Kenwood TK 981 Service Manual

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2 TK-980/ 981 GENERAL INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced techni- cians familiar with similar types of commercial grade com- munications equipment. It contains all required service in- formation for the equipment and is current as of the publica- tion date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions, which are issued as required. ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment informa- tion, the full part identification number should be included. This applies to all parts : components, kits, and chassis. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification. PERSONNEL SAFETY The following precautions are recommended for person- nel safety : - DO NOT transmit if someone is within two feet (0.6 meter) of the antenna. - DO NOT transmit until all RF connectors are secure and any open connectors are properly terminated. - SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere. - All equipment should be properly grounded before power-up for safe operation. - This equipment should be serviced by only qualified technicians. PRE-INSTALLATION CONSIDERNATIONS 1. UNPACKING Unpack the radio from its shipping container and check for accessory items. If any item is missing, please contact KENWOOD immediately. 2. LICENSING REQUIREMENTS Federal regulations require a station license for each ra- dio installation (mobile or base) be obtained by the equip- ment owner. The licensee is responsible for ensuring trans- mitter power, frequency, and deviation are within the limits permitted by the station license. Transmitter adjustments may be performed only by a li- censed technician holding an FCC first, second or general class commercial radiotelephone operators license. There is no license required to install or operate the radio. 3. PRE-INSTALLATION CHECKOUT 3-1. Introduction Each radio is adjusted and tested before shipment. How- ever, it is recommended that receiver and transmitter op- eration be checked for proper operation before installation. 3-2. Testing The radio should be tested complete with all cabling and accessories as they will be connected in the final installa- tion. Transmitter frequency, deviation, and power output should be checked, as should receiver sensitivity, squelch operation, and audio output. QT equipment operation should be verified. 4. PLANNING THE INSTALLATION 4-1. General Inspect the vehicle and determine how and where the radio antenna and accessories will be mounted. Plan cable runs for protection against pinching or crush- ing wiring, and radio installation to prevent overheating. 4-2. Antenna The favored location for an antenna is in the center of a large, flat conductive area, usually at the roof center. The trunk lid is preferred, bond the trunk lid and vehicle chassis using ground straps to ensure the lid is at chassis ground. 4-3. Radio The universal mount bracket allows the radio to be mounted in a variety of ways. Be sure the mounting surface is adequate to support the radios weight. Allow sufficient space around the radio for air cooling. Position the radio close enough to the vehicle operator to permit easy access to the controls when driving. 4-4. DC Power and wiring 1. This radio may be installed in negative ground electrical systems only. Reverse polarity will cause the cable fuse to blow. Check the vehicle ground polarity before installa- tion to prevent wasted time and effort. 2. Connect the positive power lead directly to the vehicle battery positive terminal. Connecting the Positive lead to any other positive voltage source in the vehicle is not rec- ommended. CAUTION If DC power is to be controlled by the vehicle ignition switch, a switching relay should be used to switch the posi- tive power lead. The vehicle ignition switch then controls DC to the relay coil. 3. Connect the ground lead directly to the battery negative terminal. 4. The cable provided with the radio is sufficient to handle the maximum radio current demand. If the cable must be extended, be sure the additional wire is sufficient for the current to be carried and length of the added lead.

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3 TK-980/981 1 3 + -“ 7 6 13 15 5. INSTALLATION PLANNING -“ CONTROL STATIONS 5-1. Antenna system Control station. The antenna system selection depends on many factors and is beyond the scope of this manual. Your KENWOOD dealer can help you select an antenna sys- tem that will best serve your particular needs. 5-2. Radio location Select a convenient location for your control station radio which is as close as practical to the antenna cable entry point. Secondly, use your systems power supply (which supplies the voltage and current required for your system). Make sure sufficient air can flow around the radio and power supply to allow adequate cooling. SERVICE This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and align- ment procedures contained in this manual. Note When you modify your radio as described in system set- up, take the following precaution. The rating of pin 7 (SB) of the accessory connector cable (KCT-19) on the rear of the radio is 13.6V (1A). Insert a 1A fuse if you use the SB pin for external equipment. Accessory connector cable (KCT-19) If you do not intend to use the 3.5-mm jack for the exter- nal speaker, fit the supplied speaker-jack cap (B09-0235-05) to stop dust and sand getting in. GENERAL / OPERATING FEATURES Speaker-jack cap (B09-0235-05) 1. Operation Features The TK-980/981 is an 800MHz/900MHz band EFJ LTR-„¢ - compatible trunked radio designed to operate in both trunking and conventional modes. The programmable fea- tures are summarized. This model can handle up to 32 systems with up to 250 groups in each system. The transceiver can be used in both trunked mode and conventional mode. Systems, groups, and their functions are programmed. 2. Transceiver Controls and Indicators (Fig. 1) 2-1. Front Panel Controls All the keys on the front panel are momentary-type push buttons. The functions of these keys are explained below. -POWER key Transceiver POWER key. When the power is switched off, all the parameters, such as the system and group are stored in memory. When the power is switched on again, the transceiver returns to the previous conditions. -SYSTEM UP/DOWN key (Programmable) -SCAN key (Programmable) -MONITOR key (Programmable) -A, B, C and D key (Programmable) -VOLUME UP/DOWN key (Programmable) -BUSY/TX LED The BUSY indicator (Green LED) shows that the group is in use. The TX indicator (Red LED) shows that you are trans- mitting. 2-2. Programmable Keys The FPU (KPG-49D) enables programmable keys to se- lect the following functions. Auto tel, AUX-A, AUX-B (Only when voice scrambler is not selected), DTMF ID (BOT), DTMF ID (EOT), Display char- acter, Emergency (Only foot key), Function, Group down, Group up, Home group, Horn alert, Key lock, Memory (RCL/ STO), Memory (RCL), Memory (STO), Message mode (Only A key), Monitor A, Monitor B, Monitor C, Monitor D, Public address, Redial, Scan, Scan del/add, Scan temporary delete, Scrambler (Only when voice scrambler is selected), Send GPS, System down, System up, TEL disconnect, Volume down, Volume up and None. These functions the FPU programs to the function keys and described in the following sections. -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.

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30 TK-980/ 981 SEMOCONDUCTOR DATA / DESCRIPTION OF COMPONENTS DESCRIPTION OF COMPONENTS TX-RX Unit (X57-6520-XX) (A/2) -10 : TK-980 -11 : TK-981 Ref. No. Use / Function Operation / Condition IC1~3 Amplifier IC4 Switch IC5 D/A convert IC6 Amplifier IC7,8 Shift/store register IC9 5V AVR IC10 AF amplifier IC11 FM demodulation IC12 5V AVR IC13 DC amplifier Current detect/PC IC14 8V AVR IC15 Power supply logic circuit control IC16 9V AVR 8CL IC300 PLL synthesizer IC400 Power module RF power 15W Q1 AF switch Q2 Ripple filter Shift Register : BU4094BCFV
Terminal function (TX-RX unit (B/2) IC508) Pin No. Port Name Function 1 ES ES1 Strobe 2 DT DAT Data 3 CK Clock 4 Q1 LEDR Red LED. H : ON, L : OFF 5 Q2 LEDG Green LED. H : ON, L : OFF 6 Q3 KEYBLT Key back light. H : ON, L : OFF 7 Q4 MMUTE MIC mute. H: Mute, L : Unmute 8 VSS GND 9NC 10 NC 11 Q8 PA2 Public address 2. H : ON, L : OFF 12 Q7 BSHIFT Beat shift. H : ON, L : OFF 13 Q6 KEY TX power switching. H : TX, L : RX 14 Q5 T/R TX/RX switching. H : RX, L : TX 15 OE Output enable 16 VDC +5V
Terminal function (TX-RX unit (A/2) IC8) Pin No. Port Name Function 1 STB ES Strobe 2 SI DT Data 3 CLK CK Clock 4 Q1 AM1 Audio mute 1. H : Mute, L : Unmute 5 Q2 LOK Link complete. (Programmable active H/L) 6 Q3 POR Buffer amplifier and mixer switch. H : Normal, L : Power sw on (an instant) 7 Q4 DM Dead mute. H : RX, L : TX 8 VSS GND 9 QS IC7 data output 10 NC 11 Q8 SQ External squelch. (Programmable active H/L) 12 Q7 CODE2 Option board data 2. H : ON, L : OFF 13 Q6 CODE1 Option board data 1. H : ON, L : OFF 14 Q5 OPT Option board control. H : ON, L : OFF / Auxiliary B. (Programmable active H/L) 15 OE Output 16 VDC +5V.
Terminal function (TX-RX unit (A/2) IC7) Pin No. Port Name Function 1 STB ES Strobe 2 SI DT Data 3 CLK CK Clock 4 Q1 HORN Horn alert. H : ON, L : OFF 5 Q2 H/L NC 6 Q3 TIMOFF Timed power off. H : Power off 7 Q4 CODE3 Option board data 1. H : ON, L : OFF 8 VSS GND 9NC 10 NC 11 Q8 W/N Wide/Narrow switching. (Not used) H : Wide, L : Narrow 12 Q7 BUSY Trunked system busy. H : Not busy, L : Busy 13 Q6 PA1 Public address 1. H : ON, L : OFF 14 Q5 CODE4 Option board data 1. H : ON, L : OFF 15 OE Output enable 16 VDC +5V