Operating Instructions DFO/DFI Series Mechanical Convection Ovens/Incubator
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4.4 Checking and replacing the fuse (Fig 6)
With the mains plug connected and power switch in
“
on
”
position and if no LED and digits display,
check the fuse first. If any doubt that checking and replacing fuse is necessary, use a fuse with
the same size and capacity as rated and do as follows:
1)
Make sure the mains plug has been removed;
2)
Unloosen the two screws as shown, remove the cove plate and check or replace the fuse (Fig
6);
3)
Replace the cover plate and fasten the two screws.
Do not disassemble or exchange assembly parts and electric circuits! Hazard of
possible electric shock!
Except for replacing the fuse, there is no other part necessary for customer to
disassemble or repair. If repairing is desired, contact with authorized engineer.
Loosen the screws and disassemble the controller cover
for checking and replacing the fuse or checking, fixing
or measuring Pt100.
Checking and replacing of the fuse
(Check Table in 2.1.1 for fuse capacity)
Fig 6 Disassemble the controller cover for checking of the PCBA
Always remove the mains plug from the power socket when performing checking or
replacing the fuse, and never use any fuse different from the original one. Secure the
fuse once checked or replaced. For servicing or maintenance, call authorized service
engineer.
4.5 Clear error, warning and alarm
When the oven displays
Er01
,
Er02
, check the connections of the Pt100 where necessary. There are
two locations that loose connections of the sensor are possible, with one in the bottom plenum
and the other at PCBA.
Er01
and
Er02
are indications for short-circuit or open-circuit of the temperature sensor PT100.
For inspection, disconnect the power, and check the sensor within the bottom plenum first. Loosen
the screws for the bottom plenum at the front and on the top. Remove the bottom plenum. The
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