Tektronix DPO3000 Series, Service Manual

Page: 45 / 79

Maintenance
Rear Case Follow these steps to remove the rear case assembly. Use a TORX T15 screwdriver
tip. (See Figure 5-1 on page 5-5.)
1. Place the oscilloscope face down on the work surface.
2. Remove the four T15 screws from the back of the rear case assembly. When
reinstalling the rear case torque these screws to 8.0 in/lb.
3. Grasp the case and pull outwards to remove it.
Rear Chassis Follow these steps to remove the rear chassis assembly. You will need a
5
/
8
in.
wrench, a
3
/
16
in. nutdriver, a
5
/
16
in. wrench, and a TORX T15 screwdriver tip.
(See Figure 5-1 on page 5-5.)
1. Remove the
5
/
8
in. nut from the Aux Out BNC. When reinstalling torque
this nut to 25 in/lb.
2. Remove the two
3
/
8
in. jackscrews from the WVGA Video connector. When
reinstalling torque these to 4.0 in/lb.
3. Remove the two T15 screws attaching the power connector. When reinstalling
torque these screws to 8.0 in/lb.
4. Remove the 12 T15 screws attaching the rear chassis to the front chassis.
When reinstalling torque these screws to 8.0 in/lb.
5. Lift the rear chassis from the oscilloscope, and unplug the fan power cable
from the I/O board. When reinstalling the rear chassis there are several steps
to follow:
a. Make sure the captured nuts are still in place, in the black plastic bracket
that holds the IEC power connector.
b. Make sure the connectors from the I/O board line up with their respective
holes in the rear chassis.
c. Make sure the two guide pins on the power connector line up with their
positioning holes.
d. Thread the fan power cable through the hole in the rear chassis closest to
the fan, so that it goes to the outside of the rear chassis.
e. After the rear chassis is reattached to the front chassis, use a spudger or a
pair of needle-nose pliers to insert the fan power connector back through
the hole and onto J200 on the I/O board. (See Figure 4-2.)
f. Push the rest of the fan power cable into the hole, so that the entire cable
is inside the Rear Chassis. (See Figure 4-2.)
MSO3000 and DPO3000 Series Digital Phosphor Oscilloscopes Service Manual 4–7