At Unit - Kenwood TS-990S Service Manual

TS-990S
Ref. No. Use/Function
VCO frequency
D12
control
VCO frequency
D13
control
VCO frequency
D14
shift
VCO frequency
D15
shift
D16 Switching
D17 Switching
D18 Switching
D19 Doubler
D20,21 Switching
D22 Switching
D23 Switching
D24 Switching
D25 Switching
D26 Switching
D27 Switching
D28~30 Switching
D32 Switching
D33 Switching
D34 Switching
D35 Switching
D36 Switching
D38 Switching
D39 Voltage shift
D40,43 Switching
D44 Switching
D45 Switching
D46 Switching
D47 Switching
D48,49 Switching
D50,51 Switching
D52 Switching
D53 Switching
48
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
TLO1 VCO3
TLO1 VCO4
TLO1 VCO3
TLO1 VCO4
ON when IFA is selected
ON when VCO3 is operate
ON when VCO4 is operate
Doubler of SLO1 DDS output
Diode OR
ON when IFA 30~60M,
16~30M,10~16MHz is selected
ON when IFA 30k~10MHz is
selected
Diode OR
ON when IFB is selected
ON when IFB 7.0~7.3MHz is
selected
ON when IFB 1.8~2.0MHz/
3.5~5.0MHz is selected
Diode OR
ON when IFA 30.0~60.0MHz is
selected
ON when IFA 16.0~30.0MHz is
selected
ON when IFA 10.0~16.0MHz is
selected
ON when IFB 1.8~2.0MHz is
selected
ON when IFB 14.0~21.5MHz is
selected
Diode OR
Dorop input voltage of IC17
ON when IFB 1.8~2.0MHz is
selected
ON when IFA 30.0~60.0MHz is
selected
ON when IFA 16.0~30.0MHz is
selected
ON when IFA 10.0~16.0MHz is
selected
ON when IFA 30k~10MHz is
selected
ON when VCO1 or VCO2 operate
ON when IFA 0.03~16.0MHz is
selected
ON when IFA is selected
ON when IFB 14.0~21.5MHz is
selected
Ref. No. Use/Function
D54 Switching
D55 Switching
D56 Switching
Protection of
D57
reverse current
Protection of
D58
reverse current
Protection of
D59
reverse current
D60 Voltage shift
D63 Voltage shift
AT UNIT (X53-4410-00)
Ref. No. Use/Function
IC2 Amplifi er
IC3 Comparator
IC4 D fl ip-fl op
IC7 Amplifi er
IC8 Shift register
IC300 Shift register
Operation/Condition/Compatibility
ON when IFB 7.0~7.3MHz is
selected
ON when IFB 1.8~2.0MHz/
3.5~5.0MHz is selected
ON one element when IFA is
selected, and ON other element
when IFB is selected
PLL (IC1) lock detect
PLL (IC10) lock detect
PLL (IC16) lock detect
Input voltage shift of IC2, 3
Input voltage shift of IC20
Operation/Condition/Compatibility
Current detection
Ampritude error detection
Phase error detection
Voltage detection
Q1: SRXIO "H" when RXANT
ON and SUB RX are selected
Q2: MRXIO "H" when RXANT
ON and MAIN RX are selected
Q3: DIV1 "H" when different
ANT is selected MAIN RX and
SUB RX
Q4: DIV2 "H" when different
ANT is selected MAIN RX and
SUB RX
Q5: RXANT "H" when RXANT is
selected
Q6: ATS "H" when TX with AT ON
Q7: Reserved
Q8: Reserved
Q1: CI (1) "H" when antenna
tuner input side capacitor (2.5p)
is selected
Q2: CI (2) "H" when antenna
tuner input side capacitor (5p) is
selected
Q3: CI (3) "H" when antenna
Tuner input side capacitor (10p)
is selected
Q4: CI (4) "H" when antenna
Tuner input side capacitor (18p)
is selected
Q5: CI (5) "H" when antenna
Tuner input side capacitor (36p)
is selected
Q6: CI (6) "H" when antenna
Tuner input side capacitor (74p)
is selected