Maintenance-2225 Service
Cabinet
I
WARNING
)
To avoid electric shock, disconnect tne
instrument from the ac-power-input source
before removing or replacing any component
or assembly.
To remove the instrument cabinet, perform the
following steps:
1.
Disconnect the power cord from the instrument.
For instruments with a power-cord securing
clamp, remove the Phillips-head screw holding
the power-cord securing clamp before dis-
connecting the power cord.
2.
Remove two screws from the rear panel (located
on each side) and remove it from the
instrument.
3.
Remove four screws, one from the left-rear side
and three from the right-rear side of the cabinet.
4.
Pull the front panel and attached chassis forward
and out of the cabinet.
5.
To reinstall the cabinet, perform the reverse of
the preceding steps. Ensure that the cabinet is
flush with the rear of the chassis and that the
cabinet and rear-panel holes are aligned with the
screw holes in the chassis frame.
6.
Reconnect the power cord.
Cathode-Ray
Tube
I
WARNING
The crt can be removed and reinstalled as follows:
1
1.
Unsolder the Trace Rotation wires
(J987)
from
the Front-Panel circuit board (note the connec-
tion locations and wire colors for reinstallation
reference).
I
WARNING
)
The crt anode lead and the High-Voltage Mul-
tiplier output lead retain a high-voltage charge
after the instrument is turned off. To avoid
electrical shock, disconnect the crt anode lead
from the High-Voltage Multiplier and ground
the lead to the main instrument chassis.
2.
Unplug the crt anode lead connector from the
I
High-Voltage Multiplier located on the inner
chassis. Discharge the anode lead to chassis
ground.
3.
Remove two front-panel screws that retain the
plastic crt frame and light filter to the front panel.
Remove the crt frame and light filter from the in-
strument.
4.
Remove the grounding spring from between the
top of the crt funnel and front chassis.
5.
With the rear of the instrument facing you, place
the fingers of both hands over the front edge of
I
the front subpanel. Then, using both thumbs,
press forward gently on the crt funnel near the
front of the crt. When the crt base pins disen-
gage from the socket, remove the crt and the crt
shield through the instrument front panel. Place
the crt in a safe place until it is reinstalled.
If
the
plastic crt corner pads fall out, save them for re-
installation.
NOTE
Use care when handling a crt. Breakage of the
crt may cause high-velocity scattering of glass
fragments (implosion). Protective clothing
and safety glasses should be worn. Avoid
striking the crt on any object which may cause
it to crack or implode. When storing a crt,
either place it in a protective carton or set it
face down on a smooth surface in a protected
location with a soft mat under the faceplate.
When installing the crt into the instrument, re-
install any loose plastic crt corner pads that
are out of place. Ensure all crt pins are straight
and that the indexing keys on the crt base,
socket, and shield are aligned. Ensure that the
ground clip makes contact only with the out-
side of the crt shield.
To reinstall the crt, perform the reverse of the pre-
ceding steps.
6-1
4
REV
APR
1990
Scans
by
ARTEK
MEDU
*
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