Kenwood TS-990S Service Manual page 49

Ref. No. Use/Function
IC300 Shift register
IC320 Shift register
IC340 Shift register
Q12 Switching
Q13 Switching
Q18~ 20 Switching
Q25 Amplifi er
Q26 Amplifi er
Q27,28 Switching
Q31 Switching
Q50 Switching
Q51 Switching
Q52 Switching
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
Q7: CI (7) "H" when antenna
Tuner input side capacitor (150p)
is selected
Q8: CI (8) "H" when antenna
Tuner input side capacitor (300p)
is selected
Q1: CO (1) "H" when antenna
Tuner output side capacitor (2.5p)
is selected
Q2: CO (2) "H" when antenna
Tuner output side capacitor (5p)
is selected
Q3: CO (3) "H" when antenna
Tuner output side capacitor (10p)
is selected
Q4: CO (4) "H" when antenna
Tuner output side capacitor (18p)
is selected
Q5: CO (5) "H" when antenna
Tuner output side capacitor (36p)
is selected
Q6: CO (6) "H" when antenna
Tuner output side capacitor (74p)
is selected
Q7: CO (7) "H" when antenna
Tuner output side capacitor (150p)
is selected
Q8: CO (8) "H" when antenna
Tuner output side capacitor (300p)
is selected
Q1: L1 "H" when antenna tuner
coil (50M) is selected
Q2: L2 "H" when antenna tuner
coil (28M) is selected
Q3: L3 "H" when antenna tuner
coil (24M) is selected
Q4: L4 "H" when antenna tuner
coil (21M) is selected
Q5: L5 "H" when antenna tuner
coil (14M) is selected
Q6: L6 "H" when antenna tuner
coil (10M) is selected
Q7: L7 ""H" when antenna tuner
coil (7M) is selected
Q8: L9 "H" when antenna tuner
coil (3.5M) is selected
MAIN RX circuit protection con-
trol
SUB RX circuit protection control
ON when TX
Amplifi er for Vdet signal
Amplifi er for Idet signal
ON When AT switch ON
ON when RX
ON when RX ANT ON
ON when RX
ON when K14 (for divider control)
is ON
Ref. No. Use/Function
Q53 Switching
Q54 Switching
Q55 Switching
Q56 Switching
Q57 Switching
Q60 Switching
Q61 Switching
Q62 Switching
Q63 Switching
Q64 Switching
Q66 Switching
Q67 Switching
Q300~307 Switching
Q320~327 Switching
Q340~349 Switching
D4 Protection
D9 Protection
Reverse voltage
D10
prevention
Reverse voltage
D11
prevention
D12 Protection
D13 Protection
D14 Protection
D15 Protection
D18 Protection
D19 Switching
D20 Protection
D21 Protection
D22 Protection
D23 Protection
D24 Protection
D33 Protection
D34 Protection
D36 Detection
D37 Detection
D38 Protection
D57 Detection
D58 Detection
D201~208 Protection
D240~247 Protection
TS-990S
Operation/Condition/Compatibility
ON when K15 (for SUB RX signal
control) is ON
RX ANT ON or OFF for MAIN RX
MAIN RX circuit protection con-
trol
RX ANT ON or OFF for SUB RX
SUB RX circuit protection control
RX ANT ON or OFF for MAIN RX
RX ANT ON or OFF for SUB RX
SUB RX circuit protection control
MAIN RX circuit protection con-
trol
ON when K14 (for divider control)
is ON
ON when K15 (for SUB RX signal
control) is ON
ON when RX ANT ON
ON when antenna tuner input
side capacitor is selected
ON when antenna tuner output
side capacitor is selected
ON when antenna tuner coil is
selected
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
For TX signal output
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Surge protection
Current detection
Voltage detection
Surge protection
VSR voltage detection
VSF voltage detection
Surge protection
Surge protection
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