Kenwood TS-990S Service Manual page 46

TS-990S
Ref. No. Use/Function
VCO frequency
D21
control
VCO frequency
D22
control
D23 Switching
Protection of
D24
reverse current
D25 Switching
D26 Switching
D27 Switching
D28 Switching
D29 Switching
D33 Switching
Protection of
D34
reverse current
D37 Switching
D38 Switching
D39 Switching
D40 Switching
D41 Switching
D42 Switching
D43 Switching
D44 Switching
D45 Switching
D46 Switching
D47 Switching
D48 Switching
D49 Doubler
D50 Switching
D51 Switching
D52 Switching
D53 Switching
D54 Switching
D55 Switching
D56 Switching
D57 Voltage shift
PLL (SUB) UNIT (X50-3230-00)
Ref. No. Use/Function
IC1 PLL
IC2 5V AVR
IC3 3.3V AVR
46
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
MLO1 VCO3
MLO1 VCO4
ON when internal REF is selected
PLL (IC17) lock detect
ON when internal REF is selected
ON when VCO3 is operate
ON when VCO4 is operate
ON when 10MHz REF output
ON when source of MLO1 is DDS
ON when source of MLO1 is DDS
PLL (IC18) lock detect
ON when source of MLO1 is DDS
ON when 1/8 divide of VCO oper-
ate
ON when 1/10 divide of VCO
operate
ON when 1/4 divide of VCO oper-
ate
ON when source of MLO1 is DDS
ON when FIL1 of MLO1 operate
ON when FIL2 of MLO1 operate
ON when FIL3 of MLO1 operate
ON when FIL4 of MLO1 operate
ON when FIL5 of MLO1 operate
ON when FIL6 of MLO1 operate
ON when FIL7 of MLO1 operate
Doubler of 20MHz
ON when FIL1 of MLO1 operate
ON when FIL2 of MLO1 operate
ON when FIL3 of MLO1 operate
ON when FIL4 of MLO1 operate
ON when FIL5 of MLO1 operate
ON when FIL6 of MLO1 operate
ON when FIL7 of MLO1 operate
Dorop input voltage of IC5,IC7
Operation/Condition/Compatibility
PLL for 15.6MHz VCXO
SL05C
SL33C
Ref. No. Use/Function
IC5 Shift resistor
IC6 Shift resistor
Level shift of se-
IC7~9
rial data
IC10 PLL
IC11 DDS
IC12 DDS
IC13 1.8V AVR
IC14 DDS
IC15 Wide band AMP
IC16 PLL
IC17 12V AVR
Buffer of serial
IC18
data
IC20 Analog switch
Q1 Buffer
Q2 Amplifi er
Q3 Amplifi er
Q4 Amplifi er
Q5 Amplifi er
Q6 Switching
Q7 Switching
Q8 Ripple fi lter
Operation/Condition/Compatibility
Q1: SLVCO1 "H" when VCO1
operate
Q2: SLVCO2 "H" when VCO2
operate
Q3: SLVCO3 "H" when VCO3
operate
Q4: SLVCO4 "H" when VCO4
operate
Q5: Not used
Q6: Not used
Q7: SLVB "H" when VCO shift
is ON
Q8: TXLO "H" when TX
Q1: Not used
Q2: NFT "L" when FM Mode
Q3: SLIFL "L" when IFB is se-
lected
Q4: SLIFH "L" when IFA is
selected
Q5: SLFIL1 "H" when FIL1 is
selected
Q6: SLFIL2 "H" when FIL2 is
selected
Q7: SLFIL3 "H" when FIL3 is
selected
Q8: SLFIL4 "H" when FIL4 is
selected
3.3V 5V
PLL for DDS (IC14) REF
DDS for PLL (IC16) reference
DDS for SLO3
For DDS (IC14)
DDS for SLO1
Amplifi es DDS (IC14) output
PLL for TLO1 VCO
ML12C
3.3V 3.3V
Loop fi letr shift
PLL (IC1) reference input
Fin AMP of PLL (IC1)
DDS (IC11) master clock input
Reference input of PLL (IC10)
DDS (SLO3) master clock input
ON when VCO1
73.125~79.355MHz operate
OFF when VCO1
79.355~87.755MHz operate
ON when VCO2
87.755~95.105MHz operate
OFF when VCO2
95.105~103.505MHz operate
For TLO1 VCO