Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S217TERMINAL FUNCTIONDigital unit (X46-3390-00)Pin No. Name I/O FunctionCN1 (to DC-DC unit A/3 CN190)1 33V I Digital 3.3V2 GND - Digital GND3 5D I Digital 5.0V4 GND - Digital GNDCN2 (to DC-DC (APP) unit C/3 W801)1 1.8V_4 I Digital 1.8V2 1.8V_1 I Digital 1.8V3 1.8V_1 I Digital 1.8V4 1.2V_3 I Digital 1.2V5 1.2V_3 I Digital 1.2V6 1.2V_3 I Digital 1.2V7 DGND - Digital GND8 DGND - Digital GND9 DGND - Digital GNDCN3 (to DC-DC (APP) unit C/3 CN803)1 DC18SW O Switch signal for digital 1.8V DC/DCconverter2 GND - Digital GND3 NC - No connection4 GND - Digital GND5 DC12SW O Switch signal for digital 1.2V DC/DCconverter6 GND - Digital GNDCN4 (to Control unit CN71)1 5D O Digital 5V2 NC - No connection3 PSC I Power switch control4 LCDREQ I LCD request from main MCU5 GND - Digital GND6 PATXD I Serial data input from panel MCU7 PARXD O Serial data output to panel MCU8 GND - Digital GND9 SCCLK I Scope CLK from scope DSP10 DREQAP I Interrupt signal from scope DSP11 SCSIMO I Scope signal slave input master output12 SCSOMI O Scope signal slave output master input13 SCCS0 I Scope signal chip select from scope DSP14 33SW2 I Switch signal for digital 3.3V FET(Q803)15 33SW1 I Switch signal for digital 3.3V FET(Q805)16 USBSW I Switch signal for USB device17 ARST I Reset for APP MCU18 AHLT O APP check signal19 MACTS O RTS signal output to main MCUPin No. Name I/O Function20 MARTS I RTS signal input from main MCU21 MARXD O Serial data output to main MCU22 MATXD I Serial data input from main MCU23 BKC I Reduced voltage detect interrupt24 32KOUT I 32kHz CLK from main MCU25 VBINT O USB connect interrupt input26 NC - No connection27 VCTS O RTS signal output to main MCU for USB-serial bridge28 VRTS I RTS signal input from main MCU forUSB-serial bridge29 VRXD O Serial data output to main MCU for USB-serial bridge30 VTXD I Serial data input from main MCU forUSB-serial bridge31 DC12SW I Switch signal for digital 1.2V DC/DCconverter32 DC18SW I Switch signal for digital 1.8V DC/DCconverterCN11 (to DSP unit CN672)1 SRECO O Sub RX analog output for play2 AGND - Analog GND3 MRECO O Main RX analog output for play4 AGND - Analog GND5 MRECI I Main RX analog input for REC6 AGND - Analog GND7 SRECI I Sub RX analog input for REC8 AGND - Analog GND9 MUANO I Main RX analog input for USB10 AGND - Analog GND11 SUANO I Sub RX analog input for USB12 AGND - Analog GND13 UANI O Analog output for USB14 AGND - Analog GND15 NC - No connection16 5A I Analog 5VCN225 (to Display (MAIN LCD BACK) unit B/6 CN405)1 VSS - Sub display system GND2 RESB O Sub display system reset3 CSB O Not used4 SCK O Not used5 SDI O Not used6 VSS - Sub display system GND7 BB0 O Graphic blue data 0 output for sub display8 BB1 O Graphic blue data 1 output for sub display9 VSS - Sub display system GND10 BB2 O Graphic blue data 2 output for sub display