CONTENTS General-------------------------------------------------------------------------------------2 Radio Overview-------------------------------------------------------------------------3 Software Specifications--------------------------------------------------------------7 Circuit Description---------------------------------------------------------------------8 Semiconductor Data----------------------------------------------------------------16 TC-610/620 Parts List 1-----------------------------------
(U2) Schematic Diagram (MCU & POWER)………………………………………….………… (U2) Schematic Diagram (VCO & RF)………………………………………….
General 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. Safety and General Information The following general safety precautions as would normally apply, should be observed during all phases of operation, service and repair of this equipment. z This equipment should be serviced by qualified technicians only.
Radio Overview TC-610 ① PTT ② SK1 (programmable key) ③ SK2 (programmable key ⑤ Microphone ⑥ Antenna ⑦ LED ⑨ On-Off/Volume Control Knob ⑬ Belt Clip ⑪ Earpiece ⑩ Battery Latch ⑧ Channel Selector Knob Jack Programming Port ⑭ Battery ⑮ Belt Clip Screw 4 ④ Speaker and ⑫ Earpiece Cover ⑯ Charging Piece
TC-620 11 6 7 8 9 15 13 4 1 2 3 5 12 14 16 10 ① PTT ② SK1 (programmable key) ③ SK2 (programmable key ⑤ Microphone ⑥ Antenna ⑦ LED ⑨ On-Off/Volume Control Knob ⑬ Belt Clip ⑪ Earpiece ⑩ Battery Latch ⑧ Channel Selector Knob Jack Programming Port ⑭ Battery ④ Speaker ⑮ Belt Clip Screw and ⑫ Earpiece Cover ⑯ Charging Piece PTT Used to switch between transmitting and receiving modes. Hold down PTT and speak into the microphone to transmit, while release it to receive.
SK1 Side key 1, programmable. Your dealer can program the key with a function via the programming software. SK2 Side key 2, programmable. Your dealer can program the key with a function via the programming software. LED LED statuses and alert tones: Power on the source radio while holding down the SK2 key. Power on LED flashes orange once. the slave radio directly. User Source radio (After the When cloning, LED flashes red. Wired slave radio is powered When completed, red LED goes out.
LED glows red. Transmit When transmission times out, “BEEP” tone sounds continuously. TOT pre-alert: “BEEP” tone sounds once. Receive When a carrier is received, LED glows green. When detecting, LED flashes green every second. Scan start tone (programmable by your dealer): “BEEP” tone sounds once. Scan Scan stop tone (programmable by your dealer): “BEEP” tone sounds once.
Turn the knob clockwise to increase the volume, or counter-clockwise to decrease the volume. Software Specifications Functions 1. Available Channels: 1 to 16 channels Frequency Range: UHF: 400-420MHz UHF: 450-470MHz 2. Channel Spacing: 25KHz/12.5KHz 3. Channel Step: 5/6.25/10/12.5KHz channel scan function 4. Tx/Rx Indication (red/green LED) 5. CTCSS/CDCSS (38 groups of CTCSS and 83 groups of CDCSS with degrees of 180/120 available for CTCSS squelch tail reverse method) 6. Low Battery Power Alert 7.
Circuit Description Realization Methods for Basic Functional Modules PLL Frequency Synthesizer The PLL circuit generates local oscillator signals for reception and RF carrier signals for transmission. The PLL circuit consists of the VCO oscillator circuit and baseband processor chip and realizes frequency tracking and channel conversion under the control of MCU signals. PLL 2 1.
U202 generates a control voltage via the phase comparator to control varactors (D100 and D101 in transmitting mode; D102 and D103 in receiving mode) to bring the oscillator frequency of VCO in line with the preset frequency of MCU within a broader frequency range. The switching tube Q652 switches between transmitting and receiving under the control of T/R. In transmitting mode, T/R is set as low level and Q100 operates when Q653 becomes conductive.
LNA 2 TUNE FROM MCU C524 TUNE FROM MCU Q500 C521 1 C505 C526 D506 D505 D504 3 D507 C523 C519 L508 D503 C506 L507 C504 L506 L502 TUNE BPF L501 TUNE BPF Figure 4 The Rx signals input from the antenna is filtered to remove out-of-band signals at the electrically tunable bandpass network (D503, D504, L501, L502, C503, C505 and 507) and then amplified by low-noise amplifier (LNA) Q500 to obtain a certain level required by reception.
is utilized. The mixer tube (Q501) utilizes dual gate FET MOS (3SK318) and has better noise characteristics and square law characteristics. The isolation between the local oscillator signals and the Rx signals is high. To ensure proper sensitivity and certain gain for the mixer tube, tune delicately via the offset. The signals output from the mixer pass through inductor L509 to remove residual spurious and then enter the first IF filter.
Audio and Signalling Processing Circuit Baseband processing IC AN29160 has high integration level and powerful functions. Many of the processing functions (as VCO level detect&output, SQ signal level detect&output, Tx-Rx audio processing switch, audio amplifier, etc) and can be realized inside. The Tx-Rx sharing can also be realized.
Block Diagram for Rx Audio&Signalling Process 2ndIF BPF CF300 OUT 450KHz+/4.
MCU Control Section The block diagram for the MCU control section is shown below. MCU works under the 7.3728MHz clock frequency. U609 4 6 C 4 2 T A Channel SW 1.vox 2.BUSY_DET 3.BEEP/CALL 4.T/R 5.SAVE 6.DC/CTC 7.W/N 8.UART 9.BAT_DET 10.PLL_LD U605 APC/TUNE MB95F108AK WPFV-GE1 PLL PTT MON 7.3728M晶体 X601 BAT U610 Reset IC Figure 9 The MCU control section is composed of MCU, EEPROM, RESET IC, keys, Channel Selector knob, etc. Main functions realized by this circuit section are: 1.
Detect of external PTT, MONI and VOX Detect of PLL unlock (UL) Detect of VOX ON level Detect of battery power alarm Detect of enabling and checking external remote speaker microphone 3. Data Transfer and Process EEPROM data initiation Programming data transfer Encoding process of channel selector knob Signalling encoding and decoding Data transfer of baseband processing chip (PLL) Power Supply Process Block Diagram for the Circuit POWER-SAVE V-TX 5V FMMT717 U606 Q611 Vout VSS Vin FMMT717 7.
(control signal of SAVE). When the SAVE signal of MCU is of high level, Q610 becomes conductive and provides a 5V voltage (V_SAVE) for the operating circuit. PLL and the receiving circuit operate. When the SAVE signal is a pulse signal, the radio enter the battery save mode. When transmitting, TXC, control signal of CPU, is of high level. Q611 becomes conductive and provide a 5V voltage for the transmitting circuit and the transmitting circuit operates.
When the remote speaker microphone with VOX is inserted into the earpiece jack, Q201 cuts off. MIC_EN switches from low level to high level and Q202 completes the circuit with R204 and the external remote speaker microphone simultaneously. Q202 becomes conductive. EXT-PTT switches from low level to high level, which is detected by MCU as insert of a remote speaker microphone with VOX. The VOX function is enabled.
pin and the grounded Vss. When not downloading, only a resistor of 47K is connected between the pin and the grounded Vss. 14 X0 OSC0 OSC0 15 X1 OSC1 OSC1 16 Vss GND GND Power supply (GND) pin (When recording, it is connected with the GND recording port signals.) 17 Vcc VCC VCC MCU 5V power supply (When recording, it is connected with the VCC recording port signals) This port can not be used as IO and a capacitor is connected between the port and the grounded Vss. Connecting pin of 7.
40 P50/SCL0 SCL SCL S C EEPROM CLOCK L 41 P51/SDA0 SDA SDA S D EEPROM DATA A 42 P52/PPG1 AP/TU AP/TU P W Auto power control/adjust M 43 P53/TRG1 TX_CTRL TX_CTRL O 44 P60/PPG10 PLLCLK PLLCLK O PLL CLK 45 P61/PPG11 PLLDATA PLLDATA O PLL DATA 46 P62/TO10 PLLEN PLLEN O PLL ENABLE 47 P63/TO11 Reserve Reserve O Reserved 48 P64/EC1 Reserve Reserve O Reserved 49 P65/SCK Reserve Reserve O Reserved 50 P66/SOT Reserve Reserve O Reserved 51 P67/SIN Self Self I
Adjustment User Mode Power on the radio to enter the conventional mode when no key is pressed. Programming Mode In user mode, the PC programming software triggers the PC programming mode by communication through a special communication protocol. The programming mode can set functions and adjustment parameters of the radio via the PC programming software (including user version and factory version). Wired Clone Mode Description The wired clone mode is a separate mode.
clone data into the slave radio. 2. During communication, LED of the mother radio flashes red, while LED of the slave radio flashes green. When the communication is completed, red LED of the mother radio and green LED of the slave radio go out, preparing for the next cloning. 3. During communication, if an exception occurs, the communication will be terminated. Red LED of the mother radio goes out, preparing for the next cloning. 4.
adjustment items and Rx adjustment items. If LED lights red upon key pressing, the radio switches to Tx adjustment items. If LED lights green upon key pressing, the radio switches to Rx adjustment items. LED glows red for Tx adjustment items. LED glows green for Rx adjustment items. Switch among Tx/Rx Adjustment Items Switch via the channel selector knob.
Hold down SK1, and the adjustment value decreases continuously in step of 1. When the adjustment value gets to the minimum value allowed by the adjustment item, the adjustment value will keep the minimum value constant. Process on Several Exceptional Items Tx: CH9-CH14 indicate VOX 1, VOX 2, VOX 3, VOX 4, VOX 5 and Tx low voltage threshold respectively, which are related with the AD sampling.
TC-610/620 Adjustment Items Channel 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 Wide Narrow Freq. 1 Freq. 2 Freq. 3 Freq. 4 Freq.5 Freq. 1 Freq. 2 Freq. 3 Freq. 4 Freq. 5 Tx Section Adjust preset RF power Y Tx low power Y Y Y Y Y Reserved channel (not adjust) Tx high power Y Y Y Y Y CDCSS deviation Y Y Y Y Y Y Y Y Y Y CTCSS (67Hz) deviation Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y CTCSS (151.8Hz) deviation Y Y Y Y Y Y Y Y Y Y CTCSS (254.
Tx frequency tolerance, VCO lock voltage adjustment, maximum deviation and modulation sensitivity Note: These items are adjusted outside the adjustment mode (unnecessary to enter the adjustment mode) via the hardware adjustment. Tx low power, Tx high power, CDCSS waveform, CDCSS deviation, CTCSS deviation (low), CTCSS deviation (high) and Tx low voltage threshold Note: These items are adjusted inside the adjustment mode via the software adjustment.
lock voltage is within the required range. Rotate to Wide Max. Rotate Deviation Narrow CH5 and CH6 ceramic alignment the deviation to the communication specified range. test set VR200 LPF: 15kHz AF:1kHz 150mV 1.7-2.2KHz Check PTT to transmit. Antenna Rotate to Earpiece CH1, CH2 jack Adjust the audio output signal of the and CH3 communication Modulation to transmit. test set Sensitivity Rotate CH4, CH5 and CH6 test set to get the deviation to 3.0KHz. BPF: 0.
Rotate to CH2. Press PTT to enable the Press function. Short to increase/decrease the Low frequency Low SK1/SK2 output press rotate PTT to switch power the and channel 2W±0.3W I≤1.2A selector knob to save. frequencies periodically (refer to the adjustment list) Adjust VR260 with a Rotate to CH5. Press PTT to enable the function. Low frequency ceramic Radio alignment screwdriver communication test Antenna set enable to the waveform LPF:0.
Low frequency Press PTT to switch other frequencies (medium-low, medium, medium-high and high) Rotate to CH6, CH7 and CH8 Wide respectively Adjust VR601 with a and CTCSS is ceramic alignment set to low, screwdriver and check medium and each frequency. high. Adjust finely with SK1 Press and SK2 to limit the PTT to enable this function.
Item Condition Test Equipment Parts Sensitivity (bandpass) Short press PTT to switch other frequencies. SINAD is within the Radio communication Rx Specification/ Remarks Check whether Rotate to CH8. Low frequency Method test set SSG:-119dB MOD:1KHz DEV:3.0KHz range and whether to Antenna get SINAD≥12dB by Remote SK1 adjusting SK1 or SK2. speaker MIC SK2 Rotate the channel jack selector knob to save after the five-point Filter: 0.
Rotate to CH5 and SQL is set to level 5 OFF. Adjust the output Press SK1 or SK2 to enable Wide the function. The channel spacing is wide band. signals of SSG to the Radio Antenna communication Remote SK1 test set speaker MIC SK2 SSG:-121dBm jack Short SQL level: the channel selector -121±1dB knob to save after the five-point adjustment is completed. Low frequency SQL squelch level. Rotate press PTT to switch OFF frequencies. Long press PTT (≥1.
Appendix: Reference Voltage Setting of Battery Capacity Check in transmitting mode LED >7.35V 18min LED 7.15V - 7.35V 12min Red LED (30%-50%) 7.00V - 7.15V 12min LED 6.20V - 7.00V 18min Green (70%-100%) Orange (50%-70%) flashes red 5.80V - 6.20V LED flashes red +an alarm tone sounds every 10 Halt <5.80V Check in transmitting and standby mode (or press the battery capacity check key. Green LED >7.55V 18min (70%-100%) Orange LED 7.35V-7.55V 12min 7.00V-7.
Troubleshooting Flow Chart Tx Section Start Low Tx power No voice during transmission No transmission Normal Tx power supply? Tx LED not light No Check Tx power supply No Tx VCO is locked? Replace D602 Yes Check voice channel (MIC, VR200 and D104) D602 glows red? No Yes Replace D602 Check Tx channel Check antenna connection Check Q400, Q401, Q402 and Q403 33 Check APC control circuit Check Tx VCO
Rx Section Start No receive Normal power supply of receiving circuit? No Check Rx power supply circuit Yes Normal Rx LED? No No Change Rx signalling Rx squelch level is correct? Yes Yes Speaker works well? No Replace the speaker Replace Rx LED D601 Yes Normal audio power amplifier? No Check audio power amplifier circuit Yes Normal Volume Selector knob? No Replace the Volume Selector knob Yes P29 and P25, which are pins of baseband processor ICU200, output signals well? No Check aud
MCU Start Normal power-on alert tone? Yes No Speaker works well? No Replace the speaker Yes MCU operating voltage VCC works well? No Check U606 Yes MCU clock crystal X601 works well? No Replace X601 Yes Check whether other control pins control well.
Disassembly and Assembly Attaching the Battery ① Hold the battery and push it towards the top of the aluminum chassis under the belt clip of the radio. See figure 1. Note: Insert the tabs at the top of the battery into the top of the battery slots. Figure 1 ② Press the bottom of the battery until a “click” is heard to fasten the battery on the bottom of the radio. See figure 2. Note: If the battery is not fastened or is still adrift, please remove the battery and attach it again.
② Release the battery latch and remove the battery when the bottom of the battery tilts. See figure 2. Note: To avoid serious abrasion between the tab on the top of the battery and the slot on the top of the radio, the angel between the radio unit and the tilting battery must not be too large. Figure 2 Attaching the Antenna ① ② Insert the threaded end of the antenna into the big threaded hole at the top of the radio. Rotate the antenna clockwise until it is fastened.
Removing the Antenna Rotate the antenna counter-clockwise to remove the antenna. Attaching the Belt Clip Loose the screw for the belt clip and fix the belt clip on the radio unit. Align the hole on the belt clip with that on the aluminum chassis and rotate the screw for the belt clip clockwise to fasten the clip. See figure 1. Figure 1 Removing the Belt Clip Please refer to the steps for attaching the belt clip when removing the belt clip. Loose the screw by rotating it counter-clockwise. See figure 2.
Figure 2 Attaching the External Earphone/Microphone ① Open the earphone/microphone jack cover (unnecessary to remove). See figure 1. Figure 1 ② Plug the earphone/microphone into the jack and fasten the screw. See figure 2.
Removing the External Earphone/Microphone Loose the screw and unplug the earphone/microphone. Note: When the external earphone/microphone is used, the radio’s waterproof performance will be affected.
Exploded View TC-610 35 1 34 2 3 33 4 5 32 6 31 7 30 8 9 29 10 28 11 27 12 26 25 13 14 24 15 23 22 16 21 17 20 18 19 41
TC-620 42
TC-610/620 Parts List 2 TC-610 No. Material No.
TC-620 No. Material No. Description Qty. 1 7102003500100 Machine screw 2 2 6000639000000 Earpiece cover 1 3 6300040000000 Decorative plate (zinc alloy) 1 4 6000127000000 Earpiece cover stopper 1 5 1500006200000 Front case kit 1 6 5001210000170 Speaker 1 7 7400141000000 NSM08Z01mic net 2 8 6100123000000 MIC cover 1 9 6100323000000 Holder (speaker jack) 1 10 7102004021030 Self-tapping screw ST2.0*3.
Packing 45
TC-610/620 PCB View 46
TC-610/620 Block Diagram 47
TC-610/620 Level Diagram TX PART -45dBm -26dBm VCO buffer C 1 SF Amp C130 1 C141 2 D400 C400 1 C402 1 Q402 2SK3475 Q403 RQA0002 C405 C429 C412 2 3 Q101 2SK508NV 3 D104 3 51 Mic Mute 37dBm LPF power AMP 2 Q104 39dBm Q401 2SK4988 2 3 40 Q102 27dBm 3 LMT 15dBm stimulator 2 Q100 2SK508NV 2 C112 AF HPF Mic Amp 3dBm Q400 2SC5108 AN29160 MICROPHONE -8dBm 1 150mVrms 1 450mVrms 3 16mVrms attenuator step1to23 200mVrms VR200 47K D500 AF RF RX PART -10dBm LP
TC-610/620 Schematic Diagram Specifications General 146－174 MHz 400－420 MHz Frequency Range 450－470 MHz Channel Capacity 16 Channel Spacing 25/12.5 MHz Operating Voltage 7.5V DC Battery Life Cycle） （ 5-5-90 Duty About 8 hours Operating Temperature -20～+50℃ Dimensions (H×W×D) TC-610:119mm x 54.6mm x 32.5mm (without antenna) TC-620:117mm x 54.3mm x 31mm (without antenna) TC-610: 270g (with antenna) TC-620: 275g (with antenna) Weight Frequency Stability ±2.
HYT endeavors to achieve the accuracy and completeness of this manual, but no warranty of accuracy or reliability is given. All the specifications and design are subject to change without prior notice due to continuous technology development. Changes which may occur after publication are highlighted by Revision History contained in Service Manual.
