Patient monitors · Waveline family

DRE Medical Waveline Pro: troubleshooting and error codes

The ServiceForge knowledge base holds 33 documented symptoms for the DRE Medical Waveline Pro, with 47 ranked causes, 44 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Keyboard abnormal message displayed patient safety

Error message 'Keyboard abnormal' appears on schedule bar during monitoring software operation after power-up.

Ranked causes

1. Main board PC104 is bad (occasional)
2. Keyboard is bad (occasional)
3. Control board is bad (occasional)

First check

Check keyboard response and connections

Test point: Keyboard connector and keys
Expected: Keyboard responds to key presses without error message

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

No SpO2 and pulse rate values displayed patient safety

SpO2 probe connected but no oxygen saturation or pulse rate values are shown on display.

Ranked causes

1. SpO2 probe not connected properly (common)
2. Red LED light not illuminating in SpO2 probe (occasional)
3. SpO2 probe is bad (occasional)

First check

Verify SpO2 probe connection to monitor

Test point: SpO2 probe connector
Expected: Probe fully seated with good contact

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

AC indicator illuminated but display is black

Power indicator lights but TFT screen remains black with no output. Fan may or may not operate depending on power source.

Ranked causes

1. Display converter module is bad (common)
2. Power supply module is bad (occasional)

First check

Ensure fan operates when AC power is connected

Test point: Rear panel fan outlet
Expected: Fan running with audible airflow when AC powered

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

Battery capacity exhausted

Battery voltage drops below 7V, causing permanent battery damage. Occurs due to power supply module energy waste on other circuits.

Ranked causes

1. Extended non-use without AC power connection (common)
2. Power supply module not connected to AC for extended period (common)

First check

Verify battery voltage

Test point: Battery terminals
Expected: Above 7V

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

ECG lost message displayed during monitoring patient safety

Error message 'ECG lost' displayed on message area during patient monitoring operation.

Ranked causes

1. ECG electrodes not attached properly (common)
2. ECG lead selection is incorrect (occasional)

First check

Visually inspect ECG electrode placement on patient

Test point: Patient chest electrodes
Expected: Electrodes adhered well with good skin contact

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

Lead off message displayed during monitoring patient safety

Error message 'lead off' displayed on message area during patient monitoring.

Ranked causes

1. ECG leads not attached properly (common)
2. ECG cable is bad (occasional)

First check

Check ECG lead connections to monitor

Test point: ECG connector on monitor
Expected: All leads firmly seated in monitor connector

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

PC/104 Module cannot boot system

System fails to boot; PC/104 controller does not initialize

Ranked causes

1. Button battery depleted or faulty (common)
2. Incorrect resistor R74 installed (occasional)

First check

Verify button battery condition

Test point: PC/104 front side PCB battery location
Expected: Battery present and functional

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

Respiration waveform displays as baseline patient safety

Respiration waveform shows flat line (baseline) instead of normal undulating waveform during patient monitoring.

Ranked causes

1. RA and LL electrodes not attached properly (common)
2. ECG cable is bad (occasional)

First check

Visually inspect RA and LL electrode placement

Test point: Patient RA and LL electrodes
Expected: Electrodes well adhered with no lifting

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

Signal weak message during NBP measure patient safety

Error message 'Signal weak' displayed during non-invasive blood pressure measurement indicating inadequate signal.

Ranked causes

1. Cuff not attached tightly (common)
2. Patient arm position suboptimal (occasional)

First check

Verify cuff is attached securely to patient arm

Test point: NBP cuff around arm
Expected: Cuff snug but not causing discomfort or cutting off circulation

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

Temperature parameter displays lost patient safety

Temperature parameter shows 'lost' or invalid reading during patient monitoring.

Ranked causes

1. Temperature probe not connected properly (common)
2. Temperature probe is bad (occasional)

First check

Check temperature probe connector

Test point: Temperature probe connector on monitor
Expected: Probe connector fully seated and latched

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

TFT screen displays all white

Display shows white or blank screen after power-up, unable to display any graphics or text.

Ranked causes

1. Display cable disconnection (common)
2. Main board PC104 is bad (occasional)

First check

Ensure display cable is connected well

Test point: Display connector on PC104 and display module
Expected: Cable fully seated and latched

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

Unit does not power up

Monitor does not respond to power switch. AC indicator may or may not be illuminated. No display or fan operation.

Ranked causes

1. Power supply module is bad (common)
2. Battery is bad (occasional)

First check

Take out the battery

Test point: Battery compartment
Expected: Monitor powers on with external AC only

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

Air pressure error message during NBP measure patient safety

Error message 'Air pressure error' displayed during non-invasive blood pressure measurement.

Ranked causes

1. Blocked hoses in pneumatic system (common)

First check

Inspect NBP tubing for blockage

Test point: Pneumatic hoses from pump to cuff
Expected: All hoses clear and properly routed

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

Airleak message displayed during NBP measure patient safety

Error message 'Airleak' displayed on screen during non-invasive blood pressure measurement indicating air loss in system.

Ranked causes

1. Blocked hoses in pneumatic system (common)

First check

Inspect all NBP pneumatic hoses

Test point: NBP tubing from cuff to pump
Expected: Hoses open and unobstructed, not pinched or kinked

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

Beyond range message during NBP measure patient safety

Error message 'Beyond range' displayed during non-invasive blood pressure measurement indicating reading outside normal limits.

Ranked causes

1. Patient cuff or arm is in abnormal state (common)

First check

Examine patient arm and cuff condition

Test point: Patient arm and NBP cuff
Expected: Arm appears normal, no swelling, injury, or deformity. Cuff intact.

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

Calibration: PC/104 Module boot configuration

Procedure to restore PC/104 Module boot functionality after component replacement

Ranked causes

1. Configuration requires button battery and resistor R73 (common)

First check

Disassemble button battery

Test point: PC/104 front side PCB battery location (Figure 7-1)
Expected: Battery accessible and removable

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

Cannot enter monitoring interface after power-up patient safety

Display shows content but system does not respond to user input or fail to load monitoring software interface.

Ranked causes

1. Main board PC104 is bad (common)

First check

Power-up monitor and wait for boot sequence

Test point: Monitoring interface display
Expected: Monitoring software interface appears and responds to input

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

Cuff error message displayed during NBP measure patient safety

Error message 'Cuff Error' displayed on screen when attempting non-invasive blood pressure measurement.

Ranked causes

1. Cuff type is incorrect (common)

First check

Verify NBP cuff type in setup menu

Test point: NBP cuff type setting
Expected: Cuff type matches physical cuff applied to patient

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

ERT communication error message displayed patient safety

Error messages 'ERT Com Error', 'RESP Com Error', or both displayed on message area in upper middle of screen.

Ranked causes

1. ERT communication trouble (common)

First check

Verify ERT and RESP module cable connections

Test point: ERT/RESP module connectors
Expected: Cables fully seated and latched

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

Heart rate does not match ECG waveform patient safety

Displayed heart rate value or pulse rate does not correspond to ECG or pulse waveform on display.

Ranked causes

1. HR/Pulse display setting is incorrect (common)

First check

Access HR-Display setup menu

Test point: Monitor setup menu
Expected: 'Heart' or 'Pulse' setting matches displayed parameter

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

Missing R20 resistance on rear PC/104 controller PCB

Chip resistance R20 (4.7K ohm, 0603 package) is not assembled on the rear side PC/104 controller PCB.

Ranked causes

1. Manufacturing variance in pre-June 2005 units with non-EmCore-i313 PC104 (occasional)

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

Missing R20 resistor on PC/104 controller PCB

Chip resistance R20 (4.7K ohm, 0603 package) is missing or not assembled on rear side PC/104 controller PCB at R20 location (Figure 7-3).

Ranked causes

1. R20 resistor not assembled during manufacturing (pre-June 2005 models) (common)

First check

Inspect R20 location on rear PC/104 controller PCB

Test point: R20 location, Figure 7-3
Expected: 4.7K ohm resistor (0603 package) present and soldered

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

Missing resistor R20 on PC/104 controller PCB

Monitors manufactured before June 2005 without EmCore-i313 type PC104 may have missing chip resistance at R20 location

Ranked causes

1. Missing or defective R20 resistor on rear PC/104 controller PCB (occasional)

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

Multiple monitoring module communication errors patient safety

Multiple error messages 'SpO2 Com Error', 'ERT Com Error', 'RESP Com Error', and 'TEMP Com Error' all displayed.

Ranked causes

1. Control module trouble (common)

First check

Verify all module connections to control module

Test point: All module connectors
Expected: All cables connected and latched

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

Over motion message during NBP measure patient safety

Error message 'Over motion' displayed during non-invasive blood pressure measurement due to excessive patient arm movement.

Ranked causes

1. Patient arm is moving during measurement (common)

First check

Observe patient arm movement during measurement

Test point: Patient arm position
Expected: Patient arm remains still without motion or muscle tension

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

Over pressure message during NBP measure patient safety

Error message 'Over pressure' displayed during non-invasive blood pressure measurement indicating excessive pressure buildup.

Ranked causes

1. Patient cuff or arm is in abnormal state (common)

First check

Verify cuff size and fit on patient arm

Test point: NBP cuff and patient arm
Expected: Cuff appropriate size, not compressing excessively

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

Patient type error message during NBP measure patient safety

Error message 'Patient type error' displayed on screen during non-invasive blood pressure measurement attempt.

Ranked causes

1. Cuff type is incorrect for patient (common)

First check

Verify patient type and cuff match

Test point: NBP cuff type and patient type setting
Expected: Cuff type matches patient age/size category

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

PC/104 module will not boot system

System fails to boot from PC/104 controller module

Ranked causes

1. Battery failure or improper resistor configuration on PC/104 controller PCB (unknown)

First check

Verify button battery is present and seated

Test point: Front side PC/104 controller PCB
Expected: Battery present and fully seated

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

Signal over message during NBP measure patient safety

Error message 'Signal over' displayed during non-invasive blood pressure measurement.

Ranked causes

1. Patient arm doing unwinding or winding action (common)

First check

Observe if patient is rotating/winding arm

Test point: Patient arm motion during measurement
Expected: Patient arm stationary without rotational motion

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

SpO2 communication error message displayed patient safety

Error message 'SpO2 Com Error' displayed on message area in upper middle of screen after entering monitoring interface.

Ranked causes

1. SpO2 communication trouble (common)

First check

Verify SpO2 module cable connection

Test point: SpO2 module connector
Expected: Cable fully seated with good contact

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

TFT displays NBP message continuously

Screen shows 'NBP' word continuously on display and cannot advance to normal monitoring interface.

Ranked causes

1. NBP communication trouble (common)

First check

Verify NBP module cable connection

Test point: NBP module connector
Expected: Cable fully seated and latched

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

TFT screen displays skewbald pattern

Display shows scrambled, garbled, or discolored pattern instead of normal graphics or text.

Ranked causes

1. Main board PC104 is bad (common)

First check

Visual inspection of display pattern

Test point: TFT screen output
Expected: Corrupted or scrambled display

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

Wasting energy on circuits when power switch off caution

Power supply module drains energy from battery when switched off due to parasitic current draw on other circuits

Ranked causes

1. Parasitic current draw in power supply circuits when switch off (unknown)

1 corrective action and part numbers 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.