Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S48COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityD12 VCO frequencycontrol TLO1 VCO3D13 VCO frequencycontrol TLO1 VCO4D14 VCO frequencyshift TLO1 VCO3D15 VCO frequencyshift TLO1 VCO4D16 Switching ON when IFA is selectedD17 Switching ON when VCO3 is operateD18 Switching ON when VCO4 is operateD19 Doubler Doubler of SLO1 DDS outputD20,21 Switching Diode ORD22 Switching ON when IFA 30~60M,16~30M,10~16MHz is selectedD23 Switching ON when IFA 30k~10MHz isselectedD24 Switching Diode ORD25 Switching ON when IFB is selectedD26 Switching ON when IFB 7.0~7.3MHz isselectedD27 Switching ON when IFB 1.8~2.0MHz/3.5~5.0MHz is selectedD28~30 Switching Diode ORD32 Switching ON when IFA 30.0~60.0MHz isselectedD33 Switching ON when IFA 16.0~30.0MHz isselectedD34 Switching ON when IFA 10.0~16.0MHz isselectedD35 Switching ON when IFB 1.8~2.0MHz isselectedD36 Switching ON when IFB 14.0~21.5MHz isselectedD38 Switching Diode ORD39 Voltage shift Dorop input voltage of IC17D40,43 Switching ON when IFB 1.8~2.0MHz isselectedD44 Switching ON when IFA 30.0~60.0MHz isselectedD45 Switching ON when IFA 16.0~30.0MHz isselectedD46 Switching ON when IFA 10.0~16.0MHz isselectedD47 Switching ON when IFA 30k~10MHz isselectedD48,49 Switching ON when VCO1 or VCO2 operateD50,51 Switching ON when IFA 0.03~16.0MHz isselectedD52 Switching ON when IFA is selectedD53 Switching ON when IFB 14.0~21.5MHz isselectedRef. No. Use/Function Operation/Condition/CompatibilityD54 Switching ON when IFB 7.0~7.3MHz isselectedD55 Switching ON when IFB 1.8~2.0MHz/3.5~5.0MHz is selectedD56 SwitchingON one element when IFA isselected, and ON other elementwhen IFB is selectedD57 Protection ofreverse current PLL (IC1) lock detectD58 Protection ofreverse current PLL (IC10) lock detectD59 Protection ofreverse current PLL (IC16) lock detectD60 Voltage shift Input voltage shift of IC2, 3D63 Voltage shift Input voltage shift of IC20AT UNIT (X53-4410-00)Ref. No. Use/Function Operation/Condition/CompatibilityIC2 Amplifi er Current detectionIC3 Comparator Ampritude error detectionIC4 D fl ip-fl op Phase error detectionIC7 Amplifi er Voltage detectionIC8 Shift registerQ1: SRXIO “H” when RXANTON and SUB RX are selectedQ2: MRXIO “H” when RXANTON and MAIN RX are selectedQ3: DIV1 “H” when differentANT is selected MAIN RX andSUB RXQ4: DIV2 “H” when differentANT is selected MAIN RX andSUB RXQ5: RXANT “H” when RXANT isselectedQ6: ATS “H” when TX with AT ONQ7: ReservedQ8: ReservedIC300 Shift registerQ1: CI (1) “H” when antennatuner input side capacitor (2.5p)is selectedQ2: CI (2) “H” when antennatuner input side capacitor (5p) isselectedQ3: CI (3) “H” when antennaTuner input side capacitor (10p)is selectedQ4: CI (4) “H” when antennaTuner input side capacitor (18p)is selectedQ5: CI (5) “H” when antennaTuner input side capacitor (36p)is selectedQ6: CI (6) “H” when antennaTuner input side capacitor (74p)is selected