4Main Function & Feature TC320 is a economy/business two-way radio which spread to the world in 2008 with different marketing requirement.It is unique for its compact and delicate size, and the ergonomically design will give you an exceptional experience of portability, deliver you secure, instant and reliable communications at peak efficiency.
5Main Function & Feature Fine shape fashionTC-320 smooth lines, ultra-thin appearance, with the mechanical design of the human body works. As a result of the use of mitigation for a long time and have a sense of fatigue. The whole production with battery and antenna, weighs about 135g.Easy one-hand operationTC-320 with the fine and streamlines body, use power switches and buttons to adjust the volume. Feel very good channel knob and PPT button, users can ensure that a signal basic walkie-talkie in one-hand operation.Mini USB socket programming/chargingTC-320 with a mini-USB interface, through HYT dedicated date lines, it can be achieved to TC-320 charge and direct programming.
8General Technical Specifications Freuquency rangeMHz MHz MHzChannel capacity16chChanel space25/12.5KHzFrequency stability±5ppmOperating voltage3.8V DCAlert voltage (RX/TX)3.7V/3.5V DCForbid TX voltage (RX/TX)3.5V/3.3V DCPower off voltage3.1V DCDimension (lenth×width×height)(with battery, no antenna)100mm×48mm×27mmWeight(with antenna and battery)135gBattery capacity (mAh)1100mAh（Li-ion）Working time≥10 hours
9Technical Specification Description of positive /negative electrodePositive electrodeNegative electrodeNegative electrodePositive electrode for charging powerNegative electrode
10Technical Specification CV voltage specification and adjustmentCV voltageHigh frequencyLow frequencyRX2.1±0.05V≥0.5VTX≤2.3VNotes:There is only one communal VCO for TX/RX while adjusting CV voltage. When adjust TC101, we need pay attention to TX CV voltage and RX CV voltage at same time. After adjustment, we should cover the hole with copper sheet.
11Technical Specification Specification and adjustment for TXTXFrequency error±600HzRF output power≥0.2WRF current while TX high powerAModulated limitation for widthKHzModulated distortion≤5%Notes:It should have a inductive test while testing the whole radio, the specification as above. TX output power for PCB testing is 2.0W/0.5W, the TX current ≤1.4A/0.8A.
12Technical Specification Specification and adjustment for RXRXReceiving sensitivity0.25uV/0.28uVMaxium audio power0.8W（16ohm）the rated audio distortion5%（0.4W）squelch level voltageuVNotes:Due to external interference ,the squelch level voltage range has some deviation.
14Software & Setting Programming Software Description In user mode, we can set some function and parameters via programming software in PC, the operation is as following:Install the programming software of TC320 in PCConnect the TC-320 and PC with the programming cable, one side is USB interface of PC, the other side is Mini USB socket of TC320Turn on the radioOpen the programming software, and read the data from the TC320Notes:If the radio enter the “READ” successfully, it will glitter red light, after having done it, it will extinguish red light; if the radio enter the “WRITE” successfully, it will glitter green light, after having done it , it will extinguish with green light.During the course of programming, if there is some abnormal case or no response, it show that the programming is failure, and the PC will alert some wrong information.
15Software & Setting Programming Software Description The programming software of TC-320 is the same with TC-518.Programming software latest version: HT E-VIts download address: software).zip
16Software & SettingAfter install the programming software of TC320, click “Model” --- “Model information” ,we can select the corresponding radio type and frequency range, then can do some operations such as “READ” or “ WRITE”.
17Software & SettingFrom the function of “Buttons/Keypad”, we can set the corresponding function of “SK1”, a new function of “Channel Lock” can be set here.
18Software & SettingNotes: Do not enable the function of “panel test mode” and “factory clone mode”.
19Software & SettingFrom “Per Channel”, we can set some parameters such as “frequency , power level, CTCSS/CDCSS” etc.
20Software & SettingFrom the “Per personality” , we can set some special parameters of “ TX/RX”
21Software & SettingFrom “Scan”, we can set some parameters for scan personality
22Software & Setting Wire Clone Mode The operation of wire clone mode Connect the master radio and slave radio with clone cable, press “SK” key of master radio and turn on the radio, after 2 seconds, it will enter wire clone mode, just turn on the slave radio, it also will enter wire clone modeIn wire clone mode , we can switch user clone mode to factory clone mode via pressing “SK” key ( we should enable “factory clone mode” in programming software , or we can not switch it )While press “PTT” key , the data from master radio will clone to slave radio, after finish it ,we can continue to clone other radiosThe indication of wire clone modeThe LED will glitter red light while cloning, and it will glitter green light after finish cloning;Slave radio：the LED will glitter green light and it will go out green light after finish cloningThe difference between “factory clone mode” and “ user clone mode”User clone mode: only can clone the related data ( such as frequency , CTCSS etc.) in user mode, it will not clone the adjusted frequency , baseband parameters etc.Factory clone mode: it will clone all data except “series number”NoticeIf the clone cable is not good contact, it will cause errorIf the LED flash red light while cloning, the master radio will alert low voltage emergency, but the data will not stop cloning
25Disassembly & Reassembly Components Description(1) PTT key (TX key)(2) SK key (programmable key)(3) speaker(4) Volume adjustable key(5) mic(6) Model logo(7) Charge pole(8) atenna(9) Power switch(10) Status indicator(11) Channel slecetor switch(12) Charge indicator(13) Earphone plug(14) Earphone socket(15) Mini USB socket(16) Belt clip(17) Belt clip screw(18) Battery cover(19) Battery latch
26Disassembly & Reassembly Disassemble RadioTurn off the radioRemove the antennaRemove the batteryPush the battery latch upward.Remove the battery coverTake out the battery from the bottom
27Disassembly & Reassembly Disassemble RadioDisassemble the channel selector knob and nut, waterproof ring.Remove the channel selector coverRemove the nutRemove the channel selector knobRemove the nut and waterproof ringChannel selector coverChannel selector knobNut and waterproof ring
28Disassembly & Reassembly Disassemble RadioDisassemble the back case and side PTT coverRemove the four screws from the back case.Push the back case upwardsPull out the back caseTake out the side PTT cover
29Disassembly & Reassembly Disassemble RadioDisassemble PCBRemove the 2 screws from the PCBRemove the steady ring from the PCB and the channel selector switchPay attention to the speaker line and charge pole of back case
30Disassembly & Reassembly Reassemble RadioReassemble PCBReassemble the MIC coverMake sure the speaker is good contact, the installation of charge pole in back case is normalInstall the steady ring of channel selector switch and put the PCB inside itScrew the two screwsMIC coverSpeaker cableSteady ring of channel selectorReassemble the model coverInstall the screwInstall ST1. 7X4 screws in the PCB
31Disassembly & Reassembly Reassemble RadioReassemble back caseReassembly the side PTT coverTake out the sponge and put it to right place.Screw the four screws213Install 4pcs PT2.0*8.0mm screws in sequencePTT cover
32Installation direction Disassembly & ReassemblyReassemble RadioReassemble the top nut and coverInstall the waterproof ring to the nutInstall the nut with the waterproof ring to the main unit, and screw it tightly with a cross sleeveInstall the channel selector knobScrew the fixed screwsInstall the channel selector knob coverWaterproof ringInstallation directionChannel Selector Knob5Screw the fixed screwsTake out the protect paper. Install the cover matching the marked point图13
33Disassembly & Reassembly Reassemble Radio5Reassemble the antennaInstall the battery and battery coverNoteStick copper foil
36Circuit Description & Analysis 1. RF Parts1.1 PLLPLL circuit generates the first local oscillator for reception and the RF signal for transmissionPLL circuit diagram
37Circuit Description & Analysis 1. RF Parts1.2 RF power amplifierThe demodulated carrier signal which output from VCO is pre-amplified by U501 and amplified by Q401, Q402, Q403, the amplified RF signal will be filtered by LPF to remove unwanted signal and send to antenna.Q404, Q405 and U401 are composed of APC, U401 is used to control the bias voltage of driving transistor Q402 and power amplifier FET Q403 so as to control transmitting current.RF power amplifier circuit diagram
38Circuit Description & Analysis 1. RF Parts1.3 RXThe input signal from antenna is filtered by acoustic wave filter to remove unwanted signal and amplified by Q506,then enter the high frequency /low noise filter of U501 for amplifying ,the amplified signal will be second mixed, demodulated, filtered, de-emphasis, decode and D-A switch and get audio signal.Receiving circuit diagram
39Circuit Description & Analysis 2. MCU/Signal processing and audio amplifier
40Circuit Description & Analysis 2. MCU/Signal processing and audio amplifier2.1 MCUThe control circuit is composed of MCU, EEPROM.The main function of MCU: data’s transmitting and store; checking the signal of external pressing keys, VOX-DET and process; control and switch receive /transmit; open/close the squelch circuit; output a controlling signal to control high/low switch circuit, audio amplifier circuit, VCO power supply circuit, receiving power supply circuit and transmitting power supply circuit.2.2 Signal processTransmitting baseband processReceiving baseband process2.3 Audio amplifierThe audio signal out from U601 is processed and amplified by audio amplifier IC(U301) and drive the speaker to get audio.
41Circuit Description & Analysis 3. Power SupplyPower Supply DiagramThe power supply of 3.7V which controlled and switched by U602 and get two line 3V DC, one is VCC for CPU, the other 3V to VT and VR under the controlling of V-SAVE, also it supply V-SAVE to PLL.
43Basic Troubleshooting Can not power onNo voice or abnormality voice while powering onNo /low TX powerNo Rx/low receiving sensitivityUnlock while powering onCan not charge normally
44Basic Troubleshooting Can not power onStepsCheck the battery capacity is full and the battery plate is well contact with the main unitCheck the power switch is brokenCheck whether pin6 of AVR IC U602 is 3V outputCheck the crystal KHz for CPU is brokenCheck the reset IC U605 is broken?Check the pins of CPU is falsely-solderingPower switchAVRU602Reset IC U60532.768KHzCPU falsely-soldering
45The soldering of speaker line Basic Troubleshooting6. Basic TroubleshootingNo voice or abnormal voice while powering onStepsCheck speaker, speaker line’s soldering is normalCheck speaker socket is brokenCheck audio power amplifier IC U301（AP4890）is normalAudio power amplifierThe soldering of speaker lineSpeaker socket
46Basic Troubleshooting No/low TX powerStepsCheck the output voltage of Q601Check TX currentCheck the bias voltage of final power amplifierCheck the output voltage of pin4 for U501Check power amplifier while there is current but no TX power. Check power supply for TX circuit while there is no current no power.about 3.7Vabout1.0VFinal PA RQA0002U501Q601
47Basic Troubleshooting No RX/low Receiving SensitivityStepsCheck the crystal of band pass filter is brokenCheck filter 450KHz is loose or brokenCheck the first mixer Q505 is brokenCheck the IF processing of IC U501 is falsely-soldering or brokenCheck the demodulator is loose or brokenIF IC U5011st Mixer Q505450 FilterCrystal 21.7MHzBand-pass filter50C24 demodulator
48Basic Troubleshooting Unlock while powering onStepsCheck CV is normalCheck the output voltage of pin85 for CPU is normal (H: lock, L: unlock)Check the crystal of 21.25MHz is normalCheck the pins of IC U501 for PLL is falsely-soldering or brokenCPU21.25M crystalPLL IC U501CV test point
49Basic Troubleshooting Can not charge normallyMini USB socketIC U604StepsCheck the output voltage of adapter is normalCheck the Mini USB socket is normalCheck the output voltage of charging IC U604 is normal
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