To replace the CRT, reverse the removal procedure. Make
certain the faceplate of the CRT seats properly against the
front panel. It may be necessary to loosen the two side
screws at the side of the tube clamp and realign the tube
base. Tighten the bottom clamp screw approximately 4
to 7 inch-pounds.
After the tube and assembly have been replaced, adjust
the high voltage, high voltage current and trace rotation.
The procedure is given in the Calibration section.
Removing the TIME/DIV Switch Assembly
The horizontal display board may either be removed before
removing the switch assembly, or it can remain mounted. If
the board is not removed, disconnect the necessary pin
connectors to the board so the assembly can be removed.
1. Remove the VARIABLE and TIME/DIV control knobs,
plus the mounting nuts and washers.
2. Disconnect the lead from capacitor C701, at pin C of
the pin connector. Snap the nylon mounting bracket for
the capacitor C701 off the switch struts. See Fig. 4-13A.
3. Loosen the two screws (Fig. 4-13B) through the two
nylon supports that hold the switch strut to the main frame.
These nylon supports are just forward of the switch wafer
section. Twist the nylon support studs off the switch struts.
4-9
