Test Products International 460 - Manual (Page 43)

Appendix B
Maintenance
This chapter covers basic maintenance for the hand-held TPI Scope Plus 460. These procedures
include general inspection, use and inspection of probes, and battery check and replacement.
Note that attempts to perform maintenance beyond the scope of this document, especially alter-
ations to interior settings, may result in a default of your warranty coverage.
General Inspection
The following steps are recommended, but the sequence is not critical. If all steps are per-
formed, and the instrument is malfunctioning, note the conditions on a label and attach it to the
instrument. Prepare the unit for mailing in to the address given at the front of this document, but
please call the service department before shipment.
1. Check the exterior of the instrument for damage and existence and functionality of the
carrying handle and back support flap.
2. Check the back of the instrument for any loose or missing screws, and any obvious
interior rattles. Note: Do not shake the instrument vigorously. A gentle rocking is
sufficient to check for loose parts.
3. Check the display face plate for nicks and scratches that could cause interference with
viewing waveforms.
4. Check the plug sockets at the top of the instrument for discoloration or burns, etc.
5. Check the key markings and silk screening above the display (Ch A / COM / Ch B), for
readability.
6. Connect the power adapter to the 460, and allow 10-minutes for the circuitry to stabilize.
Then press USER > CONTRAST and use the arrow keys and sun icon button to adjust for
optimal brightness and contrast. If the brightness and/or contrast are slightly out, the
internal battery may be undercharged. If the unit has been in service for a long time and
the display is very dim, you may need to replace the battery (see instructions on battery
checks and replacement later in this chapter).
Probes
The 460 comes with one set of probes and can be used with a number of other probes available
as optional extras. Most of the probes come with their own specifications and instructions, so
only general maintenance information will be included here. Please note the following points.
B-1
460 User s Guide Maintenance