Icom IC-2820H Instruction Manual - Page 155

Fuse replacement

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MAINTENANCE 17 PROBLEM POSSIBLE CAUSE SOLUTION Some memory channels • The memory channel number has not yet been • Select the channel via the microphone keypad to cannot be selected via the programmed. check whether the channel has been programmed tuning dial. or not. REF. - Scan does not operate. • The squelch is open. • Set the squelch to the threshold point. p. 22 • Only 1 memory channel is programmed or other • Program other memory channels or cancel the pgs. 62, channels are set as skip channels. memory skip function in the desired channels. 63, 79 • Priority watch is activated. • Cancel the watch. p. 81 Transmission is automati- • Time-out timer is activated. cally cut off. • Set the timer to OFF. p. 101 Transmission continues • One-touch PTT function is activated. even when the PTT is released. • Turn the function OFF. p. 26 During tone squelch opera- • Transmitter's microphone gain is too high. tion, the received audio breaks off at the other station. • Select low microphone sensitivity in set mode. • Turn the ALC function ON in set mode. p. 102 p. 102 The function display shows • The CPU is malfunctioning. erroneous information. • Reset the CPU. p. 116 ■ Fuse replacement If the fuse blows or the transceiver stops functioning, find the source of the problem if possible, and replace the blown fuse with a new, properly rated one (FGB 20 A) as shown at right. 20 A fuse 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 134

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134
17
MAINTENANCE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
PROBLEM
POSSIBLE CAUSE
SOLUTION
REF.
Some memory channels
cannot be selected via the
tuning dial.
Scan does not operate.
Transmission is automati-
cally cut off.
Transmission
continues
even when the PTT is re-
leased.
During tone squelch opera-
tion, the received audio
breaks off at the other station.
The function display shows
erroneous information.
• The memory channel number has not yet been
programmed.
• The squelch is open.
• Only 1 memory channel is programmed or other
channels are set as skip channels.
• Priority watch is activated.
• Time-out timer is activated.
• One-touch PTT function is activated.
• Transmitter’s microphone gain is too high.
• The CPU is malfunctioning.
• Select the channel via the microphone keypad to
check whether the channel has been programmed
or not.
• Set the squelch to the threshold point.
• Program other memory channels or cancel the
memory skip function in the desired channels.
• Cancel the watch.
• Set the timer to OFF.
• Turn the function OFF.
• Select low microphone sensitivity in set mode.
• Turn the ALC function ON in set mode.
• Reset the CPU.
—
p. 22
pgs. 62,
63, 79
p. 81
p. 101
p. 26
p. 102
p. 102
p. 116
■
Fuse replacement
If the fuse blows or the transceiver stops functioning,
fi
nd the
source of the problem if possible, and replace the blown fuse
with a new, properly rated one (FGB 20 A) as shown at right.
20 A
fuse