General Maintenance Information; Handling Precautions For Static-Sensitive Devices; Disassembly - Fluke 27 Service Manual

3-7. General Maintenance Information

3-8.

Handling Precautions for Static-Sensitive Devices

This unit contains CMOS components which can be damaged
by static discharge. Static-sensitive components include U1
(the custom analog IC), U2 (the microcomputer), and op amp
AR1. To prevent static discharge damage, take the following
precautions when servicing the instrument.
•
Perform all work at a static-free work station.
•
Do not handle components or pca (printed circuit assembly) by their connectors.
•
Wear static ground straps.
•
Use conductive foam to store components.
•
Remove all plastic, vinyl, and Styrofoam from the work area.
•
Use a grounded, temperature-regulated soldering iron.
3-9.

Disassembly

To avoid the possibility of electric shock, remove the test leads
prior to disassembly.
Opening the instrument case in damp, humid environments
followed by moving the instrument to a cooler environment
could cause condensation inside the case. Instrument
performance may be adversely affected by condensation.
To avoid contaminating the pcas with oil from the hands (or O-
ring lubricant), handle the pcas by the edges or wear gloves. If
a pca does become contaminated, refer to the cleaning
instructions given later in this chapter. Do not allow the LCD to
come in contact with moisture.
Disassembly requires a number 2 Pozidriv
screws and a number 1 Phillips-head screwdriver for all interior screws.
Reassembly requires silicone lubricant (Parker Super O-Lube is
recommended) and new seals. A Fluke seal kit (Model 8025 A-7401, Fluke
Part Number 738112) provides a complete set of seals and four
replacement screws and washers for the bottom case. A 2 oz tube of Parker
Super O-Lube can be obtained from the Fluke Corporation by ordering p/n
812230.
Caution
XWWarning
WCaution
WCaution
Note
®
screwdriver for all exterior
Maintenance

General Maintenance Information

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