Kenwood TS-590SG, Service Manual

Page: 23 / 155

TS-590SG
23
Ref. No. Use / Function Operation / Condition / Compatibility
IC13 D/A convertor
Ao7: PRO
SWR protection control voltage
Ao8: NBL
NB level control voltage
IC14 Shift register
Q1: BPF[5] “H” when BPF of 5M
band is selected
Q2: BPF[4] “H” when BPF of
3.5M band is selected
Q3: BPF[3] “H” when BPF of
1.8M band is selected
Q4: BPF[2] “H” when BPF of
BC band (522k~1.705MHz) is
selected
Q5: BPF[1] “H” when BPF of BC
band (30~522kHz) is selected
Q6: ATT “L” when attenuator is
ON
Q7: RXANT “H” when receiving
under 30MHz and external RX
antenna is ON
Q8: PRE “H” when receiving
preamplifi er is ON
IC15 Shift register
Q1: BPF[13] “H” when BPF of
50M band is selected
Q2: BPF[12] “H” when BPF of
30~60M band is selected
Q3: BPF[11] “H” when BPF of
28M band is selected
Q4: BPF[10] “H” when BPF of
21M band is selected
Q5: BPF[9] “H” when BPF of
14M band is selected
Q6: BPF[8] “H” when BPF of
11M band is selected
Q7: BPF[7] “H” when BPF of
10M band is selected
Q8: BPF[6] “H” when BPF of 7M
band is selected
IC521 OP amplifi er
A/2: AGC Voltage and AGC refer-
ence voltage amplifi er
B/2: Not used
IC591 RX FM IC RX FM Detection
IC592 OP amplifi er
A/2: RX FM Noise squelch volt-
age amplifi er
B/2: RX FM AF signal amplifi er
IC601 OP amplifi er RX 3rd IF amplifi er 2 (24kHz)
IC631 Multiplexer
Receiver output, FM (AF) and SSB/
AM/ CW/ FSK (IF) changeover
IC701 TX Mixer
Transmission mixer
(24kHz
→
10.695MHz)
IC761 TX Mixer
Transmission mixer
(73.095MHz
→
HF)
IC801 OP amplifi er ALC protection
IC802 OP amplifi er ALC protection
IC803 OP amplifi er ALC protection
IC861 OP amplifi er Amplifi er for meter
Q12 Buffer Buffer amplifi er for ANO output
Q13 Switching
External squelch output
(open collector)
Ref. No. Use / Function Operation / Condition / Compatibility
Q14 Buffer Buffer amplifi er for PKS input signal
Q15 Switching
ON when relay for HF band linear
is used
Q16 Switching
ON when relay for HF band linear
is transmission
Q17 Switching
ON when relay for HF band linear
is used
Q18,19 Switching
ON when relay for HF band linear
is used
Q101 Switching
Dedicated external RX antenna
changeover relay (K101) control
(ON when external RX antenna is
selected)
Q102 Switching
ATT changeover relay (K102)
control (OFF when ATT is ON)
Q103 Mute
Mutes reception path during
transmission
(ON during transmission)
Q131~143 Switching RF BPF selection
Q200 Switching
RX Antenna output changeover
relay (K103) control
(OFF when ANTOUT is ON)
Q236 Amplifi er
Preamplifi er (HF~21.5MHz: 12dB,
21.5~60MHz: 20dB)
Q239 Switching
Preamplifi er gain control
(ON receiving at 21.5~60MHz)
Q263~266 RX mixer
Receiving 1st mixer
(HF
→
11.374MHz)
Q267 Switching
Power supply control of preampli-
fi er (ON when preamplifi er is ON)
Q268 Switching
Power supply control of preampli-
fi er (ON when preamplifi er is OFF)
Q269 Switching
Power supply control of preampli-
fi er (ON when preamplifi er is ON)
Q270 Switching
Power supply control of preampli-
fi er (ON when preamplifi er is OFF)
Q271 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
73.095MHz is selected)
Q272 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
11.374MHz is selected)
Q273 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
73.095MHz is selected)
Q274 Switching
Power supply control of RX 1st
IF circuit (ON when RX 1st IF of
11.374MHz is selected)
Q281,282 Amplifi er
RX LO1 amplifi er (RX 1st IF of
11.374MHz is selected)
Q301 Switching
ON when RX 1st IF of 11.374MHz
(NB1 function ON) is selected
Q302,303 Switching
ON when RX 1st IF of 11.374MHz
(NB1 function OFF) is selected
Q305 Switching
ON when RX 1st IF of 11.374MHz
(NB1 function ON) is selected
COMPONENTS DESCRIPTION