Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S225TERMINAL FUNCTIONPin No. Name I/O Function12 SIBK O IF blanking for SRX-DSP H: Mute13 MIBK O IF blanking for TXMRX-DSP H: Mute14 SABK2 O AF blanking 2 for SRX-DSP H: Mute15 SABK1 O AF blanking 1 for SRX-DSP H: Mute16 MABK2 O AF blanking 2 for TXMRX-DSP H: Mute17 MABK1 O AF blanking 1 for TXMRX-DSP H: Mute18 MAGCV I Automatic gain control voltage formTXMRX-DSP (to RX unit)19 MCTDET I CTCSS detection from TXMRX-DSPH: Detection20 SCTDET I CTCSS detection from SRX-DSPH: Detection21 NC - No connection22 33SD O 3.3V (DC/DC)23 33SD O 3.3V (DC/DC)24 NC - No connection25 DGND - Digital GND26 DGND - Digital GND27 GND - GND28 GND - GND29 NC - No connection30 5A O 5V (DC/DC)31 5A O 5V (DC/DC)32 NC - No connectionCN73 (to Accessory (SCOPE) unit A/10 CN35)1 SCPUL I Unlock detection H: LOCK2 SCDEN3 O DDS3 (IC3) enable signal3 SCDEN2 O DDS2 (IC2) enable signal4 SCDEN1 O DDS1 (IC1) enable signal5 SCPEN2 O PLL2 (IC6) enable signal6 SCPEN1 O PLL1 (IC4) enable signal7 SCPDT O Serial data8 SCPCK O Serial clock9 SCATT3 O Attenuator 3 control10 SCATT2 O Attenuator 2 control11 SCATT1 O Attenuator 1 control12 SCATT0 O Attenuator 0 control13 IFSEL4 O IF select 414 IFSEL3 O IF select 315 IFSEL2 O IF select 216 IFSEL1 O IF select 117 X42V1 I Version detection signalH: ver.1, L: ver.218 33SD O 3.3V (DC/DC)19 NC - No connection20 5A O 5V (DC/DC)21 NC - No connectionPin No. Name I/O Function22 GND - GND23 NC - No connection24 8A I 8V (DC/DC)DSP unit (X53-4530-00)Pin No. Name I/O FunctionCN1 (to DC-DC unit A/3 CN190)1 14AF I Switched 14V for AF power amplifi er2 GND - Power amplifi er GNDCN2 (to Control unit CN1)1 14SD I Non-switched 14V for switching regulator2 NC - No connection3 GND - Switching regulator GNDCN50 (to DC-DC unit A/3 CN210)1 SP O AF output for internal speaker2 SPG - Speaker GNDCN101 (to Control unit CN72)1 NC - No connection2 5A I 5V (DC/DC)3 5A I 5V (DC/DC)4 NC - No connection5 GND - GND6 GND - GND7 DGND - Digital GND8 DGND - Digital GND9 NC - No connection10 33SD I 3.3V (DC/DC)11 33SD I 3.3V (DC/DC)12 NC - No connection13 SCTDET O CTCSS detection from SRX-DSPH: Detection14 MCTDET O CTCSS detection from TXMRX-DSPH: Detection15 MAGCV O Automatic gain control voltage formTXMRX-DSP16 MABK1 I AF blanking for TXMRX-DSP H: Mute17 MABK2 I AF blanking for TXMRX-DSP H: Mute18 SABK1 I AF blanking for SRX-DSP H: Mute19 SABK2 I AF blanking for SRX-DSP H: Mute20 MIBK I IF blanking for TXMRX-DSP H: Mute21 SIBK I IF blanking for SRX-DSP H: Mute22 14SW I Power down for switching regulator ICH: Power ON23 TXC I TX ON/OFF H: TX ON24 CKY I RF power ON/OFF H: RF power ON