I f f i l l 1 1 1
Rackmount/Benchtop Versions—492/492P Service Vol. 1 (SN B030000 & up)
TO ADJUST ALIGNMENT:
1. Position the instrument with the pivot
screws approximately even with the front rails.
2. Loosen the mounting screws at the front of
both stationary sections (left side shown). \
3. Allow the tracks to seek their normal posi
tions with the instrument centered in the rack.
4. Tighten the mounting screws.
5. Push the instrument all the way into the
rack. If tracks do not slide smoothly, check for
correct spacing between the rear supports.
6. Check the vertical positioning of the 492
front panel with respect to adjacent instru
ments or panels. If not correct, reposition as
necessary.
Fig. 6-7. Alignment adjustment for correct operation.
8. Reinstall the support brace across the bottom of the
cabinet, then reinstall the bottom panel.
9. Reinstall the instrument in the rack and install the
semi-rigid cables between the front-panel connectors and
the connectors on the cabinet grill.
a. Ensure that the plugs and receptacles are clean
and free of any foreign matter.
b. Insert the plug connectors fully into the receptacle.
The length of the cables is almost the same so do not
force a cable in place if it does not fit.
c. Screw the nut on finger tight to ensure it is not
cross-threaded.
d. Use a 5/16 inch open-end wrench to tighten the nut
to 8 to 10 inch pounds torque.
PREPARING THE INSTRUMENT FOR
CALIBRATION OR MAINTENANCE
Before the 492/492P instrument can be removed from
the rackmount/benchtop cabinet, the fan must be removed.
After the instrument is removed from the cabinet the fan
must be reconnected before power can be applied and the
instrument turned on.
Prepare the instrument for maintenance as follows:
1) if the instrument is rackmounted and has the semi-rigid
cables to the back panel (Option 31), disconnect the instru
ment semi-rigid cables between the 492/492P front panel
and the connectors on the front grill of the cabinet;
2) disconnect all external connections to the instrument, in
cluding the power cord, and remove the rackmounted
492/492P;
3) place the rackmount/benchtop instrument on its face;
4) loosen the two fan assembly mounting screws and re
move the fan assembly;
5) use a 5/32-inch Allen wrench to loosen and remove the
four screws that hold the instrument to the cabinet back
panel;
6) carefully align the fan assembly power connector pins to
the receptacle on the back panel of the instrument and
reinstall the fan assembly. Reconnect the power cord;
7) the instrument is now ready for calibration or repair.
REV JUN 1982
6-9
To Next Page
