Cable - Icom IC-725 Instruction Manual

MAINTENANCE
AND ADJUSTMENT
g
8-6
TROUBLESHOOTING
lf
y°
u
are
not ab,e to locate the cause of
a
problem
or solve
it
through
the use of
this chart,
contact
your
nearest
I
com
The
following chart
is
designed to help
you
correct pro- Service Center or Dealer,
blems which
are
not
equipment
malfunctions.
PROBLEM
POSSIBLE
CAUSE SOLUTION
REF.
• Power
does not
come
on
when
the
[POWER]
switch
is
pushed.
•
Power
cable
is
improperly connected.
•
Fuse
is
blown.
(Fuses are
installed in
two
places.
One
is
installed in
the
DC
power
cable
and
the
other
is
installed
in
the
PA
unit.
See
p.
25
for their locations.)
•
Battery
is
exhausted.
• Reconnect
the
power
cable securely.
• Check
for the cause,
then
replace
the fuse with
a
spare one.
DC
power
cable
PA UNIT
• Check the battery voltage with the
transceiver
turned ON.
P.
7
p.
25
P.
7
•
No
sound comes from
the
speaker.
• Volume
level
is
too
low.
• The
squelch
is
closed.
•
The
transceiver
is
in
transmit
mode.
•
An
external speaker or
headphones
are in
use.
•
T*hp
"trsin^ppiv/Pr
ic
in
FIV/I
mnrip
w
1
IIC
11
Ol
IOUCIVCI
15 III
1
IVI
IMUUC.
• The
transceiver
is
in
CW
narrow mode.
• Rotate the [AF]
control
clockwise
to obtain
a
suitable listening level.
• Rotate
the
[SQL]
control
counterclockwise
to
open
the squelch.
•
Push the
[TRANSMIT]
switch to the out
position to return to receive
mode.
• Check
the
external
speaker
or
headphones
plug
connection.
A
finorotinn
in
PIV/I
mnHo
rQfit livoc sin
nn+i^nal
m
Upcrdlliiy
111
r
IVI
(TlUUc
icl^UIICb
dil UpilUflal
UI-7
AM
•
FM
UNIT.
• Operating
CW
narrow
mode
requires either the
FL-100
or
FL-101
(sold separately).
p.
15
p.
15
P.
2
p.
6
p.
ZU
p.
18
•
Sensitivity
is
low.
• The
antenna
feedline
is
cut or shorted.
• Attenuator
circuit
is
inserted
in
the
RF
circuit.
• Antenna
is
not properly
tuned
when
using the
AH-3.
• Check
the feedline
and
correct
any improper
conditions.
• Push
the
[ATT]
switch to the out position to
disconnect the
circuit.
• Push
the
[TUNE]
switch
to
tune the antenna.
p.
5
p.
15
p.
10
• Receive
signal
is
distorted
with strong
signals.
• The
noise blanker function
is
turned
ON. • Push
the [NB] switch to the out
position to
turn
OFF
the function.
p.
15
•
Output power
is
low.
• Output power
is
set at low.
• Mic
gain
is
set at
low.
• The
antenna
feedline
is
cut or shorted.
• Operating
mode
is
set to
AM.
• Rotate
the
[RF
PWR]
control clockwise.
Clockwise
rotation increases
the power.
• Rotate
the [MIC] control clockwise. Clock-
wise rotation increases the
mic
gain.
• Check
the
feedline
and
correct
any
improper
conditions.
• The
transceiver outputs
40
W
maximum
in
AM.
p.
16
p.
16
p.
5
p.
19
•
No
contact possible
with
another
station.
• Transmit and
receive frequencies
are
not
the same.
• Push
the [RIT] switch to turn
OFF
the func-
tion.
p.
15
• Transmitted
signals are
distorted.
• The mic
gain
is
set
too
high.
• Rotate
the [MIC]
control
counterclockwise
to
reduce the
gain.
p.
16
• The
displayed frequency
does not change
properly.
• The
dial
lock function
is
activated.
• The
internal
CPU
has malfunctioned.
• Push thp
N
OPKl
cwitrh tn thp nut
nnsitirm
to release the function.
• Turn the
power OFF. Then
turn the
power
ON
again while pushing the
IFUNCJ and IMWJ
switches.
n 9
p.
z
p.
25
• Scan does not
operate.
• Squelch
is
open.
• Both
scan edges are
set
improperly
for
Programmed
scan.
• Frequencies
are
not
memorized
in
me-
mory
channels
for
Memory
scan.
• Set the squelch threshold
point.
• Reset
scan edges.
• Program
frequencies into
memory
channels.
p.
15
p.
23
p.
22
•
All
programmed
memories
have been
erased.
•
The
backup
battery
is
empty. • Replace
the
backup
battery.
p.
25
•
All
memory
channels
are
not displayed.
•
The [LOCK]
switch
is
pushed
IN.
• Push
the
[LOCK]
switch
OUT.
P-
22