HYT TC-618 Service Manual
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HYT TC-618 Service Manual

HYT TC-618 Service Manual

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Summary of Contents for HYT TC-618

  • Page 2: Table Of Contents

    Radio Overview ............................ 4 Software Specifications ........................7 Circuit Description ..........................11 CPU Pins ............................. 19 TC-618/626 Parts List 1 ........................22 Adjustment Description ........................71 Troubleshooting Flow Chart ......................83 Disassembly and Assembly for Repair .................... 86 Exploded View ............................ 89 TC-618/626 Parts List 2 ........................

  • Page 3: Introduction

    TC-618/626 Service Manual Introduction Manual Scope This manual is intended for use by experienced technicians familiar with similar types of communication equipment. It contains all service information required for the equipment and is current as of the publication date.

  • Page 4: Safety Information

    ◇ This radio shall be serviced by qualified technicians only. ◇ Only use HYT supplied or approved batteries and chargers. ◇ To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any area where posted notices instruct you to do so. Turn off your radio before boarding an aircraft.

  • Page 5: Radio Overview

    TC-618/626 Service Manual Radio Overview TC-618 (Push-to-Talk) SK1 (Side Key SK2 (Side Key 2) Speaker Microphone Antenna LED Indicator Channel Selector Knob Radio On-Off/Volume (10) (11) (12) Battery Latch Accessory Jack Accessory Jack Cover Control Knob (13) (14) (15) (16)
  • Page 6 TC-618/626 Service Manual TC-626 (Push-to-Talk) SK1 (Side Key 1) SK2 (Side Key 2) Speaker Channel Selector Microphone Antenna LED Indicator Knob (9) Radio On-Off/Volume (12) Accessory Jack (10) (11) Battery Latch Accessory Jack Control Knob Cover (13) (14) (15) (16)
  • Page 7 TC-618/626 Service Manual Status indications and alert tones are shown in the table below: Operations/Functions LED Indications and Alert Tones To enter Wired Clone mode (For the source radio, hold down The LED on the source radio flashes orange once SK2 while powering it on;...

  • Page 8: Software Specifications

    TC-618/626 Service Manual Software Specifications Description of Features 1. Channel Capacity: 16 2. Channel Spacing: 25KHz/12.5KHz 3. Channel Step: 5/6.25/10/12.5KHz 4. Channel Scan 5. Tx/Rx Status Indication (red/green LED) 6. CTCSS/CDCSS Encode & Decode (38 groups of standard CTCSS; 83 groups of standard CDCSS;...
  • Page 9 TC-618/626 Service Manual powering it on, and the radio enters User Clone Mode in 2 seconds. The target radio can be directly turned on to enter the mode. In this mode, parameter data stored in EEPROM of the source radio will be cloned to EEPROM of the target radio. The data transferred only covers channel data and common parameters, excluding adjustment data, version and serial No.
  • Page 10 TC-618/626 Service Manual group. If the LED glows red, Tx group is entered; if the LED glows green, Rx group is entered. The LED solidly glows red for adjustment of Tx group items. The LED solidly glows green for adjustment of Rx group items.
  • Page 11 TC-618/626 Service Manual Rx group: CH1~CH7 respectively stand for SQL On 1, SQL On 5, SQL On 9, SQL Off 1, SQL Off 5, SQL Off 9 and Rx Low Voltage Threshold. These adjustment items are related to AD sampling. Press SK1 or SK2 after entering the above items, to activate AD sampling (including calculation) once.

  • Page 12: Circuit Description

    TC-618/626 Service Manual Circuit Description Realization Methods of Basic Functional Modules PLL Frequency Synthesizer The PLL circuit mainly provides the local oscillator signal for Rx and RF carri er signal for Tx. It is composed of VCO and baseband processor, allowing frequency tracking and channel switching under the control of MCU signals.
  • Page 13 TC-618/626 Service Manual The switching diode Q652 performs switching between transmission and reception under the control of T/R: in Tx mode, T/R is set to low level and Q653 becomes conductive, making Q100 operate; in Rx mode, T/R is set to high level and Q653 is cut off, making Q101 operate. The output from Q100 and Q101 is amplified by Q102 and then feeds to the buffer amplifier for further processing.
  • Page 14 TC-618/626 Service Manual amplification. Then the amplified signals feed to the three-stage bandpass circuit (mainly composed of D505, D506, D507 and peripheral components) to effectively reject out-of-band interference and to obtain pure RF signals. Finally, the signals go to the mixer circuit.
  • Page 15 TC-618/626 Service Manual MCU outputs appropriate PWM waveform according to the selected channel. The waveform is then rectified by the RC filter circuit (R441, R442, C440 and C441) to generate level of APC/TUNE control signal. One flow of APC/TUNE control signals go to R500 to be used as control voltage of the Rx electrically tunable circuit.
  • Page 16 TC-618/626 Service Manual 2） Block diagram of Rx audio & signaling processing circuit CF302 450KHz+/4.5K To MCU IFAmp1 SPVCC DATA U200 RSSI IFAMP2 POWERREG LATCH AN29160AA mix2 volume PROCESSER mute VREF Mic amp 5th-HPF sp Amp (TX) tone-LPF mic mute...
  • Page 17 TC-618/626 Service Manual 6. MCU Control Circuit The block diagram of the MCU control circuit is shown in the figure below. MCU operates on the clock frequency of 7.3728MHz. U609 AT24 C6 4 CHANNEL SW 1.VOX 2.BUSY_DET 3.BEEF/CALL 4.T/R 5.SAVE...

  • Page 18: Power Management

    TC-618/626 Service Manual To detect VOX ON level; To detect low voltage alarm; To detect enabling and distinguishing of external earpiece. Data Transmission and Processing: To initiate EEPROM data; To transmit programming data; To process the code of Channel Selector knob.
  • Page 19 TC-618/626 Service Manual 8. VOX Realization Circuit The block diagram is shown in the figure below: Q202 VCC_5V 2SA1832 R206 1K EXPTT R207 R208 C212 100K R205 0.1U R204 470 C213 MIC_EN Q201 2SK1824 C260 R202 100 220P C274 R203 R251 0.01U...

  • Page 20: Cpu Pins

    TC-618/626 Service Manual CPU Pins Pin No. Port Name TC-618 TC-626 Function For input from the A/D power supply; AVcc connected with the power supply. For input of A/D reference signal; connected with the power supply. For input from PTT (connected with PE3/INT13 pull-up resistor) (valid at low level).
  • Page 21 TC-618/626 Service Manual To output Enable signal to PLL. P04/INT04 PLLEN2 PLLEN2 To output data signal to PLL. P05/INT05 PLLDATA PLLDATA To output clock signal to PLL. P06/INT06 PLLCLK2 PLLCLK2 For detection of TB31202 PLL circuit P07/INT07 (H: locked; L: unlocked) (connected with pull-up resistor).
  • Page 22 TC-618/626 Service Manual To output red indication. P41/AN09 RLED RLED To output green indication. P40/AN08 GLED GLED Reserved. P37/AN07 Reserve Reserve Reserved. P36/AN06 Reserve Reserve For input of CTCSS/CDCSS. P35/AN05 I/AD For input of busy channel detection. P34/AN04 BUSY BUSY I/AD For input of battery voltage detection.

  • Page 23: Tc-618/626 Parts List 1

    TC-618/626 Service Manual TC-618/626 Parts List 1 TC-618/626 (136-174MHz) Parts List 1 Material No. Description Qty. Ref No. Print No. 1 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) C222 2 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R103 3 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R117 4 3001050000000 Chip resistor 0402 0Ω...
  • Page 24 TC-618/626 Service Manual 50 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R301 51 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R302 52 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R400 53 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R436 54 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R504 55 3001051030000 Chip resistor 0402 10KΩ...
  • Page 25 TC-618/626 Service Manual 104 3001062710000 Chip resistor 0603 270Ω J 1/10W(RoHS) R419 105 3001052220000 Chip resistor 0402 2.2KΩ J 1/16W(RoHS) R201 106 3001052220000 Chip resistor 0402 2.2KΩ J 1/16W(RoHS) R235 107 3001052220000 Chip resistor 0402 2.2KΩ J 1/16W(RoHS) R438 108 3001052230010 Chip resistor 0402 22KΩ J 1/16W(RoHS) R214 109 3001052230010 Chip resistor 0402 22KΩ...
  • Page 26 TC-618/626 Service Manual 158 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R262 159 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R268 160 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R304 161 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R305 162 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R402 163 3001054730000 Chip resistor 0402 47KΩ...
  • Page 27 TC-618/626 Service Manual 212 3101051000020 Chip capacitor 10PF J 50V C0G 0402(RoHS) C322 213 3101051000020 Chip capacitor 10PF J 50V C0G 0402(RoHS) C449 214 3101051000020 Chip capacitor 10PF J 50V C0G 0402(RoHS) C505 215 3101051000020 Chip capacitor 10PF J 50V C0G 0402(RoHS)
  • Page 28 TC-618/626 Service Manual 266 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402(RoHS) C259 267 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402(RoHS) C274 268 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402(RoHS) C276 269 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402(RoHS) C277 270 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402(RoHS)
  • Page 29 TC-618/626 Service Manual 320 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C687 321 3101051050000 Chip capacitor 1UF K 6.3V X5R 0402(RoHS) C202 322 3101051050000 Chip capacitor 1UF K 6.3V X5R 0402(RoHS) C203 323 3101051050000 Chip capacitor 1UF K 6.3V X5R 0402(RoHS) C208 324 3101051050000 Chip capacitor 1UF K 6.3V X5R 0402(RoHS)
  • Page 30 TC-618/626 Service Manual 374 3101053910000 Chip capacitor 0402 390PF J 50V(RoHS) C228 375 3101053910000 Chip capacitor 0402 390PF J 50V(RoHS) C234 376 3101053920000 Chip capacitor 0402 3900PF K 25V(RoHS) C679 377 3101054700010 Chip capacitor 47PF J 50V COG 0402(RoHS) C280...
  • Page 31 TC-618/626 Service Manual 428 3101056830000 Chip capacitor 0402 0.068UF K 6.3V(RoHS) C227 429 3101052700000 Chip capacitor 27PF J 50V C0G 0402(RoHS) C141 430 3101052700000 Chip capacitor 27PF J 50V C0G 0402(RoHS) C504 431 3101052700000 Chip capacitor 27PF J 50V C0G 0402(RoHS)
  • Page 32 TC-618/626 Service Manual 482 3213306221010 Multi-layer chip inductor 0603 0.22uH MLF1608(RoHS) L607 483 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L109 484 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L110 485 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L305 486 3215006100010 Multi-layer chip inductor 0603 10nH LL1608(RoHS) L512 487 3221506601000 Chip ferrite bead 0603 600Ω±25% (100MHz)(RoHS)
  • Page 33 TC-618/626 Service Manual 536 3499000000180 Transistor UFMMT717 PNP SOT23(RoHS) Q611 537 3501020000030 FET 3SK318YB-TL-E-Q N-channel(RoHS) Q501 538 3503010000010 FET 2SJ243-T1-A P-channel(RoHS) Q653 539 3503020000030 FET 2SK1824-T1-A N--channel(RoHS) Q201 540 3503020000030 FET 2SK1824-T1-A N--channel(RoHS) Q203 541 3503040000000 FET UPA572T-A N-channel(RoHS) Q612 542 3504990000010 FET RD01MUS2-T113 Pout>0.8W Gp>14dB(RoHS)
  • Page 34 TC-618/626 Service Manual 589 3210306270000 Multi-layer chip inductor 0603 27nH LQG18(RoHS) L412 590 3101055610000 Chip capacitor 0402 560PF K 50V(RoHS) C206 591 3231301340000 Air-core inductor E2 0.3*1.3*4TR(RoHS) L409 592 3231351650000 Air-core inductor E2-0.35*1.6*5TL(RoHS) L410 593 3212106680000 Multi-layer chip inductor 0603 68nH HK1608(RoHS) R413 594 3104071040010 Tantalum capacitor 0.1UF M 20V -55~+125℃...
  • Page 35 TC-618/626 Service Manual TC-618/626 (400-420MHz) Parts List 1 Material No. Description Qty. Ref No. Print No. 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) C222 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R244 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R248 3001050000000 Chip resistor 0402 0Ω...
  • Page 36 TC-618/626 Service Manual 53 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R436 54 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R530 55 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R695 56 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R696 57 3001051040000 Chip resistor 0402 100KΩ F 1/16W(RoHS) R208 58 3001051040000 Chip resistor 0402 100KΩ...
  • Page 37 TC-618/626 Service Manual 107 3001051850000 Chip resistor 0402 1.8MΩ J 1/16W(RoHS) R440 108 3001052200010 Chip resistor 0402 22Ω F 1/16W(RoHS) R401 109 3001052210000 Chip resistor 0402 220Ω J 1/16W(RoHS) R510 110 3001052210000 Chip resistor 0402 220Ω J 1/16W(RoHS) R709 111 3001052220000 Chip resistor 0402 2.2KΩ J 1/16W(RoHS) R103 112 3001052220000 Chip resistor 0402 2.2KΩ...
  • Page 38 TC-618/626 Service Manual 161 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R245 162 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R267 163 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R304 164 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R305 165 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R307 166 3001054730000 Chip resistor 0402 47KΩ...
  • Page 39 TC-618/626 Service Manual 215 3101050400010 Chip capacitor 0402 4PF B 50V(RoHS) C534 216 3101050500010 Chip capacitor 0402 5PF B 50V(RoHS) C136 217 3101050500010 Chip capacitor 0402 5PF B 50V(RoHS) C138 218 3101050500010 Chip capacitor 0402 5PF B 50V(RoHS) C519 219 3101050600010 Chip capacitor 6PF B 50V COG 0402(RoHS)
  • Page 40 TC-618/626 Service Manual 269 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C667 270 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C670 271 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C680 272 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS)
  • Page 41 TC-618/626 Service Manual 323 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C537 324 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C642 325 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C650 326 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C655 327 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS)
  • Page 42 TC-618/626 Service Manual 377 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C117 378 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C126 379 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C131 380 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C134 381 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS)
  • Page 43 TC-618/626 Service Manual 431 3101060100010 Chip capacitor 0603 1PF B 50V(RoHS) C125 432 3101060100010 Chip capacitor 0603 1PF B 50V(RoHS) C456 433 3101060100010 Chip capacitor 0603 1PF B 50V(RoHS) C459 434 3101060200010 Chip capacitor 0603 2PF B 50V(RoHS) C452 435 3101060300010 Chip capacitor 0603 3PF B 50V(RoHS)
  • Page 44 TC-618/626 Service Manual 485 3213212561000 Multi-layer chip inductor 1008 0.56uH NLV25(RoHS) L408 486 3213306102000 Multi-layer chip inductor 0603 1uH MLF1608(RoHS) L200 487 3213306102000 Multi-layer chip inductor 0603 1uH MLF1608(RoHS) L300 488 3213306102000 Multi-layer chip inductor 0603 1uH MLF1608(RoHS) L301 489 3213306102000 Multi-layer chip inductor 0603 1uH MLF1608(RoHS)
  • Page 45 TC-618/626 Service Manual 539 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q102 540 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q103 541 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q104 542 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q105 543 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q400 544 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q502 545 3403007000000 Transistor DTA114EE(TL) PNP(RoHS)
  • Page 46 TC-618/626 Service Manual 593 3302030500020 Zener diode UDZSTE(1718B)18V SOD-323(RoHS) D610 594 3399990000080 Zener diode EDZTE616.8B SOD-523(RoHS) D210 595 3399990000080 Zener diode EDZTE616.8B SOD-523(RoHS) D220 596 3399990000080 Zener diode EDZTE616.8B SOD-523(RoHS) D250 597 3399990000080 Zener diode EDZTE616.8B SOD-523(RoHS) D430 598 3001055600000 Chip resistor 0402 56Ω J 1/16W(RoHS) R105 599 3001055600000 Chip resistor 0402 56Ω...
  • Page 47 TC-618/626 Service Manual TC-626 (420-470MHz) Parts List 1 Material No. Description Qty. Print No. 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) C222 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R103 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R244 3001050000000 Chip resistor 0402 0Ω...
  • Page 48 TC-618/626 Service Manual 50 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R301 51 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R302 52 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R400 53 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R436 54 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R530 55 3001051030000 Chip resistor 0402 10KΩ...
  • Page 49 TC-618/626 Service Manual 101 3001051820000 Chip resistor 0402 1.8KΩ J 1/16W(RoHS) R303 102 3001051830000 Chip resistor 0402 18KΩ J 1/16W(RoHS) R224 103 3001051830000 Chip resistor 0402 18KΩ J 1/16W(RoHS) R233 104 3001051840000 Chip resistor 0402 180KΩ J 1/16W(RoHS) R107 105 3001051840000 Chip resistor 0402 180KΩ J 1/16W(RoHS) R316 106 3001051840000 Chip resistor 0402 180KΩ...
  • Page 50 TC-618/626 Service Manual 152 3001054720000 Chip resistor 0402 4.7KΩ J 1/16W(RoHS) R506 153 3001054720000 Chip resistor 0402 4.7KΩ J 1/16W(RoHS) R651 154 3001054720000 Chip resistor 0402 4.7KΩ J 1/16W(RoHS) R699 155 3001054720000 Chip resistor 0402 4.7KΩ J 1/16W(RoHS) R700 156 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R234 157 3001054730000 Chip resistor 0402 47KΩ...
  • Page 51 TC-618/626 Service Manual 203 3101050200010 Chip capacitor 0402 2PF B 50V(RoHS) C501 204 3101050200010 Chip capacitor 0402 2PF B 50V(RoHS) C505 205 3101050200010 Chip capacitor 0402 2PF B 50V(RoHS) C508 206 3101050200010 Chip capacitor 0402 2PF B 50V(RoHS) C560 207 3101050200010 Chip capacitor 0402 2PF B 50V(RoHS)
  • Page 52 TC-618/626 Service Manual 254 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C320 255 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C323 256 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C341 257 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS)
  • Page 53 TC-618/626 Service Manual 305 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C253 306 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C255 307 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C256 308 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C257 309 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS)
  • Page 54 TC-618/626 Service Manual 356 3101052200010 Chip capacitor 22PF J 50V C0G 0402(RoHS) C245 357 3101052210010 Chip capacitor 220PF K 50V X7R 0402(RoHS) C260 358 3101052210010 Chip capacitor 220PF K 50V X7R 0402(RoHS) C275 359 3101052220010 Chip capacitor 2200pF K 50V X7R 0402(RoHS)
  • Page 55 TC-618/626 Service Manual 407 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C659 408 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C660 409 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C671 410 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C675 411 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C676 412 3101054730000 Chip capacitor 0402 0.047UF K 10V(RoHS)
  • Page 56 TC-618/626 Service Manual 458 3101071050010 Chip capacitor 0805 1UF K 10V(RoHS) C318 459 3101102260010 Chip capacitor 22uF Z 10V Y5V 1206(RoHS) C251 460 3102992000040 Trimmer capacitor 10pF 55V SMD(RoHS) TC100 461 3102992000040 Trimmer capacitor 10pF 55V SMD(RoHS) TC101 462 3104071050070 Tantalum capacitor 1UF M 16V -55~+125 ℃ P(RoHS) C264 463 3104072250060 Tantalum capacitor 2.2UF M 10V -55~+125℃...
  • Page 57 TC-618/626 Service Manual 509 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L109 510 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L110 511 3213306332000 Multi-layer chip inductor 0603 3.3uH MLF1608(RoHS) L305 512 3217106829000 Inductor 0603 8.2nH J(RoHS) L405 513 3221506601000 Chip ferrite bead 0603 600Ω±25% (100MHz)(RoHS) L100 514 3221506601000 Chip ferrite bead 0603 600Ω±25% (100MHz)(RoHS)
  • Page 58 TC-618/626 Service Manual 560 3403007000020 Transistor DTA114YE(TL) PNP(RoHS) Q431 561 3403008000010 Transistor DTC114EE(TL) NPN(RoHS) Q204 562 3403008000010 Transistor DTC114EE(TL) NPN(RoHS) Q430 563 3403008000010 Transistor DTC114EE(TL) NPN(RoHS) Q614 564 3403008000010 Transistor DTC114EE(TL) NPN(RoHS) Q615 565 3403009000010 Transistor UMG3N(N-TR) NPN(RoHS) Q609 566 3403009000010 Transistor UMG3N(N-TR) NPN(RoHS)
  • Page 59 TC-618/626 Service Manual 611 3002992240020 Trimmer resistor 220KΩ ± 25% -40~+125℃ SMD(RoHS) VR200 612 3001051220000 Chip resistor 0402 1.2KΩ J 1/16W(RoHS) R101 613 3001053920010 Chip resistor 0402 3.9KΩ J 1/16W(RoHS) R248 614 3001055130000 Chip resistor 0402 51KΩ F 1/16W(RoHS) R235 615 3001055620000 Chip resistor 0402 5.6KΩ...
  • Page 60 TC-618/626 Service Manual TC-618 (450-480MHz) Parts List 1 Material No. Description Qty. Ref No. Print No. 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) C222 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R244 3001050000000 Chip resistor 0402 0Ω J 1/16W(RoHS) R248 3001050000000 Chip resistor 0402 0Ω...
  • Page 61 TC-618/626 Service Manual 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R436 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R530 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R695 3001051030000 Chip resistor 0402 10KΩ J 1/16W(RoHS) R696 3001051040000 Chip resistor 0402 100KΩ F 1/16W(RoHS) R208 3001051040000 Chip resistor 0402 100KΩ...
  • Page 62 TC-618/626 Service Manual 3001051840000 Chip resistor 0402 180KΩ J 1/16W(RoHS) R513 3001051850000 Chip resistor 0402 1.8MΩ J 1/16W(RoHS) R228 3001051850000 Chip resistor 0402 1.8MΩ J 1/16W(RoHS) R440 3001052200010 Chip resistor 0402 22Ω F 1/16W(RoHS) R401 3001052220000 Chip resistor 0402 2.2K Ω J 1/16W(RoHS) R101 3001052220000 Chip resistor 0402 2.2K Ω...
  • Page 63 TC-618/626 Service Manual 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R304 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R305 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R307 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R402 3001054730000 Chip resistor 0402 47KΩ J 1/16W(RoHS) R636 3001054730000 Chip resistor 0402 47KΩ...
  • Page 64 TC-618/626 Service Manual 3101050400010 Chip capacitor 0402 4PF B 50V(RoHS) C521 3101050400010 Chip capacitor 0402 4PF B 50V(RoHS) C532 3101050500010 Chip capacitor 0402 5PF B 50V(RoHS) C136 3101050500010 Chip capacitor 0402 5PF B 50V(RoHS) C138 3101050590020 Chip capacitor 0402 0.5PF B 50V(RoHS)
  • Page 65 TC-618/626 Service Manual 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C609 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C641 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C644 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS) C646 3101051020010 Chip capacitor 1000PF K 50V X7R 0402(RoHS)
  • Page 66 TC-618/626 Service Manual 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C332 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C333 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C409 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C415 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS) C418 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402(RoHS)
  • Page 67 TC-618/626 Service Manual 377 3101053920000 Chip capacitor 0402 3900PF K 25V(RoHS) C679 378 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C117 379 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C126 380 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS) C131 381 3101054710010 Chip capacitor 0402 470PF K 50V(RoHS)
  • Page 68 TC-618/626 Service Manual 3101056820000 Chip capacitor 0402 6800PF K 25V(RoHS) C244 3101056830000 Chip capacitor 0402 0.068UF K 6.3V(RoHS) C215 3101056830000 Chip capacitor 0402 0.068UF K 6.3V(RoHS) C227 3101056830000 Chip capacitor 0402 0.068UF K 6.3V(RoHS) C236 3101060100010 Chip capacitor 0603 1PF B 50V(RoHS)
  • Page 69 TC-618/626 Service Manual 3213212102000 Multi-layer chip inductor 1008 1uH NLV25(RoHS) L453 3213212102000 Multi-layer chip inductor 1008 1uH NLV25(RoHS) L510 3213212331000 Multi-layer chip inductor 1008 330nH NLV25(RoHS) L509 3213212820010 Multi-layer chip inductor 1008 82nH NLV25(RoHS) L408 3213306102000 Multi-layer chip inductor 0603 1uH MLF1608(RoHS)
  • Page 70 TC-618/626 Service Manual 3399990000260 Diode HSM88ASTL-E(RoHS) D508 3401001000080 Transistor 2SA1362-GR(TE85.F) PNP(RoHS) Q654 3401001000490 Transistor 2SA1832-GR(TE85L.F) PNP(RoHS) Q202 3401001000490 Transistor 2SA1832-GR(TE85L.F) PNP(RoHS) Q655 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q102 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q103 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q104 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS) Q105 3401002000990 Transistor 2SC5108-Y(TE85L.F) NPN(RoHS)
  • Page 71 TC-618/626 Service Manual 593 3104082260060 Tantalum capacitor 22UF M 10V -55~+125 ℃ A(RoHS) C673 594 3104081060120 Tantalum capacitor 10UF M 16V -55~+125 ℃ S(RoHS) C229 595 3104081060120 Tantalum capacitor 10UF M 16V -55~+125 ℃ S(RoHS) C252 596 3104081060120 Tantalum capacitor 10UF M 16V -55~+125 ℃ S(RoHS) C431 597 3104074750070 Tantalum capacitor 4.7UF M 10V -55~+125 ℃...

  • Page 72: Adjustment Description

    TC-618/626 Service Manual Adjustment Description I. Parts Overview (TC-618 as the sample) II. Required Test Instruments Communication Test Set (HP8921) 1 set 10V/3A Regulated DC Power Supply 1 set Digital Voltmeter 1 set Ammeter 1 set III. Preparation Place the board to be tested on the test fixture (please ensure good connection between each test point and the fixture), and connect the board to a power supply.
  • Page 73 TC-618/626 Service Manual TC-618/626 Adjustment Item Wide Bandwidth Narrow Bandwidth Channel Adjustable Frequency Freq. 1 Freq. 2 Freq. 3 Freq. 4 Freq. 5 Freq. 1 Freq. 2 Freq. 3 Freq. 4 Freq. 5 TX Section Preset RF Power TX Low Power...
  • Page 74 TC-618/626 Service Manual CTCSS Deviation (medium), CTCSS Deviation (high) and TX Low Voltage Threshold. Note: These items are adjusted in the adjustment mode via software. RX group: VCO Lock Voltage (outside the adjustment mode), Squelch, Rx Bandpass Filter and RX Low Voltage Threshold.
  • Page 75 TC-618/626 Service Manual press PTT to transmit. Adjust the Rotate the output audio Channel signal of Selector knob communication Wide to CH1, CH2 test set to 8~15mV Bandwidth and CH3, and ensure that the press PTT to deviation value Communication transmit.
  • Page 76 TC-618/626 Service Manual Rotate the Adjust VR200 Channel with ceramic Selector knob tuning tool until Wide to CH1, CH2 the frequency 3.7~4.3KHz Bandwidth and CH3, and deviation Communication press PTT to meets the Test Set BPF: transmit. requirements. Max. <20Hz~15kHz...
  • Page 77 TC-618/626 Service Manual Rotate the Channel Selector knob to CH2 and press PTT to enable Press this function. SK1/SK2 to Select the low adjust the frequency. Communication output power, Antenna 2W± 0.3W Tx Power Low Power Test Set / and rotate the...
  • Page 78 TC-618/626 Service Manual Rotate the Channel Selector knob to Adjust VR601 CH6, CH7 and with ceramic CH8, and set tuning tool to their CTCSSs to check each low, medium frequency. and high 500~900Hz Apply SK1 or Wide respectively. (550-650Hz is...
  • Page 79 TC-618/626 Service Manual Apply SK1 or SK2 to Rotate the perform Channel Communication adjustment, Selector knob to Test Set and rotate the CH12 and select BPF: Channel VOX Level 4. <20Hz~15kHz Selector Press SK1 or AF: 1kHz knob to save SK2 to enable 3.5mV...
  • Page 80 TC-618/626 Service Manual Rotate the Channel Selector knob to CH2, and set to SQL On 5. Press SK1 Communication or SK2 to Test Set enable this SSG: -119dB Squelch function, and MOD: 1KHz level(5): select the DEV: 3KHz -119± 1dB...
  • Page 81 TC-618/626 Service Manual Rotate the Channel Selector knob to CH4, and set to SQL Off 1. Press SK1 Communication or SK2 to Test Set enable this SSG: -124dBm Squelch function, and MOD: 1KHz level(1): select the DEV: 3KHz -124± 1dB...
  • Page 82 Voltage Supply ≤6.50V Voltmeter Supply level (red Threshold Port LED flashes and alert tone sounds). Appendix 1: Reference Value for TC-618/626 Source Radio Wide Bandwidth Narrow Bandwidth Test Item Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq...
  • Page 83 SQL Level 1 OFF SQL Level 5 OFF SQL Level 9 OFF RX Low Voltage Threshold Bandpass Filter Appendix 2: Reference Value for TC-618/626 Battery Strength Test in Tx status: Green LED glows (70%~100%) >7.35V 18 Minutes Orange LED glows (50%~70%) 7.15V - 7.35V...

  • Page 84: Troubleshooting Flow Chart

    TC-618/626 Service Manual Troubleshooting Flow Chart Transmit Circuit...

  • Page 85: Receive Circuit

    TC-618/626 Service Manual Receive Circuit Start No signal received Check the Rx The Rx circuit is power supply normally supplied? circuit . Rx LED works The Rx frequency is normally? correctly set? Change the Rx frequency. The Rx signaling is...
  • Page 86 TC-618/626 Service Manual...

  • Page 87: Disassembly And Assembly For Repair

    TC-618/626 Service Manual Disassembly and Assembly for Repair (TC-618 as the example) Removing the Battery ① Power off the radio. Then hold the upper part of the radio and press the belt clip to make it tilt. Lift the battery latch in the direction as shown in Figure 1.
  • Page 88 TC-618/626 Service Manual ② ④ ③ ① Figure 5 ⑤ Lift the bottom of the aluminum chassis. Then pull the aluminum chassis backwards and take it out. ⑥ Remove the rear cover, as shown in Figure 6. ⑥ ⑤ Figure 6 ⑦...
  • Page 89 TC-618/626 Service Manual Removing the Antenna Rotate the antenna counter-clockwise until you can remove it. See Figure 8. Attaching the Antenna ① Align the threaded end of the antenna with the antenna connector located on the radio’ s top side ②...

  • Page 90: Exploded View

    TC-618/626 Service Manual Exploded View TC-618...
  • Page 91 TC-618/626 Service Manual TC-626...

  • Page 92: Tc-618/626 Parts List 2

    TC-618/626 Service Manual TC-618/626 Parts List 2 TC-618 Qty. Part No. Description (PCS) 6000846100000 Volume Control knob, black 00(RoHS) 6000845100000 Channel Selector knob, black 00(RoHS) 6201066000000 Inner lining for knob 00(RoHS) 7207002200200 Nut 00(RoHS) 6100334000000 O-ring for Channel Selector knob...
  • Page 93 5001210000030 Speaker (RoHS) 4210060000100 Lead, black (RoHS) 6000700000000 Earpiece cover stopper, white 00(RoHS) 6000848000000 Accessory jack cover, black 00(RoHS) 8600618500000 Label for HYT radio model 00(RoHS) 7400202000000 Speaker 00(RoHS) 8600610600000 PC label of HYT LOGO 00(RoHS) 6201739000000 Inner lining 00(RoHS)
  • Page 94 Inner lining 00(RoHS) 6201739000000 Inner lining 00(RoHS) Channel selector knob, black 00 6000845100000 (RoHS) 6000846100000 Volume control knob, black 00(RoHS) 8600620600000 PC label of HYT LOGO 00(RoHS) Note: Parts that are not marked with material number may vary with radio frequency band.

  • Page 95: Packing

    TC-618/626 Service Manual Packing (TC-618 as the example)

  • Page 96: Tc-618/626 Pcb View

    TC-618/626 VHF PCB View Top Layer...
  • Page 97 TC-618/626 VHF PCB View Bottom Layer...
  • Page 98 TC-618/626 UHF PCB View Top Layer...
  • Page 99 TC-618/626 UHF PCB View Bottom Layer...

  • Page 100: Tc-618/626 Level Diagram

    TC-618/626 Service Manual TC-618/626 Level Diagram TX PART 16mVrms 450mVrms 150mVrms -45dBm -26dBm -8dBm 3dBm 15dBm 27dBm 39dBm 37dBm buffer stimulator power AMP AN29160 Q400 2SC5108 Q401 2SK4988 MICROPHONE Q402 Q403 Q100 C112 2SK508NV Q102 Q104 D400 2SK3475 RQA0002 C429...

  • Page 101: Tc-618/626 Block Diagram

    TC-618/626 UHF Block Diagram TC-618&626UHF 原理框图 ANTENNA RF PA Q402 Q403 RQA0002 2SK3475 Q103 Q400 U609 Q104 2SC5108 2SC5108 AT 24C64 Q401 MATCH R/TSW 2SC4988 L453 Q102 3 Amplifier BUFFER green D602 D601 D100 APC/TUNE U605 Q100 2SK508NV L101 D104...
  • Page 102 TC-618/626 VHF Block Diagram TC-618&626VHF 原理框图 RF PA ANTENNA Q403 Q402 RQA0002 2SK3475 Q103 Q400 U609 Q104 2SC5108 2SC5108 AT 24C64 Q401 MATCH R/TSW 2SC4988 L453 Q102 3 Amplifier BUFFER green D602 D601 D100 D104 APC/TUNE U605 Q100 2SK508NV L101...

  • Page 103: Tc-618/626 Schematic Diagram

    TC-618/626 VHF Schematic Diagram (AF & IF & PLL) TC610/620 VHF 原理图 V_SAVE L308 L308 1K*4 1K*4 PLLEN C253 C253 X300 X300 C320 1000P C320 1000P L301 L301 C323 1000P C323 1000P PLLDATA R303 R303 L300 L300 C316 C316 PLLCLK V_SAVE 0.1U...

  • Page 104: Specifications

    TC-618/626 VHF Schematic Diagram (MCU & POWER) TC610/620 VHF 原理图 VCC_5V APC/TU U609 U609 TX_C PLLCLK AT24C64 AT24C64 PLLDATA DATA C642 C642 PLLEN 0.1u 0.1u V_BAT R690 R690 R698 R698 R695 R695 C667 C667 D601 D601 D602 D602 C666 C666...
  • Page 105 TC-618/626 VHF Schematic Diagram (VCO & RF) TC610/620 VHF 原理图 ANTENNA ANTENNA V_SAVE V_SAVE L113 L113 R110 R110 D401 D401 L114 L114 C139 C139 C135 C135 R116 R116 R408 R408 C407 C407 C412 C412 C429 C429 C450 C450 C456 C456...
  • Page 106 TC-618/626 UHF Schematic Diagram (AF & IF & PLL) V_SAVE TC-618/626 UHF Schematic Diagram (AF&IF&PLL) L308 L308 1K*4 1K*4 PLLEN C253 C253 X300 X300 C320 1000P C320 1000P L301 L301 C323 1000P C323 1000P PLLDATA R303 R303 L300 L300 C316...
  • Page 107 TC-618/626 UHF Schematic Diagram (MCU & POWER) TC-618/626 UHF Schematic Diagram (MCU&POWER) VCC_5V APC/TU U609 U609 TX_C PLLCLK AT24C64 AT24C64 PLLDATA DATA C642 C642 PLLEN 0.1u 0.1u V_BAT R690 R690 R698 R698 R695 R695 C667 C667 D601 D601 D602 D602...
  • Page 108 TC-618/626 UHF Schematic Diagram (VCO & RF) TC-618/626 UHF Schematic Diagram (VCO&RF) V_SAVE V_SAVE R110 R110 C139 C139 L113 L113 C135 C135 L114 L114 R116 10 R116 10 C402* C402* R404 1.5K R404 1.5K C405* C405* C429* C429* ANTENNA ANTENNA...
  • Page 109 Battery Life (5-5-90 duty cycle) Approximately 10 hours Operating Temperature -20 ~ +50℃ Dimensions (H×W×D) TC-618: 119mm x 55mm x 33mm (with battery, without antenna) TC-626: 117mm x 54mm x 31mm TC-618: 270g Weight (with antenna & battery) TC-626: 275g Frequency Stability ±...
  • Page 110 TC-618/626 Service Manual HYT endeavors to achieve the accuracy and completeness of this manual, but no warranty of accuracy or reliability is given. All the specifications and designs are subject to change without notice due to continuous technology development. Changes which may occur after publication are highlighted by Revision History contained in Service Manual.

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Tc-626

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