JETStream JT220M, Service Manual

Page: 10 / 42

JT220M
1
ADJUSTMENT
PCB Section
Item Condition
Measurement Adjustment
Specifications
/Remarks Test equipment Terminal Parts Method
1. Setting 1) Power supply voltage
DC Power supply terminal : 13.8V
2. VCO lock
voltage
1) CH: TX high
Digital voltmeter TC2
CV201 3.3 V ±0.5V
2) CH: RX high CV200 3.3 V ±0.5V
3) CH: TX low
Check More than 0.6V
4) CH: RX low
Transmitter section
Item Condition
Measurement Adjustment Specifications
/Remarks
Test equipment Terminal Parts Method
1. Frequency 1) CH: TX center
2) Transmit
Frequency counter
ANT
Encoder
knob
Adjust to the frequency Within ±200Hz
2. Maximum
power
alignment
1) CH : TX high
2) Adjustment HEX value : FF
3) Transmit
Power meter
VR200 55W
3. High
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
Encoder
knob
50W
±
5.0W
4. Mid
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
10W
±
2W
5. Low
power
1) CH : TX low
CH : TX low’
CH : TX center
CH : TX high’
CH : TX high
2) Transmit
5W
±
1W
6. DCS
balance
1) CH : TX center
2) Transmit
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Adjust the waveform as
below
7.Max
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) AG : 1kHz/120mV
3) Transmit
Modulation
analyzer or linear
detector
(LPF15kHz)
Oscilloscope
AG
AF. V. M
ANT
MIC
±
4.3kHz (Wide)
±
2.1kHz (Narrow)
According to the large +,
–
±
200Hz
±
100Hz