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Kenwood TK-280 Service Manual
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Kenwood TK-280 Service Manual

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See also: Instruction Manual
VHF FM TRANSCEIVER
TK-280
SERVICE MANUAL
E VERSIONS
Knob (PTT etc)
(K29-5157-03)
Photo is E type with KRA-14
Helical antenna
GENERAL ................................................................................. 2
(T90-0680-05):T
SYSTEM SET-UP ..................................................................... 2
(T90-0695-15):E
OPERATING FEATURES ......................................................... 3
Knob (ENC)
(K29-5232-03)
REALIGNMENT ...................................................................... 16
CIRCUIT DESCRIPTION ........................................................ 20
Knob (VOL)
SEMICONDUCTOR DATA ..................................................... 26
(K29-5231-03)
DESCRIPTION OF COMPONENTS ....................................... 32
PARTS LIST ............................................................................ 33
EXPLODED VIEW .................................................................. 40
Panel assy
(A62-0535-04)
PACKING ................................................................................ 41
Badge
ADJUSTMENT ........................................................................ 42
(B43-1106-14)
TERMINAL FUNCTION .......................................................... 52
Cabinet assy
(A02-2055-53)
(16 keys)
SCHEMATIC DIAGRAM ......................................................... 65
BLOCK DIAGRAM .................................................................. 69
LEVEL DIAGRAM ................................................................... 71
OPTIONS ................................................................................ 72
SPECIFICATIONS ............................................... BACK COVER
Packing
(G53-0896-02)
(16 keys)
©
2000-4 PRINTED IN JAPAN
B51-8521-00(S) 553
CONTENTS
DISPLAY UNIT (X54-3210-12) ............................................ 53
TX-RX UNIT (X57-6192-70) ................................................ 59
CAUTION
When using an external power connector,
please use with maximum final module
protection of 9V.

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Summary of Contents for Kenwood TK-280

  • Page 1: Table Of Contents

    VHF FM TRANSCEIVER TK-280 SERVICE MANUAL © E VERSIONS 2000-4 PRINTED IN JAPAN B51-8521-00(S) 553 CONTENTS Helical antenna GENERAL ................. 2 (T90-0680-05):T SYSTEM SET-UP ..............2 (T90-0695-15):E OPERATING FEATURES ............3 Knob (ENC) (K29-5232-03) REALIGNMENT ..............16 CIRCUIT DESCRIPTION ............20 Knob (VOL) SEMICONDUCTOR DATA .............

  • Page 2: General

    Frequency range (MHz) RF power Type Choose the type of transceiver TX/RX 146~174 5.0W TK-280 E,T Transceiver programming A personal computer (IBM PC or compatible), programming interface (KPG-36), and programming software (KPG-60D) are required for programming. (The frequency, conventional system features, TX power HI/LOW, and signalling data are programmed for the transceiver.)

  • Page 3: Operating Features

    2 Group or Channel selector knob (Programmable) 1. Operation Features Turning the group (or channel) selector knob clockwise The TK-280 is a VHF FM Radio designed in both 5tone increases the group (or channel) number by one. Turning Model and DTMF/2tone/DMS Model. The programmable the knob in the counterclockwise direction decreases the features are summarized.
  • Page 4 TK-280 OPERATING FEATURES 2-3. Programmable keys The FPU (KPG-60D) enables programmable keys to select the following functions. Function DTMF/2tone/DMS Model 5tone Model note None Auto Dial Auto Dial Programming AUX B Only when voice scrambler is not selected Call 1...
  • Page 5 TK-280 OPERATING FEATURES Auto Dial Channel Entry To transmit the stored DTMF code automatically. You can directly recall the channel using the numeric keypad When you select DTMF Encode in the “Auto Dial Mode” without using the [Channel Up/ Down].
  • Page 6 TK-280 OPERATING FEATURES Lamp Queue Press the [Lamp] key to toggle the display backlight ON or Press [Queue] key to toggle Queue mode ON or OFF. OFF. The backlight automatically turns OFF approximately 5 When it is ON, you will see the contents of the Queue buffer.
  • Page 7 TK-280 OPERATING FEATURES Scrambler Shift Press the [Scrambler] key to toggle the Scrambler ON or It allows you to enable [Shift + Function] key access. When OFF. When it is activated, “_” (underscore) appears on LCD. [Shift] key is pressed, SFT appears on LCD.
  • Page 8 TK-280 OPERATING FEATURES 2-4. Display 3. Scan Operating 1) Scan types Single Group Scan You can scan all valid (ADD) channels in the displayed group that can be selected with the group selector. Multiple Group Scan You can scan all valid (ADD) channels in the all valid (ADD) group.
  • Page 9 TK-280 OPERATING FEATURES 7) Revert Channel 4. Details of Features The revert channel is used to transmit during scanning and 1) Time-out timer set by the programming software (KPG-60D). The time-out timer can be programmed off or in 30 seconds 1 Priority increments from 30 seconds to five minutes.
  • Page 10 TK-280 OPERATING FEATURES 9) "TOT" Reset Time 15) Auto Light on The transceiver has "TOT" reset timer. This timer is the You can use the transceiver to turn on the backlight minimum wait time allowed during a transmission that will reset automatically when a key is pressed.
  • Page 11 Please notice that the following status numbers are used General for special purposes; The Alphanumeric Two-way Paging Function (DMS) is a Kenwood proprietary protocol. It enables a variety of paging 80~89 : Reserved for future use. functions. 90 : Remote kill on. Disable all transceiver functions.
  • Page 12 TK-280 OPERATING FEATURES Short Messase (Optional) Parameters A maximum of 48 characters can be sent (External GTC Count equipment is required). Received Short Messages will be Number of “Go To data Channel” messages to be sent displayed in the same manner as a Status Message. A...
  • Page 13 Receive Code, #01. Range: You can receive the Receive Code after the modification. ZVEI, CCIR, EEA, PZVEI, DZVEI, PCCIR, PDZVEI, ZVEI- 2, EIA, Natel, AP-369, Kenwood Selectable Selcall Digit Select the check box to change Selcall Code (maximum 8 Monitor Function digits) manually when transmitting Encode Code.

  • Page 14: Audible User Feedback Tones

    TK-280 OPERATING FEATURES Copy from TX/RX Address Programmable Alert Tone You can select to copy the digit to the memory when you You can program the alert type from type 1 to type 8, when change the channel, using [Selector] key.
  • Page 15 TK-280 OPERATING FEATURES Key press tone [A] Sounds when a key is pressed. For toggle keys, sounds when toggle function is turned on (key press tone [B] sounds when it is turned off). Key press tone [B] Sounds when a key is pressed. For toggle keys, sounds when the toggle function is turned off (key press tone [A] sounds when it is turned on).

  • Page 16: Realignment

    PC tuning mode PC test mode Clone mode 5-2. Connection procedure 1. Connect the TK-280 to the personal computer with the Self programming interface cable. mode 2. When the POWER switch on, user mode can be entered immediately. When PC sends command the radio enter PC...

  • Page 17: Clone Mode

    6-3. Programming 1. Start up the firmware programming software (Fpro.exe). 1. Turn the master TK-280 power ON with the [D] key held 2. Set the communications speed (normally, 57600 bps) and down. If the Data password is set to the TK-280, the TK- communications port in the configuration item.

  • Page 18: Self Programming Mode

    TK-280 REALIGNMENT 8-2. Channel Setting Mode 6. Press the [D] key on the master while the master displays "CLONE MODE". The data of the master is sent to the slave. This is a mode for making channel settings with the panel While the slave is receiving the data, "PROGRAM"...
  • Page 19 TK-280 REALIGNMENT Flow Chart Self programming mode [MON] [MON] Channel setting mode Channel selection Group selection [MON] RX frequency [CALL] [CALL] [C]/[D] [MON] RX signalling DQT N DQT I [CALL] [CALL] [CALL] [C]/[D] [MON] TX frequency [CALL] [CALL] [C]/[D] [MON]...

  • Page 20: Circuit Description

    TK-280 CIRCUIT DESCRIPTION 1. Overview the D/A converter (IC8). The signal is amplified by RF amplifier (Q24), and passed through the bandpass filter (L31,33) and This transceiver is VHF/FM portable transceiver designed band-eliminate filter (L27,29) to remove the spurious signal to operate in the frequency range of 146 to 174MHz (E, T).
  • Page 21 TK-280 CIRCUIT DESCRIPTION Q305 Q304 C266 INT.SP EXT.SP IC12 FM IF SYSTEM Q308 "H" : Wide,Semi wide IC300 "L" : Narrow Q301 Fig. 4 Audio amplifier circuit 3-5. Squelch circuit The output from IC12 enters FM IC again, then passed through a band-pass filter.
  • Page 22 1 of the VCXO. The output of the VCXO is applied to pin 8 of the PLL IC. MUTE DTMF EXT. The TK-280’s VCO consists of 2VCO and covers a dual IC13 range of the 190.85~218.85MHz (E,T) and the 146~174MHz Q300 IC25(1/2) COMP (E,T).
  • Page 23 TK-280 CIRCUIT DESCRIPTION 6-2. Low battery warning The battery voltage is monitored by the microprocessor BUFF drive (TX : Low) (IC19). When the battery voltage falls below the voltage set by the Low Battery Warning adjustment, the red LED flashes to BUFF notify the operator that it is time to replace the battery.
  • Page 24 TK-280 CIRCUIT DESCRIPTION 7-2. Decode 7. Signalling Circuit Low-speed data (QT,DQT) 7-1. Encode The demodulated signal from the IF IC (IC12) is amplified Low-speed data (QT,DQT) by IC4 (2/2) and passes through a low-pass filter (IC11) to Low-speed data is output from pin 1 of the CPU. The signal remove audio components.
  • Page 25 TK-280 CIRCUIT DESCRIPTION 8. Power Supply Circuit 9. Optional Board Terminal Battery +B is supplied via a 3A fuse from the battery terminal Terminals for mounting the option board are provided at connected to the TX-RX unit. After passing through the power the bottom edge of the TX-RX unit.

  • Page 26: Semiconductor Data

    TK-280 SEMICONDUCTOR DATA Microprocesser : 30620M8-394GP (TX-RX UNIT : IC19) Pin function Port Port Function Function Name Name LSDOUT O Low speed data output. GND. HSDOUT High speed data output. 63~70 A0~A7 Flash memory address bus. HSDIN High speed data input.
  • Page 27 TK-280 SEMICONDUCTOR DATA Shift register 2 : BU4094BCFV (TX-RX UNIT : IC22) Pin function Port Port Name Function Strobe Data Clock Audio mute 1. H : Unmute, L : Mute TX Logic Signal output. Active logic level is Low. Logic type can select “TX Line”...
  • Page 28 TK-280 SEMICONDUCTOR DATA Audio Processor : TC35453F (TX-RX Unit : IC13) Block diagram Pin function Port Port Function Function No. Name No. Name RXFO RX audio filter output. Data synchronized clock input. RXGS RX audio signal level setting amplifier REGS1 Internal register select input 1 output.
  • Page 29 TK-280 SEMICONDUCTOR DATA D/A Converter : M62364FP (TX-RX Unit : IC8) Block diagram Pin function Pin No. Pin code I/O Function Pin No. Pin code I/O Function D/A converter input. 10,11 VO3,VO4 8-bit resolution D/A. VO1,VO2 8-bit resolution D/A. 12,13 VI4,VI5 D/A converter input.
  • Page 30 TK-280 SEMICONDUCTOR DATA PLL System : SA7025DK (TX-RX Unit : IC14) Audio Power Amplifier : TDA7053AT Block diagram (Display Unit : IC300) Block diagram Pin description Pin description Pin No. Symbol Description Pin No. Symbol Description CLOCK Serial clock input.
  • Page 31 TK-280 SEMICONDUCTOR DATA VCO System : X58-4580-10 (SUB Unit : A1) Voltage Detector : RN5VL42C Circuit diagram (TX-RX Unit : IC3) Block diagram (CMOS output) X58-4580-10 SUB UNIT Pin function Pin No. Pin code Function Output. Power supply. Ground. Counter : MC74HC4017F (Display Unit : IC301) Input CLOCK (pin No.14) - Clock Input...

  • Page 32: Description Of Components

    TK-280 DESCRIPTION OF COMPONENTS DISPLAY UNIT (X54-3210-12) Ref. No. Use/Function Operation/Condition Ref. No. Use/Function Operation/Condition IC300 Audio power amplifier Transistor IF W/N switch sets to on when Wide IC301 Counter /Key scan Transistor Ripple filter Q300 DC switch / INT MIC on/off...

  • Page 33: Parts List

    TK-280 PARTS LIST L: Scandinavia K: USA P: Canada ∗ New Parts. indicates safety critical components. Y: PX (Far East, Hawaii) T: England E: Europe Parts without Parts No. are not supplied. Y: AAFES (Europe) X: Australia M: Other Areas Les articles non mentionnes dans le Parts No.
  • Page 34 TK-280 PARTS LIST DISPLAY UNIT (X54-3210-12) TX-RX UNIT (X57-6192-70) TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts L308,309 L92-0141-05 FERRITE CHIP X57-6192-70 TX-RX UNIT TX-RX UNIT (X57-6192-70) CP300,301 R90-0723-05...
  • Page 35 TK-280 PARTS LIST TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts CC73GCH1H220J CHIP C 22PF C137 CC73GCH1H100D CHIP C 10PF CK73GB1C683K CHIP C 0.068UF K C138 CK73GB1H102K CHIP C...
  • Page 36 TK-280 PARTS LIST TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts C213 CK73FB1C474K CHIP C 0.47UF CN5 -12 E23-1081-05 TERMINAL C214 CC73GCH1H330J CHIP C 33PF C215 CC73GCH1H101J CHIP C...
  • Page 37 TK-280 PARTS LIST TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts RK73GB1J103J CHIP R 1/16W CP6 -21 R90-0741-05 MULTIPLE RESISTOR 1K RN73GH1J913D CHIP R D 1/16W CP22-24 R90-0743-05 MULTIPLE RESISTOR 47K...
  • Page 38 TK-280 PARTS LIST TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts R298 R92-1252-05 CHIP R 0 OHM R137 RK73HB1J103J CHIP R 1/16W R300 R92-1252-05 CHIP R 0 OHM R139,140...
  • Page 39 TK-280 PARTS LIST TX-RX UNIT (X57-6192-70) SUB UNIT (X58-4580-10) TX-RX UNIT (X57-6192-70) Ref. No. Address Parts No. Description Destination Ref. No. Address Parts No. Description Destination parts parts IC20 AT2416N10SI2.5 IC(EEPROM) IC21,22 BU4094BCFV IC(SHIFT REGISTER) IC23 NJM2904V IC(APC) L40-3391-37 SMALL FIXED INDUCTOR(3.3UH)

  • Page 40: Exploded View

    TK-280 EXPLODED VIEW Display unit (A/2) A NUT :N14-0569-04 B M2.6x4 :N30-2604-46 C M2.6x10 :N30-2610-46 D M2.6x6 :N67-2606-46 :N79-2025-46 F M2x5 :N83-2005-46 IC100 Sub unit TX-RX unit 21 55 Display unit (B/2) (CHASSIS) S/NO label (ESN) S/NO label Parts with the exploded numbers larger than 700 are not supplied.

  • Page 41: Packing

    TK-280 PACKING 38 Carton board (H13-1072-04) 6 Instrution mamual (B62-1266-00) 3 Cap (B09-0363-03) 52 Screw set (N99-2004-05) 37 Packing fixture (H12-3014-02) ANT Helical antenna 42 Hook (T90-0680-05):T (J29-0658-05) (T90-0695-15):E 39 Item carton case S/NO. label (ESN) (H52-1225-12) UPC code label...

  • Page 42: Adjustment

    TK-280 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range 146 to 174MHz (SSG) Modulation Frequency modulation and external modulation. Output -127dBm/0.1µV to greater than -47dBm/1mV Power Meter Input Impedance 50Ω. Operation Frequency 146 to 174MHz or more.
  • Page 43 ADJUSTMENT • Panel tuning Repair Jig (Chassis) Use jig (part No.: W05-0825-00) for repairing the TK-280. The jig facilitates the voltage check and protects the module when the voltage on the flow side of the TX-RX unit is checked 2: RED (RX AF OUTPUT) during pepairs.

  • Page 44: Test Mode

    TK-280 ADJUSTMENT Frequency and signalling Test Mode The set has been adjusted for the frequencies shown in the Test mode operating features following table. When required. re-adjust them following the This transceiver has a test mode. To enter test mode, press adjustment procedure to obtain the frequencies you want in [B] key and turn power on.
  • Page 45 TK-280 ADJUSTMENT LCD display (Tuning mode) LCD display (Test mode) FREQ Adjustment item Adjustment (1~256) channel No. Signalling No. Panel Tuning Mode Wide/Semi wide/Narrow E, T TEST Ch RX frequency (MHz) TX frequency (MHz) Press [A], now in tuning mode. Use [2 C] button to write 146.05000...
  • Page 46 TK-280 ADJUSTMENT Common Section Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 1. Setting 1) BATT terminal voltage:7.5V 2) SSG Standard modulation [Wide] MOD:1kHz, DEV:3kHz [Semi Wide] MOD:1kHz, DEV:2.4kHz [Narrow] MOD:1kHz, DEV:1.5kHz 2. VCO lock...
  • Page 47 TK-280 ADJUSTMENT Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 7. DQT Balance 1) Adj item [n BAL] Power meter Panel Panel Encoder...
  • Page 48 TK-280 ADJUSTMENT Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method ±50kHz 11.DQT 1) Adj item [n DQT] Power meter Panel Panel Encoder 0.35kHz Devition Adjust [∗∗∗]...
  • Page 49 TK-280 ADJUSTMENT Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 15.BATT 1) Adj item [BATT] Power meter Panel Panel Encoder After pressing BATT terminal Detection Adjust [∗∗∗]...
  • Page 50 TK-280 ADJUSTMENT Receiver Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 3. Squelch 1) Adj item [n SQL] Panel Panel Encoder Adjust to point (Preset) Adjust [∗∗∗]...
  • Page 51 TK-280 ADJUSTMENT Receiver Section [Panel Tuning Mode except when Panel TEST Mode is specified.] Measurement Adjustment Specifications/ Item Condition Remark Test equipment Unit Terminal Unit Parts Method 6. Squelch 1) Adj item [n SQLT] Panel Panel Encoder Adjust to point (Tight) Adjust [∗∗∗]...

  • Page 52: Terminal Function

    TK-280 TERMINAL FUNCTION CN No. Pin No. Name I/O Function CN No. Pin No. Name I/O Function TX-RX UNIT (X57-6192-70): TX-RX section PTT signal output. Not use. Power input after passing through LCD driver chip select input. the fuse. Audio mute signal input.

  • Page 53: Pc Board Views

    TK-280 PC BOARD VIEW DISPLAY UNIT (X54-3210-12) Component Side View DISPLAY UNIT (X54-3210-12) X54-3210-12 (B/2) S301 S302 S303 J72-0517-22 LAMP LCD ASSY CN302 ∗ D301 X54-3210-12 (A/2) – J72-0517-22 Component side Pattern 1 Pattern 2 Pattern 3 Pattern 4 Foil side...
  • Page 54 TK-280 PC BOARD VIEW DISPLAY UNIT (X54-3210-12) Foil Side View CN303 X54-3210-12 (B/2) J72-0517-22 DISPLAY UNIT (X54-3210-12) D321 R300 R302 R304 CN301 CN300 R303 R305 R301 C302 R311 R312 Q300 R306 CP300 L309 R325 R338 C331 C328 D320 R324 Q301...
  • Page 55 TK-280 PC BOARD VIEW DISPLAY UNIT (X54-3210-12) Component Side + Foil Side View CN303 X54-3210-12 (B/2) S301 S302 S303 J72-0517-22 LAMP DISPLAY UNIT (X54-3210-12) D321 R300 R302 LCD ASSY R304 CN301 R303 CN300 R305 CN302 R301 C302 R312 R311 Q300...

  • Page 56: Tx-Rx Unit (X57-6192-70)

    TK-280 PC BOARD VIEW PC BOARD VIEW TX-RX UNIT (X57-6192-70) Component Side View TX-RX UNIT (X57-6192-70) MONI R267 C244 LAMP C247 IC100 R271 C223 C224 R110 X57-6192-70 R258 R415 C138 C101 J72-0734-12 C217 C237 C140 R298 C123 C200 L406 C124...
  • Page 57 TK-280 PC BOARD VIEW TX-RX UNIT (X57-6192-70) Foil Side View TX-RX UNIT IC16 R100 (X57-6192-70) C246 C242 R114 C227 R109 R304 C119 R116 R123 R305 R253 C256 IC17 C136 R295 C120 X57-6192-70 CN10 C215 R254 R240 C228 J72-0734-12 C121 IC24...
  • Page 58 TK-280 PC BOARD VIEW TX-RX UNIT (X57-6192-70) TX-RX UNIT (X57-6192-70) Component Side + Foil Side View IC16 R100 MONI R267 C244 C246 LAMP IC100 C247 R271 C242 R114 C227 R109 R304 C119 R116 R123 C256 R305 R253 IC17 C136 C120...

  • Page 59: Schematic Diagram

    TK-280 SCHEMATIC DIAGRAM SCNLO Table on the left indicates the parts used among different serial numbers. Note : Component marked with a dot ( ) are parts of pattern1.

  • Page 60: Block Diagram

    TK-280 TK-280 TK-280 TK-280 BLOCK DIAGRAM LEVEL DIAGRAM KNB-16A/17A (Ni-Cd BATTERY) / KPG-36 (PROGRAMMING INTER- FACE CABLE) / KSC-19 (CHARGER) / KRA-14 (HELICAL ANTENNA) KNB-16A KNB-17A KPG-36 External View External View External View KNB-16A KNB-17A KSC-19 External View Circuit Diagram...
  • Page 61 TK-280 KMC-25 (SPEAKER MICROHONE) Circuit Diagram External View Specifications Microphone Impedance ......2kΩ Sensitivity ........ -65dB±4.0dB at 1kHz Speaker Impedance ......16Ω Input ........0.5W Maximum input ......1.5W Dimensions ........62W x 81 H x 29 D (mm) Weight (With plug cord) ....Approx. 0.17kg...

  • Page 62: Specifications

    KENWOOD ELECTRONICS TECHNOLOGIES(S) PTE LTD. KENWOOD ELECTRONICS U.K. LIMITED Sales Marketing Division KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom 1 Ang Mo Kio Street 63, Singapore 569110 KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands...

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