4 Attention: Errors can occur if you disconnect both back-power card cables whilethe 7133 is running. Never disconnect both back-power card cables unless the jobyou are doing needs you to do so (for example, the removal of a backplaneassembly).Disconnect the cable 8 or 7 for the back-power card that you are removing.5 Pull out the relevant back-power card 5 or 6.6 Replace parts in the reverse order. Ensure that you push the power cards fullyhome.3-42 7133 Service Guide