Kenwood TS-990S Service Manual

Also see for SP-990: Instruction manual

Contents

TS-990S58COMPONENTS DESCRIPTIONRef. No. Use/Function Operation/Condition/CompatibilityQ951,952 Switching Power supply control of sub RXcircuit (ON during sub reception)Q953,954 SwitchingPower supply control of sub RXpreamplifi er (ON when sub RXpreamplifi er is ON)Q955,956 SwitchingPower supply control of sub RXpreamplifi er (ON when sub RXpreamplifi er is OFF)Q957,958 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 73.095MHz is selected)Q959,960 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 11.374MHz is selected)Q961,962 Switching Power supply control of TXB(ON during transmission)Q963,964 SwitchingPower supply control of FM circuit(ON when TX FM mode is se-lected)Q965,966 Switching Power supply control of SRXB(ON during sub reception)Q967 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 73.095MHz is selected)Q968 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 11.374MHz is selected)Q969 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 73.095MHz is selected)Q970 SwitchingPower supply control of sub RX1st IF circuit (ON when sub RX1st IF of 11.374MHz is selected)Q971,972 SwitchingPower supply control of 3rd IF cir-cuit (ON when sub RX SSB, AMand CW mode are selected)Q973,974 SwitchingPower supply control of FM circuit(ON when RX FM mode is select-ed)Q975 Switching Power supply control of SRXB(ON during transmission)D103,104 Clipper External packet data inputD105 Surge protection ACC2 connector (7-pin SSQ)D106 Mute For main ANO muteD107 Mute For sub ANO muteD110~ 112 Surge protection ACC2 connector (2/5/9-pin)D113 Reverse currentprevention Invert PKS control signalD114 Surge protection METER connector (3-pin SS-MET)D115 Reverse currentprevention Linear amplifi er control signalD116 Surge absorption Relay (K101)D117 Surge protection METER connector (2-pin MS-MET)Ref. No. Use/Function Operation/Condition/CompatibilityD118 Reverse currentpreventionKEY connector (2-pin KEY down/Electric keyer dot signal)D119 Reverse currentpreventionKEY connector (3-pin KEY down/Electric keyer dash signal)D120,121 Surge protection ACC2 connector (6/10-pin)D171,172 Reverse currentprevention Linear amplifi er control signalD200 Surge protection Sub reciever RF signal inputD201 Surge absorption Relay (K201)D202 Surge absorption Relay (K202)D204,205 Surge absorption Internal circuit protectionD207 Switching Sub RX/TX changeover, on dur-ing sub receptionD208 Switching ON when sub receiveing over1.705MHz is selectedD209 Reverse currentprevention1/2: Sub receiving ON at30~522kHz2/2: Sub receiving ON at522kHz~1.705MHzD210 Switching ON when sub receiveing over1.705MHz is selectedD211,212 Switching ON when BPF of522kHz~1.705MHz is selectedD213,214 Switching ON when BPF of 30~522kHz isselectedD215,216 Switching ON when BPF of 1.705~2.5MHzis selectedD217,218 Switching ON when BPF of 2.5~4.1MHz isselectedD219,220 Switching ON when BPF of 4.1~6.9MHz isselectedD221,222 Switching ON when BPF of 6.9~7.5MHz isselectedD223,224 Switching ON when BPF of 7.5~10.5MHz isselectedD225,226 Switching ON when BPF of 10.5~13.9MHzis selectedD227,228 Switching ON when BPF of 13.9~14.5MHzis selectedD229,230 Switching ON when BPF of 14.5~21.5MHzis selectedD231,232 Switching ON when BPF of 21.5~30MHz isselectedD233,234 Switching ON when BPF of 30~60MHz isselectedD235,236 Switching ON when BPF of 49~54MHz isselected (TX only)D237,238 Switching ON when sub receiving preampli-fi er is OFFD239,240 Switching ON when sub receiving preampli-fi er is OND251,252 Surge absorption Internal circuit protection