5 - 4
ADJUSTMENT ADJUSTMENT CONDITION
OPERATION
ENTERING
ADJUSTMENT
MODE
• Connect the pin 14 of J301 to GND to enter the adjustment mode.
CODEC
FREQUENCY
1 • Connect the frequency counter to CP101
through a capacitor (1000 pF).
• Adjust C102 to set to 16.38400 MHz ±10 Hz.
MODEM
FREQUENCY
1 • Connect the frequency counter to CP216
through a capacitor (1000 pF).
• Adjust C207 to set to 2.457600 MHz ±3 Hz.
MODURATION
OUTPUT
LEVEL
1•
•
Connect the pin 1 of J301 to GND to enter the
transmit mode.
Connect the oscilloscope to pin 21 of J301.
• Adjust R264 to set to 350 mVp-p ±10 mV.
2 • Disconnect the pin 1 of J301 from GND after the
adjustment to quit the transmit mode.
QUITING
ADJUSTMENT
MODE
• Disconnect the pin 14 of J301 from GND to quit the adjustment mode.
5-3 UT-118 ADJUSTMENT
• CONNECTION (BOTTOM VIEW)
CP101
CODEC FREQUENCY
chek point
J301, pin 21
MODULATED SIGNAL LEVEL
check point
J301, pin 1
Connect to GND.
CP 216
MODEM FREQUENCY
check point
R264
MODULATION OUTPUT LEVEL
adjustment point
C102
CODEC FREQUENCY
adjustment point
C207
MODEM FREQUENCY
adjustment point
Power supply
8.0 V DC / 1 A
Power supply
5.0 V DC / 1 A
J301, Pin 14
Entering adjustment mode
• UT-118 TOP VIEW
• UT-118 BOTTOM VIEW
• ADJUSTMENT
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