Software Adjustment - Icom IC-M72 Service Manual
Vhf marine transceiver
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Also See for IC-M72:
- Instruction manual (40 pages) ,
- Instruction manual (40 pages) ,
- Instruction manual (20 pages)
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5-2 SOFTWARE ADJUSTMENT (FREQUENCY)
Select the adjustment item with [↑] / [↓] keys, then set the value with [←] / [→] keys on the connected PC.
ADJUSTMENT
PLL LOCK
1 • Operating CH. : 16
VOLTAGE
• Receiving
(Verify)
2 • Operating CH. : 16
• Connect a dummy load or RF power
meter to the antenna connector.
• Transmitting
REFERENCE
1 • Operating CH. : 16
• Connect the RF power meter or a 50 Ω
FREQUENCY
[Ref Freq]
dummy load to the antenna connector.
• Transmitting
ADJUSTMENT CONDITION
NOTE: The above screen is an example.
Each transceiver has its own specific values.
MEASUREMENT
UNIT
OPERATION
PC
Click the "I/O check button" on
screen
the CS-M72 ADJ's screen (see
page 5-3) to open the I/O check
window as below.
Top
Loosely couple the frequency
Panel
counter to the antenna conector.
5 - 4
VALUE
1.65–2.65 V
(Verify)
1.75–2.75 V
(Verify)
156.8000 MHz
PLL LOCK VOLTAGE
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Questions and answers
Sound does not work
The sound might not work on the Icom IC-M72 due to the following reasons:
1. Squelch Level: The squelch level may be set too high, which blocks audio. Adjust it by pushing the appropriate buttons (`[ ]`, `[Y]`/`[Z]`) to lower the squelch level.
2. Volume Setting: The volume may be set too low. Rotate the `[VOL]` knob to increase the volume.
3. Signal Reception: Ensure the radio is receiving a signal. The " " indicator should appear when a signal is being received, and audio should emit from the speaker.
4. Speaker Issue: Check if the speaker is functioning properly. If the external speaker or audio output is faulty, repair or replacement may be needed.
5. Incorrect Channel: Verify that the correct channel is selected, as some channels may not have active transmissions.
If these adjustments do not resolve the issue, further inspection or servicing may be required.
This answer is automatically generated