Pll Unit - Kenwood TS-990S Service Manual

TS-990S
Ref. No. Use/Function
Q702 Switch
Q703 Switch
Q803 Power switch
Q804 Switch
Q805 Power switch
Q806 Switch
Q808 Power switch
Q809 Switch
Reverse current
D1
prevention
D402~
Protection
406
D420~
Protection
422
D601~
Protection
604
D701 Protection
Reverse current
D702
prevention
PLL (MAIN) UNIT (X50-3220-00)
Ref. No. Use/Function
IC2 PLL
IC3 DDS
Level Shift of se-
IC4
rial data
IC5 5V AVR
IC6 3.3V AVR
IC7 3.3V AVR
IC8 1.8V AVR
IC9 Wide band AMP
Level shift of se-
IC10,11
rial data
IC12 OP amplifi er
IC13 DDS
IC14 Comparator
IC15 Shift resistor
44
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
USB audio device active signal
switch
USB device power supply control
switch
Power supply control for digital
3.3V
Q803 ON/OFF switch
Power supply control for 3.3V of
USB PHY
Q805 ON/OFF switch
Power supply control for 3.3V of
ADC
Q808 ON/OFF switch
Reduced voltage detection inter-
rupt
Surge protect
Surge protect
Surge protect
Surge protect
For IC708,709 input line
Operation/Condition/Compatibility
PLL for DDS (IC3) REF
DDS for MLO1
3.3V 5V
ML05C
For 19.2MHz TCXO
ML33C
For MLO1 DDS
Amplifi es MLO1 DDS output
3.3V 5V
Control AGC AMP
Internal REF frequency
Detect of 10MHz REF input
Q1: MLVCO1 "H" when VCO1
operate
Q2: MLVCO2 "H" when VCO2
operate
Q3: MLVCO3 "H" when VCO3
operate
Q4: MLVCO4 "H" when VCO4
operate
Q5: MLDI "H" when 1/10 divide
operate
Ref. No. Use/Function
IC15 Shift resistor
IC16 Shift resistor
IC17 PLL
IC18 PLL
IC19 Flip-fl op
IC20 Counter
IC21,22 Flip-fl op
IC23 Buffer
IC24,25 Flip-fl op
IC26 DDS
IC27 12V AVR
Buffer of serial
IC28
data
Q1 Amplifi er
Q2 Ripple fi lter
Q3 Amplifi er
Q4 Oscillate VCO
Q5 Amplifi er
Q6 Amplifi er
Q8 Amplifi er
Q9 Amplifi er
Q10 Amplifi er
Q11 Amplifi er
Q12 Switching
Q13,14 Switching
Q17,18 Switching
Q19 Ripple fi lter
Operation/Condition/Compatibility
Q6: MLDIV2 "H" when 1/4 or
1/8 divide operate
Q7: MLDIV3 "H" when 1/8
divide operate
Q8: MLDDS0
"H" when DDS output used direct
as MLO1
"H" when DDS output used PLL
reference
Q1: MLFIL1 "H" when FIL1
operate
Q2: MLFIL2 "H" when FIL2
operate
Q3: MLFIL3 "H" when FIL3
operate
Q4: MLFIL4 "H" when FIL4
operate
Q5: MLFIL5 "H" when FIL5
operate
Q6: MLFIL6 "H" when FIL6
operate
Q7: MLFIL7 "H" when FIL7
operate
Q8: MDIV2O "H" when 1/4
divide operate
PLL for MLO1 VCO
PLL for 20MHz VCXO
1/2 divide
1/5 divide
1/2 divide
For MLO1 DDS output
1/2 divide
DDS for MLO2
ML12C
3.3V 3.3V
DDS (IC3) master clock input
For DDS REF VCO
Reference input of PLL (IC2)
DDS (IC3) REF VCO
Operate when external 10MHz
REF is selected
DDS REF VCO
Fin AMP of PLL (IC2)
Operate when detect of 10MHz
REF intput enable
DDS (IC13) master clock Input
AGC AMP of 10MHz REF input
ON when source of MLO1 is VCO
Power supply SW of D12
MLO1 PLL loop fi lter
For MLO1 VCO