314 Disassembly Procedures

The following paragraphs describe disassembly of the Fluke 45 in sequence (from the fully assembled meter to the chassis level.) Start and end your disassembly at the appropriate heading levels.

3-15. Remove the Meter Case

Use the following procedure to remove the meter case.

1. Make sure the meter is turned off and unplugged from the power outlet.

2. Discharge the power supply capacitor by turning on the meter (with the meter unplugged from the power line). After five seconds, turn the meter off.

3. Remove the screw from the bottom of the case, and remove the two screws from the rear bezel as shown in Figure 3-3 section A. While holding the front panel, slide the case and rear bezel off the chassis. (See Figure 3-3 section B.) (At this point, the rear bezel is not secured to the case.)

Caution

If the Main PCA is to be serviced and the Battery Option is installed, first unplug the battery ribbon cable from the Main PCA, or disconnect the wires to the battery. This measure prevents damage to the meter when you are servicing the Fluke 45 Main PCA.

Figure 3-3. Removing the Case

3-16. Remove Handle and Mounting Brackets

Refer to Figure 3-4 during this procedure. Pull each handle pivot out slightly at the handle mounting brackets, then rotate the handle up over the display. With the handle pointing straight up, pull out and disengage one pivot at a time.

Use a Phillips head screwdriver to remove the two handle mounting brackets. Note that these brackets must be reinstalled in their original positions. Therefore, the inside of each bracket is labeled with an "R" or an "L", referenced to the front view of the meter.

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Figure 3-4. Removing the Handle and Handle Mounting Brackets qb15c.eps

Figure 3-4. Removing the Handle and Handle Mounting Brackets

3-17. Remove the Front Panel Assembly

Remove all leads connected to the input terminals. Then remove the front panel 100 mA fuse. Using needle nose pliers, disconnect the wires at the rear of the Vfi^^ , [COM], and [10 A] input terminals. At the rear of the [100 mA] terminal, carefully dislodge and withdraw the spring (attached to the white wire) from the fuse holder.

Locate the display ribbon cable connector on the Main PCA ("A" in Figure 3-5.) Using needle nose pliers, disconnect this cable by alternately pulling up on each end of its connector. Avoid breaking the alignment tabs on the Main PCA half of this connection.

Now remove the Front Panel Assembly by releasing the four snap retainers ("B" in Figure 3-5) securing it to the chassis.

3-18. Remove the Display PCA

The Display PCA is held in place with a set of tabs around its periphery. In sequence, release the tabs along the top, left side, and right side. Then slide the pca up and out, away from the bottom tabs.

Note

The Display PCA provides a space for a center securing screw. If the peripheral tabs are intact, this screw is not necessary. If some of the tabs are broken, the screw can be used as an additional securing device.

The elastomeric Keypad Assembly ("C" on Figure 3-5) can now be lifted away from the Front Panel Assembly.

Remove the display window ("D" on Figure 3-5) by releasing the two snaps along its inside, bottom edge. Use a gentle levering action between each snap and an adjacent edge on the Display Assembly.

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