(b)  
Put the wrist strap on your wrist.

 (c)  
Use an ohmmeter to make sure the resistance is less than 10 megohm.

 S 492-016
 (3)  Connect the wrist strap into the ELECTROSTATIC GROUND JACK of the card file.
 S 492-037
 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 862-048
 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.
 (5)  
Open the access door on the card file.

 S 862-019

 (6)  
From the location decal, find the printed circuit board to be installed.

 S 422-039

 (7)  
Remove the ESDS printed circuit board from the conductive bag or the carrier.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-40-12
 ALL  ú ú 01 Page 205 ú Nov 15/96
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737-300/400/500MAINTENANCE MANUAL
 S 422-021
 (8)  
With the top and bottom (or left and right) extractors, put the printed circuit board into the card file.

 S 432-022

 (9)  
Attach the printed circuit card with the extractors.

 S 412-040

 (10)
 Close the access door for the card file.

 S 092-041

 (11)
 Disconnect the wrist strap from the ELECTROSTATIC GROUND JACK.

 TASK 20-40-12-002-025
 4.  ESDS Metal Encased Unit Removal_______________________________
 A. General
 (1)  
This task provides instructions to remove an ESDS metal encased unit.

 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 Mining and Mfg. Co. (Vendor code 57707), 3M 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.
 (3)  
Conductive dust caps and connector covers must be installed on the connectors of ESDS units when the units are removed.

 (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 they are dated.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 C. Remove the Metal Encased Units with the ESDS Placards
 S 862-050
 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 procedure.
 S 762-052
 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 a minimum resistance of 250 kilohms and a maximum of 1.5 megohms.
 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 METAL ENCASED UNIT.
　
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