Thermo Fisher Scientific Thermo Fisher 7900HT PCR
Thermo Fisher Scientific · Model Thermo Fisher 7900HT PCR
Fast PCR option reduces run time to about 35 minutes in a standard 96-well format, or about 55 minutes in a 384-well plate Continuous wavelength detection from 500-660 nm allows the use of multiple fluorophores in a single reaction Measure gene expression levels, detect and quantitate pathogens, perform allelic discrimination (SNP genotyping) assays as well as score the presence of gene sequences 96- or 384-well plate compatibility (including the TaqMan Low Density Array) Optional Enterprise edition software provides data analysis tools that support 21 CFR Part 11 guidelines providing data integrity and security Hands-free plate-loading and unloading provides true walkaway automation allowing users to increase user lab's productivity Proven assay development guidelines save time and money.
Key tips
- ·Run QC controls before trusting any repair - an analyzer that passes self-test can still report clinically wrong results.
- ·Rule out a reagent lot change before opening the instrument - it can look exactly like a hardware fault.
- ·Centrifuge rotors have a hard retirement age/cycle limit regardless of visible condition - don't eyeball it.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Thermal / block uniformity fault
HighSymptoms: Wells at the edge vs centre give different Ct, failed thermal verification, ramp errors.
Root cause: Peltier block ageing / a failed Peltier zone, a heated-lid fault, or a fan / heatsink fault.
Optical / calibration fault (real-time)
HighSymptoms: High background, low signal, dye / ROI or pure-dye calibration fails, poor amplification curves.
Root cause: Excitation LED / lamp ageing, optics contamination, or an out-of-date calibration.
Heated lid / seal fault
MediumSymptoms: Evaporation, condensation on the seal, inconsistent replicates, lid-pressure error.
Root cause: Heated-lid heater or the lid-pressure mechanism / seal.
Software / instrument-comms fault
MediumSymptoms: Instrument not detected, runs will not start or export, firmware mismatch.
Root cause: USB / network link, driver, or the control PC.
Fan / cooling fault
LowSymptoms: Slow ramp-down, over-temperature warning, loud fan.
Root cause: Failed or clogged cooling fan.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Peltier sample block
Class Major service partRel. cost $$$$R&R Difficult
Excitation LED / lamp module
Class Periodic replacementRel. cost $$$R&R Moderate
Heated-lid heater / seal
Class Major service partRel. cost $$R&R Moderate
Cooling fan
Class Periodic replacementRel. cost $R&R Fairly easy
Dye calibration kit
Class Frequent wear itemRel. cost $$R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Peltier sample block | Major service part | $$$$ | Difficult |
| Excitation LED / lamp module | Periodic replacement | $$$ | Moderate |
| Heated-lid heater / seal | Major service part | $$ | Moderate |
| Cooling fan | Periodic replacement | $ | Fairly easy |
| Dye calibration kit | Frequent wear item | $$ | Easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Daily QC controls run and reviewed
- ·Calibration verification per assay
- ·Routine cleaning and decontamination
- ·Scheduled reagent-path and pump-tubing maintenance
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: QC / calibration failure across a channel or the whole system
- Run fresh controls at all levels and note which analytes fail.
- Confirm reagents are in date, correctly loaded, mixed and not bubbled.
- Run the photometer / lamp-energy check and replace the lamp if energy is low.
- Clean the sample and reagent probes, the mixers and the wash / cuvette-wash stations.
- Recalibrate the affected assay / ISE module and re-run QC.
Symptom: Sample or reagent probe clog / crash / short aspiration
- Inspect the probe for a bend or blockage and clear it (wire / sonicate per the manual).
- Run the fluidics prime and the probe-wash cycle.
- Check for a clot or fibrin in the sample and the liquid-level sensing.
- Verify probe positioning / alignment.
- Replace the probe if aspiration is still short.
Symptom: ISE electrolyte results biased or noisy / ISE calibration fails
- Run the ISE calibration and check the slope / drift against spec.
- Replace an ISE electrode or the reference that is at end of life.
- Check the ISE pinch valves and tubing for wear or air.
- Confirm the ISE standard packs are in date.
- Re-run ISE QC before releasing electrolyte results.
Symptom: High cuvette blanks / position-dependent results
- Run the cuvette blank / photometric check.
- Clean or replace worn / scratched cuvettes or the reaction segment.
- Check the cuvette-wash station nozzles and drying.
- Confirm the water / DI supply quality.
- Recalibrate and re-run QC.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Central / core laboratory
- Point-of-care testing stations
- Blood bank
- Microbiology lab
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
Through internal quality review, firm determined the need to conduct a more comprehensive system validation to support the claim of complete bacterial, fungal and viral disinfection efficacy.
Related calculators
From BioLab, for work done with this kind of equipment.
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