Fluke NetDAQ 2640A, Service Manual

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General Maintenance
Disassembly Procedures
3
3-11
Disassembling the Front Panel Assembly 3-13.
Complete the following procedure to disassemble the Front Panel Assembly [D].
1. Place the Front Panel Assembly on a protective surface to prevent any scratching or
damage to the assembly.
2. Release the tabs at the sides and top that hold the A2 Display PCA [F] on the back of
the Front Panel Assembly; then lift the pca out of its securing slots.
NOTE
The Display PCA provides space for securing screws, which are
used only if one or more tabs are broken. If the pca has one or more
securing screws, remove these as well.
3. To remove the elastomeric keypad [G], grasp the keypad and with a gentle motion
pull the keypad free of the assembly.
4. To remove the display window [H], release the two snaps along the bottom edge and
push the window free of the assembly.
CAUTION
Avoid using ammonia or methyl-alcohol cleaning agents
on either the Front Panel or the display window. These
types of cleaners can damage surface features and
markings. Use an isopropyl-based cleaning agent or
water to clean the Front Panel and the display window.
Removing the A1 Main PCA 3-14.
Complete the following procedure to remove the A1 Main PCA [I] from the chassis.
1. Complete the procedure “Removing the Instrument Case” to gain access to the
instrument assemblies. Verify the instrument is not powered from any ac or dc
source.
2. Using a needle-nose pliers or nonmetallic prying device, gently disconnect the
display ribbon cable [E] from the connector A1J2.
3. Disconnect the pendant A/D ribbon cable [J] at the A3 A/D Converter PCA
connector A3J10 and gently pull the cable and connector through the chassis
opening.
4. Disconnect the transformer cable at A1J3 [K].
5. Using a needle-nose pliers or nonmetallic prying device, remove the two terminals
with red wires from the instrument power switch [L] and gently pull the wires and
terminals through the pca opening. (At the power switch, you may find it necessary
to remove the power input terminals to gain access to the red wires. Note the color
and routing of the power input terminals for the reconnection procedure.)
6. Remove the two screws [M] that secure the pca to the chassis.
7. Remove the RS-232 connector hardware [N] using a 3/16-inch nut driver.
8. Slide the pca towards the front of the instrument so that the pca edge indentations
match the guide tabs on each side of the chassis, tilt slightly upwards and remove.