Kenwood TK-780 series Service Manual Supplement Download Page 1

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VHF FM TRANSCEIVER

TK-780/H

SERVICE MANUAL

GENERAL ................................................................. 2

OPERATING FEATURES ......................................... 3

REALIGNMENT ...................................................... 15

INSTALLATION ...................................................... 20

CIRCUIT DESCRIPTION ......................................... 28

SEMICONDUCTOR DATA ..................................... 33

DESCRIPTION OF COMPONENTS ....................... 35

PARTS LIST ............................................................ 37

EXPLODED VIEW .................................................. 47

PACKING ................................................................ 48

ADJUSTMENT ....................................................... 49

PC BOARD VIEWS

PLL/VCO (X58-4540-11) : K2,HK2 .................... 57

PLL/VCO (X58-4712-70) : K,HK ........................ 58

TX-RX UNIT (X57-6480-XX) (A/2) ................... 59

TX-RX UNIT (X57-6480-XX) (B/2) .................... 65

SCHEMATIC DIAGRAM ........................................ 69

BLOCK DIAGRAM .................................................. 77

LEVEL DIAGRAM................................................... 80

TERMINAL FUNCTION ......................................... 82

SPECIFICATIONS................................................... 83

CONTENTS

Microphone
(T91-0621-05)

Cabinet (Top)
(A01-2165-13)

Panel assy
(A62-0991-03)

Key top
(K29-5284-02)

SUPPLEMENT

This service manual applied to products with 30200001 or subsequent serial numbers.
In terms of the products with the serial numbers earier than 30200001, refer to the TK-780/H
service manual as per part No. B51-8461-10.

Summary of Contents for TK-780 series

Page 1: ...2 HK2 57 PLL VCO X58 4712 70 K HK 58 TX RX UNIT X57 6480 XX A 2 59 TX RX UNIT X57 6480 XX B 2 65 SCHEMATIC DIAGRAM 69 BLOCK DIAGRAM 77 LEVEL DIAGRAM 80 TERMINAL FUNCTION 82 SPECIFICATIONS 83 CONTENTS Microphone T91 0621 05 Cabinet Top A01 2165 13 Panel assy A62 0991 03 Key top K29 5284 02 SUPPLEMENT This service manual applied to products with 30200001 or subsequent serial numbers In terms of the ...

Page 2: ...sted before shipment How ever it is recommended that receiver and transmitter opera tion 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...

Page 3: ...ures The TK 780 780H is a VHF FM radio designed to operate in both trunking format LTR model and conventional for mat Conventional model The programmable features are summarized Model Trunking format Trunking mode Conventional format Conventional mode 1 1 Trunking Format This format can handle up to 32 systems with up to 250 groups in each system The transceiver can be used in both trunked mode an...

Page 4: ... each time the channel number to be selected is incremented decremented and repeats if held for one second or longer This key works as the voice scrambler code selector in the voice scrambler code select mode OPERATING FEATURES DTMF ID BOT In conventional mode if you press this key a predeter mined DTMF ID Begin of TX will be sent automatically DTMF ID EOT In conventional mode if you press this ke...

Page 5: ...e PTT switch at this time will transmit the dis played DTMF code Scan Press this key starts scanning Pressing this key stops scanning Scan del add 1 Trunking format Used to select whether system scan routines are used during system scan Each pressing of the key to ON toggles between lockout and lock The scan routine is started when on lock The DEL indicator flashes when the system is on lockout 2 ...

Page 6: ...crambler _ function The delete indicator shows the systems locked out of the scanning sequence Selective call and scrambler are optional functions that can be programmed Dispalys received messages when using FleetSync 10 A B C D key These keys are programmable function PF keys MODULAR MIC JACK MONITOR SCAN POWER BUSY TX LED VOLUME UP VOLUME DOWN SYSTEM UP Trunking Format GROUP UP Conventional Form...

Page 7: ... group was changed while scanning the newly selected system group OPERATING FEATURES Selected Talkback revert If the system group was changed while scanning the newly selected system group The transceiver talks back on the current receive group Scan massage wait The time for staying with the home repeater that re ceives a signal during system scan and monitoring data messages can be programmed If ...

Page 8: ...ts to the priority channel 2 Priority talkback The transceiver reverts to the priority channel If you press PTT during a resume timer dropout delay time TX dwell time or calling you can transmit on cur rent channel to answer to the call however revert channel is set to priority channel After resume time scan re starts and transmission chan nel is return to priority channel 3 Selected channel The t...

Page 9: ...tomatic Power Switch Off Timed power off timer starts from the ignition off After the timer expires the radio will automatically turn off The timer will be reset if the ignition is turned on and off This function requires ignition sense Connect the igni tion line to the 9 pin connector which is located at the rear of the radio After the timer expires press the power switch to turn on the radio OPE...

Page 10: ...a response within the time set 0 to 300 seconds in 1 second increments If the PTT button is pressed within the time the transpond is not preformed Transmit inhibit The transceiver can be programmed with a transmit in hibit block of ID codes If an ID code within this block is decoded the preset time before the PTT button is pressed transmission is inhibited The BUSY indicator lights and a busy tone...

Page 11: ...on matches Action OR QT DQT ID DTMF 2 tone Option matches Action AF mute open AND QT DQT ID DTMF 2 tone Option matches Action OR QT DQT ID Signalling only matches Action With OR set up alert transpond will not function with only DTMF Trunking format With OR set up AF mute will not release when only DTMF matches With a conventional channel not set up with QT or DQT only the carrier is considered wh...

Page 12: ...rgency status Note Remote stun works with DTMF D B D function also Automatic status response If you pre select a status number and leave the radio in the Status Mode it can automatically respond with the se lected status number upon request from the base station The request function is initiated by serial control on the base station Optional Short Messase Optional A maximum of 48 characters can be...

Page 13: ...e set ac cording to your PC application 2 MAP HEADER KW1 PKLDS This is a Kenwood original sentence which consists of GPGLL Fleet ID Status This item should be set according to your PC application 3 MAP HEADER KW2 PKLID This is a Kenwood original sentence which consists of Fleet ID This should be set according to your PC application Parameters GTC count Number of Go To data Channel messages to be s...

Page 14: ...out is functioning You can select yes or no for the optional feature s warning tone Group Call Tone Sounds when a group call with the correct DTMF 2 tone option signalling is received repeats 7 times You can se lect yes or no for the optional feature s warning tone Individual Call Tone Sounds when an individual call with the correct DTMF 2 tone option signalling is received You can select yes or n...

Page 15: ...unds when a possible connection to a repeater in sys tem search is not mode You can select yes or no for the optional feature s warning tone Pre Alert Tone Conventional Format Sounds prior to the TOT TX inhibit activation If TOT pre alert is set the tone sounds at the amount of time pro grammed before the TOT expires TOT time TOT pre alert time Pre alert tone sounding time You can select yes or no...

Page 16: ...is not neces sary to modify the 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 format via the modular microphone jack KPG 49D instruction manual parts No B62 1096 XX 6 Firmware Programming Mode 6 1 Preface Flash memory is mounte...

Page 17: ...be accepted When you enter the correct password and CLONE MODE is displayed the TK 780 780H can be used as the cloning master The following describes how to enter the password 3 How to enter the password with the microphone keypad If you press a key while CLONE LOCK is displayed the number that was pressed is displayed on the TK 780 780H Each press of the key shifts the display in order to the lef...

Page 18: ...ars Press MON to return to the original display SELF PROG 9 1 Flow Chart Self programming mode MON MON Channel setting mode Channel selection Group selection B D D OFF QT OFF D S D DQT N DQT I C MON MON MON MON MON MON MON MON MON RX frequency B C B C B C B C B C B C B C B C B C RX signalling TX freuency TX signalling Scan delete add Busy channel lockout yes no RF power high low Beat shift yes no ...

Page 19: ...me Off Reset time Off Beep BEP All beep settings are turned on or off On Power on tone On Control tone On Warning tone On Off Power on tone Off Control tone Off Warning tone Off Off hook decode H_D Enable Disable Off hook scan H_S Enable Disable Off hook horn alert H_H Enable Disable Self programming mode D Function setting mode A key function B C B C B C B C B C B C B C B C B C B C B C B C B C B ...

Page 20: ...e input 3 D 3 IGN Ignition sense input 4 D 1 DEO Receiver detector output 5 D 6 MI External microphone input 1 TXS Transmitter sense output 6 B 2 E Ground 7 B 3 SB Switched B DC 13 6V output Maximum 0 75A 8 D 7 PTT External PTT input active low During DTC is low it works as DATA PTT 9 D 4 DI Data modulation input 10 B 1 HOR Horn alert call output 11 D 8 SQ Squelch detect output Conventional Logic ...

Page 21: ...t active low R12 R167 R24 R94 R168 R13 R51 R18 R64 TX RX unit A 2 Foil side view R6 R5 R84 2 Accessory Terminal 2 1 Terminal Function Connector Pin Pin I O Function No No name CN1 1 DEO O Detect signal output Output level DO 250mVrms standard modulation 2 AHK I External hook signal input AH COM2 port must be select AUX HOOK PTT DATA PTT function in the KPG 49D On hook L Off hook H BUSY O System bu...

Page 22: ...oard are provided at the TX RX unit A 2 and TX RX unit B 2 The table below shows the correspondence between the board and termi nals Disconnect R529 and R571 in TX RX unit B 2 when the scrambler board is attached The table below shown the differences between the schematic terminals and the PC board terminals Schematic diagram PC board view Name I O Function Name Unit SB Switched B DC 13 6V SB TX R...

Page 23: ...to pin 3 of the square plug 1 supplied with the KCT 19 then insert the square plug into the KCT 19 connector 3 1 3 6 13 15 KCT 18 KCT 19 Contact 3 2 1 Fig 3 4 2 Modifying the Transceiver Modify the transceiver as follows to turn the power or the Horn Alert or Manual Relay function on and off with the ignition key 1 Remove the lower half of the transceiver case 2 Set jumper resistors 0Ω R151 and R1...

Page 24: ...1 2 Fig 5 Fig 6 6 Interface Cable KCT 31 Option The KCT 31 is a RS 232C interface cable for LMR mobile radios TK 780 780H The 9 pin D sub connector is connected to an external RS 232C terminal The other end of the cable is connected to the internal connector of LMR mobile radio Note You cannot write a firmware with the KCT 31 6 1 Features This KCT 31 has a RS 232C TTL level interface circuit This ...

Page 25: ... COM2 is used When the COM1 is used 6 3 Installing the KCT 31 in the transceiver Note When the COM1 is used A connector is unused When the COM2 is used C connector is unused 1 Bind the unused connecor to the cable with a retaining band as shown When the COM1 is used When the COM2 is used Red Black Yellow Green A B C Fig 7 Fig 8 Fig 9 Note The modification must be applied to the TK 780 780H transce...

Page 26: ... unit into the connectors on the transceiver 3 Secure the switch unit board to the chassis with a screw 3 The notch 2 in the board must be placed at the front left side 4 Attach the cushion on the top of the KAP 1 switch unit 8 Fitting the Control Panel Upside Down The TK 780 780H control panel can be fitted upside down so the transceiver can be mounted with its internal speaker in the upper half ...

Page 27: ...n the transceiver See the KCT 19 section 2 Insert the crimp terminal into the square plug supplied with the KCT 19 3 Connect CN5 of the transceiver to connector C of the KCT 19 instead of to the internal speaker connector KES 4 1 3 6 13 15 12 Crimp terminal E23 0613 05 Black lead Black White lead Fig 15 6 Rotate the control panel 180 degrees and mount it on the transceiver Refit the two halves of ...

Page 28: ...y IC202 to produce the first IF signal of 44 85 MHz The first local signal passes through an LPF and an attenuator to eliminate unwanted harmonics components and implement the optimum input level to the mixer then enters IC202 A DBM is used as a mixer to achieve a high potential The signal output from the mixer passes through two MCFs XF1 The signal is amplified by an intermediate fre quency ampli...

Page 29: ...nd D107 by using the control voltage CV through CN101 The control voltage is changed by turning the trimmer capacitor TC102 The output from Q103 is applied to the buffer amplifier Q106 to generate a VCO output signal This signal is used as a drive input signal or a local signal of the first mixer Since a signal output from Q106 is input to the PLL IC it passes through CN101 and buffer amplifier Q3...

Page 30: ...signal from the VCO is amplified to a specified level of the power module IC400 by the drive block Q203 Q204 The amplified signal passes through the transmission reception selection diode D211 and goes to a low pass filter The low pass filter removes unwanted high frequency harmonic components and the resulting sig nal is goes the antenna terminal APC Circuit The automatic transmission power contr...

Page 31: ...goes to the MD pin of the VCO This signal is applied to a varicap diode in the VCO for direct FM modulation IC511 CPU KEY7 KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 MONI A D SCAN SYS DOWN SYS UP B C VOL UP VOL DOWN FSW Q511 Fig 12 Key matrix circuit Encode The QT DQT and LTR signals are output from LSDO of the CPU IC511 and go to the D A converter IC5 of the TX RX unit A 2 The DTMF signal is output from HSDO ...

Page 32: ...ignal is inverted by Q26 and sent to a flip flop IC IC15 This IC outputs a con trol signal when the PSW goes low When the power turns on pin 1 of IC15 outputs a low signal and Q30 turns on The base of Q28 goes high Q28 turns on SB SW Q27 turns on and power SB is supplied to the set This circuit has an over voltage protection circuit If a DC voltage of 20 V or higher is applied to the power cable D...

Page 33: ...I PLL unlock detect input 32 AFMSKE O MSK modulation enable Enable active H 33 TXD O Serial interface output 34 HOOK I Hook input Serial interface input 35 AFDAT O MSK data output Pin No Name I O Function 36 RFCLK O Common clock output TX RX unit A 2 37 RDY Not used 38 ALE Not used 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 bu...

Page 34: ...mmable active H L 6 Q3 STR VCO shift switching H TX L RX 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 ...

Page 35: ... on time on Q13 8T SW control KEY H time on Q15 IF amp 44 85MHz Q16 DET output level Wide time on switch Q17 PC switch TX 8T time on Ref No Use Function Operation Condition Q18 DET mute KEY H time on Q19 APC APC driver Q20 APC APC pre driver Q21 APC control Q22 TOF switch TOF H time on Q23 W N switch Wide time off Q24 W N switch Wide time on Q25 TOF switch Q22 on time on Q26 Inverter Power switch ...

Page 36: ... switch LG H time on Busy time green on Q509 LED switch LR H time on TX time red on Q510 Clock switch shift BSFT H time clock shift on Q511 FSW swtich FSW L time foot switch on Q512 Key backlight switch KBLC H time on Q513 Key backlight switch KBLC H time key backlight on Q515 Key backlight switch DESCRIPTION OF COMPONENTS Ref No Use Function Operation Condition D501 Surge absorption BLC D502 Over...

Page 37: ...n EX R D 7 3 E B 2 B 0 0 0 J 1 2 3 4 5 6 7 Chip B F Carbon resistor Normal type EX R D 1 4 B B 2 C 0 0 0 J 1 2 3 4 5 6 7 1 Type ceramic electrolytic etc 5 Voltage rating 2 Shape round square ect 6 Value 3 Dimension 7 Tolerance 4 Temp coefficient Capacitor value 010 1pF 100 10pF 101 100pF 102 1000pF 0 001µF 103 0 01µF Less than 10pF Code B C D F G pF 0 1 0 25 0 5 1 2 1st word 2nd word Refer to the ...

Page 38: ...6 BRAZIER HEAD TAPTITE SCREW 39 2D N99 0395 05 SCREW SET 41 1B T07 0246 05 SPEAKER 42 1D T91 0621 05 MICROPHONE ACC D511 B30 2151 05 LED RED GREEN D512 517 B30 2171 05 LED D C1 15 CK73GB1H102K CHIP C 1000PF K C16 C92 0507 05 CHIP TAN 4 7UF 6 3WV TK 780 780H C17 CK73GB1C104K CHIP C 0 10UF K C18 C92 0507 05 CHIP TAN 4 7UF 6 3WV C19 CC73GCH1H100D CHIP C 10PF D C20 CK73GB1E103K CHIP C 0 010UF K C21 22...

Page 39: ... C145 CK73GB1H103K CHIP C 0 010UF K K2 HK2 C145 146 CK73GB1H471K CHIP C 470PF K K HK C146 CK73GB1H471K CHIP C 470PF K K2 C147 CC73FCH1H0R5B CHIP C 0 5PF B C148 CK73GB1H102K CHIP C 1000PF K C149 CC73FCH1H010B CHIP C 1 0PF B K2 HK2 C149 CC73FCH1H020B CHIP C 2 0PF B K HK C150 CK73GB1H221K CHIP C 220PF K C151 CC73GCH1H820J CHIP C 82PF J C152 C92 0777 05 CHIP ELE 1000UF 25WV C153 CC73GCH1H040C CHIP C 4...

Page 40: ...CHIP C 0 22UF K C317 CK73GB1H102K CHIP C 1000PF K C318 319 CK73GB1C104K CHIP C 0 10UF K C320 C92 0514 05 CHIP TAN 2 2UF 10WV C321 CC73GCH1H060D CHIP C 6 0PF D C322 C92 0514 05 CHIP TAN 2 2UF 10WV C324 CK73FB1E104K CHIP C 0 10UF K C325 C92 0002 05 CHIP TAN 0 22UF 35WV C326 CK73FF1C105Z CHIP C 1 0UF Z C327 CK73FB1E104K CHIP C 0 10UF K C401 CK73GB1H102K CHIP C 1000PF K C402 C92 0628 05 CHIP TAN 10UF ...

Page 41: ...0 047UF K TC1 C05 0371 05 CERAMIC TRIMMER CAP 10PF HK CN1 E40 5737 05 PIN ASSY CN2 E40 5738 05 PIN ASSY CN3 E40 3247 05 PIN ASSY CN4 E40 5738 05 PIN ASSY CN5 E40 3247 05 PIN ASSY CN6 E40 3246 05 PIN ASSY CN7 E40 5982 05 FLAT CABLE CONNECTOR CN501 E40 5823 05 FLAT CABLE CONNECTOR CN502 E40 5982 05 FLAT CABLE CONNECTOR J1 2C E11 0442 05 3 5D PHONE JACK 3P J501 1B E08 0877 05 MODULAR JACK J31 0543 05...

Page 42: ...R 1 0K J 1 16W R70 73 R92 1252 05 CHIP R 0 OHM R74 RK73GB1J473J CHIP R 47K J 1 16W R75 RK73GB1J102J CHIP R 1 0K J 1 16W R76 RK73GB1J153J CHIP R 15K J 1 16W R77 RK73GB1J333J CHIP R 33K J 1 16W R78 RK73GB1J561J CHIP R 560 J 1 16W R80 RK73GB1J473J CHIP R 47K J 1 16W R85 RK73GB1J102J CHIP R 1 0K J 1 16W R86 R92 1252 05 CHIP R 0 OHM R89 R92 1252 05 CHIP R 0 OHM R90 RK73GB1J2R2J CHIP R 2 2 J 1 16W R91 R...

Page 43: ...J CHIP R 10 J 1 10W K2 R250 RK73FB2A120J CHIP R 12 J 1 10W HK HK2 R250 R92 0670 05 CHIP R 0 OHM K R251 RK73FB2A102J CHIP R 1 0K J 1 10W K2 R251 RK73FB2A471J CHIP R 470 J 1 10W HK HK2 R252 RK73FB2A100J CHIP R 10 J 1 10W K2 R300 303 RK73GB1J470J CHIP R 47 J 1 16W R304 R92 1252 05 CHIP R 0 OHM R305 RK73GB1J103J CHIP R 10K J 1 16W R306 RK73GB1J271J CHIP R 270 J 1 16W R307 R92 1252 05 CHIP R 0 OHM R308...

Page 44: ...2J CHIP R 1 0K J 1 16W R621 R92 1252 05 CHIP R 0 OHM R622 623 RK73HB1J102J CHIP R 1 0K J 1 16W R624 R92 1252 05 CHIP R 0 OHM R625 627 RK73HB1J102J CHIP R 1 0K J 1 16W R628 629 R92 1368 05 CHIP R 0 OHM R630 RK73HB1J102J CHIP R 1 0K J 1 16W R631 R92 1368 05 CHIP R 0 OHM R632 RK73HB1J102J CHIP R 1 0K J 1 16W R633 R92 1368 05 CHIP R 0 OHM R634 RK73HB1J102J CHIP R 1 0K J 1 16W R635 R92 1368 05 CHIP R 0...

Page 45: ...114EE DIGITAL TRANSISTOR Q7 2SC4215 Y TRANSISTOR Q8 DTC363EU DIGITAL TRANSISTOR Q9 DTA114YUA DIGITAL TRANSISTOR Q10 DTC114EE DIGITAL TRANSISTOR Q11 2SA1362 Y TRANSISTOR Q12 2SB1132 Q R TRANSISTOR Q13 DTC114EE DIGITAL TRANSISTOR Q15 2SC2059K P TRANSISTOR Q16 DTC144EE DIGITAL TRANSISTOR Q17 2SC2412K S TRANSISTOR Q18 2SK1824 FET Q19 2SD2394 TRANSISTOR Q20 2SB1188 Q TRANSISTOR Q21 FMW1 TRANSISTOR Q22 ...

Page 46: ...Q106 2SC4215 Y TRANSISTOR K2 HK2 C102 103 CK73GB1H102K CHIP C 1000PF K K HK C104 CC73GCH1H680J CHIP C 68PF J K HK C105 CK73GB1H102K CHIP C 1000PF K K HK PLL VCO X58 4540 11 PLL VCO X58 4712 70 C107 CC73GCH1H150J CHIP C 15PF J K HK C108 CC73GCH1H470J CHIP C 47PF J K HK C109 CK73GB1C104K CHIP C 0 10UF K K HK C110 CK73GB1H102K CHIP C 1000PF K K HK C111 CK73FB1C474K CHIP C 0 47UF K K HK C113 CC73GCH1H...

Page 47: ...pplied 1 2 A B C 10 12 24 8 21 IC400 26 J1 23 13 2 23 3 37 6 J501 22x2 21 1 23 16 41 14 19x2 25 Cx2 701 702 B B Cx2 Dx11 704 Ax2 C C 703 703 A A TX RX unit B 2 TX RX unit A 2 A M2 6 x 6 OC BLK N33 2606 45 B M x 8 N67 3008 46 C M2 6 x 6 Br Tap N87 2606 46 D M2 6 x 12 Br Tap N87 2612 46 ...

Page 48: ... 05 TK 780H 5 Cap B09 0235 05 35 Bracket J29 0627 23 30 Inner packing case H12 1391 03 34 Holder J19 1584 05 39 Screw set N99 0395 05 705 Warranty card 7 Instruction manual B62 1549 00 28 Polystyrene foamed fixture H10 6618 12 TK 780 H10 6629 02 TK 780H 32 Item carton case H52 1257 02 TK 780 H52 1481 02 TK 780H 29 Polystyrene foamed fixture H10 6619 12 TK 780 H10 6628 02 TK 780H 31 Protection bag ...

Page 49: ...here is a carrier Sub LCD indicator FCN Appears at function on n Appears at narrow on Frequency and Signalling The set has been adjusted for the frequencies shown in the following table When required re adjust them follow ing the adjustment procedure to obtain the frequencies you want in actual operation Frequency MHz Channel No K HK K2 HK2 RX TX RX TX 1 160 050 160 100 149 050 149 100 2 146 050 1...

Page 50: ...FDQT 256 Fine DQT W L n FDQT 256 Fine DQT Narrow A A A A C C C C FDQT 256 Fine DQT W C C H FDQT 256 Fine DQT W H D FLTR 256 Fine LTR Wide L FLTR 256 Fine LTR W L n FLTR 256 Fine LTR Narrow A A A A C C C C FLTR 256 Fine LTR W C C H FLTR 256 Fine LTR W H SENS 256 Seisitivity L SENS 256 Sensitivity Low A A A A C C C C SENS 256 Sensitivity Cen C H SENS 256 Sensitivity Hi D C C DTMF 256 DTMF deviation ...

Page 51: ...itivity Frequency Range 10Hz to 1000MHz Frequency Counter Frequency Stability 0 2ppm or less 7 Ammeter 20A 8 AF Volt Meter Frequency Range 50Hz to 10kHz AF VTVM Voltage Range 1mV to 20V 9 Audio Generator AG Frequency Range 20Hz to 20kHz or more Output 0 to 1V 10 Distortion Meter Capability 3 or less at 1kHz Input Level 50mV to 10Vrms 11 4Ω Dummy Load Approx 4Ω 10W or more 12 Regulated Power Supply...

Page 52: ...re changed program the data again EEPROM The tuning data Deviation Squelch etc for the EEPROM is stored in memory When parts are changed readjust the transceiver Measurement Test equipment Unit Terminal Adjustment Unit Parts Method Specifications Remarks Condition Item 1 PLL lock 1 Set test mode DVM TX RX TP1 PLL TC101 1 5V 0 1V voltage CH CH3 Sig1 Power meter A 2 AUX ON Talk around mode F conter ...

Page 53: ...160 050MHz K2 HK2 149 050MHz 3 H SENS Adjust for SSG freq maximum SINAD K HK 173 950MHz K2 HK2 161 950MHz 3 Squelch 1 Set test mode Squelch closed Select SQL in tuning mode once SSG freq Then squelch must K HK 160 050MHz be opened K2 HK2 149 050MHz SSG output Value of 12dB SINAD SSG MOD 3kHz Wide 1 5kHz Narrow 4 Image 1 Set test mode TX RX TC1 Adjust for maximum response CH CH2 Sig1 A 2 noise leve...

Page 54: ...HK HK2 Select H POW in tuning mode L HPOW 256 K2 HK H HPOW 256 K HK2 PTT ON 3 High power 1 Set test mode 25 0W K K2 1 0W K K2 Select H POW in tuning mode 45 0W HK HK2 2 0W HK HK2 L HPOW PTT ON 2 L2 HPOW PTT ON 3 C HPOW PTT ON 4 H2 HPOW PTT ON 5 H HPOW PTT ON 4 Low power 1 Set test mode Power meter 5 0W K K2 0 5W K K2 Select L POW in tuning mode 10 0W HK HK2 1 0W HK HK2 L LPOW PTT ON 2 L2 LPOW PTT ...

Page 55: ...Connect AG to the MIC 1 75kHz Narrow terminal According to the Select MAX in tuning mode larger L MAX AG 1kHz 50mV Deviation meter filter LPF 15kHz HPF OFF De emphasis OFF PTT ON 2 C MAX PTT ON 3 H MAX PTT ON 8 MIC 1 Set test mode Check 3kHz 0 2kHz Wide seisitivity CH CH1 Sig1 1 5kHz 0 05kHz Narrow check AG 1kHz 5mV PTT ON 9 QT deviation 1 Set test mode 0 75kHz Wide 50Hz Wide Narrow Select FQT in ...

Page 56: ... AF VTVM Front MIC PTT ON AG panel 2 C FLTR PTT ON 3 H FLTR PTT ON 12 DTMF 1 Set test mode 3 0kHz Wide 0 2kHz Wide deviation Select DTMF in tuning mode 1 5kHz Narrow 0 1kHz Narrow Deviation meter filter LPF 15kHz HPF OFF PTT ON 13 MSK 1 Set test mode 3 0kHz Wide 0 1kHz Wide Narrow deviation Select FMSK in tuning mode 1 5kHz Narrow Deviation meter filter LPF 15kHz HPF OFF PTT ON 14 TONE 1 Set test ...

Page 57: ...08 R105 L110 L109 C122 R109 C127 C129 C133 C134 C135 C136 C138 L106 Q104 Q105 Q106 Q101 C111 L105 C107 L103 C114 C121 L104 C103 C102 C126 C117 C120 C119 R116 R110 C110 C108 R101 R102 C125 R107 C115 C104 L101 C105 R103 R117 R106 R108 R104 R105 C113 L110 L109 C122 R115 R113 L102 R109 R114 R111 C127 C129 C130 D101 R118 D104 C131 C132 C133 C134 C135 C136 C138 C139 C142 D107 D109 R119 R120 R121 TC101 T...

Page 58: ... TP2 TP1 L208 R318 R317 R316 R319 R306 R307 C322 C320 C313 C327 C315 R308 L303 Q300 A1 X58 ST HT E 9CL 8CL MD CV 4 3 2 1 C292 C293 C275 C286 C245 C246 L226 L213 C93 R135 R405 IC401 1 4 5 8 C303 L300 L301 C304 R304 R89 R247 XF1 C94 C98 C96 C99 C91 C102 R110 R119 L6 Q16 C294 C133 C45 C107 C101 Q32 D G S TP3 IC11 1 8 9 16 X2 CF1 F R47 R48 R49 IC5 1 12 13 24 D11 C54 R60 R99 R97 R91 C173 Q13 C106 C105 ...

Page 59: ...3 D G S SB C111 C177 Q20 B C E IC13 TR I G O 8C 8R Q12 B C E DT ES IC7 1 8 9 16 IC8 1 8 9 16 CK C42 R64 R22 R31 D35 DEO IC2 1 4 5 8 C17 DM R16 R131 R161 R130 D23 W N KEY C116 C117 5C 8T 9C C242 R241 R239 R238 C288 C289 C290 C272 C271 R249 C244 R251 C273 C406 C407 C274 C261 C243 C200 C231 C235 C282 C283 C285 C241 C240 C237 IC400 DB 1 2 3 4 Q204 D210 E C B Q203 E C B R28 R27 C183 R34 R26 R75 R170 R1...

Page 60: ...O R3 R2 R1 C9 C7 C6 C5 C3 C2 C1 C13 C8 C4 RSSI D9 D12 D14 R305 R129 R114 R121 R300 IC300 1 10 11 20 R303 R302 R301 R218 R219 R68 L2 C59 R222 R225 R226 R246 R248 IC202 1 3 4 6 D208 C204 L224 C298 C326 C324 C316 C317 C321 C312 C311 C309 C307 C306 C305 C325 C314 L302 C318 C319 C100 C16 R158 Q302 Q301 C212 C215 C210 C217 C222 C224 C226 D206 D207 L219 L221 L223 L227 VR1 D213 L218 L215 C252 C401 C140 D3...

Page 61: ...1 C546 C544 CP501 C599 D501 D502 IC507 IC711 1 1 3 4 5 7 8 14 C614 D505 D504 D503 L501 MUTE SPO GND Q508 Q509 R668 R667 R722 R680 R674 MPTT PTT GND R544 X501 SB R577 R566 R555 R730 R562 IC504 1 11 12 22 23 33 34 44 R522 R536 R550 R542 R564 R521 R518 R520 C514 C533 C531 C552 C515 C516 RXAI RXAO C548 C565 C570 C724 C625 C623 C608 C610 R676 R621 R619 R616 R614 R611 R670 R675 R706 R705 C633 C602 C609 ...

Page 62: ...R658 R656 R650 R649 R647 D512 PSW D511 C600 J72 0809 02 B 2 Q511 J501 CM MIC PTT TXD PSB HOOK RXD ME E BLC VOL UP VOL DN D513 A MON R525 R532 R504 R554 R541 R553 R569 R568 R573 R711 R712 R501 R511 R509 R530 R587 IC510 1 16 17 32 R503 R527 R528 C520 C509 C505 C559 C564 C542 C555 C523 C553 C519 D509 L503 C711 C508 C522 C584 C561 IC509 O G I C713 R526 R710 R514 R517 R531 R572 R510 C712 R714 R726 R502...

Page 63: ...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 780 H Note Components marked with a dot are parts of patterun 1 72 ...

Page 64: ...73 A C E G I K M O Q S B D F H J L N P R T 1 3 5 7 2 4 6 TK 780 H SCHEMATIC DIAGRAM Note Components marked with a dot are parts of patterun 1 ...

Page 65: ...TK 780 H TK 780 H TK 780 H BLOCK DIAGRAM 79 ...

Page 66: ...81 LEVEL DIAGRAM Receiver Section Transmitter Section 80 TK 780 H TK 780 H ...

Page 67: ...nput 24 EP PLL enable signal input 25 EN DA converter enable signal input 26 APTT PTT signal output 27 CP PLL clock 28 DTC Data control signal output 29 TXD Serial data 30 RXD Serial data 31 OE Serial data 32 FSW Foot switch output 33 E Ground CN101 VCO TX RX Unit A 2 Pin No Name Function 1 ST Switched transmit input H Transmit 2 HT Signal output 3 E Ground 4 9CL 9V input 5 8CL 8V input 6 MD Modul...

Page 68: ... 2 31 lbs RECEIVER Measurements made per EIA standard EIA TIA 204 D RF Input Impedance 50Ω Sensitivity EIA 12dB SINAD 0 25µV Selectivity Wide 80dB Narrow 70dB Intermodulation Wide 75dB Narrow 65dB Spurious and Image Rejection 90dB Audio Power Output 4W at 4Ω less than 5 distortion Frequency Stability 2 5ppm from 30 C to 60 C Channel Frequency Spread K HK 28MHz K2 HK2 26MHz TRANSMITTER Measurements...

Page 69: ...is 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 Centrecourt Es...

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