10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com
5-1
Section V – Maintenance and Servicing
Maintenance
No regular maintenance is required, other than to keep the internal battery charged. Calibration
Verification should be performed yearly or as required.
The exterior of the Model AVM-2000 should be cleaned periodically, as is necessary, using a soft cloth
dampened with a mild non-abrasive, water soluble, detergent, and then rinsed with a water dampened
soft cloth. DO NOT use alcohol, solvents, harsh chemicals, or abrasive materials to clean the AVM-2000
Meter, or other plastic knobs and connectors.
Clean the AVM-2000 Meter exterior face using a soft cloth dampened with a mild non-abrasive, water
soluble, detergent, and then rinse with a water dampened soft cloth. Wipe dry with another soft cloth. DO
NOT use common paper towel products in place of a soft cloth, as some brands may contain fibers which
could scratch the AVM-2000 Meter. DO NOT use alcohol, solvents, harsh chemicals, or abrasive materials
to clean the AVM-2000 Meter.
Periodically inspect the AVM-2000 to make sure all the switch and control knobs are on tight. If they are
loose, tighten with the proper size Allen wrench or a small flat blade screw driver as appropriate.
Disassembly and Re-Assembly
Make sure the AC Power Module (or any other source of charging current) is disconnected and removed
from the AVM-2000 before any disassembly or reassembly of the instrument. The reader should become
familiar with drawings, parts identification, parts layout and other mechanical information.
CAUTION: The battery must be disconnected as the first step in any disassembly process.
CAUTION: Follow ESD (ELECTROSTATIC DISCHARGE) Procedures when handling the AVM-2000 printed
circuit boards and their components
.
POWER SUPPLY SUBSYSTEM
1.
Make sure the POWER switch is in the OFF (out) position.
2.
Disconnect the AC Power Module (or other charging source) from the AVM-2000.
3.
Remove the 8 screws (left and right sides of the instrument case) that attach the top cover to the
front and rear panels. Slide the top cover vertically from the instrument.
4.
With the top cover removed, disconnect the 3-pin battery cable J3, 10-pin power cable J4, and, the
3-pin ISOLATED OUTPUT interconnect cable, J1, from the power supply board to facilitate access.
5.
With the battery and power supply board completely disconnected from the balance of the
instrument, remove the two screws that fasten the base plate to the rear panel.
6.
With the back panel free from the case, unsolder the charging jack pins, the ISOLATED OUTPUT
binding posts and the fuse wires from the power supply board.
7.
Remove the power transistor cable J2.
8.
Remove the captivating nuts, lock washers from the mounting studs, and remove the power supply
board from the back panel.
9.
If the power transistor is to be replaced, remove the transistor by first removing the retaining nut
from the mounting stud. Clean any residual heat sink compound from the back panel with
denatured alcohol and reapply fresh compound prior to the installation of the new transistor. Be
sure a new isolating shoulder washer is placed over the stud and
centered in the power transistor’s
mounting hole before the nut is tightened
.
CAUTION: Many connectors are similar in appearance. When re-assembling the instrument, be sure
connector and jack numbers match and those connectors are installed correctly.
