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Diagnosing Power Problems
Fuse 1 is in the circuit between the main electri-
cal input and the POWER switch. All power for
internal operations and instrument functions,
except heater power, passes through this fuse. If
this fuse blows, you will get no response from
the instrument when you attempt to turn it on.
Fuse 2 protects the heater coils in the furnace.
Because fuse 2 does not power the internal
logic, you may not know that this fuse is blown
until you try to heat a sample; the TGA passes
the confidence test with fuse 2 open.
Fuse 2 is always checked at the beginning of a
method. Power supplied by this circuit is
switched by a computer-controlled relay as well
as by the HEATER switch located on the
instrument's front panel. When both devices are
active, the light in the HEATER switch will
glow.
TA I
TGA 2950
5–17
NSTRUMENTS
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