4. Maintenance
A. Power Requirements
The PTC8001 operates on 4 AA alkaline batteries
or optional rechargeable Ni-Cd batteries. To
replace the alkaline batteries or to install
rechargeable batteries remove the two (2) screws
on the rear battery door and lift the battery cover.
When using Ni-Cd batteries the AC adapter will
simultaneously power the PTC8001 and charge
the batteries. A full charge will take 10-12 hours.
The AC adapter can be used to power the unit
on the bench with or without Ni-Cd batteries
installed. Never connect the AC adapter with
alkaline batteries installed, be sure to remove
the alkaline batteries before using the AC
adapter.
B. Field Replacement Fuse Update
PTC8001 comes with a field replaceable mini-
fuse. This fuse protects the 8001 from mis-
connections beyond the ratings specified for
the 8001 inputs and outputs. If an overload
condition occurs and a blown fuse is suspected
perform the following fuse check/replacement
procedure:
1. Remove the four screws on the rear of the
PTC8001 that hold the enclosure together.
NOTE: Two of the screws are under the
battery compartment door.
2. With the case top open, locate the two
socketed mini fuses mounted near the
input/output connection jacks.
3. Remove one fuse at a time and check
continuity using an ohmmeter. A good fuse
will read 10 ohms or less. A blown fuse will
have a very high reading and generally show
as an open circuit.
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