Standard Parts - Fluke PM3082 Service Manual

8 - 2
8.2.1

Standard parts

Electrical and mechanical replacement parts can be obtained through your local FLUKE organization
or representative. However, many of the standard electronic components can be obtained from other
local suppliers. Before purchasing or ordering replacement parts, check the parts list for value,
tolerance, rating and description.
NOTE: Physical size and shape of a componenent may affect the instrument's performance,
particularly at high frequencies. Always use direct-replacement components, unless it is
known that a substitute will not degrade the instrument's performance.
8.2.2 Special parts
In addition to the standard electronic components, some special components are used:
- Components, manufactured or selected by Fluke to meet specific performance requirements.
- Components which are important for the safety of the instrument.
ATTENTION: Both type of components may only be replaced by components obtained through your
local FLUKE organization of representative.
8.2.3 Transistors and Integrated Circuits
- Return transistors and IC's to their original positions, if removed during routine maintenance.
- Do not replace or switch semi-conductor devices unnecessarily, as it may affect the calibration of
the instrument.
- Any replacement component should be of the original type or a direct replacement. Bend the leads
to fit the socket or p.c.b. holes and cut the leads to the same length as on the component being
replaced. See also the Performance Test in this manual.
- When a device has been replaced, check the operation of the part of the instrument that may be
affected.
8.3 STATIC SENSITIVE COMPONENTS
In the oscilloscope the black/yellow 'static sensitive
components' symbol is present (see also figure 8.1). This
means that this instrument contains electrical components
that can be damaged by electrostatical discharge.
Although all MOS integrated circuits incorporate protection
against electrostatic discharge, they nevertheless can be
damaged by accidental over-voltages.
It is also possible that a delayed failure or 'wounding' effect may occur. When this happens the
component will fail anywhere between two hours to six months later.
In storing and handling static sensitive components, the normal precautions for these devices are
recommended. Handling and servicing static sensitive assemblies and components should be
performed only at a static free workstation by qualified personnel.
CAUTION: Testing, handling and mounting call for special attention. Personnel, handling
static sensitive devices, should normally be connected to ground via a high-
ohmic resistor.
Extensive information on how to deal with static sensitive components is contained in Support Bulletin
OSC296 (ordering number 4822 872 08407).
CORRECTIVE MAINTENANCE PROCEDURES
Figure 8.14 Static sensitive symbol
(black/yellow)