Tektronix 371B, Service Manual

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Maintenance
371B Service Manual
4-21
9. Remove the CRT frame by removing the four remaining screws located on
the outer corners of the CRT frame.
10. Pull the graticule illumination lamp assemblies from the sides of the CRT
faceplate.
11. Hold one hand on the CRT faceplate and gently pull out the CRT while
pushing on the base of the CRT.
CRT Installation.
Perform the following to install the CRT.
1. Check to ensure that each guide slot contains a CRT retainer at each corner
of the front panel CRT opening.
2. Check the CRT base pins for proper alignment. Align as necessary to ensure
that the base socket can be easily installed once the CRT is placed in the
CRT shield.
3. Inset the CRT into the front panel opening and set its base into the CRT
clamp ring located at the rear of the CRT shield.
4. Clean the CRT faceplate and place the A28 and A29 lamp board assemblies
on the right and left side of the CRT, respectively. Place the lamp retainer
springs between the lamp boards and the chassis.
5. Fasten the CRT frame to the chassis by installing the four screws located on
the outer corners of the CRT frame.
6. Install and tighten to 5 kg/cm (4.3 in/lb) the four screws located on the inner
corners of the CRT.
7. Tighten the two CRT base clamp screws until the springs on the screws are
fully compressed.
8. Install the CRT base-pin socked on the CRT base pins.
9. Install the CRT implosion shield, spacer, and filter.
10. Install the CRT bezel and bezel cover.
11. Reconnect the CRT anode cap.
12. If you installed a replacement CRT, perform the adjustment procedures
provided in Chapter 5: Performance Check and Adjustment.
13. Install the right side, rear, and top panels.