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4-2
Troubleshooting
Troubleshooting
Gels
Problem
Possible Cause
Solution
Leaking wells
Loose combs
Sequencing: Electrophorese
immediately, then after each three
loads with the eight-channel loader.
GeneScan: Leaking wells are not
tolerated in GeneScan applications. If
a well leaks, it is best to run another
gel. At the very least, do not use the
wells around the leaking lane.
Bad clamps
Be sure to use three “bulldog” clamps
(P/N 4305386) with 10–12 lbs.
clamping pressure.
Burrs or bent
teeth on comb
Remove the burrs or replace the
comb.
Bent, kinked, or
damaged
spacers
Replace the spacers.
Error: “Your
CCD offset is
too high. I will
reset it to zero.”
The CCD
reading is below
zero during
calibration scan
Reset the CCD offset value:
a.
Open 377-96 Collection.
b.
In the Run window select the
Run module.
c.
Double-click the small document
icon next to the Run Module
pulldown menu.
d.
Change the CCD offset value to
zero.
e.
Click Save as Default.
Comb is
difficult to
insert
Using a different
comb
Be sure to use same comb for
loading that was used for casting.
Clamps are too
tight
♦
Insert comb slowly. Fix any
misaligned teeth with a syringe
before they touch the gel.
♦
Use looser clamps on future
gels.
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