Fluke 43B Service Manual

43B
Service Manual
6-6
6.2.6 Removing the Display Assembly
There are no serviceable parts in the display assembly. Referring to Figure 6-1, use the
following procedure to remove the display assembly.
1. Remove the main PCA unit (see Section 6.2.5).
2. The keypad pressure plate (item 9) is captivated by four plastic keeper tabs in the top
case. Press the plate down, carefully slide the plate to release it from the tabs, and
then remove it.
3. Remove the display assembly (item 6). To prevent finger contamination, wear
cotton gloves, or handle the display assembly by its edge.
After removing the display assembly, the shielding bracket (item 5) with the conductive
foam strip (item 4), the dust seal (item 3), and the shielding foil (item 2) can be removed.
6.2.7 Removing the Keypad and Keypad Foil
Referring to Figure 6-1, use the following procedure to remove the keypad and the
keypad foil.
1. Remove the display assembly (see Section 6.2.6).
2. Remove the keypad foil. Notice the four keypad foil positioning pins in the top case.
3. Remove the keypad.
Caution
To avoid contaminating the keypad contacts, and the keypad
foil contacts with oil from your fingers, do not touch the
contacts (or wear gloves). Contaminated contacts may not
cause immediate instrument failure in controlled environments.
Failures typically show up when contaminated units are
operated in humid areas.
6.3 Disassembling the Main PCA Unit
Referring to Figure 6-3, use the following procedure disassemble the main PCA unit.
1. Remove the M2.5 Torx screws (items 1 and 8) that secure the main shielding plate
(item 7) to the main PCA shielding box (item 5).
2. Pull the shielding plate away from the input banana jacks as you rotate the far end
upwards, and then remove it.
3. Remove the power input insulator (item 3), and the LED guide piece (item 6).
4. Remove the M2.5.Torx screws (item 2) that secure the PCA to the shielding box.
5. Lift the PCA at the screw end approximately 2 cm, and pull it away from the input
banana jack holes to remove it.
Note
Each input banana jacket is provided with a rubber sealing ring (Input 1,2
item 9, COM input item 10). Ensure that the rings are present when
reassembling the main PCA unit!

Fluke 43B Specifications

General

Category	Power Quality Analyzer
Interface	RS-232
Volts AC/DC	Yes
Ohms	Yes
Continuity	Yes
Diode Test	Yes
Capacitance	Yes
Harmonics Measurement	Up to 51st harmonic
Display	LCD
Battery Life	Approximately 6 hours
Weight	1.1 kg (2.4 lb)
Data Storage	Yes
Amps AC/DC	0.1 to 1000 A (with clamp)
Power Measurement	W, VA, VAR, PF
Dimensions	50 mm
Current Measurement Range	Via current clamp accessories (not built-in)