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+24 VDC Power System User Manual (Section 6013)
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Rev. G
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d)
Lift the MCA Interface Option Assembly away from the MCA assembly.
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.
Remove the five screws and two hex spacers securing the MCA Main Controller circuit card to the MCA
assembly. Remove the circuit card.
9.
Position the replacement MCA Main Controller circuit card over its mounting position, as shown in
. Secure by installing and tightening the five screws and two hex spacers previously removed.
10.
If an MCA Interface Option Assembly (modem, combination modem/RS-232, or RS-485) was installed,
reinstall as follows:
a)
Position the MCA Interface Option Assembly over the MCA assembly so that the mounting stud on
the MCA assembly passes through the keyhole in the MCA Interface Option Assembly mounting
bracket.
b)
Slide the MCA Interface Option Assembly toward the front of the MCA assembly until connector and
plug mate. Ensure that the mounting engages the keyhole slot in the mounting bracket.
c)
Reinstall the one Phillips head screw that secures the MCA Interface Option Assembly mounting
bracket.
d)
For the Combination Modem/RS-232 Interface Assembly only: Reconnect the ribbon cable that
extends from the front panel-mounted RS-232 connector to its mating connector on the MCA
Interface Option Assembly.
11.
Position the MCA Power Supply circuit card over its mounting position, as shown in
. Secure
by installing and tightening the two Phillips head screws (front) and two hex spacers (rear) previously
removed.
12.
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.
13.
Reconnect the ribbon cable that extends from the MCA Main Controller circuit card to connector J1 on
the MCA Keypad/Display circuit card.
14.
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.
15.
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 Keypad/Display Circuit Card Assembly Replacement Procedure
NOTE!
A No. 2 Phillips screwdriver having a minimum shaft length of 10 inches is required for this
procedure. If such a screwdriver is not available, you should remove the MCA Main Controller circuit
card as describe under “MCA Main Controller Circuit Card Assembly Replacement Procedure” before
removing the MCA Keypad/Display circuit card.