Equipment replacement Page 25 of 34
QCA144 1.5 MB/S RPE Cabinet
Maintenance and equipment replacement
Procedure 11
Power Distribution Cable replacement
1
Set the CAB INP breaker on the QUX19 unit to OFF.
2
Perform this step only if EMI shields are equipped.
—
Remove screws securing bottom shield and remove shield.
—
Tag and disconnect cables from connectors at rear of the first PE
shelf. Remove EMI shield.
—
Tag and disconnect cables from connectors A, B, C, D, E, and F
at rear of PE shelf on second tier. Remove EMI shield.
—
If power cable being replaced is connected to the third tier, tag
and disconnect cables from connectors A, B, C, D, E, and F of
third tier. Remove EMI shield.
3
Perform this step only if the power cable serving the first tier is being
replaced.
—
Disconnect connector P3 from the rear of the QUAA3 unit.
—
Disconnect red and blue wires from terminals 2 and 3 of TB5 at
the rear of the QUX20 unit.
—
Disconnect the black and white wires from the distribution cable
to the GRD2 and GRD1 connections on the ground bus at the rear
of the cabinet.
—
Disconnect connectors PE2 and PE3 from the PE shelf
backplane.
—
Connect connectors PE2 and PE3 of the replacement distribution
cable to the PE shelf backplane J connectors and connector P3
and J3 at the rear of the QUAA3 unit.
—
Connect the white and black wires equipped with ring connectors
to GRD1 and GRD2 terminals on the ground bus.
—
Connect the red and blue wires to terminals 2 and 3 of TB5 at the
rear of the QUX20 unit.
CAUTION
Service in the cabinet is interrupted when replacing a power
distribution cable.
