)
Q454 Switching
Gain correction between bands
(ON when receiving 30~60MHz
and PRE “H” are selected)
Q455,456 Switching ON when BLNK signal is “H”
Q471~477 Switching IF fi lter selection
Q521,522 Amplifi er
RX 2nd IF amplifi er 3
(10.695MHz/ 11.374MHz)
Q541 Amplifi er
RX 2nd IF amplifi er 2
(10.695MHz/ 11.374MHz)
Q551 Amplifi er RX 3rd IF amplifi er (24kHz)
Q571 Amplifi er
LO3 amplifi er (ON when RX AM/
SSB/ CW/ FSK mode is selected)
Q591 Switching
Power supply control of FM
circuit (ON when RX FM mode is
selected)
Q631 Switching
Receiver output, FM (AF) and
SSB/ AM/ CW (IF) changeover
multiplexer (IC631) control
Q641 Buffer Noise blanker input buffer
Q651 Amplifi er
Noise blanker IF amplifi er 1
(10.695M/ 11.374MHz)
Q652,653 Amplifi er
Noise blanker IF amplifi er 2
(10.695MHz/ 11.374MHz)
Gain is controlled according to the
NB voltage
Q654 Switching
ON when Noise Blanker IF of
10.695MHz is selected
Q660~662 DC-DC oscillator –6V generation
Q663,664 Amplifi er
Noise blanker IF amplifi er 3
(10.695M/ 11.374MHz)
Gain is controlled according to the
NB voltage
Q665 Switching
ON when Noise blanker IF of
10.695MHz is selected
Q666 Amplifi er
Noise blanker IF amplifi er 4
(10.695M/ 11.374MHz)
Gain is controlled according to the
NB voltage
Q667 Amplifi er
Noise blanker AGC control ampli-
fi er
Q668 Switching
ON when noise blanker IF of
10.695MHz is selected
Q669 Switching Audio mute signal generation
Q670 Buffer Noise Blanker IF buffer
Q671 Switching Audio mute signal generation
Q702 Buffer TX IF buffer (10.695MHz)
Ref. No. Use / Function Operation / Condition / Compatibility
Q721 Amplifi er
TX IF amplifi er (10.695MHz)
Gain is controlled according to the
ALC voltage
Q741 Switching
Transmission IF mute control
(Mute when ON)
Q742 Amplifi er TX IF amplifi er (73.095MHz)
Q781 Switching ON when drive output is selected
Q782 Switching
ON when ANT connector output
is selected
Q783 Amplifi er TX drive output amplifi er
Q784 Switching
Power supply control of TXB to Fi-
nal unit (X45 A/2) (ON when ANT
connector output is selected)
Q801 Switching
ALC protection time constant
changeover switch
Q802 Switching
On in AM mode, makes it an
average value type ALC
Q803~807 Amplifi er ALC amplifi er
Q841 Switching Keying control
Q842 Buffer ALC keying control
Q861,862 Switching
Cancels the time constant for
VSF and VSR voltage lines during
antenna tuning
Q903~905 Switching
Power supply control of TXB
(ON during transmission)
Q906,907 Switching
Power supply control of RXB
(ON during reception)
Q908 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
11.374MHz is selected)
Q909 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
73.095MHz is selected)
Q910 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
11.374MHz is selected)
Q911 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
73.095MHz is selected)
Q915 Switching
Power supply control of FM
circuit (ON when RX FM mode is
selected)
Q916 Switching
Power supply control of 3rd IF
circuit (ON when RX AM/ SSB/
CW/ FSK mode is selected)
Q917,918 Switching
Power supply control of FM
circuit (ON when TX FM mode is
selected)
Q920 Switching
Power supply control of RX circuit
(ON during reception)
Q925 Switching
RX power supply control
(ON during transmission)
D11,12 Clipper External modulation input
COMPONENTS DESCRIPTION