Barnstead International MIRAK 725 Series, Operation Manual And Parts List, Page: 23 / 36

11. Remove the two screws holding the motor and
replace the motor.
12. Replace the magnet assembly.
13. Flip plate over, making sure thermocouple wire
comes through the plate. Reinsert screws and
tighten. (Stirrers do not have thermocouple
wires.)
14. Replace encoder wheel. This will need adjusting
in the next step.
15. Replace logic board. Adjust encoder wheel so
that it freely rotates through slot (optical pickup)
on logic board. The black slot on the logic board
should project no further than the holes in the
outer perimeter of the encoder wheel.
16. Reconnect wires as noted in step 2.
17. Replace the display board and reconnect wires
as noted in step 2.
18. Replace bottom and secure with screws.
Replacing the Top Plate
Assembly
1. Unplug unit, turn unit upside down and remove
screws from bottom.
2. Open unit. Note position and color of wires and
cables connected to all three boards.
3. Remove logic board as described above.
4. Remove wires and cables from the power and
display boards.
5. Remove the screws holding the metal plate onto
the case. (4 screws on 7" x 7" models, 6 screws
on 12" x 12" models.)
23
M
AINTENANCE AND
S
ERVICING