Digital Unit - Kenwood TS-990S Service Manual

Ref. No. Use/Function
Q19 Switching
Q20 Switching
Q21 Switching
Q22 Switching
Q23 Switching
Q24 Switching
Q25 Switching
Q26 Switching
Q27 Switching
Q500 Switching
Q502 Switching
Q800 Switching
Q801 Switching
Q802 Switching
Q803 Switching
Q804 Switching
Q805 Switching
Q806 Switching
Q807 Switching
Reverse voltage
D1
prevention
D2 Detection
D3 Detection
Reverse voltage
D5
prevention
D8 Protection Surge protect
D9~17 Protection Surge protect
D50 Attenuator RF power control
D51 Protection Surge protect
Reverse voltage
D501 Surge protect
prevention
D800~808 Protection
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
ON when 1.705~2.1MHz band
LPF is selected
ON when 21.5~30.0MHz band
LPF is selected
ON when 14.5~21.5MHz band
LPF is selected
ON when 7.5~10.5MHz LPF is
selected
ON when 4.0~5.5MHz LPF is
selected
ON when AT fan rotates at low
speed
ON when AT fan rotates at low
speed
ON when AT fan rotates at high
speed
ON when AT fan rotates at high
speed
ON when operates over drive
protection
ON when 50M and 28M band are
selected
ON when ANT1 is selected dur-
ing reception
ON when ANT3 is selected dur-
ing reception
ON when ANT2 is selected dur-
ing reception
ON when ANT4 is selected dur-
ing reception
ON when ANT4 is selected dur-
ing transmission
ON when ANT1 is selected dur-
ing transmission
ON when ANT2 is selected dur-
ing transmission
ON when ANT3 is selected dur-
ing transmission
Surge protect
RF power control
RF power control
Surge protect
Surge protect
DIGITAL UNIT (X46-3390-00)
Ref. No. Use/Function
IC1 MCU
IC2,3 DDR2 SDRAM
IC6 DAC
IC7 ADC
IC8 NAND fl ash
IC9 AND gate IC
IC201 MCU
IC202,203 DDR2 SDRAM
IC208 NAND fl ash
Triple inverter
IC209
(Unbuffer type)
IC401 DVI transmitter
IC402 Video DAC
IC403 Dual buffer
IC451 OP amplifi er
IC452 OP amplifi er
IC453 OP amplifi er
IC501 2ch high side SW
IC502,
USB transceiver
503
Ethernet PHY
IC601
chip
IC651,
Octal BUS buffer
652,653
IC701 USB 3ch hub
USB-UART
IC702
bridge
IC703 USB CODEC
IC704 High side SW
IC705 AND gate
IC706 OP amplifi er
IC707 OP amplifi er
IC708,709 3.3V AVR
Q1 Inverter switch
Q651 Power switch
Q652 Switch
Q701 Switch
TS-990S
Operation/Condition/Compatibility
Main application MCU
DDR2 166MHz
DA converter for SRECO and
MRECO
AD converter for SRECI and
MRECI
Program for IC1 and internal
memory
AHLT control
Sub application MCU
DDR2 166MHz
Program for IC201
Inverter for crystal oscillation and
buffer
DVI transmitter
Triple 8-bit video DAC
Level shift from 3.3V to 5V for
DSHSM and DSVSM
Reference voltage of OP amplifi er
supply
Active fi lter for SRECO signal
Active fi lter for MRECO signal
Over current protection for USB
VBUS
Universal serial bus transceivers
Ethernet physical layer transceiv-
er
Buffer for main display interface
USB 3ch hub device
USB-UART bridge device
USB audio device
Power suply switch for USB de-
vice
USB audio device full speed
select control
Active fi lter for USB audio analog
input
Active fi lter for USB audio analog
output
From 5A voltage line
AnRST control switch for IC1 and
IC201
Power supply control for 3.3V of
main display
Q651 ON/OFF switch
USB-UART bridge device active
signal switch
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