Specifications

154 Chapter 12
Connecting the Instrument to a Handler with the Handler Interface
Modification of the Handler Interface
Procedure for removing the handler interface board
This section describes how to remove the handler interface board when setting the
drive/pull-up power supply or mounting the pull-up resistors.
WARNING Allow at least 10 minutes to elapse after disconnecting the power cable before
performing this work. While the 4287A is operating or immediately after the power is
turned off, dangerous electrical energy or voltage exists. Therefore, sufficient time is
required after disconnecting the power cable to discharge the internal capacitor.
NOTE While removing the cover, setting the drive/pull-up power supply, and mounting the
pull-up resistors, be sure to perform the work in an area with static protection and to wear a
ground strap.
Step 1. Disconnect power cable and wait for 10 minutes.
Step 2. Remove side straps from both sides of the 4287A.
Step 3. Turn the 4287A upside-down.
Step 4. Remove the eight screws and four feet from the bottom of the 4287A .
Step 5. Turn the 4287A rightside-up to its normal position.
Step 6. Remove the six screws (item 1 in Figure 12-7) and four standoffs (item 2 in Figure 12-7)
from the rear panel.
Figure 12-7 4287A Rear Panel
Step 7. Remove the two screws securing the A23 handler interface (item 3 in Figure 12-7) from the
rear panel.
Step 8. Slide the cover toward the back to remove it.