Hytera TC-600 User manual

－1 －
Contents
General………………………………………………………………………………2
Brief Introduction………………………………………………………………….3
Software Specification……………………………………………………………5
Circuit Description……………………………………………………………….11
CPU Pins…………………………………………………………………………...16
Part List 1………………………………………………………………………….18
Adjustment Description…………………………………………………………30
Disassembly and Assembly for Repair……………………………………….33
Exploded View…………………………………………………………………….36
Part List 2…………………………………………………………………………37
Packing…………………………………………………………………………….39
PC Board View……………………………………………………………………40
Block Diagram…………………………………………………………………….42
Schematic Diagram………………………………………………………………43
Specifications…………………………………………………………………….44

TC-600 General
－2 －
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 qualified technicians only.

TC-600 Brief Introduction
－3 －
Brief Introduction
1. Antenna
Used to transmit/receive signals.
2. LED Indicator
The light will glow red during transmission and glow green during receiving. During transmission,
the light flashes red when the battery voltage is low.
3. Channel Selector Knob
4. Power/Volume Control Knob
Rotate the Power/Volume Knob clockwise until a ―click‖is heard to turn the radio on, fully counter
clockwise until a ―click‖is heard to turn the radio off. When the radio is on, turn the knob to adjust
volume.
5. PTT Key
Press and hold PTT key to talk, release to receive.
6. Function Key
The key can be programmed to access the radio features with the preset type of key pressing
through the programming software.
7. Microphone
Used to input sounds.
8. Speaker
Used to output sounds.

TC-600 Brief Introduction
－4 －
9. External Jack (for external earphone or radio programming)
Rotate the jack cover and insert accessory plug, or insert programming cable into the jack to
program the radio via programming software.
10. Battery
11. Belt Clip
Used to clip radio on your belt.
12. Battery Latch
Used to fasten and remove the battery.
13. Charging Connector
Insert the battery into the charger; connect the charging connectors with those on the charger to
begin charging.

TC-600 Software Specification
－5 －
Software Specification
Radio Feature Description
1. Use Channel Selector Knob to choose from 15+1(Scan) channels
2. Monitor
3. CTCSS/CDCSS Encode & Decode
CTCSS: 38 groups
CDCSS: 83 groups
4. Wideband (25KHz) / Narrowband (12.5KHz)
5. Channel Scan (Priority channel and Revert channel available)
6. Battery Save feature (Dealer programmable)
7. Time-out Timer (TOT)
8. Squelch Level (1-9)
9. Low BatteryAlert
10. Programmable Function Key
11. High/Low Power
12. 2-Tone Encode & Decode
13. DTMF ANI
14. Model Set Mode
15. PC Programming & Adjust Mode
16. Manual Adjust Mode
17. User Wired Clone Mode
18. Factory Wired Clone Mode

TC-600 Software Specification
－6 －
Radio Modes
Mode
Entry for Mode Startup
Audible & Visual Indicator
User Mode
Disconnect the SELF points and then turn the
power on
Power-on alert tone (one long Beep)
Model Set Mode
Short out the SELF points and then turn the power
on
2 short Beeps, the light flashes from red
to green
User Wired Clone Mode
Disconnect the SELF points, turn on the power
while holding down Function Key, press Function
Key again
1 short Beep
Factory Wired Clone
Mode
Short out the SELF points, turn on the power while
holding down Function Key, press Function Key
again
2 short Beeps
Manual Adjust Mode
Enable Manual Adjust Mode, turn on the power
while holding down [PTT] and Function Key
simultaneously, the radio enters this mode in 2
seconds
2 short Beeps, orange light glows
PC Programming &
Adjust Mode
Connect the radio with PC, turn on the radio and
activate this mode in programming software
1. User Mode
User Mode is for conventional communication operation. Disconnect the two SELF points and then turn
the power on, the radio enters User Mode. (Refer to ―TC-600 Owner’s Manual‖for detailed operation
description.)
2. Model Set Mode
(1) Select MS1 according to the radio model. If MS1 is 1, short out the two MS1 points on PCB. If not,
disconnect the two MS1 points.
(2) Short out the two SELF points and then turn the power on. Two Beeps sound.
(3) Turn Channel Selector Knob to the corresponding position (1-11) according to the radio model
(Refer to ―Initial Data Table‖).
(4) Press [PTT] while holding down Function Key to set the model. Channel data and settings are
initialized (Refer to ―Initial Data Table‖).

TC-600 Software Specification
－7 －
(5) Turn off the power and then disconnect the two SELF points to complete the model setting.
For example, MS1 of TC-600U (450.000~469.995MHz) is 0 and its model is 7(Refer to ―Initial
Data Table‖). To initialize its model and channel data, you can operate as following:
●Disconnect the two MS1 points.
●Short out the two SELF points.
●Turn on the power and rotate the Channel Selector Knob to CH7.
●Press [PTT] while holding down Function Key.
●After reset, turn off the power and disconnect the two SELF points. The radio operates at the
preset frequency after restart.
Note: Once the new model is set, previous channel settings (frequency, CTCSS/CDCSS, channel
function settings) will be deleted, and part of functions are also changed. Therefore, do not make this
operation unless it’s very necessary, such as changing the EEPROM, etc.
3. PC Programming Mode
The following parameters can be set through programming software:
(1) Receive frequency and transmit frequency
(2) Receive signaling and transmit signaling
(3) Busy channel lockout (BCL)
(4) Time-out timer (TOT)
(5) Squelch level
(6) Battery save
(7) Audio alarm
(8) Monitor mode
(9) Scan mode
(10) Scan revert channel
(11) Priority scan channel
(12) Wideband/narrowband per radio
(13) High/low power
(14) Wideband/narrowband per channel

TC-600 Software Specification
－8 －
4. PC Adjust Mode
The following settings can be adjusted through the programming software:
(1) Low battery alert level
(2) SQL9
(3) SQL3
(4) CTCSS deviation (wide)
(5) CDCSS deviation (wide)
(6) CTCSS deviation (narrow)
(7) CDCSS deviation (narrow)
5. Manual Adjust Mode
If Manual Adjust Mode is enabled, turn on the power while holding down [PTT] and Function Key
simultaneously, the radio enters Manual Adjust Mode in 2 seconds. Choose the adjusting items by
turning the channel selector knob to CH1-CH7; use [PTT] /Function Key to adjust upwards/downwards
(Note: MIC jack shouldn’t be connected with external cable while adjusting), CH1-CH7 are defined as
follows:
(1) Low battery alert level
(2) SQL9
(3) SQL3
(4) CTCSS deviation (wide)
(5) CDCSS deviation (wide)
(6) CTCSS deviation (narrow)
(7) CDCSS deviation (narrow)

TC-600 Software Specification
－9 －
CH12-CH16 are used to adjust transmitter and receiver. Press [PTT] to transmit; release to receive. In
receive mode, short press the Function Key to toggle among high and low power, or long press it to
switch between wideband and narrowband. Three Beeps alternating from high tone to low tone indicate
that the transmit power is switched from high to low; and three beeps alternating from low tone to high
tone indicate that the transmit power is switched from low to high. Two Beeps sound when wideband is
selected and one Beep sounds when narrowband is selected. CH12-ch16 are defined as follows:
(12) Center frequency (the difference between RX and TX frequency is 0.1MHz)
(13) Lowest frequency (the difference between RX and TX frequency is 0.1MHz)
(14) Highest frequency (the difference between RX and TX frequency is –0.075MHz)
(15) Center frequency: transmit DTMF number ―9‖(the difference between RX and TX frequency is
0.1MHz)
(16) Center frequency: transmit with 250.3Hz CTCSS signaling (the difference between RX and TX
frequency is 0.1MHz)
Note:
To enable/disable the Manual Adjust Mode: short out the two SELF points, turn on the power to enter
Model Set Mode, then Manual Adjust Mode is enabled. Press [PTT] to disable. It suggests this mode be
disabled after the adjustment is completed.
6. User/Factory Wired Clone Mode
The only difference between the two modes is that the latter is able to clone the adjustment settings.
Turn on the power while holding down Function key to enter Wired Clone Mode.
a) If the two SELF points are disconnected, press Function key again, the radio starts user wired clone
and red LED flashes; when cloning is completed, red LED goes out.
b) If the two SELF points are short out, press Function key again, the radio starts factory wired clone
and red LED flashes; when cloning is completed, red LED goes out.

TC-600 Software Specification
－10 －
Initial Data Table
MS1
Model
Frequency
(MHz)
IF
(MHz)
1CH (Center)
2CH (Low)
3CH (High)
4CH
5CH
6CH
7CH
8CH
9-16CH
Tx
(MHz)
Rx
(MHz)
Tx
(MHz)
Rx
(MHz)
Tx
(MHz)
Rx
(MHz)
(MHz)
(MHz)
(MHz)
(MHz)
(MHz)
(MHz)
0
1
150.000~173.995
+45.050
162.000
162.100
150.000
150.100
173.975
173.900
162.500
162.550
162.600
162.550
162.650
0
2
136.000~149.995
+45.050
143.000
143.100
136.000
136.100
149.975
149.900
143.500
143.550
143.600
143.550
143.650
0
3
146.000~173.995
+45.050
160.000
160.100
146.000
146.100
173.975
173.900
160.500
160.550
160.600
160.550
160.650
0
4
144.000~147.995
+45.050
146.000
146.100
144.000
144.100
147.975
147.900
146.500
146.550
146.600
146.550
146.650
0
5
136.000~147.995
+45.050
142.000
142.100
136.000
136.100
147.975
147.900
142.500
142.550
142.600
142.550
142.650
0
6
136.000~173.995
+45.050
155.000
155.100
136.000
136.100
173.975
173.900
155.500
155.550
155.600
155.550
155.650
0
7
450.000~469.995
-45.050
460.000
460.100
450.000
450.100
469.975
469.900
460.300
460.350
460.400
460.350
460.450
0
8
400.000~419.995
-45.050
410.000
410.100
400.000
400.100
419.975
419.900
410.500
410.550
410.600
410.550
410.650
0
9
470.000~489.995
-45.050
480.000
480.100
470.000
470.100
489.975
489.900
480.500
480.550
480.600
480.550
480.650
0
10
490.000~511.995
-45.050
501.000
501.100
490.000
490.100
511.975
511.900
501.500
501.550
501.600
501.550
501.650
0
11
220.000~239.995
-45.050
230.000
230.100
220.000
220.100
239.975
239.900
230.500
230.550
230.600
230.550
230.650
1
1
240.000~259.995
-45.050
250.000
250.100
240.000
240.100
259.975
259.900
250.500
250.550
250.600
250.550
250.650
1
2
336.000~367.995
-45.050
352.000
352.100
336.000
336.100
367.975
367.900
352.500
352.550
352.600
352.550
352.650
1
3
368.000~395.995
-45.050
382.000
382.100
368.000
368.100
395.975
395.900
382.500
382.550
382.600
382.550
382.650
1
4
370.000~389.995
-45.050
380.000
380.100
370.000
370.100
389.975
389.900
380.500
380.550
380.600
380.550
380.650
1
5
350.000~369.995
-45.050
360.000
360.100
350.000
350.100
369.975
369.900
360.500
360.550
360.600
360.550
360.650
1
6
406.000~429.995
-45.050
418.000
418.100
406.000
406.100
429.975
429.900
418.500
418.550
418.600
418.550
418.650
1
7
400.000~429.995
-45.050
415.000
415.100
400.000
400.100
429.975
429.900
415.500
415.550
415.600
415.550
415.650
1
8
430.000~439.995
-45.050
435.000
435.100
430.000
430.100
439.975
439.900
435.500
435.550
435.600
435.550
435.650
1
9
438.000~449.995
-45.050
444.000
444.100
438.000
438.100
449.975
449.900
444.500
444.550
444.600
444.550
444.650
1
10
480.000~519.995
-45.050
500.000
500.100
480.000
480.100
519.975
519.900
500.500
500.550
500.600
500.550
500.650
1
11
441.000~451.000
-45.050
446.000
446.100
441.000
441.100
450.975
450.900
446.500
446.550
446.600
446.550
446.650
CH QT/DQT
OFF
OFF
OFF
OFF
OFF
OFF
OFF
023
023
127.3
151.4

TC-600 Circuit Description
－11 －
Circuit Description
1. Frequency Configuration
The receiver utilizes double conversion superheterodyne. The first IF is 45.050MHz and the second
is 455 KHz. The first local oscillator signal is supplied from PLL circuit. Frequency needed in the
transmitter is supplied from PLL circuit. Figure 1 shows the frequency configuration.
Frequency Range: 400 MHz—420MHz 450 MHz—470MHz
136 MHz—150MHz 150 MHz—174MHz
Figure 1 Frequency Configuration
2. Receiver
The receiver utilizes double conversion superheterodyne.
1) Front-End RF Amplifier
The input signal from antenna is amplified in RF amplifier (Q27) after passing through the
receive/transmit switch circuit and a 3-stage LC band pass filter. The amplified signals are
filtered by a band pass filter (a 3-stage LC BPF) to eliminate unwanted signals before they
goes to the first mixer.
MCF
45.050MHz
44.595MHz

TC-600 Circuit Description
－12 －
Figure 2 Receiver Section Configuration
2) The First Mixer
The signal from RF amplifier is mixed with the first local oscillator signal from PLL frequency
synthesizer in the first mixer (Q23) to generate a 45.050MHz first IF signal. The first IF signal is then
fed through two monolithic crystal filters (XF1) to remove spurious signals from adjacent channels.
3) IF Amplifier
The first IF signal is amplified in Q22 and then enters the IF processing chip IC1. The signal is mixed
with the second local oscillator signal in IC1 to create a 455KHz second IF signal. The second IF
signal is then fed to a 455KHz ceramics filter (CF1) to eliminate unwanted signals before it is amplified
and detected in IC1.
4) AF Amplifier
The demodulated AF signal obtained from IC1 is amplified in IC7 (1/4), and then filtered by low pass
filter Q19 and high pass filter Q20, and then de-emphasized by R130 and C156. The resulting AF
signal passes through a volume control circuit and then is amplified to a sufficient level to drive the
speaker byAF power amplifier (IC8).
5) Squelch
Part of the AF signal from IC1 reenters IC1, and the noise component is amplified and rectified by a
filter and an amplifier to produce a DC voltage corresponding to the noise level. The DC signal goes to
the analog port of the microprocessor (IC11). IC11 determines whether to output sounds from the
speaker by detecting whether the input voltage is higher or lower than the preset value.
To output sounds from the speaker, IC11 sends a high level signal to the MUTE and AFCO lines and
turns on IC8 through Q12.

TC-600 Circuit Description
－13 －
DET
FM IF IC1
IF AMP
HPF
AMP
IC7
AF LPF HPF
DET
239 40 1
SW
Q12
SW
AF/PF AMP
IC7
LPF
IC11
MCU
BUSY
MUTE
AFCO
TI
IC8
SP
Figure 3. AF Amplifier and Squelch Circuit
6) Receive Signaling
CTCSS/CDCSS
Over 300Hz audio frequencies of the signal output from IC1 is cut off by a low pass filter. The resulting
signal enters the microprocessor IC11. IC11 determines whether the CTCSS/CDCSS matches the
preset value, and controls the MUTE, AFCO and the speaker output according to the squelch results.
2-Tone
The output 2-Tone signal from IC1 goes to IC7 (1/4) for voltage amplification, then is processed by
shaping circuit that is comprised of IC7 (2/4) and other components before being detected by IC11 Pin11.
IC11 determines whether the 2-tone matches the preset value, and controls MUTE, APCO and speaker
output according to squelch results.
3. PLL Frequency Synthesizer
PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.
1) PLL
The step frequency of PLL circuit is 5KHz\6.25KHz\12.5 KHz\10 KHz. A 12.8MHz reference
oscillator signal is divided at IC2 by a fixed counter to produce a 5 KHz\6.25KHz\12.5 KHz\10
KHz reference frequency. The output signal from voltage control oscillator (VCO) passes
through buffer amplifier Q14 and is divided at IC2 by the programmable dual-module counter.
The divided signal is compared in the phase comparator IC2 with the 5 KHz\6.25KHz\12.5 KHz\25
KHz reference signal. The output signal from phase comparator is filtered by a low-pass filter
and passed to the VCO to control the oscillator frequency. (See Figure 4)

TC-600 Circuit Description
－14 －
Figure 4 PLL Circuit
2) VCO
The operation frequency is generated by Q16 in transmit mode and by Q8 in receive mode.
The operation frequency generates a control voltage through the phase comparator to control
the varactor diodes, so that the oscillator frequency is made consistent with the preset
frequency in CPU (D2 and D3 in transmit mode, D7 and D8 in receive mode). In receive mode,
Q6 turns off Q16 and turns Q7 on, which causes the T/R pin to be set high. The T/R pin is set low in
transmit mode. The output from Q8 and Q16 is amplified by Q14 and sent to the buffer amplifier.
4. Transmitter
1) Transmit Audio
The modulation signal from microphone is amplified by IC3, pre-emphasized, then filtered by another
low pass filter（separate filter）(Q25 and Q24) to eliminate the frequencies higher than 3KHz. The
resulting signal enters the VCO for direct FM modulation. The voice voltage amplitude control circuit
（Q46\R131\R601）is used to switch between wideband and narrowband. (See Figure 5)
2) CTCSS/CDCSS Encoder
The signal needed by CTCSS/CDCSS encoder is generated by IC11 and FM-modulated to the PLL
reference signal. Since the reference OSC does not modulate the loop characteristic frequency or
higher, modulation is performed at the VCO side by splitter. (See Figure 5)
Figure 5 Transmit CTCSS

TC-600 Circuit Description
－15 －
3) DTMF/2-Tone Encoder
DTMF/2-Tone signalings are generated by IC11 and outputted in parallel by Pin 48-51. The output signal
is reshaped by resistor array CP7-CP10, then sent to IC3 (1/4) for amplification, and filtered by active
LPF consisting of Q25, Q24 and other components to eliminate the corresponding HF emission before
being passed to TX VCO for modulation. The modulated signal is applied to AF AMP through C254 for
ease of monitoring.
4) RF Amplifier
The transmit signal obtained from VCO buffer amplifier Q14 is amplified by Q15 and Q17. The amplified
signal is passed to power amplifier Q32 and Q31, and is capable of generating a 4.0W RF power. Q50
and R617 are used to toggle between high and low power.
5) Antenna Switch and LPF
The output signal from RF amplifier is passed through a low-pass filter network and a transmit/receive
switch circuit before reaching the antenna terminal. The transmit/receive switch circuit is comprised of
D11 and D12. D11 and D12 is turned on (conductive) in transmit mode and off (isolated) in receive
mode.
5. Power
The 5V reference power supply for the control circuit is derived from a LDO IC. The reference power
provides a 5V voltage in transmit mode [T_V], a 5V voltage in receive mode [R_V], and a 5V voltage
shared in both modes based on the control signal from the microprocessor.
6. Control System
The IC11 CPU operates at 7.3728MHz.