HYT Science and Technology Co TC-700U8 Two-way Radio User Manual TC 700 Service Manual 01

Shenzhen HYT Science &Technology; Co Ltd Two-way Radio TC 700 Service Manual 01

Users Manual

Contents General…………………………………………………………………………… Brief Introduction……………………………………………………………… Software Specification…………………………………………………………. Circuit Description…………………………………………………………… CPU Pins………………………………………………………………………… Part List 1……………………………………………………………………… Adjustment Description………………………………………………………. Trouble-shooting Chart………………………………………………………. Disassembly and Assembly for Repair…………………………………… Exploded View………………………………………………………………….. Part List 2………………………………………………………………………... Packing………………………………………………………………………….. PC Board View………………………………………………………………… Level Diagram………………………………………………………………… Schematic Diagram……………………………………………………………. Description of TC-700 Desktop Charger…………………………………… Specifications…………………………………………………………………...
TC-700 General 1 Revision History Edition Release Date Revised Content 8130070000000 2005/09/22 Initial release 2006/09/22 1) 2-Tone/5-Tone, add HDC1200 and HDC2400TM 2) Update schematic diagram and part list 3) Update exploded view, part list and diagram for disassembly and assembly 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. User Safety Information The following precautions are recommended for personnel safety: z DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated. z SHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive atmosphere. z When in vehicles with an airbag, do not place a portable radio in the area over an airbag or in the airbag deployment area. z Do not expose the radio to direct sunlight for a long time nor place it close to a heating source. z Do not use any portable radio with a damaged antenna. If a damaged antenna comes into contact with your skin, a minor burn may result. z When transmitting with a portable radio, hold the radio in a vertical position with its microphone about 5 centimeters away from your mouth. z If you wear a portable radio on your body, be sure to keep the antenna at least 2.5 centimeters away from your head or body when transmitting. z This equipment should be serviced by a qualified technician only.
TC-700 Brief Introduction 2Brief Introduction Control Knob and Function Key (1) PTT Key（Push-To-Talk Key） Select transmit/receive mode. Press and hold PTT, radio operates in transmit mode. Release PTT, radio returns to receive mode. (2) SK1 Key Side Key1, programmable key (3) SK2 Key Side Key2, programmable key (4) Antenna (5) Microphone (6) Speaker (7) TK Key Top Key, programmable (8) Channel Selector Knob Rotate the knob to select Channel1 to 16
TC-700 Brief Introduction 3 (9) Power/Volume Control Knob Rotate the Power/Volume Control Knob clockwise to turn the radio on; fully counter clockwise to turn the radio off. Increase or decrease volume by adjusting the volume control accordingly. (10) LED Indicator Red LED glows while transmitting; green LED glows while receiving; red LED flashes when the battery voltage is low. (11) External Jack (12) Earplug Cover Screw (13) Earplug Cover (14) Belt Clip (15) Battery (16) Belt Clip Screw (17) Charging Connector (18) Release Button
TC-700 Software Specification 4Software Specification Specification:  Conventional Mode 1. Mechanical Knob (16 channels) VHF:136～174MHz UHF:400-470MHz, 450～520MHz 2. Channel Spacing: 25/20/12.5KHz (Wide/Medium/Narrow bandwidth compatible) 3. Step: 2.5/5/6.25KHz 4. LED Indicator: Red/Green 5. 3 Programmable Function Keys 6. CTCSS/CDCSS Encode & Decode 7. DTMF Encode 8. 2-Tone (2-Tone version) / 5-Tone (5-Tone version) 9. HDC2400TM Encode & Decode 10. HDC1200 Encode & Decode 11. Squelch Mode: 1) Carrier 2) CDCSS/CTCSS 3) Optional Signalling 4) CTCSS/CDCSS AND 2-Tone/5-Tone/ HDC2400TM/HDC1200 5) CTCSS/CDCSS OR 2-Tone/5-Tone/ HDC2400TM/HDC1200 12. Scan 13. Time-Out-Timer (TOT) 14. Rent 15. Battery Save 16. Emergency 17. PTT ID 18. Busy Channel Lockout & Busy Tone Lockout Description 1. User Mode This mode is for normal operation. 2. All Reset Mode Firstly ground the SELF point, and then turn the power on while holding down TK key for 2 seconds. The radio enters all reset mode with green LED flashing twice. Turn the channel selector knob to the
TC-700 Software Specification 5selected channel and press PTT, the radio data is all reset (All clone modes will be automatically activated when All Reset is completed). Frequency settings are shown as follows: Channel data is shown as follows: Channel RX Frequency (MHZ) TX Frequency (MHZ) Signaling Power Channel Spacing 1 RX1 TX1 None H 25KHZ 2 RX3 TX3 None H 25KHZ 3 RX5 TX5 None H 25KHZ 4 RX1 RX1 None LO 20KHZ 5 RX3 RX3 None LO 20KHZ 6 RX5 RX5 None LO 20KHZ 7 RX1 RX1 None LO 12.5KHZ 8 RX3 RX3 None LO 12.5KHZ 9 RX5 RX5 None LO 12.5KHZ 10 RX3 RX3 67HZ LO 25KHZ 11 RX3 RX3 254.1HZ LO 25KHZ 12 RX3 RX3 023 LO 25KHZ 13 RX3 RX3 754 LO 25KHZ 14 RX3 RX3 2-TONE LO 25KHZ 15 RX3 RX3 5-TONE LO 25KHZ 16 RX3 RX3 None LO 25KHZ
TC-700 Software Specification 6 3. Wireless Clone Mode Select wireless clone from optional functions in programming software, turn the power on while holding down PTT and SK1 key simultaneously for 2 seconds, then the source and target radios enter wireless clone mode with orange LED flashing one time（After the source and target radios are turned on and stay in the same channel, hold down PTT on the source radio to begin cloning）. During cloning, the LED of the source radio glows red and that of the target radio glows green. The target radio flashes green and two Beeps are heard in case of successful cloning, it flashes red in case of cloning failure. 4. User Wired Clone Mode Select Wired Clone from optional functions in programming software, turn the power on while holding down PTT and SK2 key simultaneously for 2 seconds, then the source radio enters user wired clone mode with orange LED flashing twice. Then directly turn the target radio on. Hold down PTT on the source radio to begin cloning. During cloning, the LED of the source radio glows red and that of the target radio glows green. The LED of the source radio goes out in case of successful cloning, it flashes red in case of cloning failure. 5. Manual Adjust Mode Manual adjustment is performed to adjust frequency deviation, power, sensitivity, squelch, etc. Note: Prior to entry for mode startup, select Manual Adjust Mode from optional functions in programming software. Manual Adjust Mode Description (1) Enter the manual adjust mode Turn the power on by holding down TK and SK2 key simultaneously for 2 seconds, then the radio enters manual adjust mode with red LED flashing twice. (2) Channel number on the channel selector knob Each channel on the channel selector knob is defined as a setting item. 25KHz bandwidth and low frequency (F1) is set on the next channel each time the Channel Selector Knob is rotated. (3) SK2 key Used to set the frequency. 1 point tuning adjusts center frequency; 3 point tuning adjusts F1, F3, F5; 5 point tuning adjusts F1-F5. The frequency toggles from low frequency to high frequency. Green LED flashes once when F1 is selected.
TC-700 Software Specification 7 (4) TK key Use to toggle the channel bandwidth among 25 KHz, 20 KHz and 12.5 KHz. Red LED flashes once when the bandwidth is 25 KHz. (5) PTT/SK1 PTT→Increase SK1→Decrease PTT/SK1 is pressed to adjust upward/downward. Red LED glows indicating the maximum adjust value and green LED indicating the minimum value. Hold down the key to increase/decrease the adjustment value continuously. Press PTT key to save the BATT LOW, and SQL settings, then green LED glows once. (6) Select adjustment item group The first group of adjustment items is selected when the radio enters the manual adjust mode. Turn to CH16 and press PTT key to enter the next group. Press it again to return to the first group. Orange LED flashes once when the first group of adjustment items is selected and flashes twice when the second group is selected. (7) Frequency Setting 5 point tuning（MHz） TX: { TX1,TX2,TX3,TX4,TX5} RX: { RX1,RX2,RX3,RX4,RX5} 3 point tuning（MHz） TX: { TX1, TX3, TX5} RX: { RX1, RX3, RX5} 1 point tuning（MHz） TX: { TX3} RX: { RX3}
TC-700 Software Specification 8First Group of Adjustment Items Channel No. Adjustment Item Remarks 25KHz 20KHz 12.5KHz 1 TX power LOW 5 point tuning 2 CDCSS PLL balance 3 point tuning (wideband) 3 CDCSS deviation 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 4 CTCSS deviation LOW (67Hz) 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 5 CTCSS deviation CENTER (136.5Hz) 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 6 CTCSS deviation HIGH (254.1Hz) 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 7 AK2346 audio deviation (TX) 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 8 2 TONE deviation 1 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 9 DTMF deviation 1 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 10 MSK deviation 3 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 11 TX power HIGH 5 point tuning 12 TX voltage LOW 1 point tuning
TC-700 Software Specification 9 6. PC Adjust Mode Select test mode from programming items in programming software and then begin adjustment. Second Group of Adjustment Items Channel No. Adjustment Item Remarks 25KHz 20KHz 12.5KHz 1 RX sensitivity 5 point tuning 2 AK2346 volume (RX) 1 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 3 Squelch level 3 (OPEN) 5 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 4 Squelch level 3 (SQUELCH) 5 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 5 Squelch level 9 (OPEN) 5 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 6 Squelch level 9 (SQUELCH) 5 point tuning (wideband) 1 point tuning 1 point tuning (narrowband) 7 RX voltage LOW 1 point tuning
TC-700 Circuit Description 10Circuit Description 1. Power Supply Power supply of the radio is derived from the battery, which supplies battery B+ after passing through fuse 3A and then feeds through power switch. The power supplies voltage for three AVRs. IC504 supplies 5V (M5V) voltage for the control circuit. And IC503 supplies 5V (C5V) voltage for the shared circuit. IC502 supplies voltage for the transmit/receive circuit. In transmit mode, T5C becomes low voltage and Q502 is turned on to supply 5V (T5v) voltage for the transmit circuit. In receive mode, R5C becomes low voltage and Q504 is turned on to supply 5V (R5V) voltage for the receive circuit. Fig. 1 Power Supply Block Diagram 2. PLL Frequency Synthesizer PLL circuit generates the first local oscillator signal for reception and RF signal for transmission. Fig.2 PLL Block Diagram
TC-700 Circuit Description 11 1） PLL Circuit Step frequency of PLL can be 2.5 KHz, 5.0 KHz or 6.25 KHz. A 16.8MHz reference oscillator signal is divided at IC301 by a counter to generate a 2.5 KHz, 5.0 KHz or 6.25 KHz reference frequency. Output signal from VCO is buffer amplified by Q301 and divided at IC301 by a frequency divider. The divided signal is compared with 2.5 KHz, 5.0 KHz or 6.25 KHz reference signal in the phase comparator of IC301. The output signal from phase comparator is filtered through a low pass filter to generate a level D.C., and the level D.C. controls oscillator frequency by controlling VCO. 2） VCO The operating frequency is generated by Q302 in transmit mode and by Q307 in receive mode. Operating frequency generate a control voltage by phase comparator to control varactor diodes so that the oscillator frequency is consistent with the MCU preset frequency(D301、D302、D303 and D304 in transmit mode, and D307、D308、D309 and D310 in receive mode). T/R pin is set high level in receive mode, and low level in transmit mode. The output from Q302 and Q307 is amplified by Q304 and sent to buffer amplifier. 3） Unlock Detector An unlock condition appears if low level appears at MUXOUT pin of IC301. Transmission is forbidden if this condition is detected by microprocessor. 3. Receiver The receiver utilizes double conversion superheterodyne (UHF)/(VHF). Fig. 3 Receiver Section Configuration 1） Front-end RF Amplifier The signal from antenna is amplified at RF amplifier (Q207) after passing through a transmit/receive circuit and a band pass filter. Before passing the first mixer, the amplified signal is filtered through another band pass filter to remove unwanted signals. 2） First Mixer The signal from RF amplifier is mixed with the first local from PLL frequency synthesizer circuit at the fix mixer (IC202) to create a 49.95MHz first IF signal. The first IF signal is then fed through a crystal filter (XF203) to further remove unwanted signals.
TC-700 Circuit Description 12 3） IF Amplifier The first IF signal is amplified by Q206 before passing through crystal filter and by Q204 after crystal filter and then enters IF processing chip IC204. The signal from IC204 is mixed with the second oscillator signal again in IC204 to create a 450 KHz second IF signal. The second IF signal then passes through a 450KHz ceramic filter (wideband: CF201，narrowband: CF202) to eliminate unwanted signals before it is amplified and detected in IC204. 4） Narrowband/Wideband Switch Circuit Pin WCON and NCON of IC500 outputs wideband (high level) and narrowband (low level) controlling signal respectively to turn on corresponding diode-connector, and to choose ceramic filter CF201 (wideband) or CF202 (narrowband) to filter useless spurious signal. 5） AF Amplifier The resulting AF signal from IC204 enters base band processing chip IC408. The processed AF signal is then amplified by an AF power amplifier (IC401) to drive the speaker. 4. Transmitter 1） AF and Signaling AF signal from the microphone is amplified and low-pass-filtered in IC402 before it enters base band processing chip IC408, which also enters CTC/CDC/DTMF/2-Tone/5-Tone etc signaling generated by CPU. The IC408 processed mixing signal enters VCO for direct FM modulation (see fig.5). 2） RF Power Amplifier The transmit signal from VCO buffer amplifier (Q111) is amplified by Q101 and Q102. The amplified signal is then amplified by the power amplifier Q103 and Q104 (including a two-stage FET amplifier) to create 4.0W (UHF)/5.0W (VHF) RF power (see Fig. 6). Fig. 4 APC System
TC-700 Circuit Description 13 3） Antenna Switch and LPF Output signal from RF amplifier passes through a low-pass filter network and a transmit/receive switch circuit comprised of D102，D103 and D104 before it reaches the antenna terminal. D103 and D104 is turned on (conductive) in transmit mode and off (isolated) in receive mode. 4） APC The automatic power control (APC) circuit stabilizes the transmit output power by detecting the drain current of final stage amplifier FET. IC101 (2/2) compares the preset reference voltage with the voltage obtained from final current. APC voltage is proportional to the difference between auto detect voltage and reference voltage output from IC101 (1/2). The output voltage controls FET power. 5. Base Band and Signaling System The block diagram of signaling section is shown as figure 5. Fig. 5 AF and Signaling Circuit 1） CTC/CDC Transmit: CTC/CDC signaling produced by CTC_PLL pass a low pass filter and then enters VCXO. CTC/CDC signaling produced by CTC_OUT pass a low pass filter and then mixed with AF before enters VCO. Receive: Demodulated signal enters MCU after pass IC404、IC405. MCU then judges whether CTC/CDC matches the preset values or not. According the result, the out tone will be controlled by AFMUTE. 2） 2-Tone / 5-Tone and DTMF Transmit: The signal produced by MCU provides a TX and SP out tone, and is then applied to the base band processing IC. The signal in mixed with the audio signal and goes to the VCO。 Receive: Demodulated signal is filtered after passing base band processing IC, and then enters MCU for decoding.
TC-700 Circuit Description 14 3） MSK Transmit: MSK signal produced by base band processing IC enters VCO together with AF signal for modulation. Receive: MSK input of demodulating IC is sent to AK2346 for demodulation after being amplified. The demodulated signal is then sent to MCU for decoding. 4） AF Transmit: AF signal from MIC enters base band processed IC for amplification, pre-emphasis etc. after being amplified. And then it enters VCO for modulation. Receive: Demodulated AF signal enters the base band processing IC for amplification, de-emphasis etc. after being amplified. And then it enters AF power amplifier drived speaker. Base band processed chip provides functions for processing signal as amplifying, filtering, emphasizing, scrambling, companding, and amplitude limiting. 6．Control System The IC500 CPU operates at 9.8304 MHz. The block diagram of MCU control system is shown as following： Fig.6 MCU Block Diagram Circuit in this section is mainly comprised of MCU, EEPROM etc. MCU control circuit accomplishes the following functions: accomplish the reset initialization according to the programmed feature of the radio when power on; detect keying signal and monitor battery voltage; send necessary frequency data to PLL according to encode of the channel; switch and control transmit/receive according to the signal input from PTT; turn on/off the mute circuit according to the input signaling decode signal and squelch level signal; output control signal to control the light/off of LED; control signaling process IC to perform tasks. EEPROM
TC-700 CPU Pins 15CPU Pins 1. CPU pins are as follows: No. MCU Port Name Port Name Input/Output Features 1 P94/DA1 APC/TV O Automatic Power Control 2 P93/DA0 TONEO O DTMF/2-5Tone/Beep tone output/ ALARM tone output 3 P92/TB2IN NC O NC 4 P91 O 5 P90 SHIFT O Clock beat-frequency 6 BYTE BYTE I 7 CNVSS CNVSS I 8 P87/XCIN O 9 P86/XCOUT O 10 RESET RESET I Input low level to enter all reset mode 11 XOUT XOUT O Crystal oscillator output pin 12 VSS GND I GND 13 XIN XIN I Crystal oscillator output pin 14 VCC VCC I VCC 15 P85/NMI NMI I 16 P84/INT2 AFCK I 2346 TCLK 17 P83/INT1 AUX1 O Indication for external scrambler 18 P82/INT0 AFRDF I 2346 RDF 19 P81 O 20 P80 PTTCO O PTTCO 21 P77 NC O 22 P76/TA3O CTCOUT O CTC _OUT (PWM) TO VCO 23 P75 NC O 24 P74/TA2O CTC_PLL O CTC_PLL (PWM) 25 P73 AUX2 COM5 Indication for receive/transmit status 26 P72/TA1O 1/2OSC O 27 P71/RxD2/TB5IN TONEI O 28 P70/TxD2 29 P67/TxD1 TXD O Serial date output. 30 P66/RxD1 RXD I Serial date input. 31 P65 I 32 P64 O 33 P63/TxD0 I COM4 MANDOWN Input Pin 34 P62/RxD0 O COM3
TC-700 CPU Pins 1635 P61 COM1 36 P60 COM2 37 P57/RDY EEDAT I/O EEPROM DATA, date input/output. 38 P56/ALE EECLK O EEPROM CLK 39 P55/HOLD 40 P54/HLDA AFDIR O AK2346 DIR 41 P53/BLCK AFSCK O 2346 SCLK 42 P52/RD NC O 43 P51/BHE AFDT O 2346 TDATA 44 P50/WR WE I 45 P47/CS3 CODIO I/O Common date control (AK2346 DATA). 46 P46/CS2 47 P45/CS1 SAVE O SAVE, power save control 48 P44/CS0 R5C O R5C Rx circuit power supply control 49 P43/A19 T5C O T5C Tx circuit power supply control 50 P42/A18 51 P41/A17 52 P40/A16 53 P37/A15 54 P36/A14 55 P35/A13 56 P34/A12 57 P33/A11 58 P32/A10 59 P31/A9 60 Vcc VCC I VCC 61 P30/A8 NCON O Narrowband control 62 Vss GND I GND 63 P27/A7 AFCO O AFCO 64 P26/A6 WCON O Wideband control 65 P25/A5 LEDR O Red light control：H，lit；L，out 66 P24/A4 LEDG O Green light control：H，lit；L，out 67 P23/A3 EN2 I EN2 68 P22/A2 EN4 I EN4 69 P21/A1 EN3 I EN3 70 P20/A0 EN1 I EN1 71 P17/INT5 72 P16/INT4 AFMUTE
TC-700 CPU Pins 17 73 P15/INT3 74 P14 TK I Top Key 75 P13 DC-Switch O 76 P12 PLL_UL I PLL unlock detect 77 P11 PLL_STB O PLL strobe output 78 P10 MICMUTE O MICMUTE 79 P07/D7 Option1 I Programming cable detect. 80 P06/D6 PLL_DATA O PLL date input 81 P05/D5 PLL_CLK O PLL clock output 82 P04/D4 T/R O Receive/transmit control 83 P03/D3 APC-Switch O 84 P02/D2 PTT I PTT 85 P01/D1 SK1 I Side Key1 86 P00/D0 SK2 I Side Key2 87 P107/AN7 I MIC signal input 88 P106/AN6 BATT I BATT, battery voltage detect 89 P105/AN5 BATTSEL I Battery detect 90 P104/AN4 NC I 91 P103/AN3 SELF I Reset mode control：ground this pin to enter reset mode. 92 P102/AN2 RSSI I RSSI detect pin 93 P101/AN1 SQL I Squelch level input 94 AVSS GND I A/D conversion power supply input. 95 P100/AN0 CTCIN I CTCSS output 96 VREF VCC I A/D conversion reference voltage 97 AVCC VCC I A/D conversion power supply input. 98 P97 O 99 P96 O 100 P95 O
TC-700 Part List 1 18TC-700 Part List 1
TC-700 Adjustment Description 19Adjustment Description Adjust the radio by PC programming software or by manual adjustment. In manual adjustment mode, the adjustment method is shown as follows: (Refer to “Software Specification” for the manual adjustment mode) Required Test Instrument Radio Communication Test Set 1 set Scanner 1 set 3A/10V Power Supply 1 set Digital Voltmeter 1 set 3A Ammeter 1 set Adjustment 1. Adjustment in user mode Firstly ground the SELF point, turn on the power by holding down TK for 2 seconds, and then the radio enters reset mode with green LED flashing twice. Turn the channel selector knob to the selected channel and press PTT, the radio data is all reset (All clone modes will be automatically activated when reset is completed). Refer to All Reset Mode in Software Specification for more details: VCO Measurement Adjustment Item Condition Test Instrument Terminal Parts Method Specification/Remarks 1. Setting Power supply voltage 1. CH: TX high 3.9V±0.1V 2.Transmit VCO lock voltage 2. TX Low Check >0.5V 1. CH: RX high 3.9V±0.1V 3.Receive VCO lock voltage 2. RX low Digital Voltmeter CV TC301TC302Check >0.5V 2. Manual Adjust Mode Description (1) Enter the manual adjust mode Turn the power on by holding down TK and SK2 key simultaneously for 2 seconds, the radio enters manual adjust mode with red LED flashes twice. (TK: Top key; SK1: Side key1; SK2: Side key2) (2) Channel number on the channel selector knob Each channel number on the channel selector knob is defined a setting item. The bandwidth is 25 KHz and low frequency (F1) each time the channel selector knob is rotated.
TC-700 Adjustment Description 20 (3) SK2 key Used to set the frequency. 1 point tuning is used to adjust center frequency, 3 point tuning adjusts F1, F3, F5 and 5 point tuning adjusts F1-F5. The frequency toggles from low frequency to high frequency. Green LED flashes once when F1 is selected. (4) TK key Use to toggle the channel bandwidth among 25 KHz, 20 KHz and 12.5 KHz. Red LED flashes once when the bandwidth is 25 KHz. (5) PTT/SK1 PTT→Increase SK1→Decrease PTT/SK1 is pressed to adjust upward/downward. Red LED glows indicating the maximum adjust value and green LED indicating the minimum value. Hold down the key to increase/decrease the adjust value continuously. Press PTT key to save the BATT LOW and SQL settings, then green LED glows once. (6) Select adjustment item group The first group of adjustment item is selected when the radio enters the manual adjust mode. Turn to CH16 and press PTT key to enter the next group. Press again to return to the first group. Orange LED flashes once when the first group is selected. Orange LED flashes twice when the second group is selected. (7) Frequency Setting (can be set via programming software) 5 point tuning（MHz） TX: { TX1,TX2,TX3,TX4,TX5} RX: { RX1,RX2,RX3,RX4,RX5} 3 point tuning（MHz） TX: { TX1, TX3, TX5} RX: { RX1, RX3, RX5} 1 point tuning（MHz） TX: { TX3} RX: { RX3}
TC-700 Adjustment Description 21 3. Adjustment Method Turn the power on by holding down TK and SK2 key simultaneously for 2 seconds, the radio enters manual adjust mode with red LED flashes twice. Refer to Manual Adjust Mode in TC-700 Software Specification for more details. (1) Transmitter Item Condition Test Instrument Method Purpose Adjust a channel Enter the adjust mode; Turn to CH1; TX mode. Radio Communication Test Set; TX Test Adjust VR1 Frequency Error ≤100Hz 1. TX power Low Enter the adjust mode. Turn to CH1. Adjust at 5 point (wideband). PTT key (increase) SK1 key (decrease) Adjust power to: 1W±0.1W 2. CDCSS balance Enter the adjust mode. Turn to CH3. Adjust at 3 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. PTT key (increase) SK1 key (decrease) No adjustment 3. CDCSS deviation Enter the adjust mode. Turn to CH3. Adjust at 3 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. PTT key (increase) SK1 key (decrease) 4. CTCSS (67.0Hz) deviation Low Enter the adjust mode. Turn to CH4. Adjust at 3 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. PTT key (increase) SK1 key (decrease) Group 1 5. CTCSS (136.5Hz) deviation Center Enter the adjust mode. Turn to CH5. Adjust at 3 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. Radio Communication Test Set TX TEST HPF：20HZ LPF：300HZ PTT key (increase) SK1 key (decrease) Adjust deviation to 750Hz (wideband), 600Hz (medium band) and 400Hz (narrowband) respectively.
TC-700 Adjustment Description 22 6. CTCSS (254.1Hz) deviation High Enter the adjust mode. Turn to CH6. Adjust at 3 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. PTT key (increase) SK1 key (decrease) 7. AK2346 Transmit Audio Deviation Enter the adjust mode. Turn to CH7. Adjust at 3 point (wideband), 1 point (medium band), 1 point (narrow band). Radio Communication Test Set HPF: 20Hz LPF: 15KHz 1KHz 120mV PTT key (increase) SK1 key (decrease) Adjust deviation to 4KHz (wideband), 3.2KHz (medium band) and 2KHz (narrowband) respectively. 8. 2 Tone deviation Enter the adjust mode. Turn to CH8. Adjust at 1 point (wideband), 1 point (medium band), 1 point (narrow band). PTT key (increase) SK1 key (decrease) Adjust deviation to 3.2KHz (wideband), 2.5KHz (medium band) and 1.8KHz (narrowband) respectively. 9. DTMF deviation Enter the adjust mode. Turn to CH9. Adjust at 1 point (wideband), 1 point (medium band), and 1 point (narrow band). PTT key (increase) SK1 key (decrease) Adjust deviation to 3.2KHz (wideband), 2.5KHz (medium band) and 1.8KHz (narrowband) respectively. Group 1 10. MSK deviation Enter the adjust mode. Turn to CH10. Adjust at 3 point (wideband), 1 point (medium band), 1 point (narrow band). Radio Communication Test Set TX Test HPF: 20Hz LPF: 15KHz No modulation signal. PTT key (increase) SK1 key (decrease) Adjust deviation to 3.2KHz (wideband), 2.5KHz (medium band) and 1.8KHz (narrowband) respectively.
TC-700 Adjustment Description 23 11. TX power HIGH Enter the adjust mode. Turn to CH13. Adjust at 5 point (wideband). PTT key (increase) SK1 key (decrease) Adjust power to 5W(4W)±0.1W VHF: 5W, UHF: 4W Group 1 12. TX voltage Low Enter the adjust mode. Turn to CH14. Adjust at 1 point (wideband). Radio Communication Test Set TX TEST Save Adjust voltage to 5.8V,press PTT to save
TC-700 Adjustment Description 24 Receiver Item Condition Test Instrument Method Purpose 1. RX sensitivity Enter the adjust mode. Turn to CH1. Adjust at 5 point (wideband). PTT key SK1 key Adjust level to 119dBm. SINAD≥12dB 2. AK2346 RX volume Enter the adjust mode. Turn to CH2. Adjust 1 point at wideband, medium band and narrowband respectively. PTT key (Increase) SK1 key (Decrease When Max. volume is set, adjust AC level to 1W (16Ω), single input 2.5V, dual input 5V 3. Squelch Level 3 (OPEN) Enter the adjust mode. Turn to CH3. Adjust at 5 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. Save Adjust level to -123dBm，press PTT to save 4. Squelch Level 3 (SQUELCH) Enter the adjust mode. Turn to CH4. Adjust at 5 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. Save Adjust level to -125dBm，press PTT to save 5. Squelch Level 9 (OPEN) Enter the adjust mode. Turn to CH5. Adjust at 5 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. Save Adjust level to -117dBm，press PTT to save 6. Squelch Level 9 (SQUELCH) Enter the adjust mode. Turn to CH6. Adjust at 5 point (wideband), 1 point (medium band) and 1 point (narrowband) respectively. Save Adjust level to -119dBm，press PTT to save Group 2 7. RX voltage Low Enter the adjust mode. Turn to CH7. Adjust at 1 point (wideband). Radio Communication Test Set RX TEST HPF：300HZ LPF：3KHZ Save Adjust power supply voltage to 6.3V, press PTT to save Note: AF deviation of the receiver is 3KHz (wideband)，2.5KHz(medium band) and 1.5KHz (narrowband)
TC-700 Disassembly and Assembly for Repair 25Trouble-shooting Chart Normal power-on alert tone?MCU Check The RF circuit can’t be driven.YesSpeaker works well?NOReplace the speakerNO`9.8304MHz works normally? YesRead available?YesQ501 works well? Exchange Q501NOCheck M5VMCU works wellPin10 is of high level?YesYesYesCheck the control circuitNO Check the circuit of read frequencyYes ResetNO
TC-700 Disassembly and Assembly for Repair 26 Power supply is normal? VCO Check Exchange Q306NOOscillator CV voltage in Rx is normal?YesCheck if Q305 works well.NO NO`Check if Q304 output normally? YesExchange Q305Check Q304NOYesCheck if feedback is normal.Check Q301NOCheck power supply circuit.Check CPU data circuit Check if 16.8MHz oscillates? YesYesYesNO
TC-700 Disassembly and Assembly for Repair 27 No output powerPower supply works well?Check power supply circuitCheck Q502Check drive stage Check transistor offset voltage and low pass networkRepair the transmission networkCheck the suited networkVCOCheck flow chart Exchange Q102Exchange Q101FinishedFinishedFinishedControl voltage is normal?The current is normal?Driver stage is normal?The power is normal?If the power is normal.If the power is normal. NOYes NO Low HighYesNO NOYes YesYes Yes NONO
TC-700 Disassembly and Assembly for Repair 28Check if the power supply of AF IC is normal?No recieveCheck if the output of base band IC is normal.Check if control voltage AFCO is normal.Check if the input of base band IC is normal.Exchange AK2346Check the output of IC204 is normal.Check the second local oscillator is normal.Check the voltage of CD201 is normal.Check if PIN 16 outputs in IF inputCheck if T1 outputs in RF input Exchange CD201 Check Q308 Check IC404Exchange ICExchange 717Check the status of IC204Check VCOCheck volume knob & AFMUTEYesNONO YesNONONONONONOYesYesYesNOYesYesYesCheck Q207 passageYes
TC-700 Disassembly and Assembly for Repair 29 Disassembly and Assembly for Repair 1. Remove the case assembly from the chassis (as shown in Fig. 1) 1. Remove the volume knob and channel knob①. 2. Remove the two screws ②. 3. Lift the both sides of chassis from the case assembly ③. Fig. 1 2. Remove the speaker (as shown in Fig. 2) 1. Remove the three screws on the fixing ring of the speaker ④ and take out the fixing ring ⑤. Note: be careful not to snap the speaker’s lead wire. 2. Take out the speaker and water-proof gasket ⑥. Fig. 2 3. Removing the Tx-Rx unit from the chassis (as shown in Fig. 3) 1. Loosen the nut on channel switch ⑦ and that on volume switch ⑧, and remove earphone holder ⑨. 2. Remove the screw ⑩ on the PTT key board. 3. Remove the ten screws ⑾ fixing the control board. 4. Remove the solder of the antenna terminal with a soldering iron ⑿.
TC-700 Disassembly and Assembly for Repair 305. Remove the solder of the positive and negative terminal on the battery’s connector with a soldering iron ⒀. 6. Lift and remove the main unit board ⒁ from the chassis. Fig. 3 Cautions for assembly: 4. Attaching the case assembly and chassis (as shown in Fig. 4, 5 & 6) 1. Make sure the water-proof packing attached to the circumference of the chassis is securely inserted in the groove of the chassis ①. 2. Attach speaker and its water-proof ring to the corresponding place on the chassis ②. Note: ensure the speaker and the ring is securely inserted. Fig. 4 3. Press the stainless fixing ring on the water-proof packing of the speaker, and attach the screw ③. 4. Insert the upper part of the chassis into the case assembly ④. Note: Make sure the speaker lead wire does not press on the microphone magnetic core. 5. Press downward the chassis ⑤, enabling the chassis and the case to fit together. Note: If the packing of the SP/MIC does not come to the correct position after attaching the chassis to the case assembly, reposition the packing with your fingers.
TC-700 Disassembly and Assembly for Repair 31Fig. 5 Fig. 6
TC-700 Exploded View 44Exploded View 16910151920212228 293041A4242 432BA1C1435 3433323111A2324123457612131718B40393826EDAAAFCE6TX-RX Unit2737 36258
TC-700U(2) Part List 2 46TC-700 Part List 2 No. P/N Part Description Qty1 6000135000000 TC-700S PTT key cover Black 1.00 2 6100068000000 TC-700S PTT silica rubber key Black 1.00 3 8600700500000 TC-700 Model label 1.00 4 8600700500100 HYT-LOGO Logo 1.00 5 6000076000020 TC700 Knob (encoder) 1.00 6 6201006000000 TC2088 Inner liner knob 2.00 7 6000136000000 TC-700S Light guide 1.00 8 750700S000000 TC700S Light guide 3M (9448) adhesive paper 1.00 9 6000077000020 TC700 Knob (volume) 1.00 10 6000134000000 TC-700S Rear cover (main unit) 1.00 11 6000138000000 TC-700S Dust-proof cover 1.00 12 7400051000000 TC700S Mic mesh 1.00 13 7400054000000 Speaker mesh 1.00 14 5001040000000 Speaker 16Ω 1W D: 40mm 1.00 15 6100066000000 TC-700S Water-proof gasket (speaker) 1.00 16 6201078000000 TC-700S Stainless fixing ring (speaker) 1.00 17 7207005400000 Nut M7.0*5.4mm 1.00 18 7206004200000 Nut M6.0*4.2mm 1.00 19 6100069000000 TC-700S Water-proof gasket (volume knob) 2.00 20 6100065000000 TC-700S Water-proof gasket (main unit) 1.00 21 6100070000000 TC-700S Water-proof gasket (battery connector) 1.00 22 5202003100010 TC-700S 3P battery connector socket 1.00 23 6000137000000 TC-700S Mic holder Black 1.00 24 6300016000000 TC-700S Aluminum chassis 1.00 25 7300001000000 TC700S PTT metal dome (3-key) 1.00 26 4210047000000 TC-700 Key board connection cable 47mm 0.50 27 4100700101100 TC-700S PT PCB FR4 0.6T/2L 1.00 28 7500114000000 TC500 Gap pad 1.00 29 4400000000000 SMA-type MSMA1551D5-001-NT3G-50 connector Male 1.00 30 6100067000000 TC-700S Antenna water-proof gasket 1.00 31 5002110000020 Mic cover CZII-T6027P-C33 -60dB±3dB φ6.0*2.27 1.00 32 4304030000010 Gray-code encoder switch 1.00 33 7500044000000 TC700 Volume switch pad 1.0mm-thick 1.00 34 4302020000040 Volume switch TC3000 TP76N17N 15F(A103) 1.00 35 5205000000280 Speaker jack HSJ1456-010320 1.00 36 7400023000010 TC-500 PVC sheet 0.2mm-thick 2.00 37 5205000000190 Earpiece jack HSJ1650-010020 1.00 38 3920450300000 Demodulator plug-in 450KHz±4kHz 1.00 39 3801045030090 Ceramic filter 450KHz±6.0KHz 1.00 40 6000128000000 TC-700 Battery latch Black 1.00
TC-700U(2) Part List 2 4641 6201078000000 TC-700S Battery latch baffle 1.2mmSUS304 1.00 42 7000036000000 TC-700S Spring Ф0.35*Ф2.3*10mm 2.00 43 6000133000000 TC-700S Main unit front case Black 1.00 A 7101904020020 Self-tapping ST1.9*4.0mm 13.00B 7102504000300 Machine screw M2.5*4.0mm Ultra-thin cross-head 2.00 C 7102004520000 Self-tapping ST2.0*4.5mm pan head 2.00 D 7103006001000 Machine screw M3.0*6.0mm pan head 2.00 E 7102508000000 Machine screw M2.5*8.0mm Hex wobbler 2.00 F 7102004020050 Self-tapping ST2.0*4.0mm cross recessed pan head 1.00
TC-700 Packing 47Packing
Description of TC-700 Desktop Charger 56Description of TC-700 Desktop Charger Ⅰ. General Description The charger is developed & designed for TC-700 wireless series. The charger adopts bq2000T——a programmable multi-chemistry fast-charge management IC. The charger is for fast-charge management of nickel cadmium (Ni-Cd), nickel metal-hydride (Ni-MH), or lithium-ion (Li-Ion) batteries in single or multi-chemistry applications. High-frequency switching controller for efficient and simple charge design, provides over 90% efficiency rating. Ⅱ. General description of bq2000T functions The bq2000T detects the battery chemistry and proceeds with the optional charging and termination algorithms. This process eliminates undesirable undercharged or overcharged conditions and allows accurate and safe termination of fast charge. Depending on the chemistry, the bq2000T provides a number of charge termination criteria: z Peak voltage detection (PVD) (for NiCd and NiMH) z Minimum charging current (for Li-Ion) z Maximum temperature z Maximum charge time Pin Connections
Description of TC-700 Desktop Charger 57 Pin Names and Descriptions: SNS: Current-sense input Enables the bq2000T to sense the battery current via the voltage developed on this pin by an external sense-resistor connected in series with the battery pack. Vss: System ground LED: Charge-status output Open-drain output that indicates the charging status by turning on, turning off, or flashing an external LED. BAT: Battery-voltage input Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates this input. TS: Temperature-sense input Input for an external battery-temperature monitoring circuit. An external resistive divider network with a negative temperature-coefficient thermistor sets the lower and upper temperature thresholds. RC: Timer-program input RC input used to program the maximum charge-time, hold-off period, and trickle rate during the charge cycle, and to disable or enable top-off charge. Vcc: Supply-voltage input MOD: Modulation-control output Push-pull output that controls the charging current to the battery. MOD switches high to enable charging current to flow and low to inhibit charging current flow.
Description of TC-700 Desktop Charger 58 Charge Termination 1. Maximum Charge Time (NiCd, NiMH, and Li-Ion) The bq2000T sets the maximum charge-time through pin RC. With the proper selection of external resistor and capacitor, various time-out values may be achieved. Figure Ⅱshows a typical connection. Figure Ⅱ Typical Connection for the RC Input 2. Maximum Temperature (NiCd, NiMH, and Li-Ion) During fast charge, the bq2000T compares the battery temperature to an internal high-temperature cutoff threshold, VTCO. As shown in Figure Ⅲ, high-temperature termination occurs when voltage at pin TS is less than this threshold. Figure Ⅲ Temperature Monitoring Configuration 3. Peak Voltage Detection (Ni-Cd, Ni-MH battery) (PVD) bq2000T adopts PVD method to stop the charging of Ni-Cd and Ni-MH batteries. It continuously samples the voltage of BAT pin which reflects the voltage of the whole battery. Bq2000T begins PVD function if this voltage is less than the maximum sampling voltage 3.8mv (PVD). As shown in Fig. IV, the resistor-divider between the anode of the battery clip and Vss pin determines the voltage of BAT pin.
Description of TC-700 Desktop Charger 59 Figure Ⅳ Battery Voltage Divider For Li-Ion battery packs, the resistor values RB1 and RB2 are calculated by the following equation: Where N is the number of cells in series. The end-to-end input impedance of this resistive divider network should be at least 200KΩ and no more than 1MΩ. A NiCd or NiMH battery pack consisting of N series-cells may benefit by the selection of the RB1 value to be N-1 times larger than the RB2 value. In a mixed-chemistry design, a common voltage divider is used as long as the maximum charge voltage of the nickel-based pack is below that of the Li-Ion pack. Otherwise, different scaling is required. 4. Charge Current Control The bq2000T controls the charge current through the MOD output pin. The current-control circuit supports a switching-current regulator with frequencies up to 500kHz. The bq2000T monitors charge current at the SNS input by the voltage drop across a sense-resistor, RSNS, in series with the battery pack. See Figure Ⅴ for a typical current-sensing circuit. RSNS is sized to provide the desired fast-charge current (IMAX). If the voltage at the SNS is lower than VSNSLO or higher than VSNSHI, the bq2000T switches the MOD output high to pass charge current to the battery. When the SNS voltage is less than VSNSL or greater than VSNSHI, the bq2000T switches the MOD output low to shut off charging current to the battery. Figure Ⅴ Current-Sensing Circuit
Description of TC-700 Desktop Charger 60 Ⅲ. Specifications 1. Output voltage and current Input: 12±3V 1000mA Output: 8-12V 20～1000mA (Input: 12V 1000mA DC Output: 800mA DC） 2. Charging current 1) Li-ion battery Fast charging current: 800±200mA Minimum charging current: 75±20mA 2) Ni-MH battery Fast charging current: 850±100 mA Supplementary charging current: 65±10mA Trickle charging current: 25~35mA IV. Charging process and indicator 1. Li-ion battery 1) Constant-current charging: charging current is 800±200mA and the indicator turns red. The battery switches to constant voltage charging when the voltage rises to 8.4±0.1V. 2) Constant voltage charging: with 8.4±0.1V voltage and indicator turns red. 3) Completed: battery voltage: 8.4±0.1V; the minimum charging current drops to 75±20mA; LED indicator turns green. 2. Ni-MH battery 1) Fast charge: current: 850±100mA; LED indicator: red; switch to supplementary charging when rate of temperature rise dT/dt=0.9～1/min or the temperature rises to 50℃. 2) Supplementary charging: charging current: 65±10mA; LED indicator: green; switch to trickle charging if the supplementary charging time reaches or exceeds MTO. 3) Trickle charging: charging current: 25~35mA; LED indicator: green.
TC-700 Specifications 64Specifications General Frequency Range VHF: 136-174MHz UHF:300-350MHz,350-390MHz, 400-450MHz, 420-470MHz 440-490MHz,470-520MHz Number of Channels 16 Channel Spacing 25 /20/12.5 KHz Operating Voltage 7.5 V Battery Life About 14 hours (5-5-90 duty cycle) Operating Temperature Range -20 ℃— +50℃ Dimensions and Weight 119 mm×54mm×46mm、400 g Receiver Reference Sensitivity 0.25/0.35 μV Adjacent Channel Selectivity 70/60dB Intermodulation Rejection 65dB Spurious Response 70dB Audio Power Output 1W Frequency Stability ±2.5 ppm Transmitter RF Power Output 3.5W/2W/1W Spurious and Harmonics -36dBm<1GHz -30dBm>1GHz Modulation Limitation ±5/4/3kHz FM Noise 45/40dB Audio Distortion ≤5% Frequency Stability ±2.5 ppm The specifications are tested according to EIA-603 and are subject to change without notice due to enhancement in technology.

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