Users Manual

Maintenance & Inspection
6-11
6.6.2. Guide to locating faults
Use the following table as a guide to locating the causes of malfunctions in the equipment.
Additionally, when contacting JRC or our agency, please provide the malfunction condition.
No. Symptom Typical causes
1
Nothing appears on the screen.
• Abnormal power supply voltage
• Main unit's power supply fuse is blown
• Defective power supply switch, display circuit, or
control circuit
• Defective controller cable
2
is displayed but no voice is
transmitted.
• Malfunction in the handset
• Malfunction in the controller cable
• Malfunction in the AF signal transmission circuit
3
is not displayed, and
transmission is not possible.
• Malfunction in the handset PTT switch
• Malfunction in the hook detection circuit
• Malfunction in the transmission circuit
4
Reception sensitivity is poor.
• Antenna damage
• Break or short circuit of antenna cable
• Faulty contact in antenna connectors
5
No sound from the speaker even
when squelch is opened without
reception.
• Malfunction in the speaker
• Defective SQ control circuit or harness
• Malfunction in the receiver circuit
6
Noise is output from the
speaker, but own ship cannot
receive any calls.
• Antenna damage
• Break or short circuit in antenna cable
• Faulty contact in antenna connectors
• Malfunction in the receiver
7
Turning SQ does not suppress
noise.
• Malfunction in the SQ control
• Malfunction in the receiver
The following are not faults.
Symptom Possible causes Handling
No response from other station via
radiotelephone or DSC call.
No operator in that station, or
unavailable to respond due to
other duties.
Wait and retry later.
Cannot control the radiotelephone
or DSC, but can control VOL,
dimmer and PWR buttons.
Operations are limited due to
no access right.
Press OPE button to obtain
the access right and after
that, retry the operation.
Cannot obtain the access right
even if pressing OPE button on a
main unit or controller with no
access right when there is one or
more controllers.
The main unit or another
controller with higher priority is
in use for communicating or
performing menu operations.
After operations are
complete on the main unit or
other controller, retry again.
If the system is left on a screen
other than the status display for a
while, returns to the status display.
After leaving the specified
period, the inactivity timer
would be activated and
returned to the status display.
Do not leave the system
when operating the menu.
Received distress call logs have
been erased without operating.
Received distress calls are
automatically deleted after 48
hours.
To save the received distress
messages, print out them.
When a portable transceiver is
brought close to the main unit or
the controller, noise comes out
from the portable transceiver.
The influence of the radio
frequency noise occurs, which
is slightly generated from the
lighting circuit of the LCD.
Turn off the light for the LCD
or keep the portable
transceiver at least
1 m away.
The VHF operation on the MFD
(ECDIS or Marine radar) screen is
not available.
The main unit is turned off and
on again and the link with the
MFD is not established
normally.
On the MFD screen, restart
the VHF Call dialog/ menu.
Incase of the multiple VHF radio
onboard, when transmitting from
the one VHF radio, the squelch of
another VHF radio setting different
channel is opened.
The radio interference occurs
by the excessive RF input level
because the antennas are not
mounted directly above or
below each other.
Turn the squelch control
clockwise so that the squelch
is not opened when receiving
such an excessive radio
wave.
Note