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JRC JHS-32B Instruction Manual: Troubleshooting; Procedures For Locating Equipment Malfunctions

Marine vhf radiotelephone.
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5.2

Troubleshooting

This unit is also used for distress communication, in addition to usual
communication. Contact JRC or our agent if any problem is observed in this
unit on usual operation or inspection. Do not ignore and leave any problems
of this unit.
With the exception of qualified service personnel, do not attempt to service
the interior of this equipment, as doing so may cause fire, electric shock or
malfunction.
If internal inspection or repair is necessary, contact our service center or
agents.
5.2.1
Procedures for Locating Equipment Malfunctions
(1) Before checking electrical circuits, check the power supply voltage, fuses, and connectors.
(2) The following table shows the instruments required to effect repairs and the severity of the mal-
function.
Type of malfunction
Malfunctions requiring special equipment
Malfunctions that can be fixed by the user
Faults requiring no instrument to locate
WARNING
• Frequency error in the crystal oscillator
• Decrease in transmitting power and reception sensitivity
• Decrease or change in transmitter modulation level
• Malfunctions in semiconductors or ICs and similar equipment.
• Malfunctions in resistors and capacitors
• Power supply voltage fluctuations
• Breaks in internal wiring.
• Blown fuses
• Faulty contacts
• Broken antenna cables
• Defects of switches, controls, etc.
• Other problems that can be visually detected
Examples
5.2 Troubleshooting
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