Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S43COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ19 Switching ON when 1.705~2.1MHz bandLPF is selectedQ20 Switching ON when 21.5~30.0MHz bandLPF is selectedQ21 Switching ON when 14.5~21.5MHz bandLPF is selectedQ22 Switching ON when 7.5~10.5MHz LPF isselectedQ23 Switching ON when 4.0~5.5MHz LPF isselectedQ24 Switching ON when AT fan rotates at lowspeedQ25 Switching ON when AT fan rotates at lowspeedQ26 Switching ON when AT fan rotates at highspeedQ27 Switching ON when AT fan rotates at highspeedQ500 Switching ON when operates over driveprotectionQ502 Switching ON when 50M and 28M band areselectedQ800 Switching ON when ANT1 is selected dur-ing receptionQ801 Switching ON when ANT3 is selected dur-ing receptionQ802 Switching ON when ANT2 is selected dur-ing receptionQ803 Switching ON when ANT4 is selected dur-ing receptionQ804 Switching ON when ANT4 is selected dur-ing transmissionQ805 Switching ON when ANT1 is selected dur-ing transmissionQ806 Switching ON when ANT2 is selected dur-ing transmissionQ807 Switching ON when ANT3 is selected dur-ing transmissionD1 Reverse voltageprevention Surge protectD2 Detection RF power controlD3 Detection RF power controlD5 Reverse voltageprevention Surge protectD8 Protection Surge protectD9~17 Protection Surge protectD50 Attenuator RF power controlD51 Protection Surge protectD501 Reverse voltageprevention Surge protectD800~808 Protection Surge protectDIGITAL UNIT (X46-3390-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 MCU Main application MCUIC2,3 DDR2 SDRAM DDR2 166MHzIC6 DAC DA converter for SRECO andMRECOIC7 ADC AD converter for SRECI andMRECIIC8 NAND fl ash Program for IC1 and internalmemoryIC9 AND gate IC AHLT controlIC201 MCU Sub application MCUIC202,203 DDR2 SDRAM DDR2 166MHzIC208 NAND fl ash Program for IC201IC209 Triple inverter(Unbuffer type)Inverter for crystal oscillation andbufferIC401 DVI transmitter DVI transmitterIC402 Video DAC Triple 8-bit video DACIC403 Dual buffer Level shift from 3.3V to 5V forDSHSM and DSVSMIC451 OP amplifi er Reference voltage of OP amplifiersupplyIC452 OP amplifi er Active fi lter for SRECO signalIC453 OP amplifi er Active fi lter for MRECO signalIC501 2ch high side SW Over current protection for USBVBUSIC502,503 USB transceiver Universal serial bus transceiversIC601 Ethernet PHYchipEthernet physical layer transceiv-erIC651,652,653 Octal BUS buffer Buffer for main display interfaceIC701 USB 3ch hub USB 3ch hub deviceIC702 USB-UARTbridge USB-UART bridge deviceIC703 USB CODEC USB audio deviceIC704 High side SW Power suply switch for USB de-viceIC705 AND gate USB audio device full speedselect controlIC706 OP amplifi er Active fi lter for USB audio analoginputIC707 OP amplifi er Active fi lter for USB audio analogoutputIC708,709 3.3V AVR From 5A voltage lineQ1 Inverter switch AnRST control switch for IC1 andIC201Q651 Power switch Power supply control for 3.3V ofmain displayQ652 Switch Q651 ON/OFF switchQ701 Switch USB-UART bridge device activesignal switch