JRC JHS-770S -, Instruction Manual

Page: 138 / 162

Maintenance & Inspection
6-10
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 Displays nothing on the screen.
・
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
2
TX is displayed but no voice is
transmitted.
・ Malfunction in the handset
・
Malfunction in the controller cable
・ Malfunction in the AF signal transmission circuit
3
TX 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
・
Malfunction in the SQL control
・ 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 SQL does not suppress
noise. ・ Malfunction in the SQL 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.
Unable to control the radiotelephone
or DSC, but the VOL control, the
dimmer, and PWR key.
That controller is in the monitor
mode. Press ENT to obtain the access right
and after that, retry the operation.
Even if pressing ENT at the monitor
controller, the access right cannot
be obtained. Another controller with higher priority
is in use for communicating or
performing menu operations.
After finished at another controller,
retry the operation.
If the system is left on a screen
other than the status display for a
while, returns to the status display. After 10 minutes leaving, the
inactivity timer would be activated
and returned to the status display.
Regulated specification by ITU-R
M.493-11.
(Do not leave the equipment during
menu operation.)
The received distress call log have
erased without operating. Received distress calls are
automatically deleted after 48 hours. Regulated specification by IMO
A.803(19).
When a portable transceiver is
brought close to a controller, noise
comes out from a portable
transceiver. It is based on the influence of the
radio frequency noise slightly
generated from the lighting circuit of
a controller display.
Controller screen lighting is switched
off or a portable transceiver is kept
away 1m or more.
Note