Minelab F1A4 Manuel de service télécharger pdf (Page 29)

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 29

5.2.6 Earset Repair Procedures

5.2.6.1 Four Pin plug repair

Refer to the illustration at end of this section.

Parts required:

Minelab PN Qty Description

1. 2301-0013 one (if req’d) Four pin plug

2. 9501-0024 1.5m (If req’d) Earset cable

3. NA 10mm Green heatshrink, 3.2mm, non-adhesive

(Earset Speaker Off only)

4. NA 98mm Black heatshrink, 4.8mm, non-adhesive

(1 x 40mm, 1x 33mm, 1 x 25mm)

5. NA As Req’d Silver Solder

6. NA As Req’d Multi flux cored 60/40 solder

Note: The plug may be fitted to a four pin socket during this procedure.

Retermination Procedure:

1. Unscrew plug backshell

2. Remove and discard earset wire (with heatshrink) from within the backshell.

The toothed metallic inner sleeve and rubber sleeve immediately inside the

toothed metallic sleeve should be kept for re-use.

3. Desolder and discard wire remnants from plug. Ensure all old solder and all

wire strands are removed from plug pins. Melt a small amount of fresh

solder into plug pins.

4. Prepare cable as follows:

Note: When removing outer insulation, care should be taken not to nick or

cut the internal wires.

a. Remove 10mm of the outer rubber sheath.

b. Twist outer copper shield back to outer rubber sheath and tin with

normal multi core solder.

c. Remove 7mm of outer teflon coating from each stainless steel inner

conductor. Twist both bared conductors together and tin with solder.

If these wires do not take the solder easily, tin with silver solder.

d. Trim inner conductor so that 2mm protrudes from the insulation, and

trim tinned copper shield to same total length.

5. Slide the following, in strict order, onto the earset cable:

a. Backshell;

b. Toothed metallic inner sleeve (with its rubber sheath); then

c. For Earset Speaker Off only: 10mm length of green 3.2mm heatshrink

d. 40mm length of 4.8mm black non-adhesive heatshrink, then 33mm

length of 4.8mm black non-adhesive heatshrink, then 25mm length of

4.8mm black non-adhesive heatshrink.

e. Solder the inner conductors to Pin C and the copper shield to Pin D.

Note: For Earset Speaker Off only a very short length of wire should be

soldered to Pins A and D.

6. Slide the 25mm length of black 4.8mm heatshrink down to (but not over) the

plug pins and heat to shrink. Repeat this procedure with the 33mm length of

4.8mm heatshrink and then with the 40mm length of 4.8mm heatshrink.

7. Slide the rubber sheath (with toothed inner sleeve) down the wire until the

teeth on the inner sleeve engage the teeth at the back of the plug. Do not

twist the rubber sheath/toothed inner sleeve over the heatshrink as damage

to the soldered wires will result. The rubber sheath may bind on the

heatshrink, to overcome this, moisten the heatshrink with a small amount of

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Minelab F1A4 Manuel de service Page 29

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