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9.1 Removing the Circuit Card Assembly
Remove the circuit card assembly only when doing the following procedures.
1.
Changing an analog output from CAT to VAT type, or from VAT to CAT.
2.
Terminating or unterminating an instrument in a serial communications link.
3.
Changing numbers of Discrete Inputs/Discrete Output combinations on the open collector output cards.
Avoid opening the instrument unless absolutely necessary. Damage to the instrument can result unless
proper procedures are followed.
ATTENTION
!
•
Contact your service representative before attempting service. Unauthorized repairs of an instrument
may void the warranty.
•
Before removing the chassis assembly, be sure to take proper safeguards against electrostatic
discharge, such as wearing an approved grounding strap.
ATTENTION
Time-stamp and description of successful calibrations are stored to disk in the Event File.
Circuit Card Removal and Replacment Procedures (VPR100 & VRX100)
Step
1
Open the front display assembly by pressing the button underneath the bezel to release the latch
and then pulling the bezel forward and up. Press the bottom edge of the bezel as you press the
button and the latch will release easily.
2
Lift the front bezel up and out until it locks in the open position.
3
With your palm face up, insert 2 fingers into the 2 loops of the bottom bail linkage. (Some
instruments have a single loop.) See Figure 9-1.
4
With your free hand, one at a time push each latch toward the center of the instrument while gently
pulling with the other hand on the bail linkage. You may have to gently jiggle and pull on the bail
linkage to help release the latches.
5
Once the latches are free of the sub-bezel, pull on the bail linkage to slide the circuit card assembly
out of the instrument.
6
The sub-chassis will strike a stop when it is almost all the way out. Lift the back end of the card cage
to clear the stop and the entire assembly can be removed. There are no cables which need to be
disconnected.
12/00
9. On-Site Adjustments
Table 9-1 Circuit Card Removal Procedure (VPR100 & VRX100)
VPR & VRX – User Manual
Action
On-Site Adjustments
263
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