Disassembly
3-5
CAUTION
The regulator clip allows the chassis
to serve as a heat sink for R101 and
Q528. To prevent damage to these de-
vices (due to overheating), do not fail
to install the clip when re-assem-
bling the Model 2001.
8. Unfasten Analog Board
The analog board is se-
cured to the chassis at the rear panel by the two
BNC connectors (External Trigger and Meter Com-
plete). At the rear panel, remove the nuts and lock
washers for the BNC connectors.
9. Remove Analog Board
The board is held in
place by edge guides on each side of the chassis.
Slide the analog board forward until the board
edges clear the guides, and then carefully lift the
board out of the chassis. The bottom shield on the
analog board can be removed by simply pulling it
off the board.
NOTE
With the analog board removed, the
cooling fan can removed as explained
in paragraph 3.7.
3.6 Front panel disassembly
Use the following disassembly procedure to remove
the display board and/or the pushbutton switch pad.
Drawing 2001-052 shows how the front panel separates
from the chassis, and drawing 2001-040 shows an ex-
ploded view of the front panel assembly.
NOTE
Before performing the following pro-
cedure to remove and disassemble the
front panel, remove the case cover as
explained in paragraph 3.4.1.
Perform the following steps to remove and disassem-
ble the front panel:
1. Unplug Display Cable
Turn the chassis upside-
down and unplug the display cable from the digi-
tal board at connector J1033.
2. Remove Front Panel Assembly
The front panel
assembly has four retaining clips that snap onto
the chassis over four pem nut studs. Two retaining
clips are located on each side of the front panel.
Pull the retaining clips outward and, at the same
time, pull the front panel assembly forward until it
separates from the chassis.
3. Remove Display Board
The display board is
held in place by a pc board stop. This is simply a
plastic bar that runs along the bottom edge of the
display board. Using a thin bladed screw driver,
pry the plastic bar upward until it separates from
the casing of the front panel. Pull the display board
out of the front panel.
4. Remove Switch Pad
The conductive rubber
switch pad simply pulls out of the front panel.
3.7 Cooling fan removal
The cooling fan, which is mounted to the rear panel of
the chassis (see drawing 2001-060), does not need to be
removed in order to clean the Þlter. To clean the Þlter,
refer to paragraph 1.4. If, however, the fan needs to be
removed, perform the following procedure.
NOTE
In order to remove the cooling fan, the
case cover must be removed (see para-
graph 3.4.1) and the analog board
must be removed (see paragraph
3.5.3).
1. Disconnect Fan Cable
Turn the chassis upside-
down and unplug the fan cable from connector
J1037. This two conductor cable connection is lo-
cated at the rear of the digital board in front of the
IEEE connector. Return the chassis to the right-
side-up position.
2. Remove Mounting Nuts
The fan is secured to
the chassis by two mounting nuts. Remove these
nuts and pull the fan out of the chassis.
3.8 Main CPU firmware replacement
Changing the Þrmware may be necessary as upgrades
become available. The Þrmware revision level for the
main CPU is displayed during the power-on sequence.
The Þrmware for the main CPU is located in EPROM
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