Field Replaceable Units
7450 ESS-7 Page 121
To remove a DC PEM:
Step 1 Turn off power at the appropriate remote source.
Step 2 Flip the circuit breaker (ON/OFF) on the PEM front panel to the OFF ( O ) position.
Step 3 Make sure the appropriate Power Supply LED on the SF/CPM is unlit.
Step 4 Remove the safety cover.
Step 5 Disconnect the VDC and RTN cables.
Step 6 Loosen the captive screws and slide the DC PEM out of the slot (Figure 38).
Step 7 If you do not replace the PEM immediately, install a blank panel to prevent excess dust
accumulation and to help control airflow and electromagnetic interference.
Table 37: DC PEM Features
Key Description
1 Circuit breaker (ON/OFF) flipped to OFF
2 Disconnected VDC and RTN cables and safety cover
3 Captive screw (2 per PEM)
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