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Section V – Maintenance and Servicing
Front Panel 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, from the power supply board.
At the front panel, disconnect the 10-pin power cable, J1, the 3-pin rear panel, J4, and meter, J5,
connections from the front panel board as well as the 10-pin Isolated Analog Subsystem connector,
J2, from the front panel board.
5.
Using a hex key, loosen the set screws holding the three front panel knobs on their respective
shafts and remove the knobs. Additionally, the range control is secured to the front panel by a hex
nut and flat washer that must be removed. An internal tooth lock washer is located on the range
control bushing.
6.
With the front panel board completely disconnected from the balance of the instrument, remove
the two screws that fasten the base plate to the front panel.
7.
Remove the captivating screws, lock washers from the mounting studs, and remove the front panel
board from the front panel.
8.
Installation of a front panel board is performed by reversing the order of the above removal steps.
Isolated Analog 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 from the power supply board.
5.
Disconnect the 10-pin cable coming from the Isolated Analog Subsystem to the front panel, J2.
6.
Disconnect the 10-pin cable coming from the power supply board to the front panel board, J1.
7.
Remove the two screws that fasten the base plate to the front panel.
8.
Tip the front panel forward sufficiently to expose the rear of the three front panel binding posts,
unsolder the HI and LO input terminal connections (NOTE: These connections are made with high-
quality silver solder to minimize input thermal EMF) and disconnect the Isolated Analog Subsystem
from the GUARD binding post.
9.
To remove the Isolated Analog Subsystem as a unit, place the instrument on its side and remove
the 8 nylon bolts that connect the Isolated Analog Subsystem to the instrument base plate.
CAUTION: The Isolated Analog Subsystem in its metal box is very heavy. Assistance in the disassembly
process helps reduce the potential of damage from dropping components during the
disassembly/assembly process.
10.
Remove the metal box containing the analog subsystem together with its connection cables and
insulating plate from the case.
11.
If access to the internal Isolated Analog Subsystem board is required, remove the top cover,
retaining screws and top cover. Next remove the captivating screws and lock washers from the 4
mounting studs to free the Isolated Analog Subsystem board. If the board is being replaced, the
inter-connect cables must also be removed for reinstallation on the replacement board.
12.
Installation of the isolated analog subsystem and/or the analog subsystem board is performed by
reversing the order of the above removal steps. Be sure to use silver solder to re-connect the
Isolated Analog Subsystem input cable to the input binding posts.
