Kenwood TS-990S Service Manual page 58

TS-990S
Ref. No. Use/Function
Q951,952 Switching
Q953,954 Switching
Q955,956 Switching
Q957,958 Switching
Q959,960 Switching
Q961,962 Switching
Q963,964 Switching
Q965,966 Switching
Q967 Switching
Q968 Switching
Q969 Switching
Q970 Switching
Q971,972 Switching
Q973,974 Switching
Q975 Switching
D103,104 Clipper
D105 Surge protection
D106 Mute
D107 Mute
D110~ 112 Surge protection
Reverse current
D113
prevention
D114 Surge protection
Reverse current
D115
prevention
D116 Surge absorption
D117 Surge protection
58
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
Power supply control of sub RX
circuit (ON during sub reception)
Power supply control of sub RX
preamplifi er (ON when sub RX
preamplifi er is ON)
Power supply control of sub RX
preamplifi er (ON when sub RX
preamplifi er is OFF)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 73.095MHz is selected)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 11.374MHz is selected)
Power supply control of TXB
(ON during transmission)
Power supply control of FM circuit
(ON when TX FM mode is se-
lected)
Power supply control of SRXB
(ON during sub reception)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 73.095MHz is selected)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 11.374MHz is selected)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 73.095MHz is selected)
Power supply control of sub RX
1st IF circuit (ON when sub RX
1st IF of 11.374MHz is selected)
Power supply control of 3rd IF cir-
cuit (ON when sub RX SSB, AM
and CW mode are selected)
Power supply control of FM circuit
(ON when RX FM mode is select-
ed)
Power supply control of SRXB
(ON during transmission)
External packet data input
ACC2 connector (7-pin SSQ)
For main ANO mute
For sub ANO mute
ACC2 connector (2/5/9-pin)
Invert PKS control signal
METER connector (3-pin SS-
MET)
Linear amplifi er control signal
Relay (K101)
METER connector (2-pin MS-
MET)
Ref. No. Use/Function
Reverse current
D118
prevention
Reverse current
D119
prevention
D120,121 Surge protection
Reverse current
D171,172
prevention
D200 Surge protection
D201 Surge absorption
D202 Surge absorption
D204,205 Surge absorption
D207 Switching
D208 Switching
Reverse current
D209
prevention
D210 Switching
D211,212 Switching
D213,214 Switching
D215,216 Switching
D217,218 Switching
D219,220 Switching
D221,222 Switching
D223,224 Switching
D225,226 Switching
D227,228 Switching
D229,230 Switching
D231,232 Switching
D233,234 Switching
D235,236 Switching
D237,238 Switching
D239,240 Switching
D251,252 Surge absorption
Operation/Condition/Compatibility
KEY connector (2-pin KEY down/
Electric keyer dot signal)
KEY connector (3-pin KEY down/
Electric keyer dash signal)
ACC2 connector (6/10-pin)
Linear amplifi er control signal
Sub reciever RF signal input
Relay (K201)
Relay (K202)
Internal circuit protection
Sub RX/TX changeover, on dur-
ing sub reception
ON when sub receiveing over
1.705MHz is selected
1/2: Sub receiving ON at
30~522kHz
2/2: Sub receiving ON at
522kHz~1.705MHz
ON when sub receiveing over
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)
ON when sub receiving preampli-
fi er is OFF
ON when sub receiving preampli-
fi er is ON
Internal circuit protection