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………………………………………………………………………...
TC-700 General Revision History Edition 8130070000000 Release Date Revised Content 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.
TC-700 Brief Introduction Brief 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.
TC-700 Brief Introduction (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.
TC-700 Software Specification Software 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.
TC-700 Software Specification selected channel and press PTT, the radio data is all reset (All clone modes will be automatically activated when All Reset is completed).
TC-700 Software Specification 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）.
TC-700 Software Specification (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.
TC-700 Software Specification First Group of Adjustment Items Channel No. Adjustment Item Remarks 25KHz 20KHz 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 3 point tuning (wideband) 1 point tuning 4 CTCSS deviation LOW (67Hz) CTCSS deviation CENTER 12.5KHz 1 point tuning (narrowband) 1 point tuning (narrowband) 1 point tuning 5 (136.
TC-700 Software Specification Second Group of Adjustment Items Channel No. Adjustment Item Remarks 25KHz 6.
TC-700 Circuit Description Circuit 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.
TC-700 Circuit Description 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.
TC-700 Circuit Description 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.
TC-700 Circuit Description 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.
TC-700 Circuit Description 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.
TC-700 CPU Pins CPU Pins 1. CPU pins are as follows: No.
TC-700 CPU Pins 35 P61 COM1 36 P60 COM2 37 P57/RDY EEDAT I/O EEPROM 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 44 P50/WR WE I 45 P47/CS3 CODIO I/O Common date control (AK2346 DATA).
TC-700 CPU Pins 73 P15/INT3 74 P14 TK I 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.
TC-700 Part List 1 TC-700 Part List 1 18
TC-700 Adjustment Description Adjustment 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.
TC-700 Adjustment Description (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.
TC-700 Adjustment Description 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 Adjust a channel Condition Test Instrument Method Purpose Enter the adjust mode; Radio Adjust Frequency Error Turn to CH1; Communication VR1 ≤100Hz TX mode. Test Set; Enter the adjust mode.
TC-700 Adjustment Description Enter the adjust mode. 6. CTCSS (254.1Hz) deviation High Turn to CH6. Adjust at 3 PTT key (increase) point (wideband), 1 point SK1 key (medium band) and 1 (decrease) point (narrowband) respectively. 7. AK2346 Transmit Audio Deviation Radio Adjust deviation to Enter the adjust mode. Communication 4KHz (wideband), Turn to CH7. Adjust at 3 Test Set PTT key (increase) 3.
TC-700 Adjustment Description Adjust power to Group 1 11. TX power HIGH Enter the adjust mode. Radio Turn to CH13. Adjust at 5 Communication point (wideband). PTT key (increase) SK1 key (decrease) 5W(4W)±0.1W VHF: 5W, UHF: 4W Test Set TX TEST 12. TX voltage Low Enter the adjust mode. Adjust voltage to Turn to CH14. Adjust at 1 Save point (wideband). 5.
TC-700 Adjustment Description Receiver Item Condition Method Purpose Enter the adjust mode. Turn to PTT key Adjust level to CH1. SK1 key 119dBm. Test Instrument 1. RX sensitivity Adjust at 5 point (wideband). SINAD≥12dB Enter the adjust mode. Turn to 2. AK2346 RX volume PTT key CH2. Adjust 1 point at (Increase) wideband, medium band and SK1 key narrowband respectively. (Decrease When Max. volume is set, adjust AC level to 1W (16Ω), single input 2.
TC-700 Disassembly and Assembly for Repair Trouble-shooting Chart MCU Check Normal power-on alert tone? Yes The RF circuit can’t be driven. NO Replace the speaker Check the control circuit NO Speaker works well? Yes Yes 9.
TC-700 Disassembly and Assembly for Repair VCO Check NO Power supply is normal? Exchange Q306 Yes Oscillator CV voltage in Rx is normal? NO Yes Check if Q305 works well. Yes Check if Q304 output normally? NO Check Q304 NO Check Q301 NO Check power supply circuit. ` Yes Check if feedback is normal. Yes Check if 16.
TC-700 Disassembly and Assembly for Repair No output power Yes The current is normal? Yes Power supply works well? NO Control voltage is normal? NO Low Check power supply circuit Check Q502 High Check transistor offset voltage and low pass network Check drive stage Repair the transmissio n network Driver stage is normal? NO The power is normal? Check the suited network NO Yes Yes If the power is normal. Finished Finished NO Exchange Q102 Yes If the power is normal.
TC-700 Disassembly and Assembly for Repair No recieve Check if the power supply of AF IC is normal? NO Check if control voltage AFCO is normal. Yes Exchange 717 NO Exchange IC Yes Check if the output of base band IC is normal. NO Check if the input of base band IC is normal. Yes Exchange AK2346 NO Yes Check volume knob & AFMUTE Check the output of IC204 is normal. Yes Check IC404 NO Check the second local oscillator is normal. NO Check Q308 Yes Check the voltage of CD201 is normal.
TC-700 Disassembly and Assembly for Repair 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.
TC-700 Disassembly and Assembly for Repair 5. 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.
TC-700 Disassembly and Assembly for Repair Fig. 5 Fig.
TC-700 Exploded View Exploded View A 5 4 3 2 1 C B 6 8 7 9 6 1 10 11 42 43 42 A 41 31 12 A 32 13 A A 40 14 33 2 35 TX-RX Unit 39 38 37 15 36 B 26 25 34 27 28 29 16 C F 30 17 24 A 19 23 D E 18 E 22 21 44 20
TC-700U(2) Part List 2 TC-700 Part List 2 No. P/N Part Description Qty 1 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.
TC-700U(2) Part List 2 41 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 13.00 B 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.
TC-700 Packing Packing 47
Description of TC-700 Desktop Charger Description 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.
Description of TC-700 Desktop Charger 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.
Description of TC-700 Desktop Charger 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.
Description of TC-700 Desktop Charger 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.
Description of TC-700 Desktop Charger 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.
TC-700 Specifications Specifications General VHF: 136-174MHz Frequency Range 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 Dimensions and Weight -20℃ — +50℃ 119 mm×54mm×46mm、400 g Receiver Reference Sensitivity 0.25/0.
