TK-760/762/H - The Repeater Builder`s Technical Information Page
Contents
1. DTCIAASX NJM2S04E WAT s UFF Due 2 1 2 HJMA558M y bs gt rc zxT s BEC le y int sP DEO BUSY TX RX UNIT CONTROL SECTION X57 4950 XX B 2 TK 760 C407 1C408 NJM 8LOSUA RH5VLA2ZC AVR RESET g e x E 9 S 1C409 M38267MBL156GP MICRO PROCESSOR ross 3 DTMF ECODE F u i 1 4 12450 1 LCT3B81M z a Y dg 20 2 3 Eo 1 405 272 IC405 172 16403 2 2 1 4 i NJMASSBE NJMASSBE NIM4558E NJM4858E 2408 144 Q404 DTA114TX 9407 DTAL1siX 9410 DTA114TX 1C406 1 404 i 2 257203 SUM amp M 7 T o wo RX Section Center frequency gt lt 45 05 gt 455kHz gt 121dBm 1 5Vrms High frequency VTVM 113 7dBm 96 7dBm 109 5dBm 65 7dBm 49 7dBm 0 24Vrms 6 6mVrms 0 45V 1 1 403 0208 L208 L205 206 207 XF1 016 77 SG input level for which 12dB SINAD are obtained Measured by connecting the SG to each point via 0 0015uF capacitor Squelch off AF VTVM gt AF level obtained when the AF output level is adjusted for 0 45V 4Q with the front panel2. 13 2 How To Enter Each 4 13 3 Panel Test Mode 760 bier anre th TR Rag 13 4 Panel Tuning Mode TK 760 Only 15 ER 17 LEVEL DIAGRAM c PESE 19 CIRCUIT DESCRIPTION 1 Circuit Configuration by Frequency ccccccsscsscssccscccsccessssssssensccecetsessassensseeenececsnsausuensccavsssuaeeeesacceseaensesensns 20 2 Receiving System oer eec ene 20 3 Transmitter System emet soy EU PN EX Sce 22 4 Frequency Synthesizer M me Ee NUR ERN 23 5 Display S ction m 24 Bi Control Section E E T TE E E E E 24 SEMICONDUCTOR LEER 27 DESCRIPTION OF COMPONENTS erri teo Sects ac E A A a GR as E DRE DAR E Fo Ea EY ERA E ea e 31 PARES aln MET 34 EXPLODED VIEW EE 41 PACKING ere EV EE a tuta Eee ee et AN EA A NOAS 42 ADJUSTMENT nanan e a a a ain 43 TERMINAL FUNCTION Mer 49 PC BOARD VIEWS CIRCUIT DIAGRAMS VCO Xb8 43060 XX yesh DE i sorte cd auth
3. Center RF power High 1 256 High RF low power Max deviation Max deviation Low 1 256 1 256 1 256 KM UHF F1 DOT balance Three point adjustment Low Max deviation Center 1 256 Center Max deviation High 1 256 OT deviation 1 256 DOT deviation 1 256 Sensitivity L Sensitivity Low 1 256 Three point adjustment Low Sensitivity Center 1 256 Center Sensitivity High 1 256 High Squelch Table 5 Panel tuning state transition PANEL TUNING FREQUENCY 1 2 RF POWER Three point adjustment 2L RF POWER LOW 8C SENSITIVITY CENTER 8H SENSITIVITY HIGH 9 SQUELCH Data save next item CH DOWN key Next item previous item MON key A key Table 6 1 760 TX RX UNIT TX RX SECTION X57 4950 XX A 2 760 57 5100 A 2 TK 762 1 220 NJMTBLOSUA or TATELOSF ac DSA3A1 FK 214 Ica 915 CSUB UNIT DSN3MA NJMTSLOSUA 25C4115CGRD DC 13 6 9 Q4 184 2SAlG41 S T TATEOBS 05 25 5 52 03 04 1SV259 25 PU l DTZY14EU PSW 2 2 2 TF 02 15 269 BU4013BF RX VCO seto 3U4OSABCT ar XRU4094BCF i ICIS TATSSOLF AMP Liew AM t MTT ZPSW Le 1 8 1 2 NJM2904E 9204
4. Microprocessor M38267M8L156GP TX RX Unit 1 409 Terminal connection diagram Term 12 511 510 59 58 57 S6 S5 54 S3 2 1 50 VDD VREF COM2 VL3 VL2 inal function Uu S14 15 516 17 18 19 20 21 22 23 EN EP HNC ES DT KEY CK COR SMRD SCR B2 Bi AC MM PA 5SC KM20 SELF D A MON AUX SCN VLDN VLUP AHK APTT VSS X XCO RST SMDI W N MONG CHIR TEST CH1G ECK EDT 34285559822 63 a 2 2 2 Function LD PLL lock detect 1 Unlock Lock Nor used Pin No 2 3 7 4 5 AUXR center voltage input signal input AUX LED L On Off TK 762 only AUX LED Green L On H TK 762 only CH2 LED 17 On Off TK 762 only CH2 LED green L On Off TK 762 only TX sense L PTT off H PTT on DTMF output 2 tone input Squelch noise pulse input CH down L On Off CH up L On Off CH version 417 32ch 2ch QT DOT PWM output Normal microphone L On Off DTMF microphone serial interface Microphone hook L On hook H Off hook 27 TK 760 762 SEMI
5. R1 in the KAP 1 R1 Output form HR1 Default Enable Disable Public Address The signa from pin 14 of IC10 of the TX RX unit drives PA relay K1 in the KAP 1 and switches the audio power amplifier output between the external PA sys tem through KCT 19 and internal and external speak ers To use the PA function R80 on the TX RX unit must be removed See Fig 7 TX RX UNIT A 2 Foil side view R80 Use the PA function Disable Do not use the PA function Enable 10 TK 760 762 INSTALLATION 3 3 Others If the PA and HR2 are not necessary and the speaker output is output to an external unit through the KCT 19 connect the KCT 19 C connector to CN5 on the TX RX unit TX RX UNIT KAP 1 SWITCH UNIT X41 3380 20 J Hsc ee re ee M RN DTD114EK 01 2 155193 10 VO port Audio i 8 5 5 1 power amp LS seo Le N 5 oe F 1 speaker 4 DTMF Decode If the DTMF decode function such as code squelch is necessary the general purpose decode IC LC73881M SANYO must be installed Installation procedure 1 Remove the upper and lower case and the panel 2 Solder the IC to the PCB land of the TX RX unit con trol section 1 1 00000 1
6. Set jumper resistors 00 R5 and R6 of the TX RX unit A 2 as shown in Table 1 ANT Operation when KCT 18 is connected Power on off and Horn Alert on off Disable Horn Alert on off Disable Fig 3 Fig 4 lt KCT 18 cannot be connected lt Power cannot be turned on Table 1 R5 and R6 setup chart The Horn Alert function can be turned on and off only if the function has been assigned to the AUX key TK 760 762 INSTALLATION 3 PA HA Unit KAP 1 Option 3 1 Installing the KAP 1 in the transceiver The Horn Alert max 2A drive and Public Address functions are enabled by inserting the KAP 1 W1 white black red into CN4 on the TX RX unit inserting W2 3P green into CN201 on the TX RX unit and con necting the KCT 19 option to CN2 and CN3 of the 1 Installation procedure Open the upper case of the transceiver 2 Insert the two cables Q9 with connectors from the KAP 1 switch unit into the connectors on the trans ceiver 3 Secure the switch unit board on the chassis with two screws with the notch in the board placed at the front left side 225 3 2 Modifying the transceiver Horn Alert The signal from 62 of IC409 CPU on the TX RX unit turns O13 and Q14 on and off and drives KAP 1 HA relay K2 to drive the horn with a maximum of 2A The default output is HR1 The relay open output can be obtained between HR1 and HR2 by removing
7. and controls the DC amplifier Q22 and Q23 to keep the transmit final current constant thus keeping the transmit output constant Q205 206 IC501 p17 DC CURR 1 l 1 Fig 5 Transmit power circuit circuit ANT SW 3 3 APC circuit The direct current that flows through the power module IC501 produces a voltage across resistors R108 This voltage is applied to pin 6 of IC13 2 2 and is input as the reference voltage difference of pin 5 and amplified D20 ANT 760 762 CIRCUIT DESCRIPTION 4 Frequency Synthesizer Unit 4 1 VCO PLL The PLL generates the transmit signal and the first local oscillator receive signal The RF signal generated by Q5 TX or Q2 RX in the VCO unit is amplified by O3 and the resulting signal is output to the TX RX unit TX and RX Q5 and 02 are switched by turning the source line for Q5 and O2 on and off This is done by O4 and Q1 using the control signal STR generated by the serial to parallel converter in the TX RX unit The RF signal passes through Q3 of the VCO unit and am plifier Q209 of the TX RX unit and is input to IC202 PLL IC The 12 8MHz PLL reference signal generated by the VCXO X1 in the TX RX unit is also input to 202 58 4360 Both signals are divided according to the division data from the control unit to produce a 12 5kHz signal The phases are compared and a phase difference sig nal is output and passes thr
8. cor Ev TED ATA 50 TX RX UNIT TX RX X57 4950 XX A 2 TK 760 X57 5100 XX A 2 762 51 TX RX UNIT CONTROL 57 4950 B 2 TK 760 X57 5100 XX B 2 762 61 EEA AOI ED oett o nter Bra oot PU E RR in to uta 71 2500 BACK COVER TK 760 762 GENERAL INTRODUCTION SCOPE OF THIS MANUAL This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment It contains all re quired service information for the equipment and is current as of the publication data Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions These are issued as re quired ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment in formation 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 is a part and a suffi cient description of the required component for proper identification PERSONNEL SAFETY The following precautions are recommended for personnel safety DO NOT transmit if someone is within two feet 0 6 meter of the antenna DO NOT transmit until all RF connectors are verifie
9. 760 762 supplied on a 3 5 or 5 25 floppy disk This software runs under MS DOS version 3 3 or later on an IBM PC XT AT or PS2 or on a compatible machine Data can be input to or read from the TK 760 762 and edited on the screen Programmed data can be printed Communication port RS 232C 1 4 Data Program Mode In this mode data is written into the flash memory in the transceiver When the power is turned on data program mode can be entered immediately When the KPG 4 is connected and commands can be received PROGRAM is displayed to indicate that data program mode has been entered Tuning can be done using an IBM PC and KPG 29D in the same way as in panel tuning mode You can carry out panel tuning by selecting test mode on the KPG 29D menu screen and following the instructions on the screen See the KPG 29D instruction manual for details TK 760 762 OPERATING FEATURES INSTALLATION 1 5 Clone Mode Figure 2 Programmed data is transferred from one trans ceiver to another by using a microphone cable T 2 3 Connect the master set to the slave set with but the master set is TK 760 only Turn the slave set on Hold down the CH V key turn the master set on and keep the CH W key down for two more sec onds appears on the display to indicate that clone mode has been entered INSTALLATION 1 Accessory Connection Cable KCT 19 Option The KCT 19 is an accessory conne
10. PC TEST MODE PC TUNING MODE read from the radio This feature is include the FPU PC TEST MODE This mode can check the radio by PC control This feature is include the FPU This paragraph is as same as PANEL TUNING 2 How To Enter Each Mode Mode Operation USER MODE Usually Power ON then begin this mode PANEL TEST MODE The D A switch is held on with Power ON the radio The D A switch holding about 1 sec after Power ON the radio But if this mode is disabled by FPU then begin the USER MODE PANEL TUNING MODE The SCAN switch is held on with Power ON the radio The SCAN switch holdings about 1 sec after Power ON the radio But if this mode is disabled by FPU then begin the USER MODE PC MODE The radio Power ON to begin the USER MODE when through to the microphone then begin this mode Note PANEL TEST MODE and PANEL TUNING MODE does not begin the PC MODE 3 Panel Test Mode TK 760 Only When the test mode is entered all LCD segments All LCD segments appear light the beeper sounds for one second and VERSION SELECT mode is entered ZA CALL SCN AUX ADD Use the following keys to select a version D A UP SCN key eret DOWN e me mme Table 1 lists the versions The version is backed up when the CHANNEL DOWN key is pressed Version Display VHF F1 150 1 VHF F2 150 2 Table 1 13 TK 760 762 3 1 TEST MODE CHANNEL op
11. 0 only KEY TX key L TX off TX on Common data Shift register strobe L Load H Latch Horn control L Off H PLL chip select L Select Not select D A converter chip select L Select H Not select LCD segment 23 0 5V 5V cod qoe 21215 60 61 5 62 63 64 523 50 89 VDD 90 VREF 91 92 93 95 COM2 COMO 96 97 vis VL2 98 99 100 VLI LCD common 2 0 28 760 762 SEMICONDUCTOR DATA PLL System MC145190F TX RX UNit IC202 Terminal connection diagram REFout 1190 20 REFin LD 19 Din oR 18 CLK gv 4 17 ENB Veo 5 16 OUTPUT A PDout 6 15 OUTPUT B GND 7 14 Voo Rx 8 13 TEST2 TESTA 9 12 fin 10 11 fin Block diagram DATA OUT OSC OR 13 STAGE R COUNTER siteet he 4 STAGE m OUTPUT A 20 REFin 1 DIVIDER REFout CONFIGURABLE DOUBLE BUFFERED Bit Grabber REGISTER 16 5 18 E REGISTER ET En 8 BITS x LOCK DETECTOR 2 LD AND CONTROL hee 8 PHASE FREQUENCY 6 PDout DETECTOR A AND CONTROL 3 PHASE FREQUENCY R DETECTOR B AND CONTROLL4
12. 512 6 3 6 Earth V 10 HR1 12 PA HR2 2 5 TX RX UNIT CONTROL SECTION Fig 9 11 TK 760 762 12 5 INSTALLATION External Speaker 5 1 KES 3 Option The KES 3 is an external speaker for the 3 5 mm diameter speaker jack 1 6 Fitting the Control Panel Upside Down down so the transceiver can be mounted with its inter nal speaker in the upper half of the case facing down in your Car 1 2 Turn the panel over insert the flat cable into Connection procedure Connect the KES 3 to the 3 5 mm diameter speaker jack on the rear of the transceiver The TK 760 762 control panel can be fitted upside Remove the upper and lower case of the transceiver and remove the panel from the main unit Q9 Remove the flat cable and change the direction of bending the flat cable 6 the main unit 6 Attach the panel to the main unit and reinstall the cases TK 760 762 REALIGNMENT 1 Modes Mode Function USER MODE Customer use this mode PANEL TEST MODE Dealer uses to check the funda mental characteristics PANEL TUNING MODE Dealer uses to tune the radio PC MODE This mode is communication the radio to PC IBM compatible It requires the KPG 29D DATA PROGRAMMING MODE This mode is frequency data and features write to the radio and TK 760 only DATA PROGRAMMING MODE
13. AF VOL control Measured with AF voltmeter connected to the external speaker jack receiving a 40dB EMF SSG signal modulated at 1kHz DEV 3kHz TX Section CONTROL POWER TX RX I MODULE UNIT 4mVrms 1 13Vrms 0 047Vrms 0dBm 5 10dBm 0 4W 2 1 1 402 1406 25W 45W MIC ANT Does eee MIC VCO 018 X58 4360 XX y AF VTVM High frequency VTVM Wattmeter terminated by 500 1 AG is set so that MIC input becomes 3kHz DEV at 1kHz MOD 2 Transmitting frequency Center frequency iINVd9VIa 13 31 09 7 09 41 TK 760 762 CIRCUIT DESCRIPTION ANT N7 L208 Q208 L205 207 Q207 D20 24 BPF RF AMP BPF 1st MIX XF1 016 MCF 1st IF MX DET IF HOH 1st LOCAL OSC PLL DET IC2 2 2 EUR 12 AF 201 le 2nd LOCAL OSC IC11 1C405 2 2 IC AF PA SP AF De SW emphasis VOL UP DOWN Flg 2 Receiving system 2 5 Wide Narrow switch Each channel can be set as a wide or narrow channel by switching between CF201 CF WM455F Wide and CF202 CRWM455G Narrow The WIDE high signal and NARROW low signal are output from C10 I O port expansion 13 When the WIDE signal is output Q201 turns off and Q202 turns on When the NARROW signal is out put 0201 turns on and 0202 turns off WIDE H NARROW L NARROW H A high or low signal is output to D201 and D202 to s
14. CONDUCTOR DATA Port Name Function TXD RS 232C data output RXD RS 232C data input 4 19 DTMF decoder system clock STD DTMF decoder STD L DTMF signal absent DTMF signal present UP SMRQ E trunk step pulse Smartrunk ACK REQ TK 760 only E trunk sync pulse TK 760 only decoder data EEPROM serial data Gr Ee T9 EEPROM serial dock CH1 LED green L On Off TK 762 only CHIR TEST CH1 LED L p H Off TK 762 only LCD check mode L On Off TK 760 only MONG MON LED green L On H Off TK 762 only W N Wide Narrow Narrow Wide SMDI E trunk AUX mute Smartrunk serial data TK 760 only RST Reset XCI Sub clock XCO Sub clock XI Clock Clock GND External PTT L On H Off MDT L Data CH Normal CH External hook L On hook Off hook VOL up L On H Off VOL down L On H Off SCN L On H Off A L On H Off MON L On Off D A L On Off Dealer Test mode enter L NG OK DTMF microphone PTT L Off H Smartrunk power supply L Off H On TK 760 only Public address L Off On TK 760 only Microphone mute L Unmute Mute Audio control 1 Mute Unmute Scrambler binary data 1 Scrambler binary data 2 Scrambler L Off H On Smartrunk data ready TK 760 only E trunk COR TK 76
15. D 5 ME MIC GND D 3 IGN Ignition input D 1 DEO Detect output D 6 MI MIC input B 2 E GND B 3 SB DC supply 14 D 7 PTT PTT input D 4 DI Data mod input B 1 Horn Alert output D 8 50 Squelch output 1 SP Audio output E 1 AM Audio mute input 2 MIC mute input E 3 Signal indicating whether the transceiver is transmitting or not 1517 7 Refer to Terminal function on page 49 if need description in detail Connect CN5 of the radio to connector C of the KCT 19 instead of to the internal speaker connector if use external Speaker TK 760 762 INSTALLATION 2 Ignition Sense Cable KCT 18 Option The KCT 18 is an optional cable for enabling the igni tion function The ignition function lets you turn the power to the transceiver on and off with the car ignition key If you use the Horn Alert function you can turn the function off while driving with the ignition key 2 1 Connecting the KCT 18 to the transceiver 1 Install the KCT 19 in the transceiver See the KCT 19 section 2 Insert the KCT 18 lead terminal into pin of the square plug supplied with the KCT 19 then in sert the square plug into the KCT 19 connector 2 2 Modifying the transceiver Modify the transceiver as follows to turn the power or the Horn Alert function on and off with the ignition key 1 Remove the lower half of the transceiver case 2
16. TK 760 762 H SENWOOD SERVICE MANUAL 1996 5 PRINTED IN JAPAN B51 8327 00 N 1382 TK 760 H Microphone T91 0552 05 Cabinet Upper A01 2112 03 Panel assy Front glass Key top Rubber 62 0449 13 10 1230 04 K29 5081 02 TK 762 H Front glass B10 1252 04 Panel assy Key top Rubber A62 0450 13 K29 5081 02 760 762 H CONTENTS GENERAL erret ce o E E E E a Fe ra e i v Ere Re aT 3 SV STEM SET UP 5 OPERATING FEATURES 1 Transceiver Programming 3o reiner EU e ori ebat Du dne CE DOR EXE ER ERE pue vla lave e 6 INSTALLATION 1 Accessory Connection Cable KCT 19 Option 7 2 Ignition Sense Cable KCT 18 9 3 PAJHA Unit KAP 1 re i ce e engl vies E E 10 4 DTMF Decode 0 0 11 5 Pe eT Fia FUNT 12 6 Fitting the Control Panel Upside Down 4 1 12 REALIGNMENT SUBIT Sepia T
17. X unit The CPU 4 Turning the squelch on and off according to the has the following main functions pulse signal input from the squelch circuit 1 Switching between transmission and reception 5 Controlling the audio mute circuit according to in according to the PTT signal input put decode data 2 Reading channel frequency and program data 6 Sending encode data from the memory circuit 7 Sending data to the D A converter 411 6 1C401 2 2 0420 SHIFT 2 2 2 REGISTER Fig 10 Control section block diagram 24 760 762 CIRCUIT DESCRIPTION 6 1 Memory circuit C201 is a 8 Kbit EEPROM that stores adjustment and backup data Shift register IC10 is an interface IC for I O port expansion is used to expand the CPU 1C409 output ports D A converter IC6 is used as a conventional semi fixed resistor converter It sets the following 1 RX sensitivity 2 Transmission power 3 Modulation level 4 Audio power 5 Frequency 6 2 TX encode data The CPU 409 transmits encode data OT DOT DTMF DOT data items are output from CPU pin 16 The signa from this pin passes through the CR low pass filter and goes to the summing amplifier IC404 in the microphone amplifier DTMF data is output from CPU pin 10 This signal passes through the CR low pass filter and goes to 402 in the IDC circuit of the microphone amplifier These are mixed with the audio signal and output to th
18. ble entry point Secondly use your system s power supply which supplies the voltage and current required for your system Make sure sufficient air can flow around the radio and power supply to allow adequate cooling SERVICE This radio is designed for easy servicing Refer to the schematic diagrams printed circuit board views and alignment procedures contained in this manual Note When you modify your radio as described in system set up take the following precaution The rating of pin 7 SB of the accessory connector cable KCT 19 on the rear of the radio is 13 6V 1A Insert a 1A fuse if you use the SB pin for external equipment If you do not intend to use the 3 5 mm jack for the external speaker fit the supplied speaker jack cap B09 0235 XX to stop dust and sand getting in Speaker jack cap B09 0235 XX TK 760 762 SYSTEM SET UP Frequency range MHz RF Type Merchandise received Display LCD 148 174 32ch models TK 760 H 1962186 148 174 136 156 License and frequency allocated by FCC Frequency range MHz RF power 148 174 136 156 148 174 136 156 Display LED 2ch models TK 762 H Choose the type of transceiver See page 11 DTMF decoder Installation the control unit when used IC LC73881M SANYO Are you using the signaling Dealer option See page 6 pe
19. ction cable for connecting external equipment The connector has 15 pins and the necessary signal lines are selected for use 1 1 Installing the KCT 19 in the transceiver 1 2 Remove the upper and lower halves of the trans ceiver case and lift the DC cord bushing from the chassis Remove the pad Press the MON key on the master set The cA mark appears and data is sent from the master set to the slave set PC appears on the slave set to show that it is receiving data When cloning is complete the mark on the mas ter set disappears changes to END The slave set is automatically reset and enters user mode If cloning fails the master set shows ErrOr Re peat steps 4 and 5 If you wish to clone several sets switch each of them on and repeat 4 and 5 760 762 INSTALLATION 3 Insert the KCT 19 cable into the chassis 5 Connect the KCT 19 to the TX RX unit A 2 as The wire harness band must be inside the shown in Figure 2 chassis 6 Connect the KCT 19 to the external accessory by in 4 Relocate the DC cord bushing in the chassis serting the crimp terminal into the square plug both of which are supplied with the KCT 19 Contact square plug E09 1571 05 Crimp terminal E23 0613 05 Fig 2 1 2 Terminal function No B C D Name Function KAP 1 Instllated D 2 HK CHS MIC hook input Channel select
20. d secure and any open connectors are properly termi nated SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive at mosphere All equipment should be properly grounded before power up for safe operation his equipment should be serviced by a qualified technician only FCC COMPLIANCE AND TYPE NUMBERS Model and destination Frequency range MHz Deviation kHz Signaling 2 TONE DEC DTMF ENC TK 760 K 148 174 5 2 5 TK 760 K2 136 156 5 2 5 TK 762 K 148 174 5 2 5 TK 762 K2 136 156 5 2 5 760 148 174 5 2 5 760 K2 136 156 5 2 5 TK 762H K 148 174 5 2 5 TK 762H K2 136 156 ololololololololg 5 2 5 PRE INSTALLATION CONSIDERATIONS 1 UNPACKING Unpack the radio from its shipping container and check for accessory items If any item is missing please contact KENWOOD immediately 2 LICENSING REQUIREMENTS Federal regulations require a station license for each radio installation mobile or base be obtained by the equipment owner The licensee is responsible for en suring transmitter power frequency and deviation are within the limits permitted by the station license Transmitter adjustments may be performed only by a licensed technician holding an FCC first
21. e splatter filter It then goes to the D A converter IC6 and on to the VCXO and VCO 6 3 RX decode data QT DOT The receive detection signal passes through a low pass filter C412 1 2 to remove audio components This signal is input to pin 4 of the CPU The CPU digitizes this signal and decodes the sig nal 2 TONE Th receive detection signal pass through a low pass filter 401 1 2 This signal is input to pin 11 of the CPU DTMF DTMF decoding is made available by installing the DTMF decode IC LC73881M SANYO on the control board 6 4 PLL data output PLL data is output from DATA pin 60 ENABLE pin 73 and CLOCK pin 58 of the CPU IC209 The sig nals are input to the PLL IC IC202 when the channel is changed or when transmission is changed to reception and vice versa 6 5 Horn control The horn switch consisting of 013 014 and O24 controls the horn relay lt is supplied by the dealer to provide the external horn alert function Q24 disables horn alert turning on when its base Is high to inhibit the function Normally the output from IC10 is low and Q13 is off the base of Q14 is about OV and Q14 is off When horn alert is enabled the output from IC10 goes high and Q13 turns on The base cur rent flows through R61 to Q14 to turn 014 on 014 can sink a maximum of 100m4A If the optional KAP 1 is used it can drive up to 2A Horn control circuit Fig 11 6 6 PA switch If the
22. ed the TUNING Tuning mode start display MODE START display appears for about one second and the VERSION SELECT state becomes effective This state is different from the VERSION SELECT state in the TEST MODE in that the dot at the lower right side of the display lights Use the following keys to select a version D A UP SCN DOWN The version is backed up when the CH DOWN key is pressed as the version select key When the version is selected with the CH DOWN key the CH SELECT state of the tuning mode be comes effective The channel and signaling can be selected in the same way as in the test mode The tuning items are listed in Tables 5 and 6 and key operations for tuning are listed in Table 4 DOT Tuning item Tuning data Tuning mode channel select Tuning mode tuning Key Function Remarks Key Function Remarks VOL UP VOL up VOL UP VOL up VOL DOWN VOL down VOL DOWN VOL down CH UP To tuning To the right state To CH SEL To the left state CH DOWN N A CH DOWN Select To the next item MON C MON Item down O Item down MON AUX SCN Adjustment value down Adjustment value up 4 15 TK 60 762 16 Tuning item Tuning description Valid range REALIGNMENT Remarks Frequency 1 256 RF power 1 256 Three point adjustment RF power Low 1 256 Low RF power Center 1 256
23. eration When the CHANNEL DOWN key is pressed in the VERSION SELECT mode the version is backed up and a channel operation begins REALIGNMENT The channel frequencies for each version are listed in Table 3 and key functions for channel operations are listed in Table 2 Key Function VOL UP VOL UP VOL DOWN VOL DOWN CH UP MUTE OFF CH DOWN W N MON CH DOWN A CH UP SCN SIG DOWN D A SIG UP PTT TX Table 2 Frequency table for using on test mode K K2 CH RX F MHz TX F MHz RX F MHz TX F MHz 1 161 03000 161 00000 143 03000 143 00000 2 48 03000 148 00000 136 03000 136 00000 3 73 97000 174 00000 149 97000 150 00000 4 155 10000 155 10000 137 10000 137 10000 5 160 10000 160 10000 142 10000 142 10000 6 165 10000 165 10000 147 10000 147 10000 7 150 03000 150 00000 153 03000 153 00000 8 156 03000 156 00000 155 97000 156 00000 DEC signaling ENC signaling Remarks No No No OT 67 0Hz Rectangular wave 67 0Hz Signaling 151 4Hz 151 4Hz QT 210 7Hz 210 7Hz 023N 023N No DTMF 1633Hz Single tone No DTMF 852Hz 7 key 1209Hz 2 tone slow No 321 7Hz 928 1Hz CALL flashes if the signal matches DTMF No 159D CALL flashes if the signal matches Table 3 14 TK 760 762 REALIGNMENT 4 Panel Tuning Mode TK 760 Only When the tuning mode is enter
24. gy eie OUTPUT B 15 a OPEN DRAIN Bit Grabber Ren gt INTERNAL CONTROL 4 6 STAGE 12 STAGE A COUNTER COUNTER fin 11 64 65 MODULUS 10 PRESCALER CONTROL fin LOGIC 13 TEST2 TESTI SUPPLY CONNECTIONS PIN12 Vcc V TO INPUT AMP AND 64 65 PRESCALER PINS Veo PHASE FREQUENCY DETECTORS A AND PIN14 V TO BALANCE OF CIRCUIT PIN7 GND COMMON GROUND 29
25. optional KAP 1 is used see the separate sec tion for details the PA Public Address function be comes available In this case the signal flow changes as follows PA off For TX Q410 turns on and 0407 turns off The au dio signal from the microphone passes through O410 and IC6 and modulates the VCO For RX the detected signal passes through 404 which is on It then passes through the audio filter 403 IC405 D A IC IC6 and is output to the speaker through the audio power amplifier 11 PAon Since Q410 is off Q407 is on and 0404 is off the audio signal from the microphone goes to the audio filter C403 passes through IC6 and goes to IC11 The signal is output to the external system through the PA relay in the KAP 1 760 762 CIRCUIT DESCRIPTION 1C402 404 406 MIC AMP CPU 1 409 50 pin PA AUDIO POWER AMP SP INT SP EXT SP 10404 1 403 405 IC6 SW AUDIO OPTION Fig 12 PA switch circuit 6 7 Power supply circuit D4 protects IC1 against overvoltage Each time a pulse comes from the PSW terminal the IC1 output is reversed The reversed output signal passes through Q1 and and drives O4 A voltage must be applied to the IGN terminal If 24V is supplied to the transceiver by mistake Q2 turns on and and Q4 are forced off so the trans ceiver does not turn on Fig 13 Power supply circuit 26 TK 760 762 SEMICONDUCTOR DATA
26. ough the charge pump in 202 and the low pass filter of the lug lead to produce the control voltage for 5 02 VCO This voltage is applied to and D4 TX or D1 and D2 RX in the VCO unit to keep the VCO frequency constant The other output from O3 is amplified by the RF amplifier O18 and output to the transmit or receive unit via the RF switch D17 PLL DATA CK CLOCK DT DATA EP ENABLE Fig 6 PLL unit block diagram 4 2 PLL unlock When the PLL is unlocked the lock detect signal LD of the PLL IC 1C202 is rectified by D212 and con verted to a DC signal The CPU monitors this signal When the PLL is unlocked the CPU turns the key out put signal off low then turns O10 Q6 and 8T off to prevent unnecessary transmission D212 Fig 7 PLL unlock circuit 23 TK 760 762 CIRCUIT DESCRIPTION 5 Display Section 5 1 32 channel LCD model CPU 1 409 contains LCD driver to drive the 7 segment 8 digit LCD directly 5 2 2 channel LED model This model turns LED drive switches 0412 to 0418 on or off in response to the signal from the CPU to light LEDs D412 to D415 TO produce an orange light the green and red LEDs are turned on at the same time Fig 8 32 channels model display section Fig 9 2 channels model display section 6 Control Section The control section consists of CPU IC409 and its 3 Sending frequency data to the PLL peripheral circuits It controls the TX R
27. rsonal computer PC or compatible programming interface KPG 4 and programming software KPG 29D are required for programming The frequency and signaling option data are programmed for the transceiver YES KAP 1 See page 10 PA HA unit Installation the TX RX unit when used KAP 1 Option Are you using the public address lt o See page 12 YES KES 3 External speaker Option See page 7 See page 9 KCT 19 KCT 18 Are you using the ignition sense cable Ignition sense cable NO Are you using the external speaker Accessory connector cable Option Option TK 760 762 OPERATING FEATURES 1 Transceiver Programming 1 1 Introduction The TK 760 762 transceiver is programmed using an IBM PC or compatible machine a programming inter face KPG 4 and a programming disk KPG 29D Fig ure 1 shows the setup for an IBM PC Programming disk KPG 29D Programming interface KPG 4 1 2 KPG 4 Description Optional PC programming interface cable The KPG 4 is reeded to connect the TK 760 762 to the computer It has a circuit in the D subconnector 25 pin case that converts the RS 232C logic level to TTL level The KPG 4 plug is connected to external socket of the TK 760 762 and to the computer by a conversion cable option with a 9 pin female connec tor and a 25 pin male connector 1 3 Programming Software Description KPG 29D is the programming software for the TK
28. second or general class commercial radiotelephone operator s li cense There is no license required to install or operate the radio 3 PRE INSTALLATION CHECKOUT 3 1 Introduction Each radio is adjusted and tested before shipment However it is recommended that receiver and trans mitter operation be checked for proper operation be fore installation 3 2 Testing The radio should be tested complete with all cabling and accessories as they will be connected in the final installation Transmitter frequency deviation and power output should be checked as should receiver sensitivity squelch operation and audio output QT equipment operation should be verified 760 762 GENERAL 4 PLANNING THE INSTALLATION 4 1 General Inspect the vehicle and determine how and where the radio antenna and accessories will be mounted Plan cable runs for protection against pinching or crushing wiring and radio installation to prevent over heating 4 2 Antenna The favored location for an antenna is in the center of a large flat conductive area usually at the roof cen ter The trunk lid is preferred bond the trunk lid and vehicle chassis using ground straps to ensure the lid is at chassis ground 4 3 Radio The universal mount bracket allows the radio to be mounted in a variety of ways Be sure the mounting surface is adequate to support the radio s weight Al low sufficient space around the radio for air cooling Position
29. the radio close enough to the vehicle operator to permit easy access to the controls when driving 4 4 DC Power and wiring 1 This radio may be installed in negative ground elec trical systems only Reverse polarity will cause the cable fuse to blow Check the vehicle ground polar ity before installation to prevent wasted time and effort 2 Connect the positive power lead directly to the ve hicle battery positive terminal Connecting the Posi tive lead to any other positive voltage source in the vehicle is not recommended CAUTION If DC power is to be controlled by the vehicle ignition switch a switching relay should be used to switch the positive power lead The vehicle ignition switch then controls DC to the relay 3 Connect the ground lead directly to the battery negative terminal 4 The cable provided with the radio is sufficient to handle the maximum radio current demand If the cable must be extended be sure the additional wire is sufficient for the current to be carried and length of the added lead 5 INSTALLATION PLANNING CONTROL STATIONS 5 1 Antenna system Control station The antenna system selection de pends on many factors and is beyond the scope of this manual Your KENWOOD dealer can help you select an antenna system that will best serve your particular needs 5 2 Radio location Select a convenient location for your control station radio which is as close as practical to the antenna ca
30. witch between CF201 and CF202 Q204 turns R221 on or off to change the IC7 IF system detec tion output level for WIDE NARROW DET OUT d port expansion 13p WIDE H NARROW L Fig Wide Narrow switch 21 TK 760 762 CIRCUIT DESCRIPTION 3 Transmitter System 3 1 Microphone amplifier The signal from the microphone goes to the micro phone mute switch 0403 off It then passes through the high pass filter in 1 402 2 2 and the pre empha sis IDC circuit in IC402 1 2 The signal is applied to the 404 summing amplifier and mixed with and DOT from the CPU IC409 It then passes through the splatter filter the fourth low Q403 1C402 2 2 1C402 1 2 From Microphone DTMF pass filter consisting of 1 406 1 2 2 2 which re moves unwanted harmonics The output from the low pass filter is input to the D A converter IC6 to adjust the modulation IC6 changes the deviations of the wide and narrow chan nels 1 404 1406 2 2 1C406 1 2 MO D A Converter 6 OT DOT DATA Fig 4 Microphone amplification 3 2 Final amplifier The signal from the PLL is amplified by drive ampli 0205 206 and power module 501 to an out put level of 25W A45W and goes through the antenna switch D20 and harmonic filter and on to the antenna terminal C13 1 2 compares the DC input to pin 2 with the reference voltage at pin 3 applied by IC8 1 2 ampli fies the result
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