Fluke 45 - 3-22. Remove the Rms PCA; 3-23. Remove the Battery Option; 3-24. Disconnect Miscellaneous Chassis Components; 3-25. Assembly Procedures

45
Service Manual
3-10
• Working from the bottom of the Main PCA, remove the single Phillips head screw
("J" in Figure 3-6) securing the metallic shield, then lift the plastic shield ("M")
away from the top of the Main PCA.
• If necessary, remove the metallic shield ("K".) Avoid contacting any circuit traces
during this procedure. First rotate the shield toward the pca edge, then pry the shield
free from its nylon standoff ("L").
3-22. Remove the Rms PCA
The rms pca is soldered in place on the Main PCA (within the Analog Measurement
Processor shield.) For access procedures, refer to "Remove the Analog Measurement
Processor Shields". Use standard desoldering techniques (e.g. solder sucker or solder
wick) when removing this assembly.
3-23. Remove the Battery Option
Use the following procedure to remove the Battery Option. Refer to Figures 7-2 and 7-3
(Chapter 7) to identify features and techniques mentioned here. If necessary, refer to
Chapter 7 for a detailed description of Battery Option removal.
1. Disconnect the flat white battery option connecting cable at the Battery Option PCA.
2. Remove the two #6-32 x 1/4" panhead Phillips screws securing the Battery Option.
3. Carefully slide the Battery Option out of the meter. Do not pinch the wires running
from the pca to the battery terminals.
3-24. Disconnect Miscellaneous Chassis Components
The following procedures can be used to disconnect remaining hardware from the
chassis:
1. Use needle nose pliers to remove the internal connections at the line power plug.
2. Remove the power plug by releasing its two snaps, one at a time.
3. Disconnect the power transformer by removing the four screws ("N" in Figure 3-5)
that secure it to the right side of the chassis.
4. Remove the RS-232 connector ("O") on the rear of the chassis. Use a 3/16-inch nut
driver to loosen the connector securing hardware. Also, disconnect the ground wire
at its chassis connection.
5. Remove the IEEE connector.
3-25. Assembly Procedures
Generally, assembly procedures follow a reverse sequence of disassembly procedures.
As some differences do apply, assembly is described separately in the following
paragraphs. Begin assembly at the appropriate level, as defined by the heading.
References are made to items in Figure 3-5 for assembly details of standard meter parts.
3-26. Install Miscellaneous Chassis Components
Use the following procedure to replace any items that have been removed from the basic
chassis.
1. Install the IEEE connector on the rear of the chassis.