Cardiac Science Quinton ST55
Cardiac Science · Model Quinton ST55
Features digitally controlled AC-drive system that delivers greater performance, improved accuracy, and increased reliability. Speed start at.8 mph to 9.6 mph. 400 lb user weight capacity. Length: 80.2” (204cm). 115V/20A power required. Dedicated circuit required.
Key tips
- ·When no category-specific guidance fits, default to the manufacturer's own service manual and the general troubleshooting method in the Engineer's Guide.
- ·Run an incoming and annual electrical safety test regardless of how niche the device is.
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.
Treadmill does not start / no display
HighSymptoms: Belt will not run, no display on the ECG monitor, no response to start.
Root cause: Building or treadmill circuit breaker tripped, blown treadmill fuse, a cut power cord, or a faulty control cable between the variable-speed drive (VSD) and the ECG monitor, or a VSD failure.
Speed or grade error / inaccuracy
MediumSymptoms: Belt speed or incline does not match the setting, error code on the ECG monitor, grade drifts.
Root cause: Grade potentiometer needs calibration, a grade-motor / limit-switch fault, or a VSD speed-feedback fault.
Walk belt / deck wear
MediumSymptoms: Belt slips, drifts off-centre, rubs the frame, rough or noisy running.
Root cause: Worn or stretched walking belt, worn deck, or drive-belt tension loss.
Excess noise / vibration
LowSymptoms: Rumble, squeal, or vibration under load.
Root cause: Worn rollers/bearings, drive belt, or motor.
Handrail / emergency-stop fault
HighSymptoms: Loose handrail, emergency stop not stopping the belt (a recall flagged inadequate electrical-safety testing on some 2006-2009 units).
Root cause: Loosened fasteners or a failed e-stop switch/wiring.
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.
Walking belt
Class Periodic replacementRel. cost $$R&R Moderate
Deck
Class Periodic replacementRel. cost $$R&R Moderate
Drive belt
Class Periodic replacementRel. cost $R&R Moderate
Grade motor / potentiometer
Class Major service partRel. cost $$R&R Moderate
Roller / bearing set
Class Major service partRel. cost $$R&R Moderate
Treadmill fuse
Class Major service partRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Walking belt | Periodic replacement | $$ | Moderate |
| Deck | Periodic replacement | $$ | Moderate |
| Drive belt | Periodic replacement | $ | Moderate |
| Grade motor / potentiometer | Major service part | $$ | Moderate |
| Roller / bearing set | Major service part | $$ | Moderate |
| Treadmill fuse | Major service part | $ | Fairly 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.
- ·Follow the manufacturer's PM schedule
- ·Perform incoming and annual electrical safety testing per facility biomedical program
Error Codes
Extracted directly from this unit's own service manual.
E201Grade Error
Replace grade Pot and recalibrate. If error persists, replace grade motor.
E202Speed Error Software tachometer fault
Press Power or reset. If error persists, replace controller assembly.
E203Overcurrent Error
Restrict use to speed envelope. Check for obstructions in disconnected motor pulleys. Replace motor if necessary.
E204Communications Error
Verify communication cable connection at each end. Verify cable pins are not bent or broken or cable damaged. Check Ds2 on VSD board. Replace controller if damaged, otherwise replace cable.
E001Microprocessor VSD Microprocessor EPROM RAM failure
Press Power or reset. If error persists, replace VSD Board.
EPHlEPHl Error (BUS voltage problem)
Check line voltage. Disconnect power and wait. THEN power up. Check transformer output: J7 pin 9 and 10. BUS Voltage
EPLOEPLO Error (BUS voltage problem)
Check line voltage. Disconnect power and wait. THEN power up. Check transformer output: J7 pin 9 and 10. BUS Voltage
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: Treadmill will not start, no display
- WARNING: high voltage under the hood persists for a few minutes after unplugging - turn off the circuit breaker and unplug before removing the hood.
- Check the building circuit breaker and the treadmill breaker/fuse.
- Inspect the power cord for damage.
- Check the control cable between the VSD and the ECG monitor for a fault.
- If power is present and cabling is good, suspect a VSD failure - refer to Chapter 4 for replacement.
Symptom: Speed or grade inaccurate
- Calibrate the grade potentiometer where the procedures specify.
- Check the grade motor and limit switches.
- Verify belt speed with a tachometer against the setting.
- Inspect the VSD speed-feedback path.
- Re-verify speed and grade accuracy after adjustment; centre and tension the walking belt (within 0.25 in of the sides).
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Varies by device - check the unit's own manual for facility placement guidance
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
28 stress and rehab treadmills manufactured between September 2006 and January 2009 may not have received adequate electrical safety testing prior to being shipped from the factory. If these components break down in the field, a patient or operator could be exposed to excess touch currents on the surface of the product. Because safety testing may not have allowed for complete evaluation of the el
Troubleshoot this device with Bio
Describe a symptom or error code. Bio answers from this device's own documented error codes, failure modes, parts, and guides.
Ask Bio