Kenwood TS-990S Service Manual page 56

TS-990S
Ref. No. Use/Function
IC54 Shift register
IC55 D/A convertor
IC101 OP amplifi er
IC481 OP amplifi er
IC601 OP amplifi er
IC602 Sub RX FM IC
IC603 OP amplifi er
IC604 Multiplexer
IC701 TX mixer
IC702 TX mixer
IC801~803 OP amplifi er
IC804 OP amplifi er
Q102 Switching
Q103 Mute
Q104 Buffer
Q105 Mute
Q106 Buffer
Q107 Switching
Q108 Buffer
Q109 Switching
56
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
Q7: LINEAR "H" when con-
trolled linear relay is selected
Q8: TCS "L" when during AT
tuning
Ao1: Reserved
Ao2: SIFGC Sub RX IF gain
control voltage
Ao3: ALCREF ALC reference
voltage
Ao4: TGC TX band gain control
voltage
Ao5: POC TX power control
voltage
Ao6: PGC TX power gain con-
trol voltage
Ao7: PRO SWR protection
control voltage
Ao8: SNBL/IDP Sub NB level
control voltage on during sub
reception
Final circuit current protection on
during transmission
A/2: Sub RX S-meter voltage
amplifi er
B/2: Main RX S-meter voltage
amplifi er
A/2: No used
B/2: SAGCV voltage amplifi er
A/2: Sub RX 3rd IF amplifi er
B/2: No used
Sub RX FM demodulator
A/2: Sub RX FM noise squelch
voltage amplifi er
B/2: Sub RX FM AF signal ampli-
fi er
Sub receiver output, FM (AF) and
SSB/AM/CW (IF) changeover
Transmission mixer
(24kHz>10.695MHz)
Transmission mixer
(73.095MHz>HF)
ALC protection
Amplifi er for meter
External sub squelch output
signal (open collector)
For main ANO mute
Buffer amplifi er for main ANO
output
For sub ANO mute
Buffer amplifi er for sub ANO
output
External main squelch output
signal (open collector)
Buffer amplifi er for PKS input
signal
ON when relay for HF band linear
is used
Ref. No. Use/Function
Q110 Switching
Q111 Switching
Q171,172 Switching
Q201 Switching
Q202 Switching
Q203 Sub RX Mute
Q204,205 Switching
Q206 Switching
Q207 Switching
Q208 Switching
Q209 Switching
Q210 Switching
Q211 Switching
Q212 Switching
Q213 Switching
Q214 Switching
Q215 Switching
Q216 Switching
Q217 Switching
Q218 Switching
Q219 Amplifi er
Q220 Switching
Q351~354 Sub RX 1st mixer
Q355,356 Amplifi er
Operation/Condition/Compatibility
ON when relay for HF band linear
is transmission
ON when relay for HF band linear
is used
ON when relay for HF band linear
is used
Sub RX 6dBATT changeover
relay (K201) control (OFF when
sub RX 6dB and 18dB ATT are
ON)
Sub RX 12dBATT changeover
relay (K202) control (OFF when
sub RX 12dB and 18dB ATT are
ON)
Mutes reception path during
transmission (ON during trans-
mission)
ON when BPF of
30kHz~1.705MHz is selected
ON when BPF of
522kHz~1.705MHz is selected
ON when BPF of 30~522kHz is
selected
ON when BPF of 1.705~2.5MHz
is selected
ON when BPF of 2.5~4.1MHz is
selected
ON when BPF of 4.1~6.9MHz is
selected
ON when BPF of 6.9~7.5MHz is
selected
ON when BPF of 7.5~10.5MHz is
selected
ON when BPF of 10.5~13.9MHz
is selected
ON when BPF of 13.9~14.5MHz
is selected
ON when BPF of 14.5~21.5MHz
is selected
ON when BPF of 21.5~30MHz is
selected
ON when BPF of 30~60MHz is
selected
ON when BPF of 49~54MHz is
selected (TX only)
Sub RX preamplifi er (~21.5MHz:
12dB, 21.5~60MHz: 20dB)
Sub RX preamplifi er gain control
(ON sub receiving at
21.5~60MHz)
Sub receiving 1st mixer
(HF>11.374MHz)
Sub RX SLO1 amplifi er (Sub RX
1st IF of 11.374MHz is selected)