HYT TC-580 Service Manual
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Adjustment Description
Required Test Instruments
Radio communication test set (HP8921) 1 set
10V/3A regulated DC power supply 1 set
Digital voltmeter 1 set
Ammeter 1 set
Preparation
Place the board to be tested on the test fixture (please ensure good connection between each test point
and the fixture), and connect the board to a power supply.
Tuning Procedures
1. Operations before Tuning
1) PCB Tuning:
Before the PCB arrives each work station for specification inspection, programs must be
downloaded and EEPROM must be initialized by the profiles (downloading with a test
framework/ initializing via programming software or through wired clone). If any adjustment is
required, apply a programming cable to enter the adjustment mode for PC programming or
manual adjustment.
2) Radio Tuning:
1) Manual Tuning: Hold down PTT and SK1 for 2 seconds while powering on the radio. Then
the LCD displays “Tuning Mode”. After the keys are released, press OK, and then press
UP/DN to select your desired tuning item. To enter this item, press OK again. To return to the
previous menu, press C. The LED solidly glows red for TX group items and green for RX
group items. Follow the operation instructions to tune each item.
2) Automatic Tuning: Connect a programming cable to the radio for real-time tuning through
PC.
3) Wired Clone:
1) Connect two radios using a cloning cable. Then hold down SK1 for 2 seconds while
powering the source radio on, and the radio enters Clone mode, with red LED flashing once.
The target radio can be directly turned on to enter the mode.
2) Press SK2 in Clone mode to switch to Factory Clone mode, with red LED flashing twice.
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(Note: The Factory Clone Mode option must be checked through the programming software.)
3) Press PTT to begin cloning. During cloning, LED of the source radio glows red, while LED
of the target radio glows green. Upon completion of cloning, LED of the source radio solidly
glows orange. If any error occurs during cloning, LED of the source radio flashes orange.
Press OK to return to Clone mode upon either cloning success or failure.
4) You can clone the data to multiple target radios in the same way.
2. Description of Tuning Items
TC-580 Tuning Items
Wide Band Narrow Band
Channel
Tunable Frequency
Freq.
1
Freq.
2
Freq
. 3
Freq.
4
Freq.
5
Freq.
1
Freq.
2
Freq.
3
Freq.
4
Freq.
5
TX Section
1 Preset Power Y
2 Frequency Tolerance Y
3 TX Low Power Y Y Y Y Y
4 TX High Power Y Y Y Y Y
5 CDCSS Balance Y Y Y Y Y
6 CDCSS Deviation Y Y Y Y Y Y Y Y Y Y
7 CTCSS L Deviation Y Y Y Y Y Y Y Y Y Y
8 CTCSS M Deviation Y Y Y Y Y Y Y Y Y Y
9 CTCSS H Deviation Y Y Y Y Y Y Y Y Y Y
10 DTMF Deviation Y Y Y Y Y Y Y Y Y Y
VOX Gain 1 Y
VOX Gain 2 Y
VOX Gain 3 Y
VOX Gain 4 Y
11
VOX
Gain
VOX Gain 5 Y
12
TX Low Voltage
Threshold
Y
13
Max. Deviation of TX
Audio
Y Y Y Y Y Y Y Y Y Y
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RX Section
14
SQL Level 1 ON
Y Y Y Y Y Y Y Y Y Y
15 SQL Level 5 ON Y Y Y Y Y Y Y Y Y Y
16 SQL Level 9 ON Y Y Y Y Y Y Y Y Y Y
17 SQL Level 1 OFF Y Y Y Y Y Y Y Y Y Y
18 SQL Level 5 OFF Y Y Y Y Y Y Y Y Y Y
19 SQL Level 9 OFF Y Y Y Y Y Y Y Y Y Y
20
RX Low Voltage
Threshold
Y
21 Max. RX Volume Y
22 Bandpass Filter Y Y Y Y Y
Note:
Y indicates frequencies that can be tuned, and the rest are blank
channels not available for tuning.
1) Entry into a tuning item
Hold down PTT and SK1 for 2 seconds while powering on the radio. Then the LCD displays
“Tuning Mode”. Press OK to enter the item. (Please note that TX Item is the default item.) And use
UP/DN to switch between TX Item and RX Item. After the item is selected, press OK to enter
submenu under this item. Press OK to enter the desired tuning item or press C to return to the
previous menu.
2) Wide/Narrow Bandwidth Switch and Frequency Switch in a Tuning Item
After an item is entered, press UP/DN to switch the frequency or wide/narrow bandwidth. Press OK
to save and return to the previous menu upon completion of tuning.
3) Value Tuning
Short press SK1 under certain bandwidth and certain tuning item to decrease the tuning value in
the step of 1; hold down the key to decrease the value continuously in steps of 1. The tuning value
will remain unchanged once it reaches the allowed minimum value.
Short press SK2 under certain bandwidth and certain tuning item to increase the tuning value in the
step of 1; hold down the key to increase the value continuously in steps of 1. The tuning value will
remain unchanged once it reaches the allowed maximum value.
4) Measures on special items
SQL On 5, SQL Off 5 and RX Low Voltage Threshold: These tuning items are related to AD
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sampling. Press SK1 or SK2 after entering the above items, to activate AD sampling (including
calculation) once. Press OK to save the current AD sampling value and exit. If neither of SK1 or
SK2 is pressed, the tuning value will not be updated, and AD sampling will not be activated.
5) Description of key-press
Please refer to “Software Specifications →Description of Modes → Manual Tune Mode →
Description of key-press” on page 12.
6) Tuning Items
TX group items: include the Preset Power, Frequency Tolerance, TX Low Power, TX High Power,
CDCSS Balance, CDCSS Deviation, CTCSS Deviation (low), CTCSS Deviation
(Medium), CTCSS Deviation (high), DTMF Deviation, TX Low Voltage
Threshold and Max. Deviation of TX Audio tuned in tuning mode via software,
and VCO Lock Voltage tuned out of the tuning mode via hardware.
Rx Group Items: include the Squelch, RX Low Voltage Threshold, Max. RX Volume and RX
Bandpass Filter tuned in tuning mode, and VCO Lock Voltage tuned out of the
tuning mode.
3. Specific Operations and Requirements
1) Tuning out of the mode
Note: CH1, CH2 and CH3 must be preset as wide bandwidth with low, medium and high frequency
respectively and CH4, CH5 and CH6 as narrow bandwidth with low, medium and high frequency
respectively. Make sure the antenna or load is connected before adjustment.
Tuning of TX/RX VCO Voltage
Test Adjustment
Item Condition
Test Instrument Test point Part Method
Specifications
/ Remarks
Set the channel to
CH3 and press
PTT to transmit.
Adjust TC101 with
ceramic tuning tool until
the lock voltage meets
the requirements.
4.0V±0.2V TX
VCO
Lock
Voltage
Set the channel to
CH1 and press
PTT to transmit.
TC101
Check
≥0.5V
Set the channel to
CH3.
Adjust TC102 with
ceramic tuning tool until
the lock voltage meets
the requirements.
4.0V±0.2V
Rx
VCO
Lock
Voltage
Set the channel to
CH1.
Digital
Voltmeter
CV
TC102
Check
≥0.5V
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