(c)
Use an ohmmeter to make sure the resistance is less than 10 megohms.
(d)
Connect the strap to an applicable electrostatic ground jack.
S 022-027
(3) Remove the unit with the ESDS placard from the equipment rack, the airframe, or the panel as shown in the applicable Removal/Installation procedure.
NOTE: Make sure you do not touch the pins in the electrical
____ connector. Make sure a static sensitive placard is installed adjacent to the electrical connector(s). This static sensitive placard, or an equivalent, will be shown:
CAUTION ELECTROSTATIC SENSITIVE DEVICE. CONDUCTIVE CONNECTOR DUST COVER REQUIRED.
This placard shows that the unit can be damaged by an electrostatic discharge through the connector pins.
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S 032-028
(4) Install a conductive dust cover with a static sensitive placard on the connectors, and standard dust covers on the connectors that do not have the placard.
NOTE: The conductive dust caps and the connector covers are black
____
in color.
NOTE: The conductive dust caps and the connector covers from the
____ installed unit can be used on the removed unit.
S 862-029
(5)
Move the unit, as shown in the standard practices, with the conductive dust caps and connector covers installed.
S 022-054
(6)
Remove the strap.
TASK 20-40-12-402-030
5. ESDS Metal Encased Unit Installation
____________________________________
A. General
(1) This task provides instructions to install an ESDS metal encased unit.
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.
(2)
Obey this CAUTION during all of this task.
B.
Equipment
(1)
Ohmmeter - Resistance Measuring Bridge
(commercially available)
(2)
Strap (or alternative tool)
(a)
2214 Strap - Adjustable Wrist, Conductive, "CHARGE GUARD" with 5' coiled cord (recommended)
Minnesota Minning and Mfg. Co. (Vendor code 57707) 3M Austin Center, Austin TX 78769-2963
(b)
9070 Strap - Wrist, Grounded, Adjustable with 6' coil ground cord (alternative)
Desco Industries Inc. (Vendor code 62576), 761 Penarth Ave., Walnut, CA 91789-3028
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737-300/400/500MAINTENANCE MANUAL
(3) Conductive electrical dust caps and connector covers
NOTE: Conductive dust caps and connector covers are black or grey
____
in color.
(4) Anti-static dust caps and connector covers (alternate when
conductive caps and covers not available)
(a) Plastic dust caps and connector covers that have an anti-static solution applied and are dated.
C. Install the Metal Encased Units with ESDS Placards
S 862-031
(1) Remove the system electrical power with the applicable procedure.
S 762-057
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 resistance test of the strap:
(a) Use an ohmmeter to make sure the strap assembly has minimum resistance of 250 kilohms and a maximum of 1.5 megohms.
CAUTION: THE GROUNDING LEAD ON THE WRIST STRAP MUST TOUCH THE SKIN
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