Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S52COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ303~306 Switching Touch panel SW (X1/Y1/Y2/X2)Q307 Switching Touch panel SW pull up onQ308 Switching Touch panel SW pressD1~8 Reverse currentprevention For key matrixD9 LED (Green) Key backlightD10 LED (Green) SPLITD11 LED (Green) Key backlightD12 LED (Yellow) SPLITD13~18 LED (Green) Key backlightD19 Reverse currentpreventionReduced voltage detection inter-rupt for BKCD20~22 LED (Green) Key backlightD23 LED (Green) Main busyD24 LED (Green) Key backlightD25 LED (Red) Main TXD26 LED (Green) Key backlightD27 LED (Green) Sub busyD28 LED (Green) Key backlightD29 LED (Red) Sub TXD31 LED (Yellow) HI/LO encoderD32,34 LED (Green) Key backlightD36 LED (Yellow) Key backlightD37~42 LED (Green) Key backlightD43 LED (Red) Key backlightD44 LED (Green) Key backlightD45,46 LED (Yellow) Key backlightD47~51 LED (Green) Key backlightD52 LED (Yellow) Key backlightD53,56 Reverse currentprevention MIC data lineD54 Poly-switch Current limit for MIC supply (8V)D55 Reverse currentprevention for MIC supply (8V)D61~63 LED (Green) Key backlightD301,303 Switching Catch diode for main and subdisplay backlightD302,306 Reverse currentprevention Main and sub display backlightD307,308 Surge protection Touch panel signal lineD501~504 LED (Green) Key backlightRX UNIT (X55-313X-XX)Ref. No. Use/Function Operation/Condition/CompatibilityIC1 D/A converterAo1: ReserveAo2: MIFGC Main RX IF gaincontrol voltageAo3: MNBL Main NB level con-trol voltageRef. No. Use/Function Operation/Condition/CompatibilityIC1 D/A converterAo4: ReserveAo5: ReserveAo6: ReserveAo7: ReserveAo8: ReserveIC2 Shift registerQ1: MBPF14 “H” when BPFof 35~40MHz or 46.5~60MHz isselectedQ2: MBPF13 “H” when BPF of40~46.5MHz band is selectedQ3: MBPF12 “H” when BPF of26.5~35MHz is selectedQ4: MBPF11 “H” when BPF of21.5~26.5MHz is selectedQ5: MBPF10 “H” when BPF of18.5~21.5MHz is selectedQ6: MBPF9 “H” when BPF of14.5~18.5MHz is selectedQ7: MBPF8 “H” when BPF of10.5~14.5MHz is selectedQ8: MBPF7 “H” when BPF of7.5~10.5MHz is selectedIC3 Shift registerQ1: MBPF6 “H” when BPF of6~7.5MHz is selectedQ2: MBPF5 “H” when BPF of4.1~6MHz is selectedQ3: MBPF4 “H” when BPF of2.5~4.1MHz is selectedQ4: MBPF3 “H” when BPF of1.705~2.5MHz is selectedQ5: MBPF2 “H” when BPF of522k~1.705MHz is selectedQ6: MBPF1 “H” when BPF of30~522kHz is selectedQ7: M6DB “L” when 6dB attenu-ator ONQ8: M12DB “L” when 12dB at-tenuator ONIC4 Shift registerQ1: MFIL1 “H” when 15kHz IFfi lter is selectedQ2: MFIL2 “H” when 6kHz IFfi lter is selectedQ3: MFIL3 “H” when 2.7kHz IFfi lter is selectedQ4: MFIL4 “H” when 500Hz IFfi lter is selectedQ5: MFIL5 “H” when 270Hz IFfi lter is selectedQ6: MFIL6 “H” when additionalIF fi lter is selectedQ7: MPRE1 “H” when preamp(PREAMP1) and post amp areONQ8: MPRE2 “H” when preamps(PREAMP2) and post amp are ONIC5 Shift registerQ1: MHFRGC “H” when 6dB IFattenuator is ONQ2: M50RGC “H” when 10dB IFattenuator is ONQ3: M455FIL “L” when 455kHzFM narrow fi lter is selectedQ4: MRXFM “H” when RX FMmode is selected