Guide To Locating Faults - JRC JHS-770S Instruction Manual

Marine vhf radiotelephone
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Maintenance & Inspection
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
1
Displays nothing on the screen.
TX
is displayed but no voice is
2
transmitted.
TX
is not displayed, and
3
transmission is not possible.
4
Reception sensitivity is poor.
No sound from the speaker even
5
when squelch is opened without
reception.
Noise is output from the speaker, but
6
own ship cannot receive any calls.
Turning SQL does not suppress
7
noise.
Note
The following are not faults.
Symptom
No response from other station via
radiotelephone or DSC call.
Unable to control the radiotelephone
or DSC, but the VOL control, the
dimmer, and PWR key.
Even if pressing ENT at the monitor
controller, the access right cannot
be obtained.
If the system is left on a screen
other than the status display for a
while, returns to the status display.
The received distress call log have
erased without operating.
When a portable transceiver is
brought close to a controller, noise
comes out from a portable
transceiver.
6-10
・ Malfunction in the controller cable
・ Abnormal power supply voltage
・ Power supply fuse is blown
・ Malfunction in the power switch
・ Malfunction in the display circuit
・ Malfunction in the control circuit
・ Malfunction in the handset
・ Malfunction in the controller cable
・ Malfunction in the AF signal transmission circuit
・ Malfunction in the handset PTT switch
・ Malfunction in the hook detection circuit
・ Malfunction in the transmission circuit
・ Antenna damage
・ Break or short circuit of antenna cable
・ Faulty contact in antenna connectors
・ Malfunction in the speaker
・ Malfunction in the SQL control
・ Malfunction in the receiver circuit
・ Antenna damage
・ Break or short circuit in antenna cable
・ Faulty contact in antenna connectors
・ Malfunction in the receiver
・ Malfunction in the SQL control
・ Malfunction in the receiver
Possible causes
No operator in that station, or
unavailable to respond due to other
duties.
That controller is in the monitor
mode.
Another controller with higher priority
is in use for communicating or
performing menu operations.
After 10 minutes leaving, the
inactivity timer would be activated
and returned to the status display.
Received distress calls are
automatically deleted after 48 hours.
It is based on the influence of the
radio frequency noise slightly
generated from the lighting circuit of
a controller display.
Typical causes
Handling
Wait and retry later.
Press ENT to obtain the access right
and after that, retry the operation.
After finished at another controller,
retry the operation.
Regulated specification by ITU-R
M.493-11.
(Do not leave the equipment during
menu operation.)
Regulated specification by IMO
A.803(19).
Controller screen lighting is switched
off or a portable transceiver is kept
away 1m or more.

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