Hytera TC-700 User 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:
zDO NOT transmit until all RF connectors are verified secure and any open connectors are
properly terminated.
zSHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive
atmosphere.
zWhen in vehicles with an airbag, do not place a portable radio in the area over an airbag or in the
airbag deployment area.
zDo not expose the radio to direct sunlight for a long time nor place it close to a heating source.
zDo not use any portable radio with a damaged antenna. If a damaged antenna comes into contact
with your skin, a minor burn may result.
zWhen transmitting with a portable radio, hold the radio in a vertical position with its microphone
about 5 centimeters away from your mouth.
zIf 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.
zThis equipment should be serviced by a qualified technician only.

TC-700 Brief Introduction
2
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.
(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
4
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. 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
5
selected 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
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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
8
First 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
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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
10
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. 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 MCUBlockDiagram
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
15
CPU 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 Serialdateoutput.
30 P66/RxD1 RXD I Serialdateinput.
31 P65 I
32 P64 O
33 P63/TxD0 I COM4 MANDOWN Input Pin
34 P62/RxD0 O COM3

TC-700 CPU Pins
16
35 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
18
TC-700 Part List 1

TC-700 Adjustment Description
19
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
DigitalVoltmeter 1set
3A Ammeter 1set
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±0.1V2.Transmit VCO
lock voltage 2. TX Low Check >0.5V
1. CH: RX high 3.9V±0.1V3.Receive VCO
lock voltage 2. RX low
Digital
Voltmeter
CV TC301
TC302
Check >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.