Disclaimer While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Kenwood reserves. • 800MHz/900MHz FM TRANSCEIVER TK-480/481 SERVICE MANUAL REVISED II This service manual applies to products with 30100001 or subsequent serial numbers. Whip antenna (T90-0636-25): TK-480 (T90-0640-25): TK-481 Knob (ENC) (K29-5232-03) Knob (VOL) (K29-5231-03) Knob (PTT) (K29-5157-03) Photo is TK-480/481 K2 type. (Produced in Singapore) ©. • KPG-35D for those radios.

TK-480/481 transceivers with a serial number of 30100001 or greater have a red triangle in the KENWOOD logo label (B43-1139-04) on the front panel. You will also find the model name plate marked as “Ver 2.0” on the rear of the transceiver. Operation Features The TK-480/481 is an 800/900MHz band EFJ LTR™-com- patible trunked radio designed to operate in both trunked and conventional modes. The programmable features are summarized. Model Trunking mode Conventional mode This model can handle up to 32 systems with up to 250 groups in each system.

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• TK-480/481 Auto TEL Automatically connects available repeaters that are con- nected to telephone circuits when operating as LTR system. The time allocated to search for available repeaters is 60 seconds, after which connection failure occurs, a DTMF tone 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. • System up/down When the key is pressed each time, the system number to be selected is incremented/decremented and repeats if held for one second or longer.

Telephone disconnect Pressing this key ends an RIC connection (disconnects the telephone line). None Sounds error operation beep, and no action will occur.

• TK-480/481 To unlock a system, select the system and press the key. The Delete ( ) indicator disappears to indicate that the sys- tem has returned to the scan sequence. The revert system is scanned even if it is locked out. If there a locked system, the Delete ( ) indicator flashes during fixed scanning. Radio password When the password is set in the transceiver, user can not use the transceiver unless enter the correct password. This code can be up to 6 digits from 0 to 9 and input with the keypad or selector, and “S” key.

• T h e A l p h a n u m e r i c T w o - w a y P a g i n g F u n c t i o n (FleetSync™) is a Kenwood proprietary protocol. It enables a variety of paging functions. • Status 80~99 (Special) Status numbers from 80 to 99 are reserved for special purposes. Entering these statuses from the DTMF keypad can be inhibited.

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Please notice that the following status numbers are used for special purposes; 80~87: Reserved for future use. 88: Terminates to emergency mode. • TK-480/481 Number of Retries Number of Retries is the maximum number of retry transmission when no acknowledgement is received in the Maximum ACK Wait Time. Increase this item to improve data communication reliability. TX Busy Wait Time TX Busy Wait Time is the maximum amount of time be- fore giving up the data transmission when the channel (or all the repeater channels for Trunking mode) is busy. • OPERATING FEATURES / REALIGNMENT 7-16.

Intercept Tone This tone indicates that the transceiver is out of range. It indicates that the PTT button is pressed, and transmission has started, but the repeater cannot be connected and talk- ing is not possible.

It is output until the PTT button is re- leased. • TK-480/481 5. Preface The TK-480/481 transceiver is programmed by using a personal computer, programming interface (KPG-36) and programming software (KPG-49D). The programming software can be used with an IBM PC or compatible. Figure 1 shows the setup of an IBM PC for programming.

• Notes: • To start the Firmware Programmer from KPG-49D, the Fpro path must be set up by KPG-49D Setup. • This mode cannot be entered if the Firmware Program- ming mode is set to Disable in the Programming soft- ware (KPG-49D). • TK-480/481 1.

Overview This transceiver is an 800/900MHz band EFJ LTR™ trunked system compatible FM portable transceiver that can be programmed to operate on both LTR and conventional systems. Circuit Configuration by Frequency The receiver is a double-conversion superheterodyne with a first intermediate frequency (IF) of 44.85MHz and a second IF of 455kHz. Audio amplifier circuit The demodulated signal from IC9 is amplified by IC8 (2/ 2), high-pass filtered, low-pass filtered, high-pass filtered, band-eliminate filtered,and de-emphasized by IC12. The signal then goes through an AF amplifier IC3 (2/2), an electronic volume control (IC4), and an AF switch (Q310 is on), and is routed to audio power amplifier (IC300), where it is amplified and output to the internal speaker. • TK-480/481 The signal from microphone passes through the limitter circuit in D11, and through the high-pass filter, the ALC cir- cuit, the low-pass filter, the high-pass filter, and pre-empha- sis/IDC circuit in IC12. When encoding DTMF, mute switch (Q7) is turned OFF for muting the microphone input signal. The signal passes through the D/A converter (IC4) for the maximum deviation adjustment, and enters the summing amplifier consisting of IC3 (2/2), and is mixed with the low.