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Model 585 Time Scaling Processor
viii
Fusing Information
WARNING: To reduce the risk of fire, replace fuses only with the same type
and rating.
The unit uses a universal switching power supply that handles the full range of nominal
mains voltages between 90 and 264 VAC and any frequency between 50 and 60 Hz.
Check Main Fuse
The Main fuse rating is:
T 1A L (1 Amp, 250 V, 20 mm, time-lag, low-breaking capacity) for all operating
voltages.
WARNING: The power to the unit must be off when the following steps are
performed. Ensure that the main power cable to the unit is not connected to a
power source.
1. Open the fuse compartment door in the AC power input housing with a small flat-
blade screwdriver (Figure 1). Carefully pull out the fuse carrier.
2.
Check that the fuse has the correct rating. The fuse carrier must be inserted into
the compartment with the orientation shown in Figure 1.
Do not force the carrier
into the compartment or both could be damaged.
3.
Snap the fuse compartment door closed.
Fuse carrier
Installed fuse
Open the door
Figure 1 Checking the Main Fuse
Internal Fuse
The switching power supply contains a separate fuse. Most fault conditions should be
protected by the main fuse.
If you find it necessary to replace the internal fuse, be certain to replace it with a fuse
of the same type and rating as printed on the switching power supply board.