Minelab F1A4 Manuel utilisateur

F1A4 Metal Mine Detector

NSN 6665-66-142-9741

LEVEL 1 MAINTENANCE

LEVEL 2 MAINTENANCE

Date: 1

June, 2005

FIELD SERVICE MANUAL

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 2

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

WARNING

THIS DOCUMENT CONTAINS MINELAB ELECTRONICS

LIMITED RIGHTS TECHNICAL DATA OR RESTRICTED

RIGHTS DATA OR BOTH.

Minelab Electronics

This work is copyright. Apart from any use as

permitted under the Copyright Act 1968, no part

may be reproduced by any process without written

permission from Minelab Electronics

118 Hayward Avenue, Torrensville

South Australia.5031

CONTENTS

SECTION PAGE

1. Introduction ...................................................................................................................5

1.1 Levels of Maintenance ............................................................................................5

1.2 How to use this Manual...........................................................................................5

Level 1 Maintenance ..............................................................................................................6

2. Mechanical and Functional Testing of the F1A4 ................................................................7

2.1 Mechanical Testing .................................................................................................7

2.2 Functional Testing...................................................................................................8

3. Maintenance Procedures.................................................................................................11

3.1 Camlock Repair Procedures .................................................................................11

3.2 Replacing the Handle Assembly............................................................................14

3.3 Replacing the Handgrip.........................................................................................15

3.4 Replacing the Coil .................................................................................................15

Level 2 Maintenance ............................................................................................................16

4. Testing the F1A4 Control Box..........................................................................................17

4.1 Initial Power On Test.............................................................................................17

4.2 Sensitivity Test......................................................................................................17

4.3 Ground Balance Test ............................................................................................18

4.4 Coil Connector Test ..............................................................................................18

4.5 Noise Cancel test ..................................................................................................19

4.6 Audio Reset Test...................................................................................................19

4.7 Earset Test............................................................................................................19

5. Troubleshooting and Repair of the F1A4 Control Box ......................................................20

5.1 Troubleshooting the F1A4 Control Box..................................................................20

5.2 F1A4 Control Box and Earset Repair Procedures .................................................24

6. Reterminating the Coil Connector ....................................................................................33

7. F1A4 Control Box Internal Connection Details .................................................................34

7.1 PCB to Front Panel Connections – List .................................................................34

7.2 PCB to Rear Panel Connections – List..................................................................34

7.3 Plug/Socket/Component wiring – Illustration .........................................................35

7.4 PCB wiring – Illustration ........................................................................................36

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 5

1. INTRODUCTION

This manual is intended to instruct service technicians in functional testing

and Levels 1 and 2 maintenance of the F1A4 mine detector. All sub-assemblies of

the F1A4 can be replaced without the need for adjustment or calibration. This

service manual includes all Level 1 and Level 2 maintenance procedures, including

functional testing and troubleshooting.

1.1 LEVELS OF MAINTENANCE

Levels of maintenance for the F1A4 comprise:

Level 1:

Level 1 maintenance includes repair and/or replacement of all major

components of the detector. This level of maintenance can be conducted at

demining field sites or local depots if required. Level 1 maintenance includes full

functional testing of the detector and does not require any special test equipment or

facilities.

Level 2:

Level 2 maintenance encompasses Level 1 maintenance plus coil re-

termination and basic repairs to the F1A4 control box and earset. This level of

maintenance requires electronic workshop facilities.

Level 3:

Level 3 maintenance encompasses Level 1 and Level 2 maintenance,

plus control box printed circuit board repair. Level 3 repairs are only conducted at

Minelab's repair workshops located in Australia, Ireland and the USA.

1.2 HOW TO USE THIS MANUAL

This manual is divided into Level 1 and Level 2 maintenance sections. If

doubt exists as to the serviceability or mechanical integrity of the F1A4, turn to

Section 2 for a comprehensive mechanical and functional test of the F1A4. If any

mechanical component (eg handgrip, coil) of the F1A4 requires replacement, turn to

Level 1 maintenance procedures in Section 3, which details all mechanical repairs.

All repairs to the F1A4 Control Box, and Coil retermination procedures, are in the

Level 2 Maintenance Procedures, beginning at Section 4.

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 6

LEVEL 1 MAINTENANCE

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 7

2. MECHANICAL AND FUNCTIONAL TESTING OF THE F1A4

This section details mechanical and functional testing of the F1A4. Section

2.1 lists all mechanical testing and directs the user to applicable Level 1 repair

procedures if any defects are found. Section 2.2 lists functional testing of the F1A4

and will refer the user to the applicable fault finding procedure if a fault is found. A

defective component is confirmed using the substitution method, so a complete and

fully serviceable F1A4 should be on hand. After any repair to the F1A4, Section 2.2

Functional Testing, must be completed in full to ensure the F1A4 is returned for

operational use.

2.1 MECHANICAL TESTING

To conduct mechanical testing, unpack and fully assemble the F1A4 (As

described in the F1A4 Operations Manual). Ensure the armrest is fitted, control box

is mounted on the shaft and good batteries are used. During assembly:

1. Check that the coil yoke nut and bolt are firmly tightened and that the friction

washers are present and in good condition. The coil should be held firmly in

position (but moveable) on the yoke. If coil is loose on the yoke check the

nut, bolt and friction washers and replace as required.

2. Check that the skid plate is firmly attached, is not worn through or cracked.

Replace if required.

3. Check that the upper shaft slides smoothly over the lower shaft and when the

camlock is closed the upper shaft stays in position on the lower shaft. If

necessary, replace the camlock (Section 3.1).

4. Inspect the Armrest for cracks and other damage. Inspect the armstrap.

Check that the armrest slides fully into the upper shaft and is held firmly when

the upper camlock is closed. If necessary, replace the camlock (Section

3.1).

5. Check that the control box is firmly attached when the lock pin is fully rotated

to the stop. If necessary replace the handle (Section 3.2).

6. Inspect the handstrap and hand grip for wear, and replace if necessary

(Section 3.3).

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 8

2.2 FUNCTIONAL TESTING

This section details functional testing of the F1A4. It should be used to

confirm serviceability of an F1A4 before it is returned to the field for use and

whenever doubt exists about the serviceability of an F1A4. The F1A4 must pass all

these tests to be considered serviceable. Remedial action is included for repair if

required. If remedial action is completed (ie the F1A4 is repaired using these

procedures), the full functional test should be repeated from Section 2.2.1.

A Ground Balance (GB) Test Piece is required to properly test the F1A4.

This is needed to simulate mineralised or “noisy” ground and ensure correct F1A4

Ground Balance operation. The GB Test Piece can be a local piece of mineralised

ground (hot rock or a fired tile) that produces a response from the F1A4.

Procedure:

Ensure the coil connector ‘clicks’ in to the socket. If the coil

plug does not ‘click’ in, replace the coil plug washer, if the coil

plug still does not ‘click’ in, send the coil to an accredited F1A4

Level 2 maintenance workshop.

Note: The Coil must not be near any metal objects, and the technician must not wear

any rings, bracelets, or watches during this procedure.

2.2.1 Initial Power On Test

Switch the F1A4 on to the Search position. The detector should take six

seconds to run through the start up routine, comprising four rising tones followed by

a continuous background threshold tone. F1A4 target response is indicated by a

clear change in the threshold tone. The amount of change is dependent on the size

of the target (larger target – louder response) and the distance from the coil to the

target (closer to coil – louder response). If the correct tones or threshold are not

heard the faulty control box (or battery carrier) should be replaced or the F1A4

should be sent to an accredited F1A4 Level 2 maintenance workshop.

2.2.2 Sensitivity Testing

Hold the Test Piece Mine Detector in one hand, with the end containing the

target away from the Coil. Move the Test Piece Mine Detector towards the centre

of the coil until it lightly touches the centre of the coil and then move it sideways off

the coil (the Test Piece Mine Detector should be moved slowly and smoothly during

this procedure). A soft but distinct change in the threshold tone should be heard.

P0263-B

If a response is not heard replace the faulty Control Box (or Coil, see Section

3.4) or the F1A4 should be sent to an accredited F1A4 Level 2 maintenance

workshop for repair.

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 9

2.2.3 Ground Balance Testing

Note: The F1A4 Control Box will memorise its last Ground Balance settings when

switched off and then on again. If a Control Box/Coil combination has been

previously balanced to the GB Test Piece, on re-testing, a response to that hot rock

will not be heard again. The same Control Box/Coil combination must be re-

balanced with a GB Test Piece with different characteristics before re-testing. (If a

suitable GB Test Piece is not available, a piece of ferrite or local ground around the

workshop may suffice.)

While holding the Off/Search/Balance switch in the Balance

position, move the GB Test Piece up and down,

approximately 25 to 100 mm from the Coil.

Note: For the first five seconds when the Off/Search/Balance switch is switched to

the Balance position, the F1A4 will ground balance at a fast rate, after this time the

F1A4 will continue to balance but at a much slower rate. Consequently, if the F1A4

has not completely balanced out the GB Test Piece within five seconds, release the

Off/Search/Balance switch to the Search position and reselect the Balance

position.

The F1A4 should initially detect the GB Test Piece (a change of threshold

tone will be heard) as the GB Test Piece is moved to and from the Coil. The F1A4

will then become “balanced” to it, i.e. the F1A4 threshold will remain stable as the

GB Test Piece is moved to and from the Coil. To confirm that the F1A4 has

‘balanced’ correctly:

1. Release the Off/Search/Balance switch so that it returns to the Search

position.

2. Move the GB Test Piece as described above and confirm that there is no

further response from the F1A4.

3. If a response is still heard, check that there is no metal on the technician or

the GB Test Piece and repeat the test. If the F1A4 still responds to the GB

Test Piece, the faulty Control Box or Coil, (Section 3.4) should be replaced or

the F1A4 should be sent to an accredited F1A4 Level 2 maintenance

workshop for repair.

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 10

2.2.4 Coil Connector Test

Loop the coil cable and hold against side of the control box, approximately

250mm from the coil connector. Grasp the coil cable 75mm from the coil connector

and gently turn 30 degrees side to side, listening for a change of threshold. If there

is a noticeable threshold change (ie similar in volume to test piece threshold

change), the Coil should be replaced (Section 3.4) or the F1A4 should be sent to an

accredited F1A4 Level 2 maintenance workshop for repair.

2.2.5 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

If the correct tones are not heard the faulty Control Box should be replaced or

the F1A4 should be sent to an accredited F1A4 Level 2 maintenance workshop for

repair.

2.2.6 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). If the correct tones or threshold level are not heard the faulty Control

Box should be replaced or the F1A4 should be sent to an accredited F1A4 Level 2

maintenance workshop for repair.

2.2.7 Earset Test

1. Connect the Earset to the Control Box and ensure that the threshold tone is

audible at the earphone.

2. If a volume control is fitted, ensure that it operates correctly.

3. If the Earset does not operate correctly it should be replaced or the F1A4

should be sent to an accredited F1A4 Level 2 maintenance workshop for

repair.

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