Fluke 45 - 3-19. Remove the IEEE-488 Option; 3-20. Remove the Main PCA; 3-21. Remove the Analog Measurement Processor Shields

General Maintenance
Disassembly Procedures
3
3-9
Caution
Avoid using ammonia or methyl-alcohol cleaning agents on
either the Front Panel of 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.
3-19. Remove the IEEE-488 Option
Chapter 8 of this manual provides a detailed removal procedure for the IEEE-488 option.
The following removal instructions provide the essentials of this procedure. If necessary,
refer to the complete procedure in Chapter 8, paying particular attention to Figures 8-2
and 8-3.
1. Use needle nose pliers to disconnect the 24-line cable assembly at the IEEE-488
PCA. Alternately pull on each end of the cable connector.
2. Remove the panhead Phillips screw at the rear of the IEEE-488 PCA.
3. Use needle nose pliers to detach the two ribbon cables at the front of the IEEE-488
PCA. Alternately pull on each end of the cable connector. Do not remove these
cables at their Main PCA connections.
Note
The IEEE-488 ribbon cables are not interchangeable with the Display
Assembly ribbon cable. Connectors on these cables are aligned
differently, allowing for proper cable routing.
4. Remove the IEEE-488 PCA, disengaging the board from both the small slot in the
side of the meter chassis and the plastic standoff at the front corner of the board.
3-20. Remove the Main PCA
With the IEEE-488 option and the Display Assembly removed, the Main PCA can be
removed with the following procedure:
1. Remove the power switch activator rod ("E" in Figure 3-5) from the bottom of the
Main PCA.
2. Detach the transformer connector (right rear corner of the Main PCA, "F" in Figure
3-5) and the RS-232 connector (center of the Main PCA, "G" in Figure 3-5.) If the
Battery Option is installed, detach its connector at the center-rear of the Main PCA.
3. Now remove the securing screw (near the battery connector, "H" in Figure 3-5), and
slide the Main PCA forward. Match the pca edge indentations to the guide tabs on
each chassis side, then lift the Main PCA up and away from the chassis.
To remove the transformer insulator (center rear of the Main PCA, "I" in Figure 3-5),
detach the two tabs and pull up.
3-21. Remove the Analog Measurement Processor Shields
The Analog Measurement Processor resides within a plastic shield on the top of the
Main PCA. Although having the appearance of a dark gray piece of plastic, this shield is
electrically conductive; treat it as you would any other conducting surface. On the
bottom of the Main PCA, the Analog Measurement Processor is protected with a
metallic shield. Access the Analog Measurement Processor with the following
procedure: