Appendix C: User Service

CAUTION

A 2% RMA flux content solder is recommended for making repairs in this instrument. Cleaning of rosin residue is not recommended. Most cleaning solvents tend to reactivate the rosin and spread it under components where it may cause corrosion under humid conditions. The rosin residue, if left alone, does not exhibit these corrosive properties.

Replacing the CRT Filter

A smoke-gray filter is installed over the face of the CRT. The filter part number is given on page 1-7. If the filter becomes damaged, it can be replaced in the following manner:

1.Remove the five knobs below the CRT.

2.Insert a small, straight-blade screwdriver into the re- cessed area on either the right or left side of the panel. Pry gently until the panel snaps out of the front-panel frame. See Figure C-1 for panel and recess location.

3.Remove the two Torx screws that fasten the bezel to the instrument.

4.Grasping the bottom of the bezel, pull out and upward to remove the bezel from the instrument. (There are two hinges at the top of the bezel that hold it in place; once the bezel is at an approximate 45° angle with the front panel, they will disengage.)

5.Remove the damaged filter and snap the new filter into place on the back side of the bezel. Position the ridged side of the filter towards the CRT to eliminate unwanted visual effects on the CRT face.

1740A/1750A Series Waveform/Vector Monitor User Manual

C-5