Stress testing systems

Cardiac Science Q-Stress: troubleshooting and error codes

The ServiceForge knowledge base holds 29 documented symptoms for the Cardiac Science Q-Stress, with 54 ranked causes, 9 diagnostic checks with test points and expected values, and 18 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit does not power on

Blue and/or green LED fails to illuminate when unit is powered on

Ranked causes

1. Power cord not plugged into isolation transformer (common)
2. Power cord not connected to chart recorder (common)
3. Power switch in OFF position (common)
4. No power to outlet (occasional)
5. Bad fuse(s) (occasional)
6. Defective power cord (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

BP monitor data error

Blood pressure monitor fails to acquire or transmit data to system

Ranked causes

1. Incorrect device selected (occasional)
2. Incorrectly configured synchronization (occasional)
3. Noisy ECG waveforms (occasional)
4. Bad microphone or improper microphone position (occasional)
5. Problem with BP monitor setup or configuration (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No recorder output

Chart recorder does not produce output

Ranked causes

1. Power switch in OFF position (common)
2. Paper is out (common)
3. Interface cable disconnected (common)
4. Defective interface cable (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Treadmill communication disconnected

Loss of communication link with treadmill due to power or connection issue

Ranked causes

1. Treadmill unplugged or low voltage condition (common)
2. Incorrect COM or USB port selection (occasional)
3. Treadmill power is off (common)
4. Treadmill interface cable not connected properly (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Communication error with BP monitor - monitor disconnected

System cannot communicate with BP monitor; device is disconnected or turned off

Ranked causes

1. Monitor turned off (common)
2. Monitor not connected to PC (common)
3. Monitor not connected to correct port on PC (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Communication error with BP monitor - no data available

BP monitor connected but not transmitting data to system

Ranked causes

1. Monitor turned off (common)
2. Monitor not connected to PC (common)
3. Monitor not connected to correct port on PC (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Ergometer communication disconnected

System unable to communicate with ergometer device

Ranked causes

1. Ergometer interface cable disconnected or not properly connected (common)
2. Ergometer control mode not set up correctly (occasional)
3. Ergometer power is off (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Preamp not responding - power or connection issue

Preamp unit is not responding to commands; power or cable connection problem

Ranked causes

1. No power to preamp (common)
2. Preamp not connected or bad connection (common)
3. Faulty cable (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Performance Test

Checks preamp gain, noise, and impedance levels for each ECG channel; requires impedance service appliance connection

Ranked causes

1. Out-of-specification gain or impedance (unknown)
2. Out-of-specification noise level (unknown)

First check

Measure preamp gain and impedance per channel

Test point: Service dialog results display
Expected: Pass

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer connection or power issue

Printer not connected or powered; bad cable connection

Ranked causes

1. Printer power off or disconnected (common)
2. Faulty printer cable (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Adobe Reader displays wrong language

Adobe Reader application shows interface text in incorrect language; user needs to change language settings

Ranked causes

1. Language preference not set at application startup (common)

First check

Verify Application Language setting is correct

Test point: Adobe Reader Preferences > International > Application Language
Expected: Choose at application startup

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blanking of ECG data

Holes or missing data appear in ECG waveform display and printouts due to system overload

Ranked causes

1. PC system overload from multiple requests (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Leads-Off Test patient safety

Checks preamp leads-off detection capability for each electrode; requires impedance service appliance and manual lead disconnect/reconnect

Ranked causes

1. Leads-off detection malfunction (unknown)

First check

Verify leads-off detection for each electrode

Test point: Service dialog results per selected lead
Expected: Pass

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Self Test

Internal preamp status check to verify basic hardware function; displays pass/fail results in dialog box

Ranked causes

1. Preamp internal error (unknown)

First check

Verify preamp internal status via self-test

Test point: Service dialog Status box
Expected: Pass

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Treadmill speed and grade caution

Manual calibration procedure for TM and ST series treadmills to verify and adjust speed and grade accuracy

Ranked causes

1. Treadmill speed or grade requires calibration verification (unknown)

First check

Start calibration procedure

Test point: Treadmill Calibration tab
Expected: Start button available

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Database connection lost

Setup screens (protocol, procedure, final report, system) have no items in lists; application disconnected from database

Ranked causes

1. Application lost connection to database (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

DC card self-test error

DC card reported self-test error with specified error code, slot, and firmware version

Ranked causes

1. Preamp failure (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Dialog messages from network printer server

Print job dialog messages appear originating from a different system on network

Ranked causes

1. Network printer server sending remote print notifications (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG card not responding - power or connection issue

ECG card is not responding; power or connection to AcqPack compromised

Ranked causes

1. No power or bad connection to AcqPack (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG card self-test error

ECG card reported self-test error with error code, slot, and firmware version

Ranked causes

1. Preamp failure (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Electrode disconnected patient safety

Electrode lead has disconnected from patient; leads off condition detected

Ranked causes

1. Electrode disconnected from patient (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Preamp communication error - repeated self-test failure

Error detected communicating with preamp unit; self-test check failed

Ranked causes

1. Preamp failure (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Preamp self-test error - communication failure

Preamp unit failed self-test; communication error with acquisition hardware detected

Ranked causes

1. Preamp failure (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Preamp unit self-test error

Preamp unit is reporting a self-test error condition

Ranked causes

1. Preamp failure (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer out of paper

Printer paper tray is empty; cannot complete print job

Ranked causes

1. Out of paper in printer tray (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Printer unavailable or not found

System cannot locate printer or printer is not responding

Ranked causes

1. PC not configured with default printer (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Treadmill cable disconnected

Treadmill interface cable is not connected; no signal received from treadmill

Ranked causes

1. Cable disconnected (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Treadmill grade control error caution

Treadmill unable to achieve or maintain desired grade setting

Ranked causes

1. Treadmill not calibrated (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Treadmill motor overheated caution

Treadmill motor has overheated and stopped operating

Ranked causes

1. Motor thermal protection activated (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`An error occurred while printing`	Printer is unavailable or not found by system	Printer connection or configuration issue	error
`An error was detected communicating with the preamp unit`	Communication failure with preamp hardware	Preamp not responding to system commands	error
`A software self test error has been detected`	Preamp unit failed internal self-test; reboot required	Self-test failure during system startup or operation	error
`BP monitor data error`	Blood pressure monitor cannot communicate or acquire data	Device disconnection, incorrect configuration, or connection issue	warning
`Communication error with the BP monitor – BP Monitor is disc`	BP monitor is physically disconnected or powered off	Power loss, cable disconnection, or incorrect port assignment	error
`Communication error with the BP monitor – no data is availab`	BP monitor connected but not transmitting readings to system	Data acquisition failure after connection established	error
`DC card reported self test error code = xxx, slot = yyy, fir`	DC card self-test failed with specified error code	DC card hardware or firmware issue	error
`ECG card reported self test error code = xxx, slot = yyy, fi`	ECG card self-test failed with specified error code	ECG card hardware or firmware issue	error
`Electrode [name] Disconnected`	Electrode lead has disconnected from patient; leads off detected	Physical disconnection of electrode from patient skin	error
`If the Setup screens have no item in their lists`	Application has lost connection to the database	Database connectivity failure	error
`The ECG card is not responding`	ECG card not communicating with AcqPack	Power or connection issue to AcqPack	error
`The ergometer communication is disconnected`	System cannot communicate with ergometer device	Connection or configuration failure	error
`The preamp is not responding`	Preamp unit not communicating with system	Power loss or connection failure	error
`The preamp unit is reporting a self test error`	Preamp internal self-test failure detected	Preamp self-test execution failure	error
`The treadmill cable is disconnected`	Treadmill interface cable is not connected; no signal received	Physical cable disconnection	error
`Treadmill communication is disconnected`	Communication link between treadmill and system is lost	Power loss, voltage drop, or connection failure	error
`Treadmill grade control error`	Treadmill unable to achieve or maintain desired grade setting	Grade adjustment command failure	warning
`Treadmill motor over heated`	Treadmill motor has overheated and thermal protection has activated	Excessive motor temperature during operation	warning

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.