Minelab F1A4 Instrukcja Obsługi Pobierz pdf (Strona 23)

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 23

5.1.5 Audio Reset Troubleshooting

5.1.5.1 Audio Reset Test

Momentarily press the AUDIO RESET button.

The F1A4 should immediately BEEP.

After 3 seconds the F1A4 should give five “high / low” beeps:

BEEP

The threshold tone level should now be set at the correct operating level (ie

just audible).

5.1.5.2 Troubleshooting

If the correct tones are not heard during the above procedure, remove the 6

screws from the front panel, pull the front panel away from the case, and check the

wiring from the PCB to the Front Panel and repair as necessary (also check the

ribbon cable for continuity). If there are still no tones, go to 5.2.5 for Front Panel

replacement procedure. If the Front Panel has already been replaced the PCB is

defective. Go to 5.2.4 for the PCB replacement procedure.

5.1.6 Earset Troubleshooting

Determine, by physical inspection or resistance testing, whether the fault lies

with the four pin connector, earphone or volume control (if fitted):

1. If the four pin connector requires replacement or retermination, go to 5.2.6.1.

2. If the earphone requires replacement or retermination, go to 5.2.6.2.

3. If the volume control is defective, repair or replace it, Section 5.2.6 is a guide

to earphone repair procedures.

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Minelab F1A4 Instrukcja Obsługi Strona 23