Teledyne 3350 - Microprocessor based control room monitor for personnel safety - Manual (Page 33)

5-1
Alarm Oxygen Monitor Maintenance 5
Teledyne Analytical Instruments
Maintenance
Aside from normal cleaning, the Model 3350 should not require any
maintenance beyond replacement of expended Micro-Fuel Cells, and perhaps a
blown fuse. Routine maintenance includes occasional recalibration, as described
in chapter 4, Operation.
5.1 Replacing the Fuses
Remove Power to Unit before replacing any fuse.
The Model 3350 has two different configurations: Standard AC Version
and AC with Battery Backup Version. Both configurations have replaceable
fuses. When a fuse blows, check first to determine the cause, then replace the
fuse(s) using the following procedures, depending on which version is used.
5.1.1 Standard AC Version
When a fuse blows, check first to determine the cause, then replace the
fuse using the following procedure:
1. Disconnect the AC power and place the power switch located on
the rear panel of the control unit in the O position. Remove the
control unit power cord from the receptacle.
2. The fuse receptacle is located in the power cord receptacle
assembly in the upper left-hand corner of the control unit, on the
front door. See Figure 5-1.
Figure 5-1: AC Fuse Replacement
FUSE