Kenwood TKR-750 Service Manual

Vhf fm repeater

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Page 1 B51-8556-20 ( N ) 1219 This service manual applies to products 60700001 or subsequent serial number. In terms of the products with the serial numbers earlier than 60700001, refer to the TKR-750 service manual as per part number B51-8556-10 and B51-8661-00.
Page 2: System Set-Up
TKR-750 GENERAL / SYSTEM SET-UP INTRODUCTION PERSONAL SAFETY SCOPE OF THIS MANUAL The following precautions are recommended for personal safety : This manual is intended for use by experienced techni- • DO NOT transmit until all RF connectors are secure and cians familiar with similar types of commercial grade commu- any open connectors are properly terminated.
Page 3: Operating Features
TKR-750 OPERATING FEATURES • “E2” is displayed when the channel data is not written. 1. Two 7-segment LED displays • Channel display (1~16) : While operating normally in user mode. • “E3” is displayed when PLL is unlocked. Receiver PLL unlocked = BUSY LED blinks.
Page 4: Realignment
User mode Use this mode for normal operation. The data can be input to or read from TKR-750 and edited on the screen. The programmed or edited data can be PC mode Use this mode to make various settings by printed out.
Page 5: Installation
3. Set the firmware to be updated by file name item. (Rear Connectors) 4. Turn the TKR-750 power on with the [PF1] key held down. This unit has two external power supply connectors : Main Hold the key down for one second until the 7-segment DC and Backup.
Page 6: Installation
CN606 (15-pin) on the rear of the radio is 4W/4Ω. Use external speaker KES-4 or KES-5. 3-1. Connection for the KES-4 or KES-5 With the TKR-750 CN605 ■ When taking the AF output from the TEST/ SPKR connector (15-pin) on the rear of the radio The following tools are required for changing the connec- tor.
Page 7 TKR-750 INSTALLATION Note : 4. Accessory Cabinet Relationship between TEST/SPKR connector (15-pin) con- You can install optional accessories, such as a DC power nection and speaker output. supply or duplexers in the accessory cabinet. When pins 9 and 12 are shorted : Built-in internal speaker is used.
Page 8: Modification
TKR-750 INSTALLATION / MODIFICATION 5. Key Cover 7. Installing Name Plates To avoid accidentally pressing the keys, you can install the Punch out the name plate card. Then insert the plates key cover. onto the reltative function keys. You can reconfigure the name plates at any time.
Page 9 3. Single Antenna If the external DC power supply is connected to the Main The TKR-750 can be used as a base station by sharing an DC connector and a backup battery (12V rechargeable type) is external antenna connector for both transmitting and receiv- connected to the Backup connector at the same time, the ing data.
Page 10: Disassembly For Repair
TKR-750 MODIFICATION / DISASSEMBLY FOR REPAIR 3-2. Connection DISASSEMBLY FOR REPAIR 1. Solder the prepared coaxial cable to the final unit. 2. Connect the pin connector of the coaxial cable to CN18 of 1. How to Remove the Panel Assy (ABS) the TX-RX unit.
Page 11: Circuit Description
2-1. Front-end Circuit 1. Outline The front-end circuit consists of BPF L2/L3, RF amplifier The TKR-750 is a VHF/FM repeater designed to operate in Q1, and BPF L5/L6/L7. The helical BPF covers frequency the frequency range of 136 to 174MHz.
Page 12 TKR-750 CIRCUIT DESCRIPTION 2-3. IF Amplifier 3. Transmitter Circuit The first IF signal is amplified by Q2 and Q3, and then en- The transmitter circuit consists of the following circuits : 3- ters IC9 (FM system IC). The signal is heterodyned again 1 microphone circuit, 3-2 modulation level adjustment circuit, with a second local oscillator signal (44.395MHz) with in IC9...
Page 13 TKR-750 CIRCUIT DESCRIPTION 3-3. Driver and Final Power Amplifier Circuit The transmit signal is generated by the TX VCO (A2), am- plified by Q11, and sent to final unit (X45-373). This amplified signal is amplified by Q2, Q3, and Q4, and is passed to the FINAL stage.
Page 14 TKR-750 CIRCUIT DESCRIPTION 4-2. Transmitter PLL 4. PLL Frequency Synthesizer The transmitter PLL circuit is located in VCO unit A2 (X58- The PLL frequency synthesizer circuit consists of the fol- 479) on TX-RX unit (X57-695 A/2), and consists of VCXO X3, lowing circuits : 4-1 receiver PLL circuit, 4-2 transmitter PLL VCO’s (Q350 and Q351), a single-chip PLL IC IC300, buffer...
Page 15 TKR-750 CIRCUIT DESCRIPTION 5-5. Display Circuit 5. Control Circuit The display circuit (X54-333) contains two 7-segment The control circuit mainly located in the control section of LEDs D506, D507 (orange), D503 (red : transmission), two- TX-RX unit (X57-695 B/2) consists of the following : 5-1 CPU,...
Page 16 TKR-750 CIRCUIT DESCRIPTION 5-6. DSP 5-7. Base-Band Circuit The DSP circuit filters transmit/receive audio signal and The base-band circuit switches between the modulation encode/decodes signaling (QT, DQT). This circuit consists of signal to the transmitter circuit, and remote audio and adjusts IC618, IC612, IC613, IC614, IC603, IC606, IC608, IC610, their levels.
Page 17 TKR-750 CIRCUIT DESCRIPTION 5-10. 5-tone* Decode IC604 checks the square wave frequency for the pres- The 300 to 3000Hz frequency characteristics of the signal that enters the comparator are made flat by the circuit, and ence of the required tone, and if the tone matches, IC604 the band is made into that band required to detect 5-tone performs the subsequent required processing.
Page 18: Semiconductor Data
TKR-750 SEMICONDUCTOR DATA Main CPU : 30622M4A-487GP (TX-RX unit IC604) ■ Pin Function Pin No. Name Function Pin No. Name Function Aux I/O No.5 (Acc D-sub 25 pin) – Not used Aux I/O No.4 (Acc D-sub 25 pin) HOLD –...
Page 19 TKR-750 SEMICONDUCTOR DATA DSP : 320VC5402PGE (TX-RX unit IC618) ■ Pin Function Pin No. Name Function Pin No. Name Function BDR0 Serial data receive input NC1,NC2 – Not used (No connection) HCNTL1 HPI control 1 – DVDD – VDD for I/O pins (+3.3V) BDR1 –...
Page 20: Components Description
TKR-750 SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION Final Unit (X45-373X-XX) Pin No. Name Function Ref. No. Part name Description EMU1/OFF Emulator 1 (to JTAG connector) DC amplifier Test data output (to JTAG connector) Thermostat Test data input (to JTAG connector) Voltage reguator...
Page 21: Components Description
TKR-750 COMPONENTS DESCRIPTION Ref. No. Part name Description Ref. No. Part name Description Shift register Q604 DC switch FM IF system Q605 Transistor Inverter IC10,11 Voltage regulator Q606 Transistor AF mute switch IC600 EEPROM Q607~609 Transistor DC switch IC601 Voltage detector...
Page 22: Parts List
TKR-750 PARTS LIST CAPACITORS 2 2 0 • Capacitor value CC45 Color* 010 = 1pF 0 = 22pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating 100 = 10pF 2 = Shape ... round, square, etc. 5 = Value...
Page 23 Les articles non mentionnes dans le Parts No. ne sont pas fournis. Y : AAFES (Europe) X : Australia M : Other Areas Teile ohne Parts No. werden nicht geliefert. TKR-750 (Y54-318X-XX) FINAL UNIT (X45-373X-XX) Desti- Desti- Ref. No. Address Parts No.
Page 24 TKR-750 PARTS LIST FINAL UNIT (X45-373X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C93-0603-05 CHIP C 1000PF L40-4775-34 SMALL FIXED INDUCTOR (47NH) CK73GB1H102K CHIP C 1000PF L40-6875-34 SMALL FIXED INDUCTOR (68NH)
Page 25 TKR-750 PARTS LIST FINAL UNIT (X45-373X-XX) DISPLAY UNIT (X54-3330-21) TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R92-1214-05 CHIP R 1/2W R505 RK73GB1J683J CHIP R 1/16W R92-1252-05...
Page 26 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation CC73GCH1H020C CHIP C 2.0PF C124,125 C92-1341-05 ELECTRO 100UF 16WV CC73GCH1H010C CHIP C 1.0PF C126,127 C92-0633-05 CHIP-TAN...
Page 27 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C681 C92-0546-05 CHIP-TAN 68UF 6.3WV C783 CK73GB1H471K CHIP C 470PF C684 CC73GCH1H101J CHIP C 100PF C784...
Page 28 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation A4-8 F11-0844-05 SHIELDING CASE RK73GB1J102J CHIP R 1.0K 1/16W F53-0217-05 FUSE RK73GB1J103J CHIP R 1/16W RK73GB1J333J...
Page 29 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R92-1252-05 CHIP R 0 OHM J 1/16W R637 R92-1252-05 CHIP R 0 OHM J 1/16W RK73GB1J472J CHIP R 4.7K...
Page 30 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R730 RK73GB1J101J CHIP R 1/16W R812 RK73GB1J223J CHIP R 1/16W R731 RK73GB1J472J CHIP R 4.7K 1/16W...
Page 31 TKR-750 PARTS LIST TX-RX UNIT (X57-695X-XX) RX VCO UNIT (X58-4780-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation IC611 NJM4558E MOS-IC RX VCO UNIT (X58-4780-10) IC612 TC7S04FU MOS-IC IC613 TC74VHC4040FT...
Page 32 TKR-750 PARTS LIST RX VCO UNIT (X58-4780-10) TX VCO UNIT (X58-4790-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R308 RK73GB1J560J CHIP R 1/16W C357 CK73GB1H102K CHIP C 1000PF R309...
Page 33 TKR-750 PARTS LIST TX VCO UNIT (X58-4790-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R370,371 RK73GB1J103J CHIP R 1/16W R372 RK73GB1J223J CHIP R 1/16W R373 RK73GB1J104J CHIP R 100K...
Page 34: Exploded View
TKR-750 EXPLODED VIEW : N09-2292-05 M2.6 x 6 : N30-2606-46 M4 x 6 : N30-4006-46 D M4 x 14 : N30-4014-46 M4 x 20 BLK : N30-4020-45 M3 x 6 (F) : N32-3006-46 G M4 x 8 (F) BLK : N32-4008-45...
Page 35 TKR-750 EXPLODED VIEW Kx14 35x2 A/2) Final (B/2) 47x2 Parts with the exploded numbers larger than 700 are not supplied.
Page 36: Packing
TKR-750 PACKING 52 Protection bag (H25-0029-04) 48 Cushion (G13-1801-04) 59 Foot (J02-0475-05) x 2 49 Cushion (G13-1802-04) 60 Foot (J02-0492-04) x 2 53 Protetion bag (H25-0747-04) 62 Grommet (J59-0302-05) x 2 61 Mounting hardware (J21-8402-04) C Pan head machine screw (N30-4006-46) x 2...
Page 37: Adjustment
To connect the TX-RX unit A/2 (CN14) to the TX-RX unit B/ MIC (WHT) 2 (CN602) while in servicing, you can use the 36-pin flat MICG (SHIELD) AF VTVM cable, E37-0979-05, which is available from the KENWOOD (BLU) parts center. PTT SW (BLK)
Page 38 TKR-750 ADJUSTMENT Test Channel (Default) Test Signaling Decode tone Encode tone None None 146.10 146.00 136.10 136.00 None 100Hz square wave 160.10 160.00 143.10 143.00 QT 67.0Hz QT 67.0Hz 173.90 174.00 149.90 150.00 QT 151.4Hz QT 151.4Hz 150.10 150.00 146.10 146.00...
Page 39 (KPG-91D) for details. frequency of the channel to be used by the TKR-750. 3. Check whether the frequency rewritten under the “Test mode” of the FPU (KPG-91D) is correct, then select the...
Page 40 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.1V 5. TX PLL lock 1) TX VCO A high TX-RX TX-CV TX VCO TC350 1.50V voltage CH : 11 (A/2) (A2) 2) TX VCO A low...
Page 41 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 16. MCF 1) Connect the TG to CN2, then Tracking Rear RX ANT TX-RX L14 Adjust it to look like (Wide) connect CN4 to the spectrum generator (A/2) the wave Fig.
Page 42 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 20mV 21. RA outut 1) Connect SSG to RX ANT. Rear RX ANT PC adj. level CH : 2 (Wide) 400mV (Wide) SSG output : –53dBm/501µV...
Page 43 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.05kHz 25. DQT 1) VCO-A CH (TX VCO A center) MOD ANA Rear TX ANT PC adj. deviation VCO-B CH (TX VCO B center) or 0.75kHz...
Page 44 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.1kHz 30. DTMF 1) VCO-A CH (TX VCO A center) MOD ANA Rear TX ANT PC adj. deviation VCO-B CH (TX VCO B center) or 3.0kHz...
Page 45 TKR-750 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.1kHz 35. Repeat 1) VCO-A CH (TX VCO A center) SSG Rear RX ANT PC adj. gain level VCO-B CH (TX VCO B center) 1kHz (Wide) SSG output : –53dBm...
Page 46: Terminal Function
TKR-750 TERMINAL FUNCTION Final Unit (X45-373X-XX) Connector Terminal Terminal I/O Terminal function Name Connector Terminal Terminal I/O Terminal function Name STB1 Strobe data for shift register TX driver input signal (Coaxial) Clock data input Serial data input O High temperature detector signal...
Page 47 TKR-750 TERMINAL FUNCTION Connector Terminal Terminal I/O Terminal function Connector Terminal Terminal I/O Terminal function Name Name Enable input for RX PLL – No Connection Enable input for TX PLL display O Serial data output O Lock detector for RX PLL...
Page 48 TKR-750 TERMINAL FUNCTION Connector Terminal Terminal I/O Terminal function Connector Terminal Terminal I/O Terminal function Name Name O Latch data output for DA converter I/O Programable I/O 1 RF power down signal input – Control line ground O Strobe output for shift register –...
Page 49 TKR-750 TERMINAL FUNCTION Connector Terminal Terminal I/O Terminal function Connector Terminal Terminal I/O Terminal function Name Name 8V input through the ripple filter Speaker mute signal input “L”: Mute on RX PLL lock voltage No connection 9V input through the ripple filter...
Page 50: Interconnection Diagram
TKR-750 INTERCONNECTION DIAGRAM CN605 INT SP TX-RX UN TX-RX UNIT B/2 X57-695*-** X57-695 CN602 DISPLAY UNIT A/2 X54-333*-** 1.8C 1.8V AVR 8V AV 3.3D 3.3V AVR 5V AVR 8CT(8C) 8V AV CN600 5V AVR 5V AVR 5V AVR 3.3V AVR 3.3A...
Page 51 TKR-750 INTERCONNECTION DIAGRAM CN18 RX ANT TX-RX UNIT A/2 X57-695*-** MAIN DC CN15 MAIN DC – BACKUP BATTERY BACKUP – 8V AVR 5V AVR FINAL UNIT B/2 CN16 X45-373*-** 8V AVR 5V AVR FINAL UNIT A/2 X45-373*-** 9V AVR CN19...
Page 52 CN605 CN18 RX ANT INT SP TX-RX UNIT B/2 TX-RX UNIT A/2 X57-695*-** X57-695*-** MAIN DC CN15 MAIN DC – CN602 DISPLAY UNIT A/2 BACKUP BATTERY BACKUP – X54-333*-** 1.8C 1.8V AVR 8V AVR 3.3D 3.3V AVR 5V AVR FINAL UNIT B/2 CN16 X45-373*-** 8CT(8C)
Page 53 TKR-750 PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Component side view (J72-0910-19) CN8 GND CN6 MAIN DC (BLACK) (RED) CN7 BACKUP (ORANGE) Back up battery Main DC C118 CHARGE FAB 1 C106 C143 TX IN J72-0910-19 (B/2) Ref.
Page 54: Pc Board Final Unit (X45-373X-Xx)
TKR-750 PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Component side view (J72-0910-19) J72-0910-19 (A/2) C164 C118 C165 C173 CN53 ANT SW Component side Layer 1 Layer 2 Layer 3 Layer 4 Foil side...
Page 55 TKR-750 TKR-750 PC BOARD PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Component side view (J72-0910-19) Component side view (J72-0910-19) J72-0910-19 (A/2) CN8 GND CN6 MAIN DC (BLACK)
Page 56 TKR-750 PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Foil side view (J72-0910-19) J72-0910-19 (A/2) C174 Ref. No. Address Ref. No. Address Ref. No. Address...
Page 57 TKR-750 PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Foil side view (J72-0910-19) C103 C168 Back up battery Main DC C108 C109 C110 J72-0910-19 (B/2) Component side Layer 1 Layer 2 Layer 3 Layer 4 Foil side...
Page 58 TKR-750 TKR-750 PC BOARD PC BOARD FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 FINAL UNIT (X45-373X-XX) 0-10 : K,E 0-11 : K2 Foil side view (J72-0910-19) Foil side view (J72-0910-19) J72-0910-19 (A/2) C103 C168 Back up battery Main DC...
Page 59: Display Unit (X54-3330-21)
TKR-750 PC BOARD DISPLAY UNIT (X54-3330-21) Component side view (J72-0756-12) VR601 J601 IC504 D503 J72-0756-12 B/2 S501 S503 S504 S502 Q512...
Page 60 TKR-750 PC BOARD DISPLAY UNIT (X54-3330-21) Component side view (J72-0756-12) J72-0756-12 A/2 S507 POWER D505 D507 D506 MAIN BACK- IC504 IC505 D504 BUSY Component side S505 S506 Layer 1 Layer 2 Foil side Q514 Ref. No. Address IC504 IC505 Q512...
Page 61 TKR-750 TKR-750 PC BOARD PC BOARD DISPLAY UNIT (X54-3330-21) Component side view (J72-0756-12) DISPLAY UNIT (X54-3330-21) Component side view (J72-0756-12) J72-0756-12 A/2 VR601 S507 POWER D505 D507 D506 MAIN BACK- J601 IC504 IC505 D503 D504 BUSY J72-0756-12 B/2 Component side...
Page 62 TKR-750 PC BOARD DISPLAY UNIT (X54-3330-21) Foil side view (J72-0756-12) J72-0756-12 A/2 CP504 CP502 CP503 CP501 BACKUP MAIN DC R543 R606 R517 Q525 Q507 Q504 Q509 R538 BUSY R518 Q503 D508 D509 C516 C517 R525 C526 Component side C518 D502...
Page 63 TKR-750 PC BOARD DISPLAY UNIT (X54-3330-21) Foil side view (J72-0756-12) CN601 C606 C603 C602 D602 D601 R601 J72-0756-12 B/2 CN502 C513 R522 C508 R511 R512 R529 R513 Q513 R533 IC501...
Page 64 TKR-750 TKR-750 PC BOARD PC BOARD DISPLAY UNIT (X54-3330-21) Foil side view (J72-0756-12) DISPLAY UNIT (X54-3330-21) Foil side view (J72-0756-12) J72-0756-12 A/2 CN601 C606 C603 C602 CP504 CP502 D602 D601 CP503 CP501 BACKUP MAIN DC R601 R543 R606 R517 Q525...
Page 65: Tx-Rx Unit (X57-695X-Xx) (A/2)
TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 A/2) CN18 CN15 NARROW WIDE R197 CN14 Ref. No. Address Ref. No. Address Ref. No. Address IC10...
Page 66 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 A/2) CN16 CN19 GND2 GND1 TP102 TX CV A2 : TX VCO (X58-479) C137 C139 C212 C213 R110 R112 GND2...
Page 67 TKR-750 TKR-750 PC BOARD PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 A/2) Component side view (J72-0923-19 A/2)
Page 68 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 A/2) GND2 R106 C127 R148 R159 C129 R121 C167 C123 GND1 C120 R122 C131 R151 C219 + R152 R153 R130...
Page 69 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 A/2) C214 C199 C198 C65 + R161 C197 R150 C163 C155 C154 + C218 R176 C72 + Component side Layer 1...
Page 70 TKR-750 TKR-750 PC BOARD PC BOARD TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E TX-RX UNIT (X57-695X-XX) (A/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 A/2) Foil side view (J72-0923-19 A/2)
Page 71: Tx-Rx Unit (X57-695X-Xx) (B/2)
TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 B/2) CN600 C806 L606 IC627 5-TONE C826 3.3D D600 C785 L601 R836 L604 Q612 C613 R603 IC601 C646 C691 TRST GND NC GND GND GND EMU1...
Page 72 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 B/2) C800 CN610 R781 CN609 C817 C789 IC629 CP600 L607 IC630 C801 CP601 C795 C798 C814 R654 C811 CN603 C803...
Page 73 TKR-750 TKR-750 PC BOARD PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Component side view (J72-0923-19 B/2) Component side view (J72-0923-19 B/2)
Page 74 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 B/2) C784 CN602 C787 R754 Q606 R762 C783 D627 Q611 Q609 C791 R811 R767 C815 R802 R745 C764 R844 R668...
Page 75 TKR-750 PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 B/2) Q601 Q602 IC632 R832 C836 IC631 R831 R828 R818 C838 C837 R819 R826 C842 C833 R616 X600 R606 IC600...
Page 76 TKR-750 TKR-750 PC BOARD PC BOARD TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E TX-RX UNIT (X57-695X-XX) (B/2) 0-11 : K 0-12 : K2 2-70 : E Foil side view (J72-0923-19 B/2) Foil side view (J72-0923-19 B/2)
Page 77: Rx Vco Unit (X58-4780-10)
TKR-750 PC BOARD RX VCO UNIT (X58-4780-10) RX VCO UNIT (X58-4780-10) Component side view (J72-0749-02) Foil side view (J72-0749-02) J72-0749-02 A/2 J72-0749-02 A/2 C379 R368 C377 L362 R360 R366 R361 R363 C378 R356 R357 Q353 R367 R364 L360 C374 R359...
Page 78: Tx Vco Unit (X58-4790-10)
TKR-750 PC BOARD TX VCO UNIT (X58-4790-10) TX VCO UNIT (X58-4790-10) Component side view (J72-0750-12) Foil side view (J72-0750-12) J72-0750-12 A/2 J72-0750-12 A/2 C379 R368 C377 L362 R360 R366 R361 R363 C378 R356 R357 Q353 R367 R364 L360 L361 C373...
Page 79: Schematic Diagram
TKR-750 SCHEMATIC DIAGRAM FINAL UNIT (X45-3730-XX) (A/2) T:8.04V R:0V T:7.84V R:0V 350mW C143 1000p 1000p 1000p 2SC3357 2SC3356 (R24) THERMAL T:1.15V T:0.73V SENSE R:0V R:0V Q2,3 1SS226 RF AMP DC SWITCH SURGE VOLTAGE ABSORPTION 2SC4116(Y) THERMOSTAT REGULATOR T:13.02V 100k R:13.65V...
Page 80 TKR-750 SCHEMATIC DIAGRAM FINAL UNIT (X45-3730-XX) (A/2) 3.0A C160 1000p 120p TX ANT 1000p 1000p DRIVE FINAL AMP 100k 100k RF SWITCH D4,5 RF DETECTOR MA4PH633 T:5.18V VOLTAGE R:0V REFERENCE DC AMP TA75W01FU IN2+ 1000p IN2- IN1+ 100k OUT-B IN1-...
Page 81 FINAL UNIT (X45-3730-XX) (A/2) 3.0A T:8.04V R:0V T:7.84V R:0V C160 350mW 1000p C143 120p TX ANT 1000p 1000p 1000p 1000p 1000p 2SC3357 2SC3356 (R24) DRIVE FINAL AMP 100k 100k THERMAL D4,5 RF SWITCH T:1.15V T:0.73V SENSE R:0V R:0V RF DETECTOR MA4PH633 T:5.18V Q2,3...
Page 82 TKR-750 SCHEMATIC DIAGRAM Note : The components marked with a dot ( • ) are parts of layer 1. DISPLAY UNIT (X54-3330-21) (A/2) D506 CP501 LA-501DD 470*4 S506 7SEGMENT S501 S502 S503 S504 S505 C519 0.01u SHIFT REGISTER Q517 UPA672T...
Page 83 TKR-750 SCHEMATIC DIAGRAM DISPLAY UNIT (X54-3330-21) (A/2) D507 CP503 CP504 CP502 LA-501DD 470*4 470*4 470*4 7SEGMENT DC SW C520 0.01u SHIFT Q518 Q521 REGISTER UPA672T UPA672T DC SW DC SW Q’S DC SW Q519 UPA672T DATA DC SW VOLTAGE REGULATOR...
Page 84 DISPLAY UNIT (X54-3330-21) (A/2) D506 D507 CP501 CP502 CP503 CP504 LA-501DD LA-501DD 470*4 470*4 470*4 470*4 S506 7SEGMENT 7SEGMENT S501 S502 S503 S504 S505 DC SW C519 0.01u C520 0.01u SHIFT SHIFT Q518 Q521 REGISTER REGISTER UPA672T UPA672T Q517 DC SW DC SW UPA672T DC SW...
Page 85 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (A/2) A2 SUB UNIT (TX VCO/PLL) (X58-4790-10) R368 D354 CN351 BUFFER L352 MODULATION TX-VCOL R351 Q355 2SC4215(Y) C379 Q350 -2.7dBm 2SK508NV(K52) FREQUENCY TX-CV CONTROL R359 C374 (TP102) L353 D352 C356 C366 C368 R353 DC SW...
Page 86 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (A/2) A3 SUB UNIT (RX VCO/PLL) (X58-4780-10) R368 L352 CN351 R351 BUFFER R354 -6.2dBm Q355 V-RXVCOL 2SC4215(Y) C379 C368 FREQUENCY RX-CV CONTROL (TP101) R359 C374 VCO OSC Q350 R160 L353 D352 C356 2SK508NV(K52) DC SW...
Page 87 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (A/2) R144 C164 470p TX SW 0.31V T:8.05V T:1.04V DC SW DC SW 2SB1132(Q,R) B:1.51V R:0V 2SB1386(R) DAN235K R:0V 7.78V E:0.75V C:6.35V R106 T:0V R:1.03V R129 R130 R159 2SC3120 DC SW DC SW DC SW...
Page 88 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (A/2) E04-0154-05 +0.8dBm CN19 FINAL UNIT (X45-3730-XX) (A/2)-CN1 SHIFT CONVERTER REGISTER CN15 M62354GP BU4094BCF E40-5703-05 FINAL UNIT STRB (X45-3730-XX) (A/2)-CN5 DATA CN16 E40-5632-05 FINAL UNIT (X45-3730-XX) (A/2)-CN3 Q’S CN14 E40-6009-05 S76-0401-05 220mV DC SW...
Page 89 TX-RX UNIT (X57-695X-XX) (A/2) +0.8dBm E04-0154-05 R144 CN19 FINAL UNIT TX SW C164 470p A2 SUB UNIT (TX VCO/PLL) (X58-4790-10) A3 SUB UNIT (RX VCO/PLL) (X58-4780-10) (X45-3730-XX) 0.31V (A/2)-CN1 T:8.05V T:1.04V B:1.51V DC SW 2SB1132(Q,R) R:0V DC SW 2SB1386(R) SHIFT DAN235K R:0V 7.78V...
Page 90 TKR-750 SCHEMATIC DIAGRAM Note : The components marked with a dot ( • ) are parts of layer 1. TX-RX UNIT (X57-695X-XX) (B/2) SURGE PROTECTOR D600 DA204U CN600 E40-6102-05 R605 BATT C600 100k 0.1u STB1 STB1 PTT/TXD1 TXD1 VOLTAGE DETECTOR...
Page 91 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (B/2) 5.05V R814 R659 R660 R661 CP613 1k*2 KEY4 KEY4 R817 3.20V KEY5 KEY5 5TONE CP620 CP614 1k*2 100*2 EMON EMON R662 R618 BYTE CNVSS CNVss CP603 100*2 CP615 10*4 RESET RESET XOUT R629...
Page 92 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (B/2) L606 L607 10u10 C754 470p C749 NC18 C750 0.01u NC17 CVDD7 R691 HCNTL0 HCNTL0 VSS6 BCLK BCLKR0 BCLKR1 BFSR0 LRCK BFSR1 BDR0 SDT0 R692 HCNTL1 HCNTL1 R813 BDR1 BCLKX0 BCLK C759 470p MCLK...
Page 93 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (B/2) AMPSW AMPSW 5V AVR IC624 IC627 XC62FP1802P TA78L05F 1.82V 5.06V 8.00V 1.8V AVR 1.8C VOUT OUTX INVERTER IC625 IC628 IC621 3.3V AVR XC62FP3302P TA78L05F 3.32V 5.02V TC7S00FU 5V AVR NAND GATE 3.3D VOUT...
Page 94 TKR-750 SCHEMATIC DIAGRAM TX-RX UNIT (X57-695X-XX) (B/2) C783 470p 13.10V 13.10V AMPSW Q610 2SJ506(S) DC SW DC SW 1.20V Q611 IC629 LA4422 DTC114EUA AUDIO AMP Q609 DTC114EUA CURRENT DC SW PROTECTOR D627,628 REVERSE CURRENT PROTECTOR C814 C787 C811 1000u25 R758...
Page 95 TX-RX UNIT (X57-695X-XX) (B/2) 5.05V C783 470p 13.10V SURGE 13.10V AMPSW AMPSW PROTECTOR AMPSW Q610 2SJ506(S) D600 DC SW DA204U IC624 IC627 5V AVR DC SW 1.20V CN600 1.82V XC62FP1802P 1.8V AVR 5.06V TA78L05F 8.00V Q611 IC629 LA4422 E40-6102-05 L606 1.8C DTC114EUA VOUT...
Page 96: Block Diagram
TKR-750 BLOCK DIAGRAM TX-RX unit (CONTROL) X57 CN605 INT SP CN604 DAT,CLK,SOE RSSI Display unit Shift Reg. X54-333 (B/2) TEST/SPKR IC623 MIC JACK VR601 A01~5 BU4094BCF AF VOL D626 PTT/TXD CN603 MINISMDE190 D603 HK/RXD CN601 Display unit CN501 X54-333 (A/2)
Page 97 TKR-750 BLOCK DIAGRAM X-RX unit (CONTROL) X57-695 (B/2) IC624 XC62FP1802P 1.8V 1.8C IC625 IC628 XC62FP3302P TA78L05F 3.3V IC622 Q606 3.3D DTC363EK TC7S66FU AF AMP IC626 IC630 IC629 MUTE DAT,CLK,SOE,STB2 TA78L05F XC62FP3302P RSSI LA4422 RSSI 3.3V 3.3A Q605 Q610 DTC114EUA Shift Reg.5...
Page 98 TKR-750 BLOCK DIAGRAM TX-RX unit X57-695 (A/2) 44.850MHz RF AMP MCF(W) DAN235K DAN235K L5,6,7 2SC357 L2,3 CN18 RX ANT IF AMP IF AMP CN14 2SC3357 2SC3120 RX VCO 2SC3356(R24) 2SC3357 MCF(N) VCOA FM IC 9CLR IC9 : TK14489V VCOB RSSI...
Page 99: Kes-5 (External Speaker)
TKR-750 KES-5 (EXTERNAL SPEAKER) When Using an External Speaker 1. Make sure the unit’s power is tuned off. 2. When using the external speaker, remove the jumper lead from the connector, and attach the speaker cable. 3. When not using the external speaker, replace the jumper lead and insert the connector into the speaker jack (pin9 and 12).
Page 100: Specifications
TKR-750 SPECIFICATIONS (K,K2 TYPE) GENERAL Frequency Range ........ K : 146 to 174MHz K2 : 136 to 150MHZ Number of Channels ......16 channel Channel Spacing ......... Wide : 30kHz, 25kHz Narrow : 15kHz, 12.5kHz (PLL channel stepping 2.5kHz/5kHz/6.25kHz) Operating Voltage ....... 13.6V DC± 15% (10.8~15.6V) Current Drain Standby ..........
Page 101 Unit 3712-3724, Level 37, Tower one Metroplaza, 223 Hing Fong Road, KENWOOD ELECTRONICS U.K. LIMITED Kwai Fong, N.T., Hong Kong KENWOOD House, Dwight Road, Watford, Herts., KENWOOD ELECTRONICS SINGAPORE PTE LTD. WD18 9EB United Kingdom 1 Ang Mo Kio Street 63, Singapore 569110...

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