HP 54501A - Removal and Replacement of

6-22 . Removal and Replacement
of
CRT
Monitor
Assembly
1
.

It is necessary
to removeSystem 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 upby 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