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Detailed SONY CFD980 Service Manual at an easy to find one stop shopping. Make my radio hobby technically interesting. Thanks.
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KRC-108S/165/189 (REVISED)
MICROCOMPUTER�S TERMINAL DESCRIPTION
Pin No. 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44,45 46 47 48 49 50 51 52 53 54 55 56 57 58~68 69~90 91 92 93 94 95~97 98,99 100 SD TUN_SCL TUN_SDA IFC AM+B FM+B SCK SDA NC RESET NC NC XIN XOUT Vss IC2TYPE1 IC2TYPE2 NC SEL1, SEL2 MUTE STBY SVR ACCDET BUDET PNCMUTE ANTCON PNCCON ILLCON PORT ON/OFF SW5 EQNCMUTE NC SEG22~SEG1 Vcc VREF Avss NC COM3~COM1 VL3,VL2 C2 Pin Name I/O I O I/O O O O O I/O O I O O I I O I O O O I I O O O O O O O O O O I Application Station detected Clock output for F/E Data input/output for F/E Not used Power output for AM Power output for FM Clock output for IC2 Data input/output for IC2 Not used Reset input Not used Not used Clock input Clock output Power input (0V) IC2 setting switching IC2 setting switching Not used Destination switching Mute ON/OFF POWER IC standby control POWER IC SVR control ACC detection Instantaneous reduction Power IC mute External antenna control Power control output Illumination control Port control 5V-system power source control Not used Not used LCD segment output Power input (5V) A/D standard voltage input Analog power input (Vss) Not used LCD common output LCD power input Not used GND connection q H : MUTE ON POWER IC ON : H, OFF : L When reduction inpower is detected : H, Normal : L ACC detected : L, ACC not detected : H BU detected : L, BU not detected (Instant reduction) : H L : MUTE ON, POWER OFF and ALL OFF : L H : ANTCON ON H : P-CON ON H : Backlight ON For error prevention when µ-com is unstable. Output : L L : ON, HI-Z : OFF (H during instantaneous reduction, L when power consumption is low other than instantaneous reduction. 8.000MHz (L77-2032-05) Normal : H, RST : L Not used (but Pull down at 10K) H : AM+B ON H : FM+B ON Truth Value Table Processing Operation Description H : Station detected
Truth Value Table q Destination KRC-108S KRC-165/189 RX-290 SEL1 L L H SEL2 L H X
X : Not applicable (PULL DOWN in effect)
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