Ut-118 Adjustment - Icom IC-V82 Service Manual

5-3 UT-118 ADJUSTMENT

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