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
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| Document Description | Users Manual |
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| Date Submitted | 2007-07-09 00:00:00 |
| Date Available | 2007-07-09 00:00:00 |
| Creation Date | 2007-06-18 18:21:49 |
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| Document Title | Microsoft Word - TC-700 Service Manual-01.doc |
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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
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. 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:
DO NOT transmit until all RF connectors are verified secure and any open connectors are
properly terminated.
SHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive
atmosphere.
When in vehicles with an airbag, do not place a portable radio in the area over an airbag or in the
airbag deployment area.
Do not expose the radio to direct sunlight for a long time nor place it close to a heating source.
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.
When transmitting with a portable radio, hold the radio in a vertical position with its microphone
about 5 centimeters away from your mouth.
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.
This equipment should be serviced by a qualified technician only.
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.
(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
(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
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
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
TX Frequency
(MHZ)
(MHZ)
Signaling
Power
Channel
Spacing
RX1
TX1
None
25KHZ
RX3
TX3
None
25KHZ
RX5
TX5
None
25KHZ
RX1
RX1
None
LO
20KHZ
RX3
RX3
None
LO
20KHZ
RX5
RX5
None
LO
20KHZ
RX1
RX1
None
LO
12.5KHZ
RX3
RX3
None
LO
12.5KHZ
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
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
(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
First Group of Adjustment Items
Channel No.
Adjustment Item
Remarks
25KHz
20KHz
TX power LOW
5 point tuning
CDCSS PLL balance
3 point tuning (wideband)
CDCSS deviation
3 point tuning (wideband)
1 point tuning
3 point tuning (wideband)
1 point tuning
CTCSS deviation LOW (67Hz)
CTCSS deviation CENTER
12.5KHz
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(136.5Hz)
3 point tuning (wideband)
1 point tuning
CTCSS deviation HIGH (254.1Hz)
3 point tuning (wideband)
1 point tuning
AK2346 audio deviation (TX)
3 point tuning (wideband)
1 point tuning
2 TONE deviation
1 point tuning (wideband)
1 point tuning
DTMF deviation
1 point tuning (wideband)
1 point tuning
10
MSK deviation
3 point tuning (wideband)
1 point tuning
11
TX power HIGH
5 point tuning
12
TX voltage LOW
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
TC-700 Software Specification
Second Group of Adjustment Items
Channel No.
Adjustment Item
Remarks
25KHz
6.
20KHz
RX sensitivity
5 point tuning
AK2346 volume (RX)
1 point tuning (wideband)
1 point tuning
Squelch level 3 (OPEN)
5 point tuning (wideband)
1 point tuning
Squelch level 3 (SQUELCH)
5 point tuning (wideband)
1 point tuning
Squelch level 9 (OPEN)
5 point tuning (wideband)
1 point tuning
Squelch level 9 (SQUELCH)
5 point tuning (wideband)
1 point tuning
RX voltage LOW
1 point tuning
12.5KHz
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
1 point tuning
(narrowband)
PC Adjust Mode
Select test mode from programming items in programming software and then begin adjustment.
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. 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
10
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.
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.
11
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.
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
12
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. 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.
13
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.
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：
EEPROM
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.
14
TC-700 CPU Pins
CPU Pins
1.
CPU pins are as follows:
No.
MCU Port Name
Port Name
Input/Output
Features
P94/DA1
APC/TV
P93/DA0
TONEO
P92/TB2IN
NC
P91
P90
SHIFT
BYTE
BYTE
CNVSS
CNVSS
P87/XCIN
P86/XCOUT
10
RESET
RESET
Input low level to enter all reset mode
11
XOUT
XOUT
Crystal oscillator output pin
12
VSS
GND
GND
13
XIN
XIN
Crystal oscillator output pin
14
VCC
VCC
VCC
15
P85/NMI
NMI
16
P84/INT2
AFCK
2346 TCLK
17
P83/INT1
AUX1
Indication for external scrambler
18
P82/INT0
AFRDF
2346 RDF
19
P81
20
P80
PTTCO
21
P77
NC
22
P76/TA3O
CTCOUT
23
P75
NC
24
P74/TA2O
CTC_PLL
25
P73
AUX2
26
P72/TA1O
1/2OSC
TONEI
27
P71/RxD2/TB5IN
Automatic Power Control
DTMF/2-5Tone/Beep tone output/ ALARM
tone output
NC
Clock beat-frequency
COM5
PTTCO
CTC _OUT (PWM) TO VCO
CTC_PLL (PWM)
Indication for receive/transmit status
28
P70/TxD2
29
P67/TxD1
TXD
Serial date output.
30
P66/RxD1
RXD
Serial date input.
31
P65
32
P64
33
P63/TxD0
COM4 MANDOWN Input Pin
34
P62/RxD0
COM3
15
TC-700 CPU Pins
35
P61
COM1
36
P60
COM2
37
P57/RDY
EEDAT
I/O
EEPROM
38
P56/ALE
EECLK
EEPROM CLK
39
P55/HOLD
40
P54/HLDA
AFDIR
AK2346 DIR
41
P53/BLCK
AFSCK
2346 SCLK
42
P52/RD
NC
43
P51/BHE
AFDT
44
P50/WR
WE
45
P47/CS3
CODIO
I/O
Common date control (AK2346 DATA).
46
P46/CS2
47
P45/CS1
SAVE
SAVE, power save control
48
P44/CS0
R5C
R5C Rx circuit power supply control
49
P43/A19
T5C
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
VCC
61
P30/A8
NCON
Narrowband control
62
Vss
GND
GND
63
P27/A7
AFCO
AFCO
64
P26/A6
WCON
Wideband control
65
P25/A5
LEDR
Red light control：H，lit；L，out
66
P24/A4
LEDG
Green light control：H，lit；L，out
67
P23/A3
EN2
EN2
68
P22/A2
EN4
EN4
69
P21/A1
EN3
EN3
70
P20/A0
EN1
EN1
71
P17/INT5
72
P16/INT4
AFMUTE
16
DATA, date input/output.
2346 TDATA
TC-700 CPU Pins
73
P15/INT3
74
P14
TK
75
P13
DC-Switch
76
P12
PLL_UL
PLL unlock detect
77
P11
PLL_STB
PLL strobe output
78
P10
MICMUTE
MICMUTE
79
P07/D7
Option1
Programming cable detect.
80
P06/D6
PLL_DATA
PLL date input
81
P05/D5
PLL_CLK
PLL clock output
82
P04/D4
T/R
Receive/transmit control
83
P03/D3
APC-Switch
84
P02/D2
PTT
PTT
85
P01/D1
SK1
Side Key1
86
P00/D0
SK2
Side Key2
87
P107/AN7
MIC signal input
88
P106/AN6
BATT
BATT, battery voltage detect
89
P105/AN5
BATTSEL
Battery detect
90
P104/AN4
NC
91
P103/AN3
SELF
Top Key
Reset mode control：ground this pin to enter
reset mode.
92
P102/AN2
RSSI
RSSI detect pin
93
P101/AN1
SQL
Squelch level input
94
AVSS
GND
A/D conversion power supply input.
95
P100/AN0
CTCIN
CTCSS output
96
VREF
VCC
A/D conversion reference voltage
97
AVCC
VCC
A/D conversion power supply input.
98
P97
99
P96
100
P95
17
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.
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
Item
Condition
Test
Instrument
1. Setting
Power supply voltage
2.Transmit VCO
Terminal
CV
Adjustment
Parts
Method
TC301
3.9V±0.1V
TC302
Check
1. CH: TX high
Digital
lock voltage
2. TX Low
Voltmeter
3.Receive VCO
1. CH: RX high
3.9V±0.1V
lock voltage
2. RX low
Check
Specification
/Remarks
>0.5V
>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.
19
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.
(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}
20
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.
PTT key
Adjust power to:
Turn to CH1.
(increase)
1W±0.1W
TX Test
1. TX power Low
2. CDCSS balance
Group 1
Adjust at 5 point
SK1 key
(wideband).
(decrease)
Enter the adjust mode.
PTT key
Turn to CH3. Adjust at
(increase)
3 point (wideband), 1 point
SK1 key
No adjustment
(medium band) and
Radio
1 point (narrowband)
Communication
respectively.
Test Set
Enter the adjust mode.
TX TEST
PTT key
Adjust deviation to
Turn to CH3. Adjust at
HPF：20HZ
(increase)
750Hz (wideband),
3 point (wideband), 1 point
LPF：300HZ
SK1 key
600Hz (medium
(decrease)
band) and 400Hz
(decrease)
3. CDCSS
(medium band) and
deviation
1 point (narrowband)
(narrowband)
respectively.
respectively.
Enter the adjust mode.
PTT key
Turn to CH4. Adjust at
(increase)
4. CTCSS (67.0Hz)
3 point (wideband), 1 point
SK1 key
deviation Low
(medium band) and
(decrease)
1 point (narrowband)
respectively.
5. CTCSS
(136.5Hz) deviation
Center
Enter the adjust mode.
PTT key
Turn to CH5. Adjust at 3
(increase)
point (wideband), 1 point
SK1 key
(medium band) and
(decrease)
1 point (narrowband)
respectively.
21
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)
3.2KHz (medium
point (wideband), 1 point
HPF: 20Hz
SK1 key
band) and 2KHz
(medium band), 1 point
LPF: 15KHz
(decrease)
(narrowband)
(narrow band).
1KHz
respectively.
120mV
8. 2 Tone
Group 1
deviation
Radio
Adjust deviation to
Enter the adjust mode.
Communication
3.2KHz
Turn to CH8. Adjust at 1
Test Set
PTT key (increase)
(wideband),
point (wideband), 1 point
TX Test
SK1 key
2.5KHz (medium
(medium band), 1 point
HPF: 20Hz
(decrease)
band) and 1.8KHz
(narrow band).
LPF: 15KHz
(narrowband)
No modulation
respectively.
signal.
Adjust deviation to
Enter the adjust mode.
9. DTMF
deviation
PTT key (increase)
Turn to CH9. Adjust at 1
SK1 key
point (wideband), 1 point
(decrease)
(medium band), and 1
point (narrow band).
3.2KHz
(wideband),
2.5KHz (medium
band) and 1.8KHz
(narrowband)
respectively.
Adjust deviation to
Enter the adjust mode.
10. MSK
deviation
3.2KHz
Turn to CH10. Adjust at 3
PTT key (increase)
(wideband),
point (wideband), 1 point
SK1 key
2.5KHz (medium
(medium band), 1 point
(decrease)
band) and 1.8KHz
(narrow band).
(narrowband)
respectively.
22
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).
5.8V,press PTT to
save
23
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 2.5V,
dual input 5V
Enter the adjust mode. Turn to
3. Squelch
CH3. Adjust at 5 point
Level 3
(wideband), 1 point (medium
(OPEN)
band) and 1 point
4. Squelch
Group 2
Level 3
(SQUELCH)
Adjust level to
Save
-123dBm，press
PTT to save
(narrowband) respectively.
Radio
Enter the adjust mode. Turn to
Communication
CH4. Adjust at 5 point
Test Set
(wideband), 1 point (medium
RX TEST
band) and 1 point
HPF：300HZ
(narrowband) respectively.
LPF：3KHZ
Adjust level to
Save
-125dBm，press
PTT to save
Enter the adjust mode. Turn to
5. Squelch
CH5. Adjust at 5 point
Adjust level to
Level 9
(wideband), 1 point (medium
(OPEN)
band) and 1 point
Save
-117dBm，press
PTT to save
(narrowband) respectively.
Enter the adjust mode. Turn to
6. Squelch
CH6. Adjust at 5 point
Adjust level to
Level 9
(wideband), 1 point (medium
(SQUELCH)
band) and 1 point
Save
-119dBm，press
PTT to save
(narrowband) respectively.
Enter the adjust mode. Turn to
7. RX voltage
CH7. Adjust at 1 point
Low
(wideband).
Adjust power
Save
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)
24
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
9.8304MHz works
normally?
Read
available?
NO
Check the
circuit of read
frequency
Yes
Q501
works well?
Yes
NO
Exchange
Q501
Yes
Pin10 is of
high level?
NO
Check M5V
Yes
MCU works well
25
Reset
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 16.8MHz
oscillates?
Yes
Check CPU data
circuit
26
NO
Exchange
Q305
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.
NO
Finished
Exchange
Q101
27
Yes
VCO
Check flow
chart
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.
NO
Exchange
CD201
NO
Check the
status of IC204
Yes
Check if PIN 16
outputs in IF input
Yes
Check if T1 outputs in
RF input
Yes
Check Q207
passage
28
NO
Check VCO
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. 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.
29
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. 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.
30
TC-700 Disassembly and Assembly for Repair
Fig. 5
Fig. 6
31
TC-700 Exploded View
Exploded View
10
11
42
43
42
41
31
12
32
13
40
14
33
35
TX-RX Unit
39
38
37
15
36
26
25
34
27
28
29
16
30
17
24
19
23
18
22
21
44
20
TC-700U(2) Part List 2
TC-700 Part List 2
No.
P/N
Part Description
Qty
6000135000000
TC-700S PTT key cover Black
1.00
6100068000000
TC-700S PTT silica rubber key Black
1.00
8600700500000
TC-700 Model label
1.00
8600700500100
HYT-LOGO Logo
1.00
6000076000020
TC700 Knob (encoder)
1.00
6201006000000
TC2088 Inner liner knob
2.00
6000136000000
TC-700S Light guide
1.00
750700S000000 TC700S Light guide 3M (9448) adhesive paper
1.00
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
46
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
7101904020020
Self-tapping ST1.9*4.0mm
13.00
7102504000300
Machine screw M2.5*4.0mm Ultra-thin cross-head
2.00
7102004520000
Self-tapping ST2.0*4.5mm pan head
2.00
7103006001000
Machine screw M3.0*6.0mm pan head
2.00
7102508000000
Machine screw M2.5*8.0mm Hex wobbler
2.00
7102004020050
Self-tapping ST2.0*4.0mm cross recessed pan head
1.00
46
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.
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
56
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. 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.
57
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. 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.
58
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.
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
59
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.
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.
60
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
0.25/0.35 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
-36dBm<1GHz
Spurious and Harmonics
-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.
64
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