Fetal transducer systems · Avalon CTS family

Philips M2720A: troubleshooting and error codes

The ServiceForge knowledge base holds 24 documented symptoms for the Philips M2720A, with 29 ranked causes, 26 diagnostic checks with test points and expected values, and 4 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

No signal received at fetal monitor

Monitor does not show TELE indicator, indicating no good connection to Avalon CTS

Ranked causes

1. Transducer not properly positioned or signal weak (common)
2. RF link not established (occasional)

First check

Wait for ready lamp after power on

Test point: Base station indicator lamp
Expected: Ready lamp illuminated

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

Transducer communication lost

Transducer warning indicator blinks; base station cannot communicate with transducer

Ranked causes

1. Transducer out of range or inactive (common)
2. Antenna connection loose or faulty (occasional)

First check

Verify transducer is active and within range

Test point: Transducer power and proximity to base station
Expected: Transducer powered and within range

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

Transducer out of range or inactive

Warning symbol blinks on base station; transducer not communicating

Ranked causes

1. Transducer out of wireless range (common)
2. Antenna connection loose or damaged (occasional)

First check

Verify transducer is active

Test point: Transducer power state
Expected: Transducer powered on and responding

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

Unable to switch from DECG to ultrasound monitoring patient safety

Transducer change procedure not completing properly when transitioning from DECG to US mode

Ranked causes

1. DECG adapter cable and fetal scalp electrode not disconnected before transducer removal (occasional)
2. US transducer lamp not green when removing (occasional)

First check

Verify DECG adapter cable is disconnected from ECG transducer

Test point: ECG transducer connector
Expected: DECG adapter cable detached; fetal scalp electrode removed

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

Unable to switch from ultrasound to DECG monitoring patient safety

Transducer change procedure not completing properly when transitioning monitoring modes

Ranked causes

1. US transducer not properly docked before ECG transducer removal (occasional)
2. ECG transducer lamp not green when removing (occasional)

First check

Verify US transducer is docked in base station

Test point: Base station slot
Expected: US transducer seated and locked

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

Active ECG transducer cable not connected

ECG warning on base station; ECG cable not connected to active ECG transducer

Ranked causes

1. ECG cable disconnected from active ECG transducer (common)

First check

Verify cable is connected to active ECG transducer

Test point: ECG cable connector on transducer
Expected: ECG cable securely connected

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

Active ECG transducer not connected

Transducer warning indicator blinks; active ECG transducer detected without cable connection

Ranked causes

1. ECG transducer cable disconnected (common)

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

ECG transducer cable disconnected

Warning on base station indicates ECG transducer requires cable connection

Ranked causes

1. ECG transducer cable not connected (common)

First check

Verify ECG transducer cable connected

Test point: ECG transducer connector
Expected: Cable firmly seated

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

Error message E9 displayed

Two active transducers transmitting FHR to the same base station simultaneously

Ranked causes

1. Two active transducers transmitting FHR to same base station (common)

First check

Verify only one transducer is active and transmitting to base station

Test point: Base station slots
Expected: Only one transducer actively transmitting FHR

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

RF Link lamp comes on instead of Ready lamp

Ready lamp goes out and RF Link lamp illuminates; indicates loss of ready state during operation

Ranked causes

1. Transducer wireless connection issue or signal loss (unknown)

First check

Verify fetal monitor displays TELE indicating good connection to Avalon CTS

Test point: Fetal monitor display
Expected: TELE

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

Slot blocked or occupied

Blocked slot icon blinks on base station; slot contains active transducer

Ranked causes

1. Another active transducer already assigned to this slot (common)

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

Transducer battery low

Transducer warning indicator blinks; transducer needs charging or battery replacement

Ranked causes

1. Transducer battery depleted (common)

First check

Charge transducer in dock for 30 minutes

Test point: Transducer dock
Expected: Battery charged

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

Transducer battery low or depleted

Battery warning indicator blinks on base station; transducer cannot operate without charge

Ranked causes

1. Battery depleted or insufficient charge (common)

First check

Verify transducer is docked to base station for charging

Test point: Transducer dock connection
Expected: Transducer seated in dock

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

Transducer in wrong slot

Slot position warning on base station; transducer docked in incorrect slot position

Ranked causes

1. Transducer placed in incorrect slot position (common)

First check

Check position indicator dot on base station

Test point: Position indicator dot on base station near slots
Expected: Dot indicates correct slot position for transducer

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

Transducer in wrong slot position

Warning on base station; transducer positioned in incorrect slot

Ranked causes

1. Transducer placed in wrong slot (common)

First check

Identify correct slot position

Test point: Base station slot alignment dot
Expected: Dot indicates correct transducer slot

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

Transducer installed in wrong slot

Wrong slot icon blinks on transducer display; transducer positioned incorrectly

Ranked causes

1. Transducer placed in incorrect slot position (common)

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

Transducer not docking properly

Unable to dock transducer in base station slot for charging or switching between monitoring modes

Ranked causes

1. Transducer inserted in wrong slot or slot occupied (unknown)

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

Transducer not registered

Transducer cannot register on base station; contact support required

Ranked causes

1. Transducer registration failure (rare)

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

Transducer not registered or communication failure

Registration or communication error warning on base station; transducer could not register with system

Ranked causes

1. Transducer could not register with base station (rare)

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

Transducer not registered with base station

Registration failure; transducer cannot communicate with base station

Ranked causes

1. Transducer registration failure (rare)

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

Transducer placed in wrong slot

Transducer warning indicator blinks; transducer inserted in incorrect position slot

Ranked causes

1. Transducer in wrong slot position (common)

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

Transducer registration failed

Registration error icon blinks on base station; transducer could not register

Ranked causes

1. Transducer registration error (rare)

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

Transducer slot blocked

Warning symbol indicates slot is occupied by another active transducer

Ranked causes

1. Slot occupied by active transducer with different bed label (common)

First check

Press release button for two seconds

Test point: Base station slot release button
Expected: Slot becomes available

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

Transducer slot blocked or occupied

Slot warning indicator on base station; attempting to dock transducer to slot that already has active transducer

Ranked causes

1. Slot occupied by another active transducer (common)

First check

Identify which transducer is blocking the slot by checking bed label

Test point: Transducer bed label display
Expected: Bed label visible on blocking transducer

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

Error codes

Code	Meaning	Trigger	Severity
`E0 to E9`	Base station and transducer error messages	Various system faults	unknown
`E0 to E9`	Various error codes defined in Instructions for Use	Base station or transducer operational errors	unknown
`E9`	Two active transducers transmitting FHR to same base station simultaneously	Two or more fetal transducers actively transmitting heart rate to same base station	error
`RF Link`	Radio frequency link established between transducer and base station	Ready lamp goes out when transducer is applied	info

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.