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7800 MultiFrame Manual
7800FR 3 Rack Unit Frame
5.
SERVICING INSTRUCTIONS
CAUTION – These servicing instructions are for use by qualified service
personnel only. To reduce risk of electric shock do not perform any servicing
instructions in this section of the manual unless you are qualified to do so.
5.1.
CHANGING THE FUSES
Check that the line fuse is rated for the correct value marked on the rear panel.
Never replace with a fuse of greater value.
5.1.1. AC Powered Frames
The fuse holder is located inside the power entry module. To change the fuses, pull out the fuse holder
from the power entry module using a small screwdriver. The fuse holder contains two fuses, one for the
line and one for the neutral side of the mains connection. Pull out the blown fuse and place a fuse of the
correct value in its place. The correct fuse rating is marked on the rear panel near the power entry
module.
Fuse Rating: 6.3 amps, 250 Volt ceramic time delay, 5 x 20 mm
For your convenience there are spare fuses located in the vinyl pouch in the front of this manual.
Carefully reinsert the fuse holder into the power entry module.
5.1.2. DC Powered Frames
The fuse holder is located near the terminal strip. To change the fuses, remove power from the frame.
Insert a flat blade screwdriver in the fuse holder and turn to clockwise. Pull out the fuse from the fuse
holder using a small screwdriver. Remove the blown fuse and replace with a fuse of the correct value.
The correct fuse rating is marked on the rear panel. Carefully reinsert the fuse into the fuse holder.
Tighten by turning the fuse holder counter clockwise.
Fuse Rating: 12 amps, 250 Volt ceramic time delay, 5 x 20 mm
For your convenience there are spare fuses located in the vinyl pouch in the front of this manual.
5.2.
REPLACING THE POWER SUPPLY
Each power supply is a complete assembly and includes the power supply cooling fan and one frame
cooling fan. In the event that the power supply or one of the fans malfunction, you will need to replace the
power supply assembly with a spare one while the failed assembly is being repaired.
7800FR - 12
Revision 1.3
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