Users Manual

Maintenance & Inspection
6-10
6.6 Troubleshooting
WARNING
If any problem is observed in this unit on usual operation or inspection, contact
JRC or our agent. In addition to usual communication, this unit is also used
for the distress communication.
Always use the specified fuse when replacing a fuse. Using a different fuse
may result in fire or malfunction.
Do not open the equipment to inspect or repair it. Inspection or repairs by
anyone other than a specialized technician may result in fire, electrical shock,
or malfunction.
If internal inspection or repair is necessary, contact our service center or
agents.
6.6.1. Procedures for locating malfunctions
1) First, check the power supply voltage, fuses, and connectors.
2) If there are no problems with the above, use a tester to check for errors.
The following table shows the instruments required for effect repairs and the severity of the
malfunctions.
If required to locate the malfunction, with the exception of qualified service personnel, perform
the following No. 1 and 2 only.
No. Type of Malfunction Examples
1
Faults requiring no instrument to
locate
Blown power supply fuse
Faulty contacts
Broken antenna cables
Defective switches, volume, etc.
Other problems that can be visually detected
2
Malfunctions that can be fixed with
a tester and repaired
Power supply voltage confirmation
Breaks in internal wiring
3
Malfunctions requiring special
instrument
Crystal oscillator frequency error
Decrease in transmitting power and reception
sensitivity
Decrease in transmitter modulation level
Malfunctions in semiconductors, ICs, and
similar equipment