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D ISMANT
L
I MG THE INSTRUMENT
3 .
3.1.
GENERAL INFORMATION
WARNING:
The opening of covers or removal of parts, except those of which access can be gained by hand,
is likely to expose live parts, and also accessible terminals may be live.
The instrument shall be disconnected from all voltage sources before any adjustment, replace-
ment or maintenance and repair during which the instrument will be opened.
If afterwards any adjustment, maintenance or repair of the opened instrument under voltage is
inevitable,
Bear in mind that capacitors inside the instrument may still be charged even if the instrument
has been separated from all voltage sources.
ATTE NTl ON
This section provides the dismantling procedures required for the removal of components during repair ope-
rations. All circuit boards removed from the oscilloscope should be adequately protected against damage, and
all normal precautions regarding the use of tools must be observed. During dismantling procedures,
note must be made of all disconnected leads that they may be reconnected to their correct terminals during
.
Damage may result if the instrument is switched on when
board i s removed within one minute after switching off the instrument.
3 . 2 .
REMOVING THE INSTRUMENT COVERS
The instrument is protected
handle, and a rear panel.
To facilitate the removal of the instrument cover and rear panel, first ensure that the front cover is in position.
Then proceed as follows:
- Hinge the carrying handle clear
- Stand the instrument on i t s protective front cover on a flat surface.
- Slacken the two coin-slot screws located on the rear panel.
-
Lift the rear panel a t the right-hand side. slit it a l i t t l e to the right and take it off.
- Remove the four screws fixing the cast-aluminium profile.
-
Remove the cast-aluminium profile.
- Remove the instrument cover by lifting it clear of the instrument.
NOTE: Bend out the cover at the side of the rubber feet so that the feet do not catch behind the frame parts.
ACCESS TO ADJUSTING ELEMENTS
3 . 3 .
All instrument adjustment points are accessible after removing the instrument cover, the screening plate of the
time-base (secured by two star-screws) and the screening plate of the attenuator (secured by six star-screws).
The correct adjustment of the channel A and B attenuator sections is not disturbed if the screening plate is
remounted.
Five adjustment points on the power supply (Unit 6) are accessible via holes in the right-hand chassis plate
of the instrument.
NOTE: Always use an insulated adjustment tool.
shall b e carried out
only
by
it
by
three covers: a front-panel protection cover, an instrument cover with carrying
of
the front cover by pushing both pivot centre buttons simultaneously.
qualified person who i s aware of
a
circuit board has been removed, or if
a
3-
1
hazard involved.
t h e
careful
a
circuit
a
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