Kenwood TK-280 Service Manual Download

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TK-280

ADJUSTMENT

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
during pepairs.

How to Remove the Flat Cable

1. Gently draw out both sides of the connector lever uniformly

in the direction of the arrow with tweezers.
(CN300, CN301)

Tweezers

Lever

Flat cable

Jig

Power
module

Battery terminal (+)

Flat cable

Lever

Regular screwdriver

• Panel tuning

• PC tuning

Connect the wires to the PCB in the connector case of

interface cable.

For output the wires out of the connector case, need to

process the connector case.

11: GREEN (5M)

TUBE

SCREW

8: YELLOW (PF SW)

2: RED (RX AF OUTPUT)

3: BLACK (RX AF OUTPUT)

10: BROWN (GND)

6: BROWN (MIC GND)

5: WHITE (MIC INPUT)

7: BLUE (PTT SW) GND

→

RED (2)

BLK (3)

100

10V

100

10V

Ω

WHT

(5)

BRN (6)

BLU (7)

BRN (10)

PTT SW

To Radio

AF Voltmeter

Audio generator

10V

Connector case

KPG-36

PCB lay

Remove the
screw

PCB layout

Shield

AF voltmeter

Audio generator

100

10 V

100

10 V

Ω

2. Gently rise up the connector lever in the direction of the

arrow with a fine regular screwdriver or tweezers.
(CN1, CN3, CN304)

TX-RX unit

Summary of Contents for TK-280

Page 1: ...WS DISPLAY UNIT X54 3210 12 53 TX RX UNIT X57 6192 70 59 SCHEMATIC DIAGRAM 65 BLOCK DIAGRAM 69 LEVEL DIAGRAM 71 OPTIONS 72 SPECIFICATIONS BACK COVER CONTENTS CAUTION When using an external power connector please use with maximum final module protection of 9V Photo is E type with KRA 14 Knob ENC K29 5232 03 Knob VOL K29 5231 03 Cabinet assy A02 2055 53 16 keys Badge B43 1106 14 Packing G53 0896 02 ...

Page 2: ...Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions These are issued as required ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment information the full part identification number should be included This applies to all parts components kits or chassis If the part number is not known include the chassis or kit number of which it...

Page 3: ...nel number reaches the highest group number or channel number it goes back to lowest group number or channel number Group numbers or channel numbers not set are skipped Caution The FPU KPG 60D allows selecting between group selector and channel selector 3 Volume Power switch Transceiver Power and Volume switch Turn clockwise to switch On the transceiver Turn counterclockwise fully to switch OFF th...

Page 4: ...hannel Up Yes Yes Emergency Call Yes Yes Fixed Volume Yes Yes Group Down Yes Yes Group Up Yes Yes Home Channel Yes Yes Key Lock Yes Yes Lamp Yes Yes Low Power Yes Yes Monitor Yes Yes Monitor Momentary Yes Yes Operator Selectable Tone Yes Yes Queue Yes Yes Radio Password Yes Yes Receive Entry No Yes Scan Yes Yes Scan Delete Add Yes Yes Scrambler Yes Yes Selcall Entry Yes Yes Selcall List Yes Yes Se...

Page 5: ...er Call 1 to 6 5tone Press the CALL key to transmit the 5tone code that is programmed to Call in the System Parameters Channel Entry You can directly recall the channel using the numeric keypad without using the Channel Up Down To access the channel directly enter 1 to 3 digit numbers depending on the number of the programmed channels For example if the radio has 199 programmed channels the maximu...

Page 6: ...m the OST Select Mode returns to normal channel display and OST display 16 kinds of OST Tone pairs can be programmed in the Operator Selectable Tone window While in the OST Select mode the transceiver does not look back at the priority channel in the scan resume mode Queue Press Queue key to toggle Queue mode ON or OFF When it is ON you will see the contents of the Queue buffer You can scroll the ...

Page 7: ... List Select Mode It works as Status List mode If you press Selcall Status List key again it works as Status List Select Mode Shift It allows you to enable Shift Function key access When Shift key is pressed SFT appears on LCD Squelch Level Press Squelch Level key to enter Squelch Level Adjustment Mode The squelch level can be adjusted by the selector knob or 2 8 key Press Squelch Level key again ...

Page 8: ...ority channel 2 Make a selected channel a priority channel 6 Scan Type According to the Priority Channel 1 When no priority channel is set Only the non priority channels are scanned If a non priority channel stops temporarily it stops until there is no signal on the channel 2 When priority channel is set Either priority channel is scanned If a non priority channel stops temporarily a priority chan...

Page 9: ...eiver exits from scan mode 4 Details of Features 1 Time out timer The time out timer can be programmed off or in 30 seconds increments from 30 seconds to five minutes If the transmitter is keyed continuously for longer than the programmed time the transmitter is disabled and a warning tone sounds while the PTT button is held down The alert tone stops when the PTT button is released 2 Sub LCD displ...

Page 10: ... closed The receiver circuit power is toggled ON and OFF to prolong battery life except in Scan mode The ON time is automatically selected by the signal conditions The OFF time is selectable as OFF Short 200ms Med 400ms and Long 800ms 15 Auto Light on You can use the transceiver to turn on the backlight automatically when a key is pressed You can turn off the back light by pressing the Lamp key wh...

Page 11: ...ning of transmission and or the end of transmission to identify which radio unit is on air Selective Call SELCALL This is a voice call to a particular individual or group of stations Example of call types 100 ALL Group Call All the units whose fleet number is 100 are called 100 1000 Individual Call The unit whose the fleet number is 100 and ID number is 1000 is called ALL ALL Broadcast Call All th...

Page 12: ...Short message or PTT ID is outputed or not to serial port Parameters GTC Count Number of Go To data Channel messages to be sent before transmitting a data message if it is being made on Data Group Channel If a radio unit receives a GTC message it will move to the Data Group Channel of the current Group Increase this item to make sure the called radio unit moves to the Data Group Channel Random Acc...

Page 13: ...iver is not receiving the carrier When the transceiver is set up in Lockout 2 Do not transmit when the transceiver is receiving the carrier and QT DQT code does not match Transmit when the transceiver is not receiving the carrier or receiving the QT DQT code matches Selectable Receive Digit Select the check box to change Receive Code maximum 8 digits manually when receiving Decode Code You cannot ...

Page 14: ... Message when you receive the call Maximum 8 digit can be programmed for the Code and 100 different Selcalls or Status are available for Selcall Status List You can assign 16 alphanumeric characters to each message Programmable Alert Tone You can program the alert type from type 1 to type 8 when the expected 5 tone is received You can program the number of times to repeat outputting and frequency ...

Page 15: ...a DTMF code to memory and when changing test mode settings Key input error tone Sounds when a key is pressed but that key cannot be used Roll over tone Sounds at the smallest group channel Transpond tone Sounds when an individual call with the correct DTMF 2 tone option signalling is received For group calls only the group tone will sound not the transpond tone Pre alert tone Sounds prior to the T...

Page 16: ...install the KPG 60D for example to hard disk first then use it 5 5 Programming with IBM PC If data is transferred to the transceiver from an IBM PC with the KPG 60D the destination data basic radio information for each set can be modified Normally it is not necessary to modify the destination data because their values are determined automatically when the frequency range frequency type is set The ...

Page 17: ...ed How to enter the password with the encoder If the encoder is rotated while CLONE LOCK is displayed numbers 0 to 9 are displayed flashing When you press the D key the currently selected number is determined If you press the CALL key after entering the password in this procedure CLONE MODE is displayed if the entered password is correct If the password is incorrect CLONE LOCK is redisplayed 4 Pow...

Page 18: ...LOW Beat Shift SFT YES NO Wide Semi wide W N Wide Semi wide Narrow Narrow Compander CMP ON OFF R134 TX RX UNIT X57 6192 70 Foil Side Fig 3 8 Self Programming Mode Write mode for frequency data and signalling etc Mainly used by the person maintaining the user equipment 8 1 Enter to the self programming mode Delete R134 SELF Figure 3 in the TX RX unit and turn the power switch on while pressing the ...

Page 19: ...e display to ALL CLEAR Pressing A again returns the display to SELF PROG Pressing A when CLEAR NO is shown returns the display to SELF PROG without resetting the data MON Wide Semi wide Narrow C D MON Beat shift yes no C D MON RF Power High Low C D MON Scan delete add C D MON TX signalling C D MON TX frequency C D MON RX signalling C D MON RX frequency C MON Channel setting mode MON Self programmi...

Page 20: ...F amplifier Q24 and passed through the bandpass filter L31 33 and band eliminate filter L27 29 to remove the spurious signal again The resulting signal is applied to the first mixer IC18 where it is mixed with the first local oscillator signal output from the frequency synthesizer to produce the first IF 44 85MHz The 1st mixer uses the GaAs IC 3 2 IF unit The first IF signal is passed through a cr...

Page 21: ... signal is input to both amplifiers of IC300 When SP MIC is attached SSW is connected to GND at inside of SP MIC For this reason Q310 is turned OFF and the AF signal is input only to amplifier for EXT SP of IC300 Change of INT EXT SP refer to Fig 4 AM SSW VC1 VC2 SP H H H L INT H L L H EXT L H L L MUTE L L L L MUTE Fig 4 Audio amplifier circuit SW IC300 2 8 AM AF SSW INT SP EXT SP Q305 Q304 SB VP ...

Page 22: ...nt PLL data is output from DT pin 75 CP pin 19 and EP pin 47 of the microprocessor IC19 The data are input to the PLL IC when the channel is changed or when transmission is changed to reception and vice versa A PLL lock condition is always monitored by the pin 31 UL of the microprocessor When the PLL is unlocked the UL goes low CIRCUIT DESCRIPTION Fig 7 Microphone amplifier 12 HPF LPF HPF IDC PRE ...

Page 23: ...h memory has a capacity of 2M bits that contains the transceiver control program for the CPU and data such as transceiver channels and operating features This program can be easily written from an external devices Data such as operating status are programmed into the EEPROM IC20 Flash Memory Note The flash memory holds data such as written with the FPU KPG 60D firmware program User mode Test mode ...

Page 24: ...move a low speed data The CPU digitizes this signal performs processing such as DC restoration and decodes the signal FFSK The FFSK input signal from the IF IC is amplified by IC4 1 2 and goes to pin 5 of IC13 The signal is demodulated by FFSK demodulator in IC13 The demodulated data goes to the CPU for processing 7 Signalling Circuit 7 1 Encode Low speed data QT DQT Low speed data is output from ...

Page 25: ...depending on the type of option board being used Name Function SB Battery 7 5V GND Ground TXD Serial data RXD Serial data SQ Busy high LOK Link acquired low TX mode DI ANI Modulation ANI input DEO Detect output TXAI MUTE Modulation output from board or mic mute low TXAO Modulation input to board RXAI Received signal input to board RXAO Received signal output from board D1 Binary 1 D2 Binary 2 OPT ...

Page 26: ...t used 42 RD Flash memory RD bus 43 BHE Not used 44 WR Flash memory WR bus 45 DTMCLK O DTMF decode IC clock output 46 CNTCLK O Common clock output 47 PLLSTB O PLL IC data strobe output 48 CS0 O Flash memory chip enable 49 A19 Not used 50 59 A9 A18 Flash memory address bus 60 VCC 5V 61 A8 Flash memory address bus Pin Port I O Function No Name 62 VSS GND 63 70 A0 A7 Flash memory address bus 71 MONI ...

Page 27: ... KPG 60D 6 Q3 T R TX RX switching H RX L TX 7 Q4 DM Dead mute H RX L TX 8 VSS GND 9 NC 10 NC 11 Q8 SQ Squelch signal output Signal logic type can select Carrier Operate Relay or Tone Operate Relay in the KPG 60D Active logic level is Low 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 Please set option board type in the KPG 60D H...

Page 28: ...reset input 1 23 DIN I Data input Pin Port I O Function No Name Pin function 24 DCK I Data synchronized clock input 25 REGS1 I Internal register select input 1 26 REGS2 I Internal register select input 2 27 XOUT O Oscillation circuit output 28 XIN I Oscillation circuit input 29 FFSKE I FFSK modulation enable input 30 TRD O FFSK modulation data latch timing output 31 RTM O FFSK RX synchronized cloc...

Page 29: ...l from the DI is input to the 12 bit shift register 8 Dl I Serial data input Input serial data 12 bits long 9 VI3 I D A converter input Pin No Pin code I O Function Pin function 10 11 VO3 VO4 O 8 bit resolution D A 12 13 VI4 VI5 I D A converter input 14 15 VO5 VO6 O 8 bit resolution D A 16 VI6 I D A converter input 17 DO O 12 bit shift register MSB bit data is output 18 Vref Terminal for determini...

Page 30: ...to the charge pumps Auxiliary prescaler Auxiliary and Reference buffers 16 RN Main current setting resistor to VSSA 17 RF Fractional compensation current setting resistor to VSSA 18 LOCK Lock detector output 19 TEST Test pin connect to VDD 20 VDD Digital supply voltage This pin supplies power to the CMOS digital part of the device Pin No Symbol Description Pin description 1 NC Not connected 2 VC1 ...

Page 31: ...is pin is High When it is Low the normal count is carried out When the clock input pin No 14 is used as enable High active this input can be used for the count as the rising clock Output Q0 to Q9 pins 3 2 4 7 10 1 5 6 9 11 Decoded Decade Counter Output These outputs become High only during a single clock cycle CARRY OUT pin No 12 Cascade Output Pin This output is used as the cascade output or as t...

Page 32: ...se protection D2 Diode Overload protection D3 Diode Reverse current protection D4 Diode Noise detection D5 Diode RF switch 2nd IF wide narrow D6 Diode Current steering D7 Diode RF switch 2nd IF wide narrow D8 Diode Voltage clamp D9 Diode TX RX switch D10 Diode Overload protection D11 Diode Speed up D12 14 Diode ANT switch D16 17 Diode Varactor tuning D18 19 Diode Surge absorption D20 21 Diode Vara...

Page 33: ...1572 04 HOLDER 41 2B J21 8398 03 HARDWARE FIXTURE P MODULE 42 2C J29 0658 05 HOOK ACSY 43 3B J30 1263 04 SPACER TERMINAL 44 2A J30 1264 04 SPACER TERMINAL 45 3B J82 0045 05 FPC VOL ENC 46 3B J82 0066 05 FPC SQUARE SOCKET 47 1A K29 5157 03 KNOB PTT 48 1A K29 5158 03 KEY TOP PTT 49 1A K29 5165 03 LEVER KNOB 50 1B K29 5231 03 KNOB VOL 51 1B K29 5232 03 KNOB ENC A 3B N14 0569 04 CIRCULAR NUT VOL ENC B...

Page 34: ... TRANSISTOR Q308 UPA672T FET Q309 2SC4617 S TRANSISTOR Q310 2SK1824 FET TH300 TN10 3S154JT THERMISTOR X57 6192 70 TX RX UNIT C1 CK73GB1H102K CHIP C 1000PF K C2 3 CK73GB1E103K CHIP C 0 010UF K C4 6 CK73GB1H102K CHIP C 1000PF K C7 CK73GB1C104K CHIP C 0 10UF K C9 CK73GB1E103K CHIP C 0 010UF K C10 CK73GB1H102K CHIP C 1000PF K C11 CK73GB1E103K CHIP C 0 010UF K C12 CC73GCH1H101J CHIP C 100PF J C13 C92 0...

Page 35: ...015UF K C134 CK73GB1E103K CHIP C 0 010UF K C135 CK73GB1C333K CHIP C 0 033UF K C136 CK73GB1E103K CHIP C 0 010UF K C137 CC73GCH1H100D CHIP C 10PF D C138 CK73GB1H102K CHIP C 1000PF K C139 CC73GCH1H220J CHIP C 22PF J C140 C92 0592 05 CHIP TAN 4 7UF 6 3WV C141 CK73GB1H102K CHIP C 1000PF K C142 CC73GCH1H150J CHIP C 15PF J C143 C92 0714 05 TAN C 4 7UF 6 3WV C144 CK73FB1H563K CHIP C 0 056UF K C146 CK73HB1...

Page 36: ...E40 5823 05 FLAT CABLE CONNECTOR 10P CN2 E40 9517 05 PIN ASSY SOCKET 4P CN3 E40 5890 05 FLAT CABLE CONNECTOR 24P CN4 E23 0342 05 TEST TERMINAL CN5 12 E23 1081 05 TERMINAL F1 F53 0130 05 FUSE 3A CD1 L79 1072 05 TUNING COIL CF1 L72 0962 05 CERAMIC FILTER 455KHz CF2 L72 0963 05 CERAMIC FILTER 455KHz L1 L92 0149 05 FERRITE CHIP L2 L92 0138 05 FERRITE CHIP L3 L40 4791 37 SMALL FIXED INDUCTOR 4 7UH L4 L...

Page 37: ...IP R 33K D 1 16W R56 RK73GB1J472J CHIP R 4 7K J 1 16W R57 RK73GB1J183J CHIP R 18K J 1 16W R58 RK73GB1J184J CHIP R 180K J 1 16W R59 RK73GB1J564J CHIP R 560K J 1 16W R60 RK73GB1J123J CHIP R 12K J 1 16W R61 RK73GB1J103J CHIP R 10K J 1 16W R62 RN73GH1J913D CHIP R 91K D 1 16W R63 RK73GB1J474J CHIP R 470K J 1 16W R64 RK73GB1J153J CHIP R 15K J 1 16W R65 RK73GB1J103J CHIP R 10K J 1 16W R66 R92 1252 05 CHI...

Page 38: ...1J470J CHIP R 47 J 1 16W R276 RK73GB1J103J CHIP R 10K J 1 16W R281 RK73GB1J331J CHIP R 330 J 1 16W R282 283 RK73GB1J472J CHIP R 4 7K J 1 16W R284 R92 1252 05 CHIP R 0 OHM R294 RK73GB1J221J CHIP R 220 J 1 16W R295 R92 1252 05 CHIP R 0 OHM R296 297 RK73HB1J473J CHIP R 47K J 1 16W R298 R92 1252 05 CHIP R 0 OHM R300 R92 1252 05 CHIP R 0 OHM R303 305 R92 1252 05 CHIP R 0 OHM R306 RK73HB1J102J CHIP R 1 ...

Page 39: ...12PF J C7 CK73HB1C103K CHIP C 0 010UF K C9 CC73HCH1H0R5B CHIP C 0 5PF B C10 CK73HB1H102K CHIP C 1000PF K C11 CC73HCH1H070B CHIP C 7 0PF B C12 CC73HCH1H090B CHIP C 9 0PF B C13 CC73HCH1H070B CHIP C 7 0PF B C14 CC73HCH1H120J CHIP C 12PF J C15 CC73HCH1H0R5B CHIP C 0 5PF B C16 C92 0606 05 CHIP TAN 4 7UF 10WV C17 CC73HCH1H0R5B CHIP C 0 5PF B C18 CK73HB1C103K CHIP C 0 010UF K C19 CK73HB1H102K CHIP C 1000...

Page 40: ... 19 Sub unit TX RX unit 54 11 24 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 E N79 2025 46 F M2x5 N83 2005 46 Fx2 Fx2 Fx2 Bx2 27 MIC F F F F F F 17 56 21 55 53 45 8 23 15 32 10 E 35 12 C C E 10 32 28 36 7 14 46 33 2 A A 31 S NO label S NO label ESN 701 CHASSIS Display unit B 2 29 F D D 41 IC100 44 43 ...

Page 41: ...na T90 0680 05 T T90 0695 15 E 6 Instrution mamual B62 1266 00 3 Cap B09 0363 03 52 Screw set N99 2004 05 42 Hook J29 0658 05 UPC code label 39 Item carton case H52 1225 12 37 Packing fixture H12 3014 02 38 Carton board H13 1072 04 S NO label ESN ...

Page 42: ...ammeter equipped The following parts are required for adjustment 1 Antenna connector adapter The antenna connector of this radio uses an SMA terminal Use an antenna connector adapter SMA f BNC f or SMA f N f for adjustment The adapter is not provided as an option so buy a commercially available one Note When the antenna connector adapter touches the knob draw out the knob to mount the connector 2 ...

Page 43: ...ng PC tuning Connect the wires to the PCB in the connector case of interface cable For output the wires out of the connector case need to process the connector case 11 GREEN 5M TUBE SCREW 8 YELLOW PF SW 2 RED RX AF OUTPUT 3 BLACK RX AF OUTPUT 10 BROWN GND 6 BROWN MIC GND 5 WHITE MIC INPUT 7 BLUE PTT SW GND ON RED 2 BLK 3 100µ 10V 100µ 10V 16Ω WHT 5 BRN 6 BLU 7 BRN 10 PTT SW To Radio AF Voltmeter A...

Page 44: ...ts during transmission Blinks at the low battery voltage warning Green LED Lights when there is a carrier Sub LCD indicator SFT appears at Shift ON Frequency and signalling The set has been adjusted for the frequencies shown in the following table When required re adjust them following the adjustment procedure to obtain the frequencies you want in actual operation Frequency MHz Channel No E T RX M...

Page 45: ...iation Narrow 3 point tuning 3 point tuning 3 point tuning HPOW xxx s BAL xxx w BAL xxx D CALL B B LPOW xxx n SQLT xxx n HRSI xxx BATT xxx n LRSI xxx B B B B B B B n SQL xxx s MAX xxx w MAX xxx s QT xxx w QT xxx s DQT xxx w DQT xxx s DTMF xxx w DTMF xxx s FFSK xxx w FFSK xxx s TONE xxx w TONE xxx s SQL xxx w SQL xxx Squelch Level RSSI Low Level Squelch Tight Level RSSI High Level s LRSI xxx w LRSI...

Page 46: ...1 Frequency 1 Adj item FREQ Power meter Panel ANT Panel Encoder Center frequency Adjust Adjust Am meter knob 100Hz PTT ON Note After replacing the TCXO X1 align using KPG 60D 2 Max Power 1 Adj item HPOW Check 5 2W or more Check Adjust 256 L H CH 4 9W 2 Adj item L HPOW L2 HPOW C HPOW H2 HPOW H HPOW Adjust 256 PTT ON 3 Hight Power 1 Adj item HPOW Encoder 5 0W 0 1W Adjust Adjust knob L H CH 2 2A or l...

Page 47: ... BAL Adjust PTT ON 8 Max DEV 1 Adj item n MAX 1 85kHz 50Hz Adjust Adjust According to Narrow AG 1kHz 150mV the larger Dev meter filter LPF 15kHz HPF OFF 2 Adj item nL MAX nC MAX nH MAX Adjust PTT ON Semi wide 3 Adj item s MAX 3 4kHz 50Hz Adjust According to PTT ON the larger Wide 4 Adj item w MAX 4 20kHz 50Hz Adjust According to PTT ON the larger 9 MIC Panel Test Mode Check 1 2 2 0kHz Sensitivity ...

Page 48: ...kHz Adjust PTT ON Wide 4 Adj item DQT 0 75kHz 50kHz Adjust PTT ON 12 DTMF 1 Adj item n DTMF 1 4kHz 0 1kHz Deviation Adjust Adjust LPF 15kHz Narrow HPF OFF PTT ON Semi wide 2 Adj item s DTMF 2 4kHz 0 1kHz Adjust PTT ON Wide 3 Adj item w DTMF 3 0kHz 0 1kHz Adjust PTT ON 13 MSK 1 Adj item n FFSK 1 4kHz 0 1kHz Deviation Adjust Adjust LPF 15kHz Narrow HPF OFF PTT ON Semi wide 2 Adj item s FFSK 2 4kHz 0...

Page 49: ...Check No blinking of LED Detection 1 CH Sig 1 1 Check BATT terminal voltage 6 5V PTT ON 2 BATT terminal voltage 5 7V Blinking of LED PTT ON Receiver Section Panel Tuning Mode except when Panel TEST Mode is specified Item Condition Measurement Adjustment Specifications Test equipment Unit Terminal Unit Parts Method Remark 1 Sensitivity 1 Adj item SENS SSG Panel ANT Panel Encoder Adjust for 14dB SIN...

Page 50: ...AD level 4 Adj item sL SQL sC SQL sH SQL Adjust Wide 5 Adj item w SQL Adjust 12dB SINAD level 6 Adj item wL SQL wC SQL wH SQL Adjust 4 RSSI 1 Adj item n LRSI After input Low Adjust signal from Adjust SSG OUT SSG press Narrow 12dB SINAD level D key 2 Adj item That nL LRSI nC LRSI nH LRSI numeric will Adjust be stored Semi wide 3 Adj item s LRSI in memory Adjust 12dB SINAD level 4 Adj item sL LRSI s...

Page 51: ...D LEVEL 4dB Narrow 2 Adj item AF VTVM Universal Oscilloscope Connector nL SQLT nC SQLT nH SQLT Adjust Semi wide 3 Adj item sL SQLT sC SQLT sH SQLT Adjust Wide 4 Adj item wL SQLT wC SQLT wH SQLT Adjust 7 RSSI 1 Adj item n HRSI After input High Adjust signal from Adjust SSG OUT SSG press 70dBm 70 7µV D key Narrow 2 Adj item That nL HRSI nC HRSI nH HRSI numeric will Adjust be stored Semi wide 3 Adj i...

Page 52: ...rmally 0V lighting 5V 6 LR I TX LED control Normally 0V lighting 5V 7 AUX O AUX key output CN No Pin No Name I O Function DISPLAY UNIT X54 3210 12 A 2 DISPLAY section TX RX UNIT X57 6192 70 TX RX section 8 PTT O PTT signal output 9 NC Not use 10 CS I LCD driver chip select input 11 AM I Audio mute signal input Mute L Unmute H 12 5M I 5V 13 GND GND 14 KI2 O KEY output 15 KI1 O KEY output 16 KRS I K...

Page 53: ...attern 3 Pattern 4 DISPLAY UNIT X54 3210 12 PC BOARD VIEW S301 MON S302 PTT S303 LAMP CN302 C329 C330 D305 D306 C 3 2 1 6 5 4 9 8 7 0 B A S D307 D308 D309 D310 C337 C338 MIC LCD ASSY X54 3210 12 A 2 J72 0517 22 X54 3210 12 B 2 J72 0517 22 C317 C316 SP 1 SP 2 C336 D301 o N f e R s s e r d d A 1 0 3 D C 9 5 0 3 D L 8 6 0 3 D L 6 7 0 3 D N 8 8 0 3 D N 6 9 0 3 D Q 8 0 1 3 D Q 6 ...

Page 54: ... C325 C326 C327 C328 C331 C332 NC RXD TXD 5M E NC PF PTT ME EMC NC LEDK LEDA VCI SOD SID SCLK CS VCC GND MSW SP SP SSW CP302 CP303 D300 L302 L303 R332 R326 R327 R328 R333 TH300 C321 L304 L305 C313 Q309 R301 MSW C339 Q310 R337 D315 D318 C312 S300 C304 L306 L307 C307 D303 R338 R339 C340 D320 R340 PTT R341 D319 R336 D321 C333 C344 L308 L309 C343 C342 C341 IC301 C311 C335 CN301 1 14 SB MIC ME LBL LG L...

Page 55: ...2 R326 R327 R328 R333 TH300 C321 L304 L305 C313 Q309 R301 MSW C339 Q310 R337 D315 D318 C312 S300 C304 L306 L307 C307 D303 R338 R339 C340 D320 R340 PTT R341 D319 R336 D321 C333 C344 L308 L309 C343 C342 C341 IC301 C311 C335 CN301 1 14 SB MIC ME LBL LG LR AUX PTT NC CS AM 5M GND K12 K11 KRS DT TXD RXD CK PF NC AE AF S301 MON S302 PTT S303 LAMP CN302 C329 C330 D305 D306 C 3 2 1 6 5 4 9 8 7 0 B A S D30...

Page 56: ...CO X58 458 R267 R271 L17 L15 R167 C172 C168 C160 C169 C179 C157 R127 X1 5C C208 C200 TP C199 C198 IC2 R10 1 12 24 13 C404 R5 R9 R24 R8 C7 Q5 Q9 D24 C34 R37 C9 R17 C16 C18 L38 C243 C223 C237 C224 C2 C233 C217 L39 C244 C247 D12 D401 C207 C209 C221 L45 R298 D14 D22 C3 C4 1 10 B B SB SB 5M VOL E EN2 E EN1 R1 C205 R202 C186 R195 C180 R177 C177 L19 C175 R249 C52 R258 CN1 CN4 Q13 Q14 C13 1 4 8 5 1 4 8 5 ...

Page 57: ...60 R118 C259 L407 L14 C261 L408 R122 C95 C108 D23 L26 L25 C78 L6 L11 C55 CP1 D6 C47 L10 R294 L9 C132 C80 R101 R119 R402 C402 C401 C403 C141 R403 R401 Q3 R283 R406 C112 Q1 Q2 R284 C197 C122 X2 C111 Q25 Q21 C125 Q18 C40 C22 R192 C246 C220 L34 R253 R257 C227 C242 ANT C189 C192 R413 C204 C218 C143 R114 C146 CN1 CN2 CV MOD TR OUT GND VCC R295 Q22 L24 IC21 IC20 1 4 8 5 IC22 1 8 16 9 1 8 16 9 CP22 L49 C2...

Page 58: ...5 5R CN6 CN7 CN12 CN8 CN9 R25 C79 R123 Q10 C195 R239 L8 R259 R11 D402 5M R34 R21 R22 R33 R416 R32 R28 R29 R36 R40 R41 R68 R110 R415 R106 R414 GND MONI LAMP DEO D2 OPT LOK RXEMAI RXD AUXRXD EXT SW SB SQ D1 5CNS AAC RXEMAO TXD AUXTXD AUDIOBEEP R3 R23 R13 R12 R2 R4 R7 R6 R155 R14 R26 C49 CV C10 C11 C101 C54 C35 C42 C45 C117 C123 DI9 RXAO RXAI PTTOUT RSSI TXAO PTTIN TXAI MUTE DI ANI C124 C138 C20 C38 ...

Page 59: ... F G I H J K L M O N P Q S R 1 2 3 4 5 6 7 TK 280 SCHEMATIC DIAGRAM Note Component marked with a dot are parts of pattern1 SVC MON SCNLO Table on the left indicates the parts used among different serial numbers ...

Page 60: ... 129 4dBm 107 8dBm 108 8dBm 106 7dBm 113 0dBm 107 1dBm 283mVrms 269mVrms XF1 C112 Q12 C95 IC4 AF0 5 4 3 41 IC13 IC8 DAC 500mW BTL SP IC300 209mVrms 489mVrms 151mVrms 22 7mVrms IC8 DAC 12 13 ALC COMP SW IDC 6 9 8 19 18 15 16 C101 6 86mVrms 12 4mVrms 33 2mVrms 302mVrms 291mVrms 282mVrms 429mVrms 138mVrms MIC IC13 IC7 Q20 15 7dBm C192 L22 C210 RF CENTER FREQUENCY IF1 44 85MHz IF2 455kHz AF 1kHz IC7 C...

Page 61: ...MC 25 SPEAKER MICROHONE 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 External View ...

Page 62: ...e Narrow Less than 3 3 Frequency Stability 0 00025 30 C to 60 C Channel Spread 28MHz E T SPECIFICATIONS KENWOOD CORPORATION 14 6 Dogenzaka 1 chome Shibuya ku Tokyo 150 8501 Japan KENWOOD SERVICE CORPORATION P O BOX 22745 2201 East Dominguez Street Long Beach CA 90801 5745 U S A KENWOOD ELECTRONICS CANADA INC 6070 Kestrel Road Mississauga Ontario Canada L5T 1S8 KENWOOD ELECTRONICS DEUTSCHLAND GMBH ...

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Kenwood TK-280, Service Manual

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