Fluke Car Amplifier 5220A User Manual

Instruction Manual

4-4

4-7. Internal 

Components/Assemblies

All internal switches, fuses, and calibration adjustments can be accessed by removing the
top cover and the large inner cover from the 5220A. The location of each of the
applicable components is shown in Figure 4-1. Procedures for setting, replacing, and/or
adjusting these components are given later in this section of the manual.

4-8. 

Front Panel Removal

There are no electrical components physically mounted on the front panel of the 5220A.
Use the following procedure to remove the front panel:

1.

 

Remove the top and bottom covers from the 5220A.

2.

 

Stand the instrument on its rear handles. Use a solid work surface.

3.

 

Locate the two tabs at the rear of each front handle and remove the tab screws (4
total).

4.

 

Lift the front panel from the chassis.

4-9. 

A9 Front Panel PCB Removal

Use the following procedure to access and remove the A9 Front Panel PCB Assembly:

1.

 

Remove the front panel.

2.

 

Remove the two screws from the top of the A9 Front Panel PCB Assembly.

3.

 

Pull the PCB from its connector (J10).

4-10.  A2 Transformer Assembly Removal

Use the following procedure to remove the A2 Transformer Assembly from the 5220A:

1.

 

Remove the top cover from the 5220A.

2.

 

Remove the large inner cover.

3.

 

Locate and remove the two screws that hold the A2 Transformer Assembly to the
chassis side.

4.

 

Remove the two screws that hold the A2 Transformer Assembly to the Motherboard.
These screws are located on the bottom right-side of the transformer assembly (as
viewed from the top rear of the 5220A).

5.

 

Remove the two hex screws that hold the top front of the transformer assembly to the
5220A front bulkhead.

6.

 

Disconnect the three high-current transformer leads at the A3 Cap Bus Assembly.
Lug nuts hold the leads in place.

7.

 

Carefully lift the A2 Transformer Assembly from the 5220A.