S 722-057
WARNING: USE A WRIST STRAP WITH A MINIMUM GROUNDING LEAD RESISTANCE OF
_______ 250 KILOHMS AND A MAXIMUM OF 1.5 MEGOHMS. USE OF A LOW RESISTANCE WRIST STRAP CAN CAUSE INJURY TO PERSONS IF A HIGH VOLTAGE SOURCE IS TOUCHED.
(2) Do these steps to do a test of the wrist strap resistance:
(a)
Use an ohmmeter to make sure the wrist strap assembly has a minimum resistance of 250 kilohms and a maximum of 1.5 megohms.
(b)
Put the wrist strap on your wrist.
(c)
Use an ohmmeter to make sure the resistance is less than 10 megohm.
S 422-062
(3) Connect the wrist strap into the ELECTROSTATIC GROUND JACK of the card file.
S 862-016
CAUTION: THE GROUNDING LEAD ON THE WRIST STRAP MUST TOUCH THE
_______ SKIN TO GIVE THE PROTECTION THAT IS NECESSARY. FAILURE TO USE THE WRIST STRAP CORRECTLY CAN CAUSE DAMAGE TO THE ESDS PRINTED CIRCUIT BOARDS.
(4)
Attach the wrist strap correctly on the person that will remove the printed circuit board.
(5)
Open the access door on the card file.
S 862-018
(6)
From the location decal, find the printed circuit board to be installed.
S 862-019
(7)
Remove the ESDS printed circuit board from the conductive bag or the carrier.
S 862-017
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
S 422-020
(8)
With the top and bottom (or left and right) extractors, put the printed circuit board into the card file.
S 432-021
(9)
Attach the printed circuit card with the extractors.
S 862-022
(10)
Close the access door for the card file.
S 862-023
(11)
Remove the wrist strap.
TASK 20-41-02-002-024
4. ESDS Metal Encased Units - Removal Handling___________________________________________
A. General
(1)
The metal encased units can be put on a rack, the airplane structure, or a control panel.
B.
Equipment
(1)
Wrist Strap - Conductive, (commercially available)
(2)
Ohmmeter
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
(3) Conductive electrical dust caps and connector
covers
NOTE: Conductive dust caps and connector
____ covers are black or grey in color.
(a)
ITT Cannon - as applicable (stamped "CONDUCTIVE") ~............................................... | PART NUMBER | MARKING ON CAP | CONNECTOR | ................................................. | 025-1155-001 | BKAD1-A&B-R | BKAD1-A-R | | | | BKAD1-B-R | ................................................. | 025-1156-001 | BKAD1-C-R | BKAD1-C-R | ................................................. | 025-1157-001 | BKAD2&3-A&B-R | BKAD2-A-R | | | | BKAD2-B-R | | | | BKAD3-A-R | | | | BKAD3-B-R | ................................................. | 025-1158-001 | BKAD2&3-C-R | BKAD2-C-R | | | | BKAD3-C-R | 2...............….................….............1
(b)
Souriau - as applicable ~................................................ | PART NUMBER | TYPE CONNECTOR | SHELL SIZE | .................................................. | 8660-1404 | Power | 1 | .................................................. | 8660-1405 | Signal | 1 | .................................................. | 8660-1406 | Power | 2 & 3 | .................................................. | 8660-1407 | Signal | 2 & 3 | 2..............…..................…..............1
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