Minelab F1A4 Manual de Serviço descarregar pdf (Página 22)

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 22

Release the switch so that it returns to the SEARCH position. Continue to

move the GB Test Piece up and down, approximately 25 to 100mm from the Coil.

The F1A4 should not respond to the test piece. If a response is heard check that

there is no metal on the technician or the GB Test Piece and repeat the test.

5.1.3.2 Troubleshooting

If a response is still heard repeat the test. If a response is still heard, replace

the coil and repeat the test. If a response is still heard, remove the 6 screws from

the front panel, pull the front panel away from the case, and use a multimeter to

check the circuit of the Off/Search/Balance switch (refer Section 7 for switch circuit

details). If the switch does not measure correctly, the switch is defective, go to 5.2.2

for the

Off/Search/Balance

switch replacement procedure. If the switch measures

OK, check wiring from the PCB to the Off/Search/Balance switch and repair as

necessary If the wiring if found to be OK, the PCB is defective. Go to 5.2.4 for the

PCB replacement procedure.

5.1.4 Noise Cancel Troubleshooting

5.1.4.1 Noise Cancel Test

Momentarily press the NOISE CANCEL button.

The F1A4 should immediately “beep”.

After 70 seconds the F1A4 should “beep” four times:

BEEP BEEP BEEP BEEP

5.1.4.2 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.

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Minelab F1A4 Manual de Serviço Página 22