Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S234TERMINAL FUNCTIONPin No. Name I/O Function3 8A O 8V (DC/DC)4 8A O 8V (DC/DC)5 X55V2 PRESEL unit version control6 GND - GND7 GND - GND8 PSEL O PRESEL ON9 PSEN O PRESEL serial/parallel IC enable10 PSEEN O EEPROM enable11 PSECK O EEPROM clock12 PSESI I EEPROM serial data input13 PSEDA O EEPROM data ouput14 DATA O Serial data15 CLK O Serial clock16 33S O 3.3V (DC/DC)CN80 (to RX unit A/2 CN81)1 NB O NB IF output (Coaxial)CN81 (to RX unit A/2 CN80)1 NB I NB IF input (Coaxial)CN89 (to PLL (MAIN) unit CN22)1 MLO1 I 1st local signal (Coaxial)CN104 (to PLL (MAIN) unit CN21)1 MLO2 I 2nd local signal (Coaxial)CN109 (to Accessory (SCOPE) unit A/10 CN2)1 SC08M O Scope signal output (Coaxial)CN137 (to DSP unit CN665)1 MRIF O RX IF output2 GND - GNDRX (BPF) unit (X55-313X-XX B/2)Pin No. Name I/O FunctionCN501 (to RX unit A/2 CN11)1 BPFI I BPF input (Coaxial)CN520 (to RX unit A/2 CN22)1 NRLY I Diode SW BPF block ON2 MBPF3 I BPF3 (1.705~2.5MHz) ON3 MBPF4 I BPF4 (2.5~4.1MHz) ON4 MBPF5 I BPF5 (4.1~6MHz) ON5 MBPF6 I BPF6 (6~7.5MHz) ON6 MBPF7 I BPF7 (7.5~10.5MHz) ON7 MBPF8 I BPF8 (10.5~14.5MHz) ON8 MBPF9 I BPF9 (14.5~18.5MHz) ON9 MBPF10 I BPF10 (18.5~21.5MHz) ON10 MBPF11 I BPF11 (21.5~26.5MHz) ON11 MBPF12 I BPF12 (26.5~35MHz) ON12 MBPF13 I BPF13 (40~46.5MHz) ONPin No. Name I/O Function13 MBPF14 I BPF14 (46.5~60MHz) ON14 NC - No connection15 8A I 8V (DC/DC)16 NC No connection17 RX14 I Switched 14V18 NC - No connection19 GND - GND20 GND - GND21 NC - No connection22 14S I 13.8V (DC/DC)CN534 (to RX unit A/2 CN13)1 BPFO O BPF output (Coaxial)TX-RX unit (X57-827X-XX A/2)Pin No. Name I/O FunctionCN1 (to Control unit CN37)1 MSMET I Main RX S-meter voltage2 SSMET I Sub RX S-meter voltage3 KEY1 O KEY down signal / Electric keyer dotsignal4 KEY2 O KEY down signal / Electric keyer dashsignal5 KYSR O KEY jack / PADDLE judgement signal6 SS O Standby switch7 PKSR O PTT output for data communication8 PKP I Invert PKS control signal9 MSQC I Main squelch control signal (to ACC2)10 SSQC I Sub squelch control signal (to ACC2)11 MANO-MU I Main ANO mute control signal12 SANO-MU I Sub ANO mute control signal13 SIBK I Sub RX IF blanking signal14 NC_TR - No connection (reserved)15 TXC I TX ON/OFF control signal16 CKY I CKY mute signal17 SRXC I Sub RX ON/OFF control signal18 TEN1 I Shift register (IC51, IC52) enable signal19 TEN2 I Shift register (IC53, IC54) enable signal20 DAEN2 I D/A converter (IC55) enable signal21 CLK I Serial clock22 DATA I Serial data23 GND - GND24 SFSM O Sub RX FM S-meter voltage25 SFSQL O Sub RX FM squelch voltage26 ALM O ALC meter voltage