Removal And Replacement Of - HP 54501A Service Manual

6-22. Removal and Replacement of CRT Monitor Assembly
1 .
It is necessary to remove System Board Assembly from instrument in order to
remove hardware securing CRT to instrument cabinet . Refer to Removal and
Replacement of System Board Assembly, if necessary .
2.
Connect a jumper lead between ground lug of CRT and shaft of a screwdriver .
To discharge CRT, place screwdriver under protective rubber cap of post ac-
celerator lead and momentarily touch screwdriver to metal clip of post ac-
celerator lead .
Discharge the post accerc_ ator lead to a grounding lug only . Components
will be damaged if the post accelerator is discharged to other areas.
NOTE
The CRT may charge up by itself even while disconnected. Discharge the
CRT before handling by shorting the post accelerator terminal of the CRT to
the ground lug with a jumper lead.
3. Disconnect post accelerator lead from CRT by firmly squeezing rubber cap until metal clip
disengages from CRT .
4. Detach intensity cable, W7, from sweep board .
5.
Detach sweep cable, W6, from sweep board and CRT Monitor Assembly cables from CRT
and sweep board.
6. Slide sweep board up and out of cabinet slot.
NOTE
When installing sweep board, it may be necessary to press on center of the
outer shield of sweep board to allow the board to clear cabinet support rib.
7.
Carefully place instrument in front-panel-down position .
8.
Remove the three 7mm nuts securing CRT to front panel ..
9.
Remove the #15 TORX® screw securing CRT to front panel .
10. Remove CRT and ground bracket from front panel of instrument.
HP 54501A SERVICE