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5700A/5720A Series II Calibrator
Service Manual
4-10
Reverse this procedure when changing from rear to front output operation.
1. Remove instrument top and bottom covers and remove bottom analog guard cover.
2. Remove the instrument front panel by removing the three hex screws on each front
handle side and a single screw on the top of the front panel. See Figure 4-4 for screw
locations. By grasping the handles gently pull the front panel away from the frame
and lay it on its handles in front of the instrument.
3. Remove all the wires connecting the ring terminals of the output cable to the front
panel binding posts. Save all hardware removed during this step.
4. Remove the two screws and restraining board attaching the toroid to the Front Panel.
Save these items.
5. Position the output cable and toroid along the bottom left side of the instrument. In a
later step, the output cable will be positioned between the Analog Motherboard and
the left side panel.
6. Install the Front Panel.
7. Detach the Rear Panel by removing six hex screws (three on each rear handle side)
and two screws near the the fan filter on the Rear Panel. See Figure 4-2 for screw
locations. Then grasp the handles and gently pull the Rear Panel away from the
frame.
8. Orient the instrument so that it is resting on its right side panel, with its bottom
facing you.
9. Route the output cable between the left side panel and the Analog Motherboard,
ending at the Rear Panel.
10. Using the items obtained during toroid removal, attach the toroid to the two rear
panel standoffs.
11. Attach the color-coded output leads to the rear output binding posts. Use one washer
on each side of each connecting ring. Verify connections by checking the decal
mounted nearby or by matching lead color to the color on the front of the binding
post. (Of the eleven wires, four are clear-insulated shield wires. If necessary, refer to
page 4 of the Analog Motherboard schematic in Section 8 to determine these
connections.)
CAUTION
Do not over tighten hardware on the binding posts. Torque in
excess of seven inch-pounds can damage a binding post.
Note that the I GUARD terminal is not connected at the front binding posts; cut
away the I GUARD thermal fit covering to connect this terminal at the rear binding
posts. Also, the AUX CURRENT ring terminal is not connected at the rear binding
posts; this terminal must be insulated and tied off.
12. Replace the rear panel back, the bottom guard cover, and top and bottom covers to
complete this procedure.