Kenwood FM Transceiver TK-481 Service Manual Download

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TK-480/481

LEVEL DIAGRAM (TK-480)

RX Section

VCO

IC14

C131

PLL

Q10

C136

Q17

C193

Q11

C149

Q12

C152

Power

module

C169

L30

ANT

2.5W

–11.7dBm

(Q10 open)

–7.8dBm

(Q17 open)

–1.9dBm

(D5 open)

+7.1dBm

(Q12 open)

+17.5dBm

(C152 open)

RF (815.50MHz)

EMC

MIC

LPF

ALC

COMP

IDC

DAC

IC12

16.6mV

rms

17.2mV

rms

39.2mV

rms

331mV

rms

320mV

rms

310mV

rms

IC4

IC3 (1/2)

IC4

487mV

rms

179mV

rms

311mV

rms

154mV

rms

DAC

IC12

C58

IC3

IC4

AMP

IC300

500mW

(BTL)

203mV

rms

287mV

rms

419mV

rms

135mV

rms

29mV

rms

C169

L30

ANT

C143

L11

C139

C122

L20

C110

R60

XF1

R51

C55

FM IF

SYSTEM

CF1,2

IC8

AMP

–118.0dBm

–119.0dBm

–119.4dBm

–120.4dBm

–107.0dBm

–110.3dBm

–106.8dBm

–116.4dBm

–109.6dBm

(C55 open)

241mV

rms

265mV

rms

–79.2dBm

–80.2dBm

RF (860.50MHz)

IF1 (44.85MHz)

IF2

(455kHz)

make measurements in the AF section,

connect the oscilloscope proves directly.

(ANT input : –47dBm, 1kHz FM, 3kHz dev

In the RF section, use a 1000pF coupling capacitor

(The display shows the SSG input value required

to obtain 12dB SINAD.)

AG is set to the MIC input

becomes 3kHz Dev at 1kHz MOD.

make measurements in the

AF section, connect the

oscilloscope proves directly.

In the RF section, use a 1000pF

coupling capacitor

TX Section

Summary of Contents for FM Transceiver TK-481

Page 1: ...ing or otherwise for any purpose without the prior written permission of Kenwood 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 the right to make changes to any products herein at any t...

Page 2: ...M 57 LEVEL DIAGRAM TK 480 59 LEVEL DIAGRAM TK 481 60 KNB 16A 17A Ni Cd BATTERY 61 KPG 36 PROGRAMMING INTERFACE CABLE 61 KSC 19 CHARGER 61 SPECIFICATIONS 62 CAUTION When using an external power connector please use with maximum final module pro tection of 9V CONTENTS REVISED II Photo is TK 480 481 K2 type Produced in Singapore This service manual applies to products with 30100001 or subsequent seri...

Page 3: ...ocedures contained within NOTE WE CANNOT guarantee oscillator stability when using channel elements manufactured by companies other than KENWOOD or its authorized agents You must use the KPG 49D to program TK 480 481 trans ceivers with a serial number of 30100001 or greater You cannot use the KPG 35D for those radios TK 480 481 transceivers with a serial number of 30100001 or greater have a red tr...

Page 4: ...hed off all the param eters such as the system and group are stored in memory When the power is switched on again the sys tem returns to the previous conditions Auxiliary orange key Programmable Battery pack release catch Push down to release the battery pack See Installing the Ni Cd Battery Pack MONITOR key Programmable PTT Push To Talk key Press this key then speak into the microphone to call a ...

Page 5: ...s pressed each time the group number to be selected is incremented decremented and repeats if held for one second or longer Home group Each pressing of the key selects a preset system group Key lock Pressing this key causes the transceiver to accept entry of only the Function Key Lock PTT Lamp Monitor A Monitor B Monitor C Monitor D and Emergency keys The locked keys also include the tuning contro...

Page 6: ...ogrammable key it can be controlled from the front panel List type system scan A scan list can be set for each system The list to be scanned can be changed by changing the display system If many system have been set the scan speed can be increased by narrowing the systems to be scanned with scan lists 3 2 System lockout The system lockout feature is used to lock systems out of the scan sequence an...

Page 7: ...f the selected group the ID codes of the other groups that are permitted for group scan are de coded The two fixed ID and block decode codes are always decoded If during group scanning a call is received with one of the selectable group ID codes for which group scan is en abled the group display indicates the group number that the call came in with That group then becomes the new se lected group G...

Page 8: ...ercept tone sounds the mode is terminated and the transceiver returns to the first system If the access is successful the mode is terminated and the searched system becomes the new se lected system If during scanning the scan stops 4 11 Transpond This feature can be programmed to turn on and off for each group If the ID of the group for which transpond is enabled is received two data messages tran...

Page 9: ... MSK FleetSync Fleet ID decoder is available for option signalling When the group ID matches squelch remains muted while the station waits for reception of proper MSK signal When MSK signal matches squelch unmutes AND OR AND QT DQT ID MSK to unmute MSK matches alert tone OR QT DQT ID to unmute MSK matches alert tone 6 Alphanumeric Two way Paging Function FleetSync 6 1 General The Alphanumeric Two ...

Page 10: ...to reception of status 99 which is used as an emer gency status 6 9 Other Functions Manual Dial Fleet ID and Status numbers can be entered from DTMF keypad DTMF microphopne is required FleetSync Baud Rate MSK data baud rate setting The same rate must be set as a communication partner 1200bps Data communication is made in 1200bps The communi cation area is much wider than 2400bps Recommended for re...

Page 11: ...utput until the PTT button is released The 697Hz tone is output 7 3 DBD On Tone When a D B D code is received transpond tone sounds 7 4 DBD Off Tone When a D B D release code is received transpond tone sounds 7 5 Password Agreement Tone When the correct password is entered the tone sounds The optional feature s control tone can be set to yes or no 7 6 PTT Release Tone When you release the PTT swit...

Page 12: ...for 400ms 7 22 Ringing Tone This tone indicates that the transceiver can use the re peater in free system ringback mode The mid tone and no tone are output eight cycles alternately in 50ms intervals 7 23 System Search Tone Sounds when the system changes during system search You can select yes or no for the optional feature s warning tone 7 24 System Search End Tone Sounds when a possible connectio...

Page 13: ... destination data because their values are determined automatically when the frequency range fre quency type is set The values should be modified only if necessary Data can be programmed into the flash memory in RS 232C for mat via the universal connector KPG 49D instruction manual parts No B62 1096 XX Fig 1 KPG 36 IBM PC KPG 49D 6 Firmware Programming Mode 6 1 Preface Flash memory is mounted on t...

Page 14: ...not set the TK 480 481 displays CLONE MODE 2 When CLONE LOCK is displayed only the knob en coder and S and 0 to 9 keys can be accepted When you enter the correct password and CLONE MODE is displayed the TK 480 481 can be used as the cloning master The following describes how to enter the pass word 3 How to enter the password with the keypad If you press a key while CLONE LOCK is displayed The numb...

Page 15: ...lter L11 The signal is ampli fied by RF amplifier Q9 and passed through the bandpass filter L20 to remove the spurious signal again The result ing signal is applied to the first mixer Q6 where it is mixed with the first local oscillator signal output from the fre quency synthesizer to produce the first IF 44 85MHz 3 2 IF unit The first IF signal is passed through a four pole mono lithic crystal fi...

Page 16: ...r to Fig 3 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 3 Audio amplifier circuit SW 2 VC1 8 VC2 5 VP Q305 Q304 IC300 INT SP EXT SP Q301 Q308 AF AM SSW SB 3 4 Squelch circuit The output from IC9 enters FM IC again then passed through a band pass filter The noise component output from IC9 is amplified by Q19 and rectified by D3 to produce a DC voltage corresponding to the...

Page 17: ...o the VCO modulation input The other output signal from the summing amplifier passes through the D A converter IC4 again for the BAL adjustment and the buffer amplifier IC1 2 2 and goes to the VCXO modulation input 4 2 Drive and Final amplifier The signal from the T R switch D5 is on is amplified by the pre drive Q11 and drive amplifier Q12 to 50mW The output of the drive amplifier is amplified by...

Page 18: ...generates 16 8MHz The frequency stability is 1 5ppm within the temperature range of 30 to 60 C The frequency tuning and modulation of the VCXO are done to apply a voltage to pin 1 of the VCXO The output of the VCXO is applied to pin 8 of the PLL IC The TK 480 s VCO covers a dual range of the 806 825MHz and the 851 870MHz The VCO generates 806 15 825 15MHz for providing to the first local signal in...

Page 19: ...signal passes through a low pass CR filter and goes to the summing amplifier IC3 1 2 The signal is mixed with the audio signal and goes to the VCO IC14 and VCXO X2 modulation input after passing through the D A converter IC4 for BAL adjustment High speed data DTMF High speed data is output from pin 35 of the CPU The signal passes through a low pass filter consisting of IC23 and provides a TX DTMF ...

Page 20: ...ow and Q2 is turned ON to supply 5V 5T to the TX circuit During reception 5RC becomes Low and Q1 is turned ON to supply 5V 5R to the RX circuit Fig 14 Power supply circuit 9 Optional Board Terminal Terminals for mounting the option board are provided at the bottom edge of the TX RX unit The table below shows the correspondence between the board and terminals R422 R32 R250 R259 R147 R276 R421 may h...

Page 21: ...ulation enable Enable active H 33 TXD O Serial interface output ex PC 34 RXD I Serial interface input ex PC 35 AFDAT O MSK data output 36 PTT I PTT switch input 37 RDY Not used 38 ALE Not used Pin No Port name I O Function 39 HOLD Not used 40 HLDA Not used 41 BLCK Not 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...

Page 22: ...8 R2 L2 R4 D2 D3 C1 Q2 Q3 C12 D1 C13 C4 C5 R6 R3 C15 4 OUT 5 GND R7 C9 C10 C11 6 5C R5 R8 L4 R9 L3 Q1 R1 C17 Q1 2SK1824 Q2 2SC4226 R25 Q3 2SC5008 D1 HVC350B D2 HVC202A D3 MA2S077 C14 C16 C7 C6 C3 Shift Register 2 BU4094BCFV TX RX Unit IC19 Pin No Port Port name Function 1 STRB ES Strobe 2 DATA DAT Data 3 CLK CK Clock 4 Q1 AM1 Audio mute 1 H Unmute L Mute 5 Q2 LOK Link complete Programmable active ...

Page 23: ...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 CLOCK DATA STROBE 64 65 72 Prescaler Main dividers PR NM1 NM2 NM3 1...

Page 24: ...T DC switch 5R Q2 Transistor DC switch 5T Q3 Transistor Ripple filter 5CV Q4 Transistor TX RX switch Q5 Transistor IF amplifier Q6 FET Mixer Q7 FET Mute switch MIC line mute Q8 Transistor RF amplifier Q9 FET RF amplifier Q10 Transistor Buffer amplifier Q11 12 Transistor RF amplifier TX driver Q13 FET DC switch Q14 15 Transistor DC switch Q16 Transistor AF mute switch Q17 Transistor RF amplifier Q1...

Page 25: ...046 05 FPC SOCKET 38 1B K29 5157 03 KNOB PTT 39 1B K29 5158 03 KEY TOP PTT 40 1A K29 5165 03 LEVER KNOB 36 1B K29 5231 03 KNOB VOL 37 1B K29 5232 03 KNOB ENC A 2B N14 0569 04 CIRCULAR NUT VOL ENC B 3B N30 2605 46 PAN HEAD MACHINE SCREW ANT C 3A N30 2610 46 PAN HEAD MACHINE SCREW CASE D 2A N67 2606 46 PAN HEAD SEMS SCREW W P MODULE F 3A N79 2025 46 PAN HEAD TAPTITE SCREW TERMINAL E 2A 1B N83 2005 4...

Page 26: ...IP TAN 4 7UF 6 3WV C7 CC73GCH1H101J CHIP C 100PF J C8 CK73GB1E223K CHIP C 0 022UF K C9 CK73GB1C104K CHIP C 0 10UF K C10 C92 0507 05 CHIP TAN 4 7UF 6 3WV C11 CK73GB1C104K CHIP C 0 10UF K C12 13 C92 0507 05 CHIP TAN 4 7UF 6 3WV C14 C92 0576 05 CHIP TAN 1 0UF 6 3WV C15 CC73GCH1H100D CHIP C 10PF D C16 17 CC73GCH1H101J CHIP C 100PF J C18 CK73GB1C104K CHIP C 0 10UF K C19 23 CC73GCH1H101J CHIP C 100PF J ...

Page 27: ...C135 CC73GCH1H101J CHIP C 100PF J C136 CC73GCH1H030C CHIP C 3 0PF C C137 CC73GCH1H101J CHIP C 100PF J C138 CK73GB1E103K CHIP C 0 010UF K C139 CC73GCH1H030C CHIP C 3 0PF C A K K2 C139 CC73GCH1H020C CHIP C 2 0PF C B K K2 C140 CK73FB1A105K CHIP C 1 0UF K C141 CK73GB1H472K CHIP C 4700PF K C142 143 CC73GCH1H101J CHIP C 100PF J C144 CK73GB1C273K CHIP C 0 027UF K C145 146 CC73GCH1H101J CHIP C 100PF J C14...

Page 28: ...SONATOR 3 579545MHZ X4 L78 0462 05 RESONATOR 9 8304MHZ XF1 L71 0501 05 MCF 44 85MHZ A K K2 XF1 L71 0502 05 MCF 44 85MHZ B K K2 CP1 R90 0718 05 MULTI COMP 4 7K X4 CP3 R90 0743 05 MULTIPLE RESISTOR CP5 R90 0743 05 MULTIPLE RESISTOR CP6 21 R90 0741 05 MULTIPLE RESISTOR CP22 R90 0743 05 MULTIPLE RESISTOR CP24 R90 0743 05 MULTIPLE RESISTOR R1 2 RK73GB1J104J CHIP R 100K J 1 16W R3 RK73GB1J473J CHIP R 47...

Page 29: ...W R110 RK73GB1J473J CHIP R 47K J 1 16W R111 RK73GB1J223J CHIP R 22K J 1 16W R112 RK73GB1J103J CHIP R 10K J 1 16W R113 RK73GB1J101J CHIP R 100 J 1 16W A K K2 R113 RK73GB1J220J CHIP R 22 J 1 16W B K K2 R114 RK73GB1J152J CHIP R 1 5K J 1 16W R115 RK73GB1J681J CHIP R 680 J 1 16W R116 R92 1368 05 CHIP R 0 OHM R117 RK73GB1J470J CHIP R 47 J 1 16W R118 R92 1252 05 CHIP R 0 OHM R120 RK73HB1J102J CHIP R 1 0K...

Page 30: ...TEM A K K2 IC14 KCH32 HIC VCO SYSTEM B K K2 IC15 30622M8A 4F9GP IC MICROPROCESSOR IC16 AT2408N10SI2 5 IC EEPROM IC17 AT29C020 90TI IC AND GATE IC17 W29C020C90 IC AND GATE IC18 19 BU4094BCFV IC SHIFT REGISTER IC21 NJM2904V IC COMPARATOR IC23 TA75S01F IC ACTIVE FILTER IC30 M68757L IC POWER MODULE A K K2 IC30 M68757H IC POWER MODULE B K K2 Q1 2SJ243 FET Q2 2SA1832 GR TRANSISTOR Q3 4 2SC4617 S TRANSIS...

Page 31: ...1 52 64 64 66 10 61 12 65 49 44 2 26 34 24 17 19 40 31 25 MIC300 46 18 22x2 21x2 A C C A Ex2 Display unit A 2 Ex2 Ex2 F F 701 Chassis S No label E E 703 E D D E E E E Bx2 TX RX unit Display unit B 2 When you repair or exchange the square socket 19 please exchange FPC 34 as well When you repair or exchange the display unit please exchange the sheet 24 as well Parts with the exploded numbers larger ...

Page 32: ...et 28 Packing fixture H12 3014 02 47 Whip antenna T90 0636 25 TK 480 T90 0640 25 TK 481 29 Item carton case H52 1096 12 TK 480 H52 1097 12 TK 481 7 Warranty card B46 0470 00 9 Instruction manual B62 1483 00 4 Cap SP MIC B09 0363 03 42 Screw set N99 2004 05 32 Hook J29 0658 05 ...

Page 33: ...er Supply 5V to 10V approx 5A Useful if ammeter requipped The following parts are required for adjustment 1 Antenna connector adapter The antenna connector of this radio uses an SMA termi nal 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 d...

Page 34: ...er or tweezers CN1 CN3 CN304 Tweezers Lever Flat cable Power module Jig TX RX unit 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 G...

Page 35: ... LED indicator Red LED Lights during transmission Blinks at the low battery voltage warning Green LED Lights when there is a carrier Sub LCD indicator FCN Appears at Function 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 Fre...

Page 36: ...MAX H NMAX C C C A A IC30 IC14 VC 1 1 Group No System No Transceiver tuning To place transceiver in tuning mode System appears on LCD Set system according to tuning requirements LCD display Test mode Press S now in tuning mode Use B button to write tuning data through tuning modes and channel selector knob to adjust tuning requirements 1 to 256 appears on LCD Use C button to select the adjustment ...

Page 37: ... SYS GRP 1 7 Check 2 0 3 0W power check TA mode OFF and ON Press A key then C key 1 7A or less PTT ON 6 TX low 1 SYS GRP 4 Panel Encoder 1 0W 0 1W power Select LPW knob 1 2A or less adjustment in tuning mode PTT ON 7 TX T A 1 SYS GRP 4 low power Select TLPW adjustment in tuning mode PTT ON 8 TX low 1 SYS GRP 1 7 Check 0 5 1 5W power check Low power Press B key 1 2A or less TA mode OFF and ON Press...

Page 38: ...ment item L MAX C MAX H MAX PTT ON 11 T A MAX 1 SYS GRP 4 DEV Select TMAX adjustment in tuning mode AG 1kHz 150mV Deviation meter filter setting LPF 15kHz HPF OFF Adjustment item L TMAX C TMAX H TMAX PTT ON 12 NPSPAC 1 SYS GRP 10 TK 480 2 9kHz 50Hz MAX DEV Select NMAX According to the adjustment in tuning mode larger AG 1kHz 150mV Deviation meter filter setting LPF 15kHz HPF OFF Adjustment item L ...

Page 39: ...LTR TK 481 0 75kHz 0 05kHz TK 481 in tuning mode Deviation meter filter setting LPF 3kHz HPF OFF PTT ON 18 DTMF DEV 1 SYS GRP 4 TK 480 3 00kHz 0 15kHz TK 480 adjustment Select DTMF TK 481 1 50kHz 0 10kHz TK 481 in tuning mode Deviation meter filter setting LPF 15kHz HPF OFF PTT ON 19 MSK DEV 1 SYS GRP 4 adjustment Select FMSK in tuning mode Deviation meter filter setting LPF 15kHz HPF OFF PTT ON 2...

Page 40: ...NAD level See Note 2 SSG output OFF Squelch must be closed Note When squelch is adjusted the microcomputer simultaneously reads and writes the RSSI level Do not write adjustment values without the SSG connected Measurement Test equipment Unit Terminal Adjustment Unit Parts Method Specifications Remarks Condition Item Receiver Section 22 BATT 1 SYS GRP 4 1 Power meter Panel ANT Panel Encoder Check ...

Page 41: ...LBL I Backlight LED control TX RX Normally 0V lighting 5V unit 5 LG I RX LED control Normally 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 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 KR...

Page 42: ...16 C317 CN302 1 2 SP SP LCD ASSY C 3 6 9 D310 D308 0 8 5 2 B D306 D305 A D307 D309 7 4 1 S MIC300 D301 J72 0517 22 41 42 DISPLAY UNIT X54 3210 XX 10 K 11 K2 Component side view Component side Foil side Pattern 1 Pattern 2 Pattern 3 Pattern 4 Ref No Address D301 10A D305 9K D306 6K D307 9N D308 7N D309 9Q D310 7Q PC BOARD VIEWS TK 480 481 ...

Page 43: ...4 CN303 1 4 MON LAMP PTT GND J72 0517 22 J72 0517 22 GND CS SID VCI LEDK VCC SCLK SOD LEDA NC CN304 1 10 CS R337 C323 C324 C325 C322 C315 MIC MIC D319 R301 C339 R339 C332 R312 R311 L309 L308 MSW D300 R340 R341 PTT R338 C331 C328 CN301 1 14 SP MSW ME PF E TXD NC SSW SP EMC PTT NC 5M RXD R300 R302 D321 R303 R304 R305 Q300 C326 C335 C327 EMC SSW ME C302 C301 AUX S300 Q303 Q302 R310 C305 R307 TK 480 4...

Page 44: ...339 R339 C332 R312 R311 L309 L308 MSW D300 R340 R341 PTT R338 C331 C328 CN301 1 14 SP MSW ME PF E TXD NC SSW SP EMC PTT NC 5M RXD R300 R302 D321 R303 R304 R305 Q300 C326 C335 C327 EMC SSW ME C302 C301 AUX S300 Q303 Q302 R310 C305 R307 C338 S301 MON S302 PTT S303 LAMP J72 0517 22 C330 C337 C329 C336 C316 C317 CN302 1 2 SP SP LCD ASSY C 3 6 9 D310 D308 0 8 5 2 B D306 D305 A D307 D309 7 4 1 S MIC300 ...

Page 45: ...IC14 1 3 4 6 IC10 IC4 C6 IC1 R88 C120 C191 C200 C201 MON LAMP PTT GND C11 Q7 Q22 D D G G S S C109 C10 C263 1 4 4 5 8 1 IC8 4 5 8 1 5 8 IC3 CN3 F1 CN10 R25 R23 C62 R49 C55 XF1 L20 L11 L25 C160 C173 C174 C40 C166 IC30 1 2 3 4 D7 L30 L31 L29 CN1 R2 R1 R17 C4 C12 IC5 R103 D2 O G I 1 10 EN1 E EN2 E VOL 5M SB SB B B 1 24 SB MIC ME LBL LG LR AUX PTT NC CS AM 5M GND KI2 KI1 KRS DT TXD RXD CK PF NC AFE AF ...

Page 46: ...C132 C139 C129 Q15 Q18 IC21 1 4 5 8 D G S D G S D G S D G S D G S Q2 Q 11 Q1 Q9 Q20 Q17 Q10 L19 L14 L15 R76 D S G1 G2 S D G2 G1 R60 R27 Q12 E C B L21 L34 L10 R38 R83 R75 R78 R69 R70 R42 R159 R166 R43 R39 R90 R79 R92 R95 R72 R68 C177 C182 C181 C130 C119 C184 C128 C57 L8 L5 L12 D12 L13 C14 CN6 C35 C48 C49 C45 C32 C39 C54 R41 C51 R18 R29 R34 R19 R33 IC9 Q19 1 8 9 16 L3 X1 IC13 1 7 8 14 X3 C124 C113 C...

Page 47: ...P11 CP14 CP15 IC19 1 8 9 16 IC18 IC16 1 1 8 8 9 4 5 16 CN8 R77 R35 R53 R46 R45 R47 R48 R50 R63 R74 R84 R82 R120 R211 R149 R218 CP3 CP5 R418 R248 L26 CN7 C95 C88 C69 C44 C24 C204 IC23 1 3 4 5 D3 D11 C43 C59 R85 R31 IC11 1 10 11 20 C192 C194 C131 C137 C202 C36 C27 C42 C33 R140 R37 C17 C21 C29 C25 C34 L18 L9 L6 L7 IC7 1 3 4 6 O I G R134 R146 R165 R143 R114 R153 R65 R62 R105 R145 R144 R131 C165 C172 C...

Page 48: ...56 T R P N L J H F D B S Q O M K I G E C A 1 3 5 7 2 4 6 SCHEMATIC DIAGRAM TK 480 481 Note Components marked with a dot are parts of pattern 1 ...

Page 49: ...TK 480 481 TK 480 481 57 BLOCK DIAGRAM ...

Page 50: ... 135mVrms 29mVrms AF C169 L30 ANT C143 L11 C139 Q9 C122 L20 C110 Q6 R60 XF1 R51 Q5 C55 FM IF SYSTEM CF1 2 IC8 AMP 118 0dBm 119 0dBm 119 4dBm 120 4dBm 107 0dBm 110 3dBm 106 8dBm 116 4dBm 109 6dBm C55 open 241mVrms 265mVrms 79 2dBm 80 2dBm RF 860 50MHz IF1 44 85MHz IF2 455kHz AF To make measurements in the AF section connect the oscilloscope proves directly ANT input 47dBm 1kHz FM 3kHz dev In the RF...

Page 51: ...mVrms AF C169 L30 ANT C143 L11 C139 Q9 C122 L20 C110 Q6 R60 XF1 R51 Q5 C55 FM IF SYSTEM CF1 2 IC8 AMP 118 0dBm 118 4dBm 118 4dBm 118 0dBm 108 3dBm 106 6dBm 105 5dBm 117 0dBm 107 5dBm C55 open 115mVrms 268mVrms 58dBm 55dBm RF 938 00MHz IF1 44 85MHz IF2 455kHz AF To make measurements in the AF section connect the oscilloscope proves directly ANT input 47dBm 1kHz FM 1 5kHz dev In the RF section use a...

Page 52: ...harging current 1500mAh Dimensions mm 58 0 W x 110 8 H x 20 0 D Projections included Charger and charging time KSC 19 Normal Charger Approx 8 hours KSC 20 Rapid charger Approx 1 3 hour Weight 220g KPG 36 External View KNB 16A KNB 17A Circuit Diagram Circuit Diagram KSC 19 External View KSC 19 Charging KNB 16A Voltage 7 2V Battery capacity 1100mAh Charging time Approx 8 hours KNB 17A Voltage 7 2V B...

Page 53: ...includes antenna and belt hook Receiver Measurements made per TIA EIA 603 RF Input Impedance 50Ω Sensitivity 12dB SINAD 0 30µV Selectivity TK 480 70dB 25kHz TK 481 63dB 12 5kHz Intermodulation TK 480 65dB 25 50kHz TK 481 60dB 12 5 25kHz Spurious Except for IF 1 2 70dB Frequency Stability TK 480 0 00025 30 C to 60 C TK 481 0 00015 30 C to 60 C Channel Spread TK 480 19MHz TK 481 6MHz Audio Power Out...

Page 54: ...63 TK 480 481 ...

Page 55: ... 75018 Paris France KENWOOD ELECTRONICS U K LIMITED KENWOOD House Dwight Road Watford Herts WD1 8EB United Kingdom KENWOOD ELECTRONICS EUROPE B V Amsterdamseweg 37 1422 AC Uithoorn The Netherlands KENWOOD ELECTRONICS ITALIA S p A Via G Sirtori 7 9 20129 Milano Italy KENWOOD IBERICA S A Bolivia 239 08020 Barcelona Spain KENWOOD ELECTRONICS AUSTRALIA PTY LTD A C N 001 499 074 16 Giffnock Avenue Cent...

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Kenwood FM Transceiver TK-481, Service Manual

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Summary of Contents for FM Transceiver TK-481

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