JRC JHS-770S Instruction Manual page 125

6. MAINTENANCE & INSPECTION
The performance and lifetime of the equipment depend on the appropriate maintenance.
This chapter describes the maintenance and inspection, self diagnosis, and outline of adjustment.
6.1
General maintenance & inspection
In order to operate the equipment under optimum conditions, it is vital to perform regular inspections and also, to
keep accurate records. Inspections enable problems to be identified before they become major malfunctions.
The following inspections should be made regularly.
Inspection
Inspection items
sequence
1 Antenna system
2 Squelch operation
Receiver condition checked
3
by speaker output.
4 Handset PTT switch
Transmission and reception
5 checked by performing radio
communication.
Check that antennas and the connectors are secure.
Lift the handset of the accessible controller, and turn the SQL
control fully counterclockwise. Check for noise from the speaker.
Check noise to be suppressed by turning the SQL control
clockwise.
Check that the voice level and noise level are not abnormally
loud or soft.
Press PTT and check that the unit transmits immediately and
that TX is displayed on the screen.
Check that normal conversation is possible.
Maintenance & Inspection
Procedure
6-1