Dc Operation - Replacing Fuses; Figure 3-12. Replacing Cdm-750 Dc Fuses - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Rear Panel Connections
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).
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).
•
Screw either fuse holder back into its receptacle.

Figure 3-12. Replacing CDM-750 DC Fuses

FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES WITH
THE CORRECT TYPE AND RATING.
3–19
Revision 2
MN-CDM750