F1A4 Control Box And Earset Repair Procedures - Minelab F1A4 Service Manual

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance
5.2 F1A4 CONTROL BOX REPAIR PROCEDURES
This section covers individual F1A4 Control Box repair procedures required
after Section 5.1 Troubleshooting. After any repair has been carried out, return to
Section 4 for a complete functional test of the F1A4 Control Box.
5.2.1 Loudspeaker Replacement
1. Place F1A4 Control Box on an Anti-static mat, ensuring that the wrist strap is
being worn and is firmly connected to the Anti-static mat.
2. Remove the 6 screws from the front panel and pull the front panel away from
the case.
3. Desolder wires from Loudspeaker.
4. With a sharp knife, carefully remove the glue holding the Loudspeaker to the
Front Panel and remove the Loudspeaker.
5. Position the new Loudspeaker and, using a hot glue gun, carefully run a bead
of glue around the outside of the new Loudspeaker, ensuring that no glue
gets into the Loudspeaker.
6. Allow the glue to set.
7. Resolder wires to Loudspeaker and refit Front Panel.
8. Go to Section 4 to retest the F1A4 Control Box.
5.2.2 Off/Search/Balance switch replacement
1. Place F1A4 Control Box on an Anti-static mat, ensuring that the wrist strap is
being worn and is firmly connected to the Anti-static mat.
2. Remove the 6 screws from the front panel and pull the front panel away from
the case.
3. Remove PCB from case (refer to 5.2.4 if required).
4. Remove dust boot from Off/Search/Balance switch (hold the switch to
prevent the switch and wiring from twisting).
5. Desolder switch wires from PCB, noting their positions.
6. Remove defective switch and position new switch.
7. Refit dust boot whilst holding the switch, ensuring that the new switch is
correctly oriented (momentary position to Balance).
8. Solder wires of new Off/Search/Balance switch to PCB, ensuring that the
wires are connected to the correct holes on the PCB (refer Section 7 if
required).
9. Refit PCB into case (refer 5.2.4 if required).
10. Go to Section 4 to retest the F1A4 Control Box.
5.2.3 Not used.
5.2.4 Replacing the PCB Assembly
1. Place F1A4 Control Box on an Anti-static mat, ensuring that the wrist strap is
being worn and is firmly connected to the Anti-static mat.
2. Remove the 6 screws from the Front Panel and pull the Front Panel away
from the case.
3. Remove the 6 screws from the Rear Panel and pull the Rear Panel away
from the case.
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