HYT TC-700P, Service Manual, Page: 63 / 100

TC-700P Service Manual
63
Tuning Description
Required Test Instruments
(1) Communication Test Set 1 set
(2) Scanner 1 set
(3) 3A/10V Power Supply 1 set
(4) Digital Voltmeter 1 set
(5) 3A Ammeter 1 set
Preparations
1. Reset Your Radio
(1) Entering All Reset mode
Hold down SK1 + SK2 for two seconds while powering on the radio. Release them after the LED flashes
green three times, and your radio will enter All Reset mode.
(2) Selecting a frequency band
Rotate the Channel Selector knob to select an appropriate frequency band.
Channel 1: 136-174MHz;
Channel 2: 350-390MHz;
Channel 3: 400-470MHz;
Channel 4: 450-520MHz.
(3) Selecting a reset type
Reset Function: press SK1 key to begin resetting, and the LED solidly glows green;
Reset radioINFO: press SK2 key to begin resetting, and the LED solidly glows green;
Reset all data: press PTT key to begin resetting, and the LED solidly glows green;
Note: resetting will fail when the Channel Selector knob does not locate on any channel from channel 1
to channel 4. In this case, the LED would solidly glow red.
2. VCO Tuning
Test Tuning
Item Condition
Test
Instrument
Test
Point
Part Method
Specific
ations /
Remark
s
Setting Supply Voltage
1. CH: TX high freq. 3.9V±0.1V TX VCO lock voltage
2. CH: TX low freq.
TC114
Check >0.4V
RX VCO lock voltage 1. CH: RX high freq.
Digital
Voltmeter
CV
4.0V±0.1V