SureSigns VS3

1. Make sure the patient is safe — swap in a backup unit if you need to.
2. Reproduce the complaint yourself and write down exactly what you see (screen, alarm, code).
3. Check power, battery, cables, accessories, and settings before ordering parts.
4. Then open the service manual above and follow its troubleshooting section.

Runs on battery but not AC source ↗

• Check power cord plugged in / not broken
• Check fuse
• Check power supply output 15 V; check DC-in cable and AC connector
• Then front panel keypad, then main board

Runs on AC but not battery source ↗

• Charge battery
• Reseat battery and battery cable
• Replace battery connector board, then main board

Won't turn on with either AC or battery source ↗

• Work through the AC-only and battery-only steps; then replace the LCD

Battery service required source ↗

• Max Error over 8%, or Full Capacity at half of Design Capacity: recondition the battery

Screen blank or distorted, or freezes at boot source ↗

• Blank: check Standby (press On/Standby), then the backlight/LCD/main board connections
• Distorted graphics on white: reseat the LCD signal cable; replace the LCD
• Freezes at the opening screen or colour bar: replace the main board

AUDIO FAILED (flashing red/white box), or no audible alarms source ↗

• Check the speaker connection; clear it by running the speaker test or clearing the error log
• Check Audio Pause/Off; replace the speaker, then the main board

NBP cuff won't inflate, or no or unreliable readings source ↗

• Straighten kinked tubing; replace a leaking cuff; check cuff size and initial pressure setting
• Replace the blocked NBP pump filter, then the pump module or main board; recalibrate (NBP Calibration Procedure)

Temperature not displayed or unreliable source ↗

• Probe connected and seated in its well; predictive range is 15–45°C
• Tympanic high: torn or loose cover; low: obstruction
• Temporal low: moist skin, readings under 30 s apart, curved sweep, dirty lens
• Calibrate or test the module; replace the probe, front end board or module

Only one Charging LED colour source ↗

• Replace the membrane switch assembly

Won't power on source ↗

• Confirm AC cord/outlet and battery charge
• Check internal power/battery harnesses
• Measure power supply output against spec (15 V DC on Welch Allyn Connex and Philips VS3)
• Charge battery fully; replace if still empty

Touchscreen issues source ↗

• Check whether touch is disabled/locked
• Calibrate touchscreen
• Check touchscreen cables before replacing parts