IBM THINKPAD T42 -, Руководство по обслуживанию

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Removal and Replacement of the -48 V DC Circuit Breaker
This section covers the removal and replacement procedure for the -48 V dc circuit breaker.
CAUTION:
Energy hazard, remove power before servicing. Disconnect two power supply cords.
C23
Removal
This section covers the removal procedures for the -48 V dc circuit breaker.
1. Follow the steps in the “Power-Off Procedure with the DC Power Distribution Panel” on page 29.
2. Have the customer turn off the dc power source that connects to the dc power distribution panel.
3. After the customer’s -48 V dc source power is turned off, ensure that a tag or label is positioned over
the power source switches to indicate that the power is intended to be off (lock-out/tag-out).
4. Remove the six mounting screws from the top cover of the power distribution panel, and then remove
the top cover.
5. Remove the -48 V dc bus shield (insulation).
6. Remove the bezel from the front of the dc power distribution panel.
1
2
9
5
8
3
4
6
7
1 Mounting Screws 6 Front Bezel
2 Top Cover 7 Bezel Mounting Screws
3 Bus Bar Shield (Insulation) 8 Circuit Breaker Switches
4 Terminal Block (Both Sides of the
Rear Cover)
9 Circuit Breaker Position Labels
5 Covers for Empty Circuit Breaker
Positions
36
7014 Model T00, and Model T42 Service Guide