Troubleshooting using control libraries
Observation
Possible cause
Recommended action
Ion Sphere
™
Test Fragments
are not present in the Test
Fragment Report section of the
run report, and library
sequencing is poor
• Chip loading was poor.
• Control Ion Sphere
™
Particles were not added
to the sample
1. Confirm that the Control Ion Sphere
™
Particles (included in the Ion S5
™
Installation Kit) were added.
2. If controls were added, contact Technical
Support.
Control Ion Sphere
™
Particles
are present in the run report,
but AQ20 throughput is poor
• The quality of the library
was poor.
• The quality of the template
preparation was poor.
Verify the quality of the library and template
preparations using quality assessment
procedures recommended in the appropriate
library and template preparation user guides.
1. Use the Human CEPH Genomic DNA
Control or Human CEPH Control 200
Library, included in the Ion S5
™
Controls
Kit (Cat. No. A27760), to prepare
template-positive ISPs with the Ion Chef
™
Food Protection Instrument.
2. Use the ISPs in an Ion GeneStudio
™
S5
Food Protection Instrument run.
3. If AQ20 throughput is still below
specification, verify the quality of
unenriched and enriched ISPs to identify
a problem in template preparation.
4. If ISP quality is good, but AQ20 throughput
is below specification, contact Technical
Support.
Solid-state buffer leak
Observation
Possible cause
Recommended action
Two or more of the following
observed
• Excessive read trimming
or the number of short
reads is significantly
higher than expected.
• Percentage of low quality
reads is significantly
higher than expected.
• Poor sequencing
performance or no Test
Fragments.
A solid-state buffer leak
occurred.
Contact Technical Support.
Perform the pulse cleaning protocol if directed
to do so by Technical Support or your Field
Service Engineer (FSE).
Appendix B
Troubleshooting
Troubleshooting using control libraries
B
Ion GeneStudio
™
S5 Food Protection Instrument User Guide
41