ProBP 3400

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.

Won't power on source ↗

• Replace with a fully charged battery
• Battery contact harness: undamaged, correct polarity, seated at J2 on the main board
• Flex cable seated at J5; replace the front housing (keypad), then the main board

Battery won't charge / short run time source ↗

• Check external connections and charge for 6 h; replace battery
• Check the J2 harness; replace the main board

Display blank or cracked, no backlight source ↗

• Replace the main board (the display is part of it)

Button unresponsive source ↗

• Check the flex cable at J5; replace the front housing, then the main board

USB or Bluetooth comms fail source ↗

• Confirm the unit is on; replace the USB cable; test with the Welch Allyn Service Tool
• Use the IFU Bluetooth troubleshooting first; then replace the main board

Cuff won't inflate, inaccurate or no BP, persistent NIBP errors source ↗

• Check external connections; replace the NIBP hose and cuff
• Manifold to pump, valves and transducer; dump valve cable at J10 (main board); pump cable at J80 (BP board)
• Leak or clogged filter: replace the manifold; then the pump, BP board, main board

Cuff deflates too slowly source ↗

• Occlusion blocking the valves: replace the manifold; then the BP board or main board

After any repair source ↗

• Run the full functional test suite in Service Tool Gold Edition

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