Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
141
NOTE!
and
as this procedure is performed.
1.
Remove the MCA assembly to a static-safe work surface as describe in the
“Removing the MCA
Assembly for Service”
procedure.
WARNING!
Damage to the MCA may result if the next step is not followed.
2.
Connect an approved grounding strap to your wrist. Attach the other end to a suitable ground.
3.
Locate the metal bracket that is under the Rectifier Shelf Interface circuit card. Loosen but do not
remove the four Phillips screws that secure the metal bracket. Remove the metal bracket with the
Rectifier Shelf Interface circuit card by sliding toward the rear of the MCA assembly until the screw
heads clear the slots in the bracket. Lift the bracket and circuit card from the MCA assembly, and set
aside.
4.
Remove the two (2) hex spacers that secure the FRONT of the MCA Main Controller circuit card.
5.
Loosen but do not remove the three (3) Phillips screws that secure a metal shield over the
Keypad/Display circuit card. Slide the shield to the side until the screw heads clear the keyhole slots.
Remove the metal shield.
6.
Remove the five (5) screws securing the Keypad/Display circuit card. Carefully slide the Keypad/Display
circuit card out of the MCA assembly until the ribbon cable connection on the circuit card is accessible.
7.
Locate the ribbon cable that extends from the MCA Main Controller circuit card to the MCA
Keypad/Display circuit card. Disconnect the cable plug from connector J1 on the Keypad/Display circuit
card.
8.
Connect the ribbon cable that extends from the MCA Main Controller circuit card to connector J1 on the
replacement Keypad/Display circuit card.
9.
Position the replacement MCA Keypad/Display circuit card on the MCA assembly. Secure by installing
the five (5) previously removed Phillips head screws.
10.
Reinstall the previously removed metal shield that covers the Keypad/Display circuit card. Secure by
tightening the three Phillip screws.
11.
Reinstall the two (2) hex spacers that secure the front of the MCA Main Controller circuit card.
12.
Reinstall the previously removed metal bracket and Rectifier Shelf Interface circuit card. To do so, place
the bracket on its four mounting posts so that the mounting screw heads pass through the slots in the
bracket. Slide the bracket toward the front of the MCA assembly. Tighten the four screws.
13.
STOP. If no other circuit cards in the MCA assembly are being replaced, continue with the
“Reinstalling
the MCA Assembly Following Service”
procedure found later in this section.
Reinstalling the MCA Assembly Following Service
DANGER!
Performing the next steps exposes service personnel to battery potential. Exercise extreme
caution not to inadvertently contact or have any tool inadvertently contact any energized electrical
termination.