Kenwood TK-280 Service Manual

Also see for TK-280: User manual Instruction manual Instruction manual Pricing and specification manual Service manual

TK-2804OPERATING FEATURES0 S, A, 2 B, and C 3 key (Programmable)- DTMF keypad (keypad model only)Press the keys on the telephone keypad to send DTMFtones.= Universal connectorConnect the external KMC-25 speaker/ microphone(optional) here. Otherwise, keep the supplied cover in place.* : MONITOR and LAMP are arbitrary names chosen forthese buttons. They can be used for any of the auxiliaryfunctions.2-3. Programmable keysThe FPU (KPG-49D) enables programmable keys to selectthe following functions.■ Trunking FormatAuto Tel, AUX(only when Voice Scrambler is not selected),Connect ID, Disconnect ID, Display Character, Emergency(only AUX key), Function, Group Down, Group Up, HomeGroup, Key Lock, Lamp, Memory (RCL/STO), Memory (RCL),Memory (STO), Monitor A, Monitor B, Monitor C, Monitor D,Redial, RF Power Lo, Scan, Scan Del/Add, Scan TemporaryDelete, Scrambler (Only when Voice Scrambler is selected),System Down, System Up, TEL Disconnect and none.■ Conventional FormatAUX(only when Voice Scrambler is not selected), ChannelDown, Channel UP, Connect ID, Disconnect ID, DisplayCharacter, Emergency (only AUX key), Function, Group Down,Group Up, Home Channel, Key Lock, Lamp, Memory (RCL/STO), Memory (RCL), Memory (STO), Monitor A, Monitor B,Monitor C, Monitor D, Operator Selectable Tone, Redial, RFPower Lo, Scan, Scan Del/Add, Scrambler (Only when VoiceScrambler is selected), Talk Around and none.These functions the FPU programs to the function keys aredescribed in the following sections.1) Auto TEL (Trunking Format)Automatically connects available repeaters that areconnected to telephone circuits when operating as LTRsystem. The time allocated to search for available repeatersis 60 seconds, after which connection failure occurs, a DTMFtone is output and the function terminates.If connection to an available circuit is made, only ID 253,EOT or hang-up time-out can terminate the function.2) AUXThis function can be programmed when the voice scramblerboard is not installed.If this key is pressed, an underscore (“_”) appears at theextreme right of the LCD and AUX port which is inside ofthe transceiver turns to the active level. If pressed again,the underscore disappears and the AUX ports turns to thedeactive level.3) Channel up/down (Conventional Format)When the key is pressed each time, the channel number tobe selected is incremented/decremented and repeats if heldfor one second or longer.This key works as the voice scrambler code selector in thevoice scrambler code select mode.4) Connect IDPressing this key in Conventional mode, automatically sendsthe preset Connect ID.5) Disconnect IDPressing this key in Conventional mode, automatically sendsthe preset Disconnect ID.6) Display character● Trunking FormatThis key switches the LCD display between the system/group number and system/group name.● Conventinal FormatThis key switches the LCD display between the group/channel number and group/channel name.7) Emergency● Trunking FormatPressing this key for longer than the programmed“Emergency Key Delay Time” causes the transceiver to enterthe emergency mode. The transceiver jumps to theprogrammed “Emergency System/Group” and transmits forthe programmed “Active Time”.The transceiver disables mic mute while transmitting. Afterfinishing transmission, the transceiver receivers for theprogrammed “Interval Time”. The transceiver mutes thespeaker while receiving. Following the above sequence, thetransceiver continues to transmit and receive.● Conventinal FormatPressing this key for longer than the programmed“Emergency Key Delay Time” causes the transceiver to enterthe emergency mode. The transceiver jumps to theprogrammed “Emergency Group/Channel” and transmits forthe programmed “Active Time”.The transceiver disables mic mute while transmitting. Afterfinishing transmission, the transceiver receivers for theprogrammed “Interval Time”. The transceiver mutes thespeaker while receiving. Following the above sequence, thetransceiver continues to transmit and receive.8) FunctionPressing this key causes the transceiver to display “FCN”.Then, pressing a DTMF key causes the correspondingprogrammed function to start. This key may be convenientwhen using many functions with the 12-key keypad (K3, K4type).