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+24 VDC Power System User Manual (Section 6013)
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Rev. G
139
5.
Remove the two Phillips head screws and two hex spacers that secure the MCA Power Supply circuit
card to the MCA Main Controller circuit card. Remove the Power Supply circuit card.
6.
Position the replacement MCA Power Supply circuit card over its mounting position. Secure by
installing and tightening the two Phillips head screws (front) and two hex spacers (rear) previously
removed.
7.
Connect the ribbon cable permanently connected to the MCA Power Supply circuit card to connector
J2 on the rear edge of the MCA Main Controller circuit card.
8.
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.
9.
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.
MCA Main Controller Circuit Card Assembly Replacement Procedure
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.
, and 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 ribbon cable permanently connected to the MCA Power Supply circuit card from connector
J2 on the rear edge of the MCA Main Controller circuit card.
5.
, and remove the two Phillips head screws and two hex spacers that secure the MCA
Power Supply circuit card to the MCA Main Controller circuit card. Remove the Power Supply circuit
card, and set aside.
6.
If an MCA Interface Option Assembly (modem, combination modem/RS-232, or RS-485) is present,
remove as follows:
a)
, and remove the one Phillips head screw that secures the MCA Interface Option
Assembly mounting bracket.
b)
Slide the MCA Interface Option Assembly toward the rear of the MCA assembly until connector and
plug separate and the mounting stud clears the keyhole slot in the mounting bracket.
c)
For the Combination Modem/RS-232 Interface Assembly only: A ribbon cable extends from the
assembly to a front panel-mounted RS-232 connector. Disconnect this cable from the Interface
Assembly.
