Comtech EF Data CDM-750 - Manual (Page 65)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Rear Panel Connections MN-CDM750
3–19
3.3.3.2 DC Operation – Replacing Fuses
For DC operation the CDM‐750 requires two different fuses that are contained within the
individual screw‐in receptacles below the terminal block (located on the rear panel, Figure
3‐12).
Figure 3-12. Replacing CDM-750 DC Fuses
To replace the fuses, follow these steps (Figure 3‐12):
DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING!
• First, unscrew either fuse holder from its receptacle. Then, remove and replace the modem
and/or the BUC fuse(s):
o Use T3A (3 Amp) 250V fuses for modem operation (left‐hand receptable).
o Use T6.3A (6.3 Amp) 250V fuses when a Block Upconverter (BUC) is installed (right‐hand
receptacle).
FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES WITH
THE CORRECT TYPE AND RATING.
• Screw either fuse holder back into its receptacle.