HYT TC-700 Ex PLUS User manual

INTRINSICALLY SAFE
813700EX00100
2007-01-20

TC-700 Ex PLUS Service Manual
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Contents
General---------------------------------------------------------------------------------------------------------2
ATEX-Approved Intrinsically Safe Radio Information-----------------------------------------------3
Radio Overview-----------------------------------------------------------------------------------------------4
Software Specifications-------------------------------------------------------------------------------------6
Circuit Description------------------------------------------------------------------------------------------10
CPU Pins-----------------------------------------------------------------------------------------------------15
Parts List 1----------------------------------------------------------------------------------------------------18
Adjustment Description------------------------------------------------------------------------------------48
Troubleshooting---------------------------------------------------------------------------------------------53
Disassembly and Assembly------------------------------------------------------------------------------57
Exploded View-----------------------------------------------------------------------------------------------59
Parts List 2----------------------------------------------------------------------------------------------------60
Packing--------------------------------------------------------------------------------------------------------62
Exploded View (ATEX-approved Battery)-------------------------------------------------------------63
Parts List (ATEX-approved Battery)--------------------------------------------------------------------63
TC-700 Ex PLUS VHF PC Board View Top Layer--------------------------------------------------64
TC-700 Ex PLUS VHF PC Board View Bottom Layer---------------------------------------------65
TC-700 Ex PLUS UHF PC Board View Top Layer--------------------------------------------------66
TC-700 Ex PLUS UHF PC Board View Bottom Layer---------------------------------------------67
TC-700 Ex PLUS Level Diagram------------------------------------------------------------------------68
TC-700 Ex PLUS Block Diagram-----------------------------------------------------------------------69
TC-700 Ex PLUS VHF Schematic Diagram(RF) ---------------------------------------------------70
TC-700 Ex PLUS VHF Schematic Diagram (Baseband & AF Amplifier)----------------------71
TC-700 Ex PLUS UHF Schematic Diagram(RF) ---------------------------------------------------72
TC-700 Ex PLUS UHF Schematic Diagram (Baseband & AF Amplifier)----------------------73
Specifications------------------------------------------------------------------------------------------------74

TC-700 Ex PLUS Service Manual
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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.
HYT endeavors to achieve the accuracy and completeness of this manual, but no warranty of accuracy
or reliability is given. All the specifications and design are subject to change without prior notice due to
continuous technology development. Changes which may occur after publication are highlighted by
Revision History contained in Service Manual.
No part of this manual may be copied, reproduced, translated, stored in a retrieval system, distributed, or
transmitted in any form or by any means, electronic or mechanical, for any purpose without the express
written permission of HYT.
Safety and General Information
Any person using the radio must observe the standard safety regulations and read the certificate to
prevent incorrect operation or abuse of the radio.
The following additional safety regulations must also be observed:
Unauthorized modification of the radio may result in termination of Ex-protection.
Unauthorized service or repairs are inhibited.
Do not disassemble the ATEX-approved intrinsically safe products.
The radio must not be opened in a hazardous area.
The battery must only be changed in a non hazardous area.
Additional or spare batteries must not be carried into a hazardous area.
Use only the Ex-battery BL1703-Ex specified by HYT. The use of other batteries is strictly
prohibited and will result in termination of Ex-protection.
The battery must only be charged in a non hazardous area with the designated charger
CH10L11-Ex.
Use only HYT approved accessories.
Ensure that the radio is not taken into Zone 0 areas.
To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any
facility where posted notices instruct you to do so. Hospital or health facilities may be using
equipment that is sensitive to external RF energy.
When instructed to do so, turn off your radio when on board an aircraft. Any use of a radio must
be in accordance with airline regulations or crew instructions.
To avoid possible interference with blasting operations, turn off your radio when you are near
electrical blasting caps, in a blasting area, or in areas posted: “Turn off two-way radio.”Obey all
signs and instructions.
For vehicles with an air bag, do not place a radio in the area over an air bag or in the air bag
deployment area.
Do not use any portable radio that has a damaged antenna. If a damaged antenna comes into
contact with your skin, a minor burn can result.
Do not expose the radio to direct sunlight over a long time, nor place it close to heating source.

TC-700 Ex PLUS Service Manual
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WARNING: Failure to use an ATEX-approved Product unit with an ATEX-approved
battery or ATEX-approved accessories specifically approved for that product may result in
the dangerously unsafe condition of an unapproved radio combination being used in a
hazardous location.
ATEX-Approved Intrinsically Safe Radio Information
ATEX-Approved Intrinsically Safe Radio
Certification
ATEX-approved Intrinsically Safe
ZELM 06 ATEX 0321
ATEX (Atmospheres Explosibles) Directive 94/9/EC
Introduced in 2003, this is the European Union directive to which all two-way radios must conform if used
in potentially explosive environments. It replaces the Cenelec classification in all European Union
member states and EFTA countries. All HYT professional series ATEX portable radios are approved to
ATEX Protection Classes II 2 G EEx ib IIB T3 and II 2D IP64 T160°C as interpreted in the following
tables:
ATEX Gas Protection:
ATEX Dust Protection:

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Radio Overview
1. PTT (Push-to-Talk) Key
Press and hold down the PTT key to transmit, release it to receive.
2. SK1 (Side Key 1) (programmable)
3. SK2 (Side Key 2) (programmable)
4. Antenna
5. Microphone
6. Speaker
7. TK (Top Key) (programmable)
8. Channel Selector Knob
Rotate the knob to select from channel 1 to 16.
9. Radio On-Off/Volume Control Knob
Rotate the knob clockwise to turn the radio on, rotate the knob fully counter-clockwise until a “click”
is heard to turn the radio off.
Turn the knob clockwise to increase the volume, or counter-clockwise to decrease the volume.
10. LED Indicator Table below explains the functions of the LEDs and beeps.
11. Accessory Jack
12. Battery Latch
13. Belt Clip
14. Accessory cover
15. Battery
16. Screw
17. Electrode Piece

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Wired Cloning Source radio: Turn the source radio on while
holding down the PTT and SK2.
Slave radio: Rotate the On-Off/Volume Control
knob clockwise to turn the slave radio on.
The orange LED flashes twice.
Source radio (power on the slave radio and
connect the cloning cable, then press the PTT
of source radio to initiate cloning.)
1) LED solidly glows red when
cloning progress;
2) LED goes out when cloning is
finished;
3) LED flashes red when cloning
fails.
Slave radio 1) LED solidly glows green when
cloning progress;
2) LED goes out when cloning is
finished.
Wireless
cloning
Turn on both the source radio and slave radio
while holding down the PTT and SK1. Both
radios are required to be on the same channel
for cloning.
The orange LED flashes once.
Source radio (turn on both the source radio and
slave radio while holding down the PTT and
SK1, then press the PTT of source radio while
both radios are on the same channel to initiate
cloning.)
LED solidly glows red when
cloning progress.
Slave radio 1) LED solidly glows green when
cloning progress;
2) LED flashes green and radio
sounds beep tone, when
cloning is finished;
3) LED flashes red when cloning
fails.
Power On The green LED flashes once.
Low Battery Alert LED flashes red, and radio sounds
three beeps every 30 seconds.
Transmitting LED glows red
Receiving LED glows green when carrier
presents.
Scanning Green LED flashes once every 1
second.
Programming Reading: LED glows red;
Writing: LED glows green.
Encoding (DTMF/PTT ID/2-Tone
(5-Tone)/HDC1200/HDC2400TM)
1) LED glows red while
transmitting;
2) LED glows orange when
transmission ends.

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Decoding (2-Tone (5-Tone)/HDC1200/HDC2400TM) Orange LED flashes after the
signalling is successfully decoded.
Select Power Level 0.5W: One beep is heard;
1.5W: Two beeps are heard;
3W: Three beeps are heard.
Function Key Press One beep to enable, two beeps to
disable.
Software Specifications
Specifications
Conventional Mode
1. Mechanical Selector Knob (16 channels)
VHF: 136-174 MHz
UHF: 420-470 MHz
2. Channel Spacing: 25/20/12.5KHz (programmable)
3. Step: 2.5/5/6.25KHz
4. LED Indicator: Red/Green/Orange
5. 3 Programmable Function Keys
6. CTCSS/CDCSS Encode & Decode
7. DTMF Encode
8. 2-Tone (5-Tone) Encode & Decode
9. HDC2400TM Encode & Decode
10. HDC1200 Encode & Decode
11. Squelch Mode:
1) Carrier
2) CTCSS/CDCSS
3) Optional Signalling
4) CTCSS/CDCSS AND 2-Tone (5-Tone)/ HDC2400TM/HDC1200
5) CTCSS/CDCSS OR 2-Tone / HDC2400TM/HDC1200
12. Scan
13. Time-Out-Timer (TOT)
14. Rental
15. Battery Save
16. Emergency
17. PTT ID
18. Busy Channel Lockout (Tx Admit Criteria)
Description
1. User Mode
This mode is for normal operation.
2. All Reset Mode
Firstly ground the SELF point, and then turn the radio 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 selected
channel and press PTT, the radio data is all reset (All clone modes will be automatically activated when

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All Reset is completed). Frequency settings are shown as follows:
Selected Channel Frequency Band(MHz) F1 (MHz) F2 (MHz) F3 (MHz) F4 (MHz) F5 (MHz)
1 136 - 174 (V) TX1:136
RX1:136.1
TX2:145.5
RX2:145.6
TX3:155
RX3:155.1
TX4:164.5
RX4:164.6
TX5:174
RX5:173.9
2 400 - 450 (U1) TX1:400
RX1:400.1
TX2:412.5
RX2:412.6
TX3:425
RX3:425.1
TX4: 437.5
RX4:437.6
TX5:450
RX5:449.9
3 440 - 490 (U2) TX1:440
RX1:440.1
TX2:452.5
RX2:452.6
TX3:465
RX3:465.1
TX4:477.5
RX4:477.6
TX5:490
RX5:489.9
4 420 - 470 (U3) TX1:420
RX1:420.1
TX2:432.5
RX2:432.6
TX3:445
RX3:445.1
TX4:457.5
RX4:457.6
TX5:470
RX5:469.9
5 470 - 520 (U4) TX1:470
RX1:470.1
TX2:482.5
RX2:482.6
TX3:495
RX3:495.1
TX4:507.5
RX4:507.6
TX5:520
RX5:519.9
6 300 - 350 (U6) TX1:300
RX1:300.1
TX2:312.5
RX2:312.6
TX3:325
RX3:325.1
TX4:337.5
RX4:337.6
TX5:350
RX5:349.9
7 350 - 390 (U5) TX1:350
RX1:350.1
TX2:360
RX2:360.1
TX3:370
RX3:370.1
TX4:380
RX4:380.1
TX5:390
RX5:389.9
8 450 - 520 (U8) TX1:450
RX1:450.1
TX2:467.5
RX2:467.6
TX3:485
RX3:485.1
TX4:502.5
RX4:502.6
TX5:520
RX5:519.9
9 400 - 470 (U7) TX1:400
RX1:400.1
TX2:417.5
RX2:417.6
TX3:435
RX3:435.1
TX4:452.5
RX4:452.6
TX5:470
RX5:469.9
Channel data is shown as follows:
Channel Rx Frequency (MHZ) Tx Frequency (MHZ) Signalling 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

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3. Wireless Cloning Mode
Select wireless cloning from optional functions in programming software, turn the radio on while holding
down PTT and SK1 key simultaneously for 2 seconds, then the source and slave radios enter wireless
cloning mode with orange LED flashing once (when both radios are turned on and stay in the same
channel), hold down PTT on the source radio to begin cloning. During cloning progress, the source radio
emits red LED and the slave radio emits green LED. When cloning is finished, the slave radio flashes
green LED and emits Beep tone, and the source radio shuts off LED. If cloning failed, the slave radio
flashes red.
4. Wired Cloning Mode
Select Wired Cloning from optional functions in programming software, turn the radio on while holding
down PTT and SK2 key simultaneously for 2 seconds, then the source radio enters Wired Cloning mode
with orange LED flashing twice. Then simply turn the slave radio on. Hold down PTT on the source radio
to begin cloning. During cloning progress, the source radio emits red LED and the slave radio emits
green LED. When cloning is finished, both radios shut off LED. If cloning failed, the source radio flashes
red.
5. Manual Adjust Mode
Manual adjustment is performed to adjust frequency deviation, power, sensitivity, squelch, etc.
Note: Prior to entering this mode, select the Manual Adjust Mode from optional functions in
programming software.
The manual adjustment operations are detailed as follows:
(1) Enter the manual adjust mode
Turn the radio 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
Adjust the settings on the selected channel. Each changing of channel selects 25KHz channel
spacing and low frequency F1.
(3) SK2 key
Sets the frequency. 1 point tuning adjusts center frequency; 3 point tuning adjusts F1, F3, F5; 5
point tuning adjusts F1-F5.
The frequency toggles at a low to high cycle. Green LED flashes once when adjusting F1.
(4) TK key
Use to toggle the channel spacing among 25 KHz, 20 KHz and 12.5 KHz. Red LED flashes once
when the 25 KHz is selected.
(5) PTT/SK1
PTT→Increase
SK1→Decrease
PTT/SK1 is pressed to increase or decrease the value of the adjusting item. Red LED glows
indicating the maximum value and green LED indicating the minimum value. Hold down the key to
increase or decrease the value continuously.
Press PTT key to save the BATT LOW, VOX and SQL settings, then green LED glows once.
(6) Select adjustment group
The first group of adjustment items is selected once the radio enters the manual adjust mode.
Select the 16th channel 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 is selected and flashes twice when the
second group is selected.

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(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}
6. PC Tuning Mode
Select tuning mode of programming items in the programming software and then tuning as the setting.
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 (wide)
3 CDCSS deviation 3 point tuning (wide) 1 point tuning 1 point tuning (narrow)
4 CTCSS deviation LOW (67Hz) 3 point tuning (wide) 1 point tuning 1 point tuning (narrow)
5CTCSS deviation CENTER
(136.5Hz) 3 point tuning (wide) 1 point tuning 1 point tuning (narrow)
6 CTCSS deviation HIGH (254.1Hz) 3 point tuning (wide) 1 point tuning 1 point tuning (narrow)
7 AK2346 audio deviation (TX) 3 point tuning (wide) 1 point tuning 3 point tuning (narrow)
8 2 TONE deviation 1 point tuning (wide) 1 point tuning 1 point tuning (narrow)
9 DTMF deviation 1 point tuning (wide) 1 point tuning 1 point tuning (narrow)
10 MSK deviation 3 point tuning (wide) 1 point tuning 1 point tuning (narrow)
11 TX power HIGH 5 point tuning
12 TX voltage LOW 1 point tuning
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 (wide) 1 point tuning 1 point tuning (narrow)
3 Squelch level 3 (OPEN) 5 point tuning (wide) 1 point tuning 3 point tuning (narrow)
4 Squelch level 3 (SQUELCH) 5 point tuning (wide) 1 point tuning 3 point tuning (narrow)
5 Squelch level 9 (OPEN) 5 point tuning (wide) 1 point tuning 3 point tuning (narrow)
6 Squelch level 9 (SQUELCH) 5 point tuning (wide) 1 point tuning 3 point tuning (narrow)
7 RX voltage LOW 1 point tuning

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Circuit Description
Power Supply
The radio power is supplied by the battery. The power supply is from B+, and supplies power SWB+ for
the three AVRs, after passing through fuse FE250mA and switch. 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. While transmitting, T5C becomes low level and Q502 is turned on to supply
5V (T5V) voltage for the transmit circuit. While receiving, R5C becomes low level and Q504 is turned on
to supply 5V (R5V) voltage for the receive circuit. Power supply for RF is from B+ and works after
passing through fuse FE4 2A. Power supply for audio PA is from B+ and works after passing through
fuse FE5 0.5A.
Fig. 1 Power Supply Block Diagram
PLL Frequency Synthesizer
PLL circuit generates the first local oscillator signal for receive and RF signal for transmit.
Fig.2 PLL Block Diagram

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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 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 occurs at MUXOUT pin of IC301. Transmission is inhibited if this
condition is detected by microprocessor.
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.
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

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450KHz ceramic filter (wide: CF201，narrow: CF202) to eliminate unwanted signals before it is amplified
and detected in IC204.
4. Narrow/Wide Switch Circuit
Pin WCON and pin NCON of IC500 outputs wide (high level) and narrow (low level) channel spacing
signal respectively to turn on corresponding diode-connector, and to choose ceramic filter CF201 (wide)
or CF202 (narrow) to filter useless spurious signal.
5. AF Amplifier
The resulting AF signal from IC204 enters baseband processing chip IC408. The processed AF signal is
then amplified by an AF power amplifier (IC401) to drive the speaker.
Transmitter
1. AF and Signalling
AF signal from the microphone is amplified and low-pass-filtered in IC402 before it enters baseband
processing chip IC408, which also enters CTCSS/CDCSS/DTMF/2-Tone (5-Tone) signalling 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
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.

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13
4. APC
The automatic power control (APC) circuit stabilizes the transmit 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 in proportion to the difference between auto detect voltage and
reference voltage output from IC101 (1/2). The output voltage controls FET power.
Baseband and Signalling System
The block diagram of signalling section is shown as figure 5.
AF DET
IC404
AMP LPF
IC405
LPF
CTCSS/CDCSS
TI
RXIN/RXINO
IC401
AMP
SP
AFCO
AFMUTE
MIC
Q401
SW
IC402
AMP LPF
D402
RB706F-40
VOX
MIC MUTE
5CNS
PTT
TONEO
Q406
Q407
SW
Q403
SW
Q404
SW
ALM/BP
IC408
AK2346
VR1
Scrambler
DeScrambler
VR3RXLPF
Pre-
Emphasis
COM-
pressor
SMF VR4ExpandSplatterVR2
Limiter De-
Emphasis
MSK
Modulator
MSK
Demodulator
MOD
IC407
BPF
TONEI
AFCK
CODIO
AFRDF
AFDT
AFSK
AFDIR
1/2OSD
TONEO
Fig. 5 AF and Signalling Circuit
1. CTCSS/CDCSS
Transmit: CTCSS/CDCSS signalling produced by CTCSS-PLL pass a low pass filter and then enters
VCXO. CTCSS/CDCSS signalling produced by CTCSS-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
CTCSS/CDCSS 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 output tone, and is then applied to the
baseband processing IC. The signal in mixed with the audio signal and goes to the VCO.
Receive: Demodulated signal is filtered after passing baseband processing IC, and then enters MCU for
decoding.
3. MSK
Transmit: MSK signal produced by baseband 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 baseband processed IC for amplification, pre-emphasis etc. after
being amplified. And then it enters VCO for modulation.
Receive: Demodulated AF signal enters the baseband processing IC for amplification, de-emphasis,

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14
etc., after being amplified. And then it enters AF PA driven speaker.
Baseband processed chip provides functions for processing signal as amplifying, filtering, emphasizing,
scrambling, companding, and amplitude limiting.
Control System
The IC500 CPU operates at 9.8304 MHz.
The block diagram of MCU control system is shown as the following figure:
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
signalling decode signal and squelch level signal; output control signal to control the light/off of LED;
control signalling process IC to perform tasks.
EEPROM
CTCSS/CDCSS
Code

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15
CPU Pins
No. MCU Port Port Name Input/Output Features
1 P94/DA1 APC/TV O Automatic Power Control
2 P93/DA0 TONEO O DTMF/2-Tone (5-Tone)/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 COM5 O 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
34 P62/RxD0 O COM3
35 P61 COM1

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No. MCU Port Port Name Input/Output Features
36 P60 COM2
37 P57/RDY EEDAT I/O EEPROM DATA, date input/output.
38 P56/ALE EECLK O EEPROM CLK
39 P55/HOLD I
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 Narrow control
62 Vss GND I GND
63 P27/A7 AFCO O AFCO
64 P26/A6 WCON O Wide control
65 P25/A5 LEDR O Red LED control: H, lit; L, goes out
66 P24/A4 LEDG O Green LED control: H, lit; L, goes 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 Ex PLUS Service Manual
17
No. MCU Port Port Name Input/Output Features
73 P15/INT3
74 P14 TK I ALARM
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 MONI
86 P00/D0 SK2 I FK
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 input
96 VREF VCC I A/D conversion reference voltage
97 AVCC VCC I A/D conversion po
wer supply input.
98 P97 O
99 P96 O
100 P95 O

TC-700 Ex PLUS Service Manual
18
Parts List 1
TC-700 Ex PLUS VHF Parts List 1
No. Material No. Description Qty. Ref No. Print No.
1 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R147 T5F
2 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R254 T1G
3 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R303 B3G
4 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R315 B4I
5 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R318 B4I
6 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R319 B4I
7 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R402 T1F
8 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R404 B3K
9 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R406 B2J
10 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R424 R444
11 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R444 B2I
12 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R453 B3K
13 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R457 B3K
14 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R495 B3J
15 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R497 T1H
16 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R504 T5I
17 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R510 T3K
18 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R519 T1I
19 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R590 B3K
20 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R608 T1G
21 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R609 T1G
22 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R152 B3G
23 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R214 B2G
24 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R344 B2I
25 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R348 B4J
26 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R349 B5I
27 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R350 B5I
28 3001051000000 Chip resistor 0402 10ΩJ 1/16 1 R456 T2E
29 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R222 B1G
30 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R223 B1E
31 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R301 B3I
32 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R305 B4G
33 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R308 B4G
34 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R335 B3I
35 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R346 B2I
36 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R454 T1D
37 3001051010000 Chip resistor 0402 100ΩJ 1/1 1 R605 T2A
38 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R228 B1E
39 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R311 B4G
40 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R317 B4I
41 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R352 B5I
42 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R405 B3K
43 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R466 T1J
44 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R468 T1C
45 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R512 T4I
46 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R522 T2H
47 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R534 T3I
48 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R550 T2J

TC-700 Ex PLUS Service Manual
19
No. Material No. Description Qty. Ref No. Print No.
49 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R551 T4J
50 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R553 T2I
51 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R555 T4J
52 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R560 T2I
53 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R563 T4I
54 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R565 T3K
55 3001051020010 Chip resistor 0402 1KΩJ 1/16 1 R566 T3K
56 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R112 B4E
57 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R141 T4E
58 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R201 B2F
59 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R321 B4J
60 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R336 B5J
61 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R347 B4I
62 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R407 B3K
63 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R418 T3F
64 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R426 B3K
65 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R432 T1J
66 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R440 T1E
67 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R442 B3K
68 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R461 T1K
69 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R463 T1J
70 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R467 T1J
71 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R471 B2K
72 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R476 B2K
73 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R480 B3K
74 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R482 B3J
75 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R485 B3J
76 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R487 B4J
77 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R489 B4J
78 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R508 T2J
79 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R517 T4K
80 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R630 T2G
81 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R631 T3G
82 3001051030000 Chip resistor 0402 10KΩJ 1/1 1 R632 T3G
83 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R146 T4F
84 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R212 B2G
85 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R218 T1H
86 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R234 B3D
87 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R235 B3C
88 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R240 B3B
89 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R241 B3D
90 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R242 B3B
91 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R253 B3C
92 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R310 B4G
93 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R400 T1G
94 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R403 T1F
95 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R428 B2J
96 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R429 T1J
97 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R430 T1J
98 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R448 B4K
99 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R475 B2K
100 3001051040010 Chip resistor 0402 100KΩJ 1/ 1 R486 T1H