Bio-Rad Model 2110 Fraction Collector - Manual (Page 27)

Tools required: Small phillips-head screwdriver, small slot-head screw
driver.
Procedure:
1. Disconnect the Model 2110 collector from the power source.
2. Disconnect any tubing leading to the fraction collector, remove the yellow
plastic arm cap, white rubber drop former, and carousel.
3. Clean the optical window and light source (located in drop arm), using the
a cotton swab moistened with water.
4. Set fraction collector on its side with underside of the instrument facing
toward you.
5. Remove the four phillips-head screws from the underside of the instru-
ment. Pull gently on the rubber feet to remove the underside panel.
6. Locate the large circuit board with the power transformer. On this board,
locate a small rectangular potentiometer, identified as "R3" on the circuit
board. R3 is located near where the ribbon cable connects to the circuit
board.
7. Read safety warning above. Use a plastic-handled screwdriver to min-
imize the risk of electric shock.
8. Press and hold down both the "up" and "down" arrow keys on the front
panel.
9. While continuing to press down arrow keys, connect the fraction collec-
tor to the power source. Continue to press down both keys for five sec-
onds, then release.. The "time" LED will glow steadily, and the display
will show a decimal point, followed by three characters (._ _ _). The frac-
tion collector is now in a "diagnostic" mode.
10. Using a small flat-bladed screwdriver, adjust R3 by turning the small
screw until the display reads between "0A0" and "0A5".
If a reading between "0A0" and "0A5" cannot be obtained, contact your
local Bio-Rad representative.
11. Disconnect unit from the power source.
12. Replace underside panel.
13. Connect fraction collector to a power source. The Model 2110 Fraction
Collector is now ready for operation.
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