Humminbird VHF255SW - Manual (Page 73)

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NO SOUND FROM THE SPEAKER
If your VHF255S speaker is not emitting sound, refer to the Installation section, and
make sure that:
• The volume control is turned up high enough for you to hear.
• SQUELCH is set to the threshold point.
• The internal speaker is turned on (see Radio Setup: Turning the Internal
Speaker On/Off for more information).
Correct any problems discovered.
TRANSMITTING IS IMPOSSIBLE,
OR HIGH POWER CAN’T BE SELECTED
If your VHF255S cannot transmit, or you cannot select high power, refer to the
Installation section, and make sure that:
• Sufficient power is being supplied to the radio (12 Volts @ 7 Amps).
• The PTT key is operating correctly.
• The microphone or MIC jack are operating correctly.
• Change to another channel, as some channels are for low power or are
receive only.
• Press the HI/LOW/MEM key to select high power.
Correct any problems discovered.
LOW RECEIVER SENSITIVITY
If your VHF255S either has low receiver sensitivity (has difficulty receiving faint signals),
refer to the Installation section, and make sure that:
• The antenna is connected correctly.
• The connection between the coaxial cable and the radio base station is
correct and securely-fastened.
Correct any problems discovered.