(b)
Put the wrist strap on your wrist.
(c)
Use an ohmmeter to make sure the resistance is less than 10 megohm.
S 422-033
(3) Connect the wrist strap into the ELECTROSTATIC GROUND JACK of the card file.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-41-01
ALL ú ú 01 Page 204 ú Jan 20/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 862-005
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.
S 012-006
(5)
Open the access door on the card file.
S 032-007
(6)
From the location decal, find the printed circuit board to be removed.
S 022-008
(7)
Use the top and bottom (or left and right) extractors on the printed circuit board to remove it from the card file.
S 862-010
(8)
Put the printed circuit board in the conductive bag or the container with the ESDS placard.
S 862-009
CAUTION: DO NOT USE STAPLES OR ADHESIVE TAPES TO CLOSE THE CONDUCTIVE
_______ BAGS. FAILURE TO CLOSE THE CONDUCTIVE BAGS CORRECTLY CAN CAUSE DAMAGE TO THE PRINTED CIRCUIT BOARD.
(9) Use an ESDS or a 100% cotton twine to close the conductive bag.
NOTE: The printed circuit boards in a conductive bag must be put in
____ a rigid container to make sure the conductive bag stays in a satisfactory condition.
S 862-011
(10)
Close the access door to the card file.
(11)
Disconnect the wrist strap from the ELECTROSTATIC GROUND JACK.
S 862-012
TASK 20-41-01-402-013
3. ESDS Printed Circuit Boards Installation
________________________________________
A. Equipment
(1) Conductive Bags - 3M type 2100
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-41-01
ALL ú ú 01 Page 205 ú Jan 20/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(2)
Conductive Plastic Carrier - Electrical
Insulation Suppliers PCC-700
(3)
Ohmmeter
(4)
Wrist Straps - 3M 2066 or 2067
(a) A wrist strap is kept on the plenum of the racks E3 and E4 in the main equipment center (Fig. 202).
(5)
100% Cotton Twine - Commercially Available
(6)
ESDS Labels
(a)
JEDEC International Label - multi-source
(b)
3M - No. 7102
B. Install the Printed Circuit Boards with a STATIC SENSITIVE Placard
S 862-040
CAUTION: MAKE SURE YOU KEEP CONTAMINATION OR UNWANTED MATERIAL AWAY FROM
_______ THE SENSITIVE DEVICE. CONTAMINATION OR UNWANTED MATERIAL NEAR THE SENSITIVE DEVICE CAN CAUSE A MALFUNCTION IN THE SENSITIVE DEVICE.
(1) Remove the system electrical power with the applicable
Removal/Installation procedure.
S 862-044
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 422-034
(3) Connect the wrist strap into the ELECTROSTATIC GROUND JACK of the card file.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 STANDARD PRACTICES - AIRFRAME(151)
