HYT TC-500, Service Manual, Page: 60 / 77

TC-500 Service Manual
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Adjustment Description
The radio can be adjusted with PC programming software or by manual adjustment. Manual adjustment
procedure of TC-500 is as follow. (Refer to “model set mode”and “manual adjust mode”in the section
Software Specification.)
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. Initialization:
It’s necessary to set the model and initialize the radio before adjustment because there is no
needed information in EEPROM when the radio is manufactured. Please refer to the “model set
mode”in the section
Software Specification
for details.
2. Adjustment:
Some items can be adjusted in conventional communication mode and the others in manual adjust
mode. Turn on the radio, the radio enters conventional communication mode. If manual adjust mode
is enabled, turn on the radio while holding down PTT and MONI keys simultaneously, the radio
enters manual adjust mode after 2 seconds. (Refer to the section
Software Specification
.)
VCO
Item Condition
Measurement Adjustment
Specifications
/Remarks
Test
Instrument
Terminal Part Method
1.Power
supply
1.power voltage DC 6V
2.Transmit
VCO lock
voltage
1. TX High. Turn to CH15 in
manual adjust mode and
press PTT .
Digital
Voltmeter
CV
TC1
3.0V±0.2V
2. TX Low. Turn to CH14 in
manual adjust mode and
press PTT . >0.8V
3. Receive
VCO lock
voltage
1. RX High. Turn to CH15 in
manual adjust mode.
TC2
2.6V±0.2V
2. RX Low. Turn to CH14 in
manual adjust mode. >0.8V