Reassembly - Fluke 27 Service Manual

27
Service Manual
17. Remove the four lower Phillips-head screws (H5) that secure the digital pca to the
18. Carefully lift the digital pca straight up from the top case and remove it.
19. Lift the momentary switch (S3-S6) from the top case. Remove the elastomeric LCD
20. Remove the LCD (U3) and the LCD mask (MP19) from the case.
21. To disassemble the main pca/shield assembly, first remove the two Philllips-head
22. Turn the assembly over and remove the three thread-forming, Phillips-head screws
23. Lay the bottom shield aside, and separate the top shield from the pca.
24. At this point, all main pca components are accessible.

3-10. Reassembly

Reassembly requires a number 2 Pozidriv
screws, a number 1 Phillips-head screwdriver for all internal screws,
silicone lubricant (Parker Super-O-Lube is recommended), and new seals.
A Fluke seal kit (Model 8025A-7401, Fluke Part Number 738112)
provides a complete set of seals and four replacement screw and washers
for the bottom case. A 2-oz tub of Parker Super-O-Lube can be obtained
from the Fluke Corporation by ordering p/n 812230.
Reassembling the instrument is primarily a reversal of the disassembly procedure.
However, some precautions are necessary to ensure proper sealing and to maintain
water-tight integrity. Use the following procedure to reassemble the instrument:
Do not touch the elastomeric LCD contact strips (MP20) or
contacts of the momentary switch (S3-S6) with bare hands.
Wear gloves or remove the contact strips using clean pliers or
tweezers. Avoid contaminating the contact strips.
1. Position the LCD mask (MP19) in the top case (MP1), then place the LCD (U3) in
3-10
top case using a diagonal pattern (i.e., remove the upper-right screw, then the lower-
left, then the upper-left, and last the lower-right). Then remove the two Phillips-head
screws (H2) at the top of the digital pca, above the connector.
Do not touch the elastomeric LCD contact strips (MP20) or
contacts of the momentary switch (S3-S6) with bare hands.
Wear gloves or remove the contact strips using clean pliers or
tweezers. Avoid contaminating the contact strips.
contact strips (MP20) and LCD interconnect support (MP18), located on the back of
the LCD.
screws (H8) from the top shield (MP9). Take care not to lose the flat washers under
the screw heads.
(H4) that secure the bottom shield (MP3).
the LCD mask with the Fluke part number toward the top of the instrument, pressing
the LCD lightly to engage the spring action of the LCD mask. Place the LCD
interconnect support (MP18) over the LCD, then place the elastomeric connector
strips (MP20) at the top and bottom of the LCD interconnect support with the black
connection strip against the LCD.
Caution
Note
®
screwdriver for all external
Caution