Fetal monitors · Series 50 family

Philips 50: troubleshooting and error codes

The ServiceForge knowledge base holds 106 documented symptoms for the Philips 50, with 153 ranked causes, 102 diagnostic checks with test points and expected values, and 119 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 maternal measurements printed on trace

Maternal parameters do not appear on printed trace when using Philips CMS or 26/24 Series interface

Ranked causes

1. Parameters switched off (common)
2. Incorrect interface cable (occasional)
3. Incorrect Philips CMS software revision (occasional)
4. Other RS232 external devices blocking communication (occasional)
5. Incorrect RS232 port configuration (occasional)

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

No maternal measurements printed on trace from Philips CMS interface

Philips Component Monitoring System interface produces no maternal parameter output

Ranked causes

1. Parameters switched off in monitor (common)
2. Incorrect interface cable (occasional)
3. Incorrect Philips CMS software revision (occasional)
4. Other RS232 devices blocking communication (occasional)
5. Incorrect RS232 port configuration (occasional)

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

PCMCIA modem not detected or defective

ERR70 error message displayed with three beeps indicating modem hardware issue, incorrect installation, incompatibility, or interface board failure.

Ranked causes

1. Modem is defective (occasional)
2. Modem installed incorrectly (occasional)
3. Incompatible or unapproved modem (occasional)
4. Interface board is faulty (rare)

First check

Verify modem physical installation

Test point: PCMCIA card slot
Expected: Modem fully seated per manufacturer instructions

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Invalid telemetry mode

Signal indicators flashing or error displayed; telemetry system not operating correctly

Ranked causes

1. Telemetry receiver cable issue (common)
2. Incompatible or incorrect transducer (common)
3. Transducers connected to front panel (occasional)

First check

Inspect telemetry receiver cable

Test point: Receiver cable connection
Expected: Cable intact, connectors secure
Tools: Visual inspection

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

PCMCIA modem not responding

Error 70 displayed for 10 seconds with three audible tones when modem is either incorrectly installed, faulty or not approved model

Ranked causes

1. Modem incorrectly installed (common)
2. Modem faulty (occasional)
3. Modem not approved model (occasional)

Receiver Assembly output level low high voltage

Spectrum Analyzer measurement at 450 MHz shows level below -32 dBm when measuring Preamplifier output via AC Coupler

Ranked causes

1. Preamplifier Board defective (common)
2. Coax cable defective (occasional)
3. Receiver Processor Board (503) defective (occasional)

First check

Measure Preamplifier output level at 450 MHz

Test point: Preamplifier output via AC Coupler to Spectrum Analyzer input
Expected: > -32 dBm, >
Tools: Spectrum Analyzer, AC Coupler

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

Receiver green LED not flickering high voltage

Green LED on Receiver Assembly does not flicker after power-on; +5V, -12V, +12V voltages present

Ranked causes

1. Receiver Assembly defective (common)
2. Flat cable defective (occasional)
3. Receiver Processor Board defective (occasional)

First check

Verify green LED flickers after power-on

Test point: Receiver Assembly green LED
Expected: LED flickering

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

Recorder thermal array print degradation

Thermal print quality poor, faint traces, missing dots, or uneven density on paper

Ranked causes

1. Thermal line printer head contamination or wear (common)
2. Incorrect print density setting (occasional)
3. Worn thermal printing paper (occasional)

First check

Inspect thermal line printer head visually

Test point: Printer head surface
Expected: Clean, no discoloration or residue

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Transmitter VCXO test signal incorrect high voltage

RF output signal does not match expected voltage or FSK modulation characteristics when measured with spectrum analyzer

Ranked causes

1. Transmitter Board defective (common)
2. Transmitter VCXO defective (occasional)
3. Transmitter Processor Board 501 defective (occasional)

First check

Measure DC voltage at test point 1

Test point: 1
Expected: +2.5V DC

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

Ultrasound transducer does not detect fetal heart patient safety

No fetal heart rate signal detected; Doppler beam not functioning or signal quality degraded

Ranked causes

1. Transducer immersed in water while connected to monitor (occasional)
2. Incompatible or non-approved ultrasound gel used (occasional)
3. Transducer crystals damaged or transducer failure (rare)

First check

Verify transducer is disconnected from monitor

Test point: Transducer connector
Expected: Physically disconnected

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

Unit does not power on or reset occurs high voltage

Monitor fails to start or continuously resets; no regulated voltages or insufficient voltage output

Ranked causes

1. +5V regulator failure or output below 4.6V (common)
2. +24V regulator failure or output below 14.8V (common)
3. +2.5V reference voltage generator failure (occasional)

First check

Measure +5V regulated output

Test point: Power supply board +5V rail
Expected: +5V, +/-0.5V
Tools: Digital multimeter

2 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Upgrade failed tone heard

Series of short beeps lasting 2 seconds emitted from upgrade key

Ranked causes

1. Battery in upgrade key is low (common)
2. Maximum number of upgrades already performed on key (occasional)
3. Communication or connection error (unknown)

First check

Verify upgrade key battery status

Test point: upgrade key
Expected: Battery is not depleted

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

All receiver LEDs stay on when powered

All lights remain illuminated continuously after receiver power-on, indicating possible receiver, interface cable, or fetal monitor defect.

Ranked causes

1. Fetal monitor switched off (common)
2. Defect in receiver, interface cable or fetal monitor (occasional)

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

All receiver lights stay on when powered on

All lights on the receiver illuminate when the receiver is switched on

Ranked causes

1. Fetal monitor is switched off (common)
2. Defect in receiver, interface cable or fetal monitor (occasional)

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

Calibration: FSpO2 monitor power cycling procedure

Establish correct power-on and power-off sequence for dual-switch Nellcor FSpO2 monitor to ensure proper startup and normal data display

Ranked causes

1. Verify correct power switch sequencing (common)
2. Execute correct power-on sequence (common)

First check

Power off in sequence: front to standby, rear to off

Test point: Front and rear power switches
Expected: Both switches in off/standby position; monitor powered down

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

INOP transmission lamp remains lit after patient moves short distance from receiver

The INOP transmission lamp continues to light even after the patient has moved a short distance away from the receiver

Ranked causes

1. Local antenna not connected correctly (common)
2. Remote antenna cable not connected correctly to receiver (occasional)

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

No maternal SpO2 and no MHR measurements printed

Nellcor N-200 monitor produces no SpO2 or MHR output on trace

Ranked causes

1. Nellcor monitor powered by internal battery (common)
2. Wrong DIP switch configuration of N-200 monitor (occasional)

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

No maternal SpO2 and no MHR measurements printed on trace

SpO2 and MHR values do not appear on printed trace from Nellcor N-200 monitor

Ranked causes

1. Nellcor monitor powered by internal battery (common)
2. Wrong DIP switch configuration of N-200 monitor (occasional)

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

No maternal temperature printed on trace

Temperature measurement not appearing on trace output from Philips CMS interface

Ranked causes

1. TEMP1 not labeled as T1 (common)
2. Temperature sensor not connected to TEMP1 module (occasional)

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

Receiver Power On Light does not light

Power On Light remains off when receiver is switched on.

Ranked causes

1. Power cable not plugged in (common)
2. Fuses need replacing (common)

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

Receiver Power On Light does not light when receiver is switched on

The Power On light on the receiver fails to illuminate when the receiver is switched on

Ranked causes

1. Power cable not plugged into the power supply (common)
2. Fuses need replacing (occasional)

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

Receiver VCXO output signal incorrect high voltage

VCXO output frequency or level outside specification when measured at transistor amplifier using Spectrum Analyzer

Ranked causes

1. Receiver VCXO defective (common)
2. Receiver Assembly defective (occasional)

First check

Set Spectrum Analyzer START frequency

Test point: Spectrum Analyzer control
Expected: 400 MHz

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

SpO2 warning 'SpO2 low signal' message patient safety

SpO2 signal weak; measurement less accurate than normal

Ranked causes

1. Transducer positioning or contact issue (common)
2. Wrong transducer type selected (occasional)

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

Telemetry Indicator Lamp does not light

Telemetry Indicator Lamp on fetal monitor does not illuminate when monitor and receiver are both switched on.

Ranked causes

1. Incorrect interface connection (common)
2. Faulty interface cable (occasional)

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

Telemetry Indicator Lamp does not light when monitor and receiver are switched on

The Telemetry Indicator Lamp on the fetal monitor does not illuminate when both monitor and receiver are powered on

Ranked causes

1. Incorrect interface connection between monitor and receiver (common)
2. Faulty interface cable (occasional)

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

Transmission INOP lamp lit after patient movement

INOP transmission lamp illuminates after patient moves a short distance away from receiver.

Ranked causes

1. Local antenna not connected correctly (common)
2. Remote antenna cable not connected correctly (common)

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

Transmission INOP light on receiver remains lit when transmitter is switched on

The Transmission INOP light continues to illuminate even when the transmitter is powered on

Ranked causes

1. Receiver and transmitter do not have the same channel or serial number (common)
2. Batteries in the transmitter are exhausted (occasional)

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

Transmission INOP light stays lit

Transmission INOP light remains illuminated after transmitter is switched on.

Ranked causes

1. Receiver and transmitter channel or serial number mismatch (common)
2. Transmitter batteries exhausted (common)

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

Upgrade key does not emit start tone

No 'start upgrade' tone heard when upgrade key is connected to monitor

Ranked causes

1. Battery in upgrade key is low (common)
2. Maximum number of upgrades already performed on key (occasional)

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

Upgrade key produces no tone or 'upgrade failed' tone

When upgrade key is plugged into service socket, technician hears either no sound or a series of short beeps lasting two seconds instead of the expected 'start upgrade' tone (two short beeps)

Ranked causes

1. Features already installed on monitor (common)
2. Low battery in upgrade key (common)

First check

Verify feature label presence on monitor front panel

Test point: Front of monitor
Expected: Feature label present indicates upgrade already installed; no label indicates upgrade needed

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

-12V output incorrect or missing high voltage

-12V rail fails to reach specified level or output is absent

Ranked causes

1. +5V regulator fault preventing -12V regulator operation (occasional)

First check

Verify +5V is at nominal 5.0V

Test point: Power supply board +5V rail
Expected: 5.0V, +/-0.5V
Tools: Digital multimeter

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

Calibration: Monitor cleaning and maintenance caution

Procedures for keeping the Series 50 XM/XMO monitor clean and maintaining proper operation

Ranked causes

1. Dust, dirt, or improper cleaning causing equipment degradation (common)

First check

Inspect monitor exterior for dust and dirt accumulation

Test point: All external surfaces
Expected: Clean, free of dust and dirt

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

Calibration: NIBP accuracy

Monitor displayed pressure differs from reference manometer value after NIBP repair or annually

Ranked causes

1. NIBP module requires calibration after repair or annual service (common)

First check

Enter calibration mode

Test point: Monitor calibration menu
Expected: Calibration mode entered

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

Calibration: NIBP leakage

NIBP system pressure drops excessively during 60-second hold test

Ranked causes

1. NIBP module leakage exceeds acceptable limit (occasional)

First check

Enter calibration mode

Test point: Monitor calibration menu
Expected: Calibration mode entered

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

Calibration: NIBP leakage test caution

NIBP system pressure hold verification; pressure drops excessively during 60-second hold period indicating air leak

Ranked causes

1. Air leak in NIBP circuit or tubing (occasional)

First check

Measure NIBP system pressure retention over 60 seconds

Test point: Gauge pressure measurement
Expected: Pressure drop less than 6 mmHg in 60 seconds, < 6 mmHg drop per 60 seconds
Tools: Test gauge, pressure transducer

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

Calibration: NIBP linearity

Monitor pressure reading accuracy at mid-range (150 mmHg) differs from reference manometer

Ranked causes

1. NIBP module linearity drift requires calibration (occasional)

First check

Enter calibration mode

Test point: Monitor calibration menu
Expected: Calibration mode entered

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

Calibration: NIBP performance assurance patient safety

Verification that non-invasive blood pressure measurement functions correctly

Ranked causes

1. Routine NIBP performance verification required (common)

First check

Schedule NIBP performance assurance testing

Test point: Equipment schedule
Expected: Once a year

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

Calibration: Performance assurance

Verification that the Series 50 XM/XMO monitor functions correctly per specification

Ranked causes

1. Routine calibration and performance verification required (common)

First check

Schedule performance assurance testing

Test point: Equipment schedule
Expected: Once a year (or as specified by local laws) and after repair where power supply is removed/replaced

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

Calibration: Preventive maintenance caution

Regular maintenance to ensure continued proper operation of the Series 50 XM/XMO monitor

Ranked causes

1. Routine preventive maintenance required (common)

First check

Schedule preventive maintenance

Test point: Equipment schedule
Expected: Once a year or after repair

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

Calibration: Safety testing patient safety

Verification that the Series 50 XM/XMO monitor meets safety standards

Ranked causes

1. Routine safety verification required (common)

First check

Schedule safety testing

Test point: Equipment schedule
Expected: Once a year

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

Cleaning the monitor caution

Maintain external surfaces free of dust and dirt to ensure proper functioning

Ranked causes

1. Dust and dirt accumulation on monitor surfaces (common)

First check

Visually inspect monitor external surfaces

Test point: All external surfaces including display
Expected: Clean, free of dust and dirt, no stains or damage

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

Data transmission failure with ERR77 patient safety

Error message ERR77 displayed with triple beep tone when fetal trace transmission fails after three retry attempts. Transmission stops and no further retries occur.

Ranked causes

1. Communication link failure or line noise (unknown)

First check

Verify fetal trace data stored in memory

Test point: Memory display after ERR77 acknowledgement
Expected: Two or three decimal dots permanently displayed (Series 50 A Dual shows three)

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

Error 'Err bAt1' displayed on trace caution

Battery low or empty of charge warning on LCD display

Ranked causes

1. Battery depleted or low charge (common)

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

Error 'Err PAP 30-240' displayed on trace

Incorrect paper type loaded; monitor expecting 50-210 scale

Ranked causes

1. Paper with 30-240 scale loaded instead of 50-210 scale (common)

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

Error 'Err PAP 50-210' displayed on trace

Incorrect paper type loaded; monitor expecting 30-240 scale

Ranked causes

1. Paper with 50-210 scale loaded instead of 30-240 scale (common)

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

Error 'Err xxx' displayed (500-600 range) caution

Technical failure detected by monitor self-test (xxx between 500-600)

Ranked causes

1. Hardware or firmware fault detected by self-test diagnostics (rare)

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

Error 'Error 601' displayed on trace

Paper speed incorrect

Ranked causes

1. Incorrect paper type or paper speed mechanism fault (occasional)

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

Error 'Error 602' displayed on trace

Incorrect paper type loaded

Ranked causes

1. Paper scale does not match monitor format setting (common)

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

Error 500 General Failure high voltage

Unidentified bus error condition; power on cover removed warning

Ranked causes

1. Unknown cause (bus error) (unknown)

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

Error 502 Power Supply Failure high voltage

Power supply board failure detected; electrical hazard present

Ranked causes

1. Power supply board malfunction (common)

First check

Check 24V AC output

Test point: Column A pins 32, 31
Expected: 27 to 36V rms, 27-36V rms
Tools: DVM

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

Error Err 1 displayed for Cardio 1 patient safety

Err 1 LED on Cardio 1 channel indicates wrong transducer connected

Ranked causes

1. Wrong transducer connected to Cardio 1 socket (common)

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

Error Err 1 displayed for Cardio 2 patient safety

Err 1 LED on Cardio 2 channel indicates wrong transducer connected

Ranked causes

1. Wrong transducer connected to Cardio 2 socket (common)

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

Error Err 101 displayed for Cardio 1 patient safety

Err 101 LED indicates FSpO2 patient module defective

Ranked causes

1. FSpO2 patient module hardware failure (rare)

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

Error Err 102 displayed for Cardio 1 patient safety

Err 102 LED indicates no communication between FSpO2 module and monitor

Ranked causes

1. FSpO2 patient module not communicating with monitor (occasional)

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

Error Err 103 displayed for Cardio 1 patient safety

Err 103 indicates FSpO2 sensor defective

Ranked causes

1. FSpO2 sensor failure or degradation (occasional)

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

Error Err 14 displayed for Cardio 2 patient safety

Err 14 LED indicates two FHR transducers used with single FHR option only

Ranked causes

1. Two FHR transducers connected when only single FHR option is installed (common)

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

Error Err 15 displayed for Cardio 1 or Cardio 2 patient safety

Err 15 LED indicates two FHR transducers used with single FHR option only

Ranked causes

1. Two FHR transducers connected when only single FHR option is installed (common)

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

Error Err 16 displayed for Cardio 1, Toco or Cardio 2 patient safety

Err 16 LED indicates wrong pairing of telemetry and transducers

Ranked causes

1. Telemetry mode active with incompatible transducer configuration (common)

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

Error Err 18 displayed

Err 18 indicates wrong paper type loaded in printer

Ranked causes

1. HP 8040 paper loaded instead of correct paper for this monitor (common)

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

Error Err 19 displayed caution

Err 19 indicates battery low or empty

Ranked causes

1. Battery depleted or low charge (common)

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

More symptoms

Error Err 2 displayed for Toco
Error Err 4 displayed for Cardio 2
Error Err 6 displayed for Cardio 1 or Cardio 2
Error Err 8 displayed for Cardio 1 or Cardio 2
Error Err 9 displayed for Cardio 1 or Cardio 2
Error message displayed after power-on self-test
Fatal error during startup
Front End Board errors 501/511/512/516/517
FSpO2 monitor displays data erratically or not at all
FSpO2 setting incorrect
Incorrect SpO2 or Temperature measurements
Incorrect voltage setting on rear panel
Mat.HR 0 and Mat.SpO2 0% values printed on trace
Message 'nop' displayed for Cardio 1 or Cardio 2
NBP warning 'artifacts' message
NBP warning 'cuff tubing' message
NBP warning 'NBP error' message
NBP warning 'overpressure' message
NIBP overpressure safety mechanism test
No FSpO2 annotation after Rec On in Toco grid
No MHR measurement printed on trace
Non-fatal error displayed
Not all maternal NIBP measurements printed on trace
Over-voltage condition detected
Parameter test signal failure
Power Supply error 502
Quick test display failure
Receiver self-test indicator lights
Recorder display test failure
Recorder paper advance malfunction
Recorder test pattern defect
Replace fuse
Replace fuses
Replace maternal display panel assembly
SpO2 display shows '---%' with no audible alert
SpO2 warning 'SpO2 artifacts' message
SpO2 warning 'SpO2 light interference' message
SpO2 warning 'SpO2 no pulse' message (NOP display)
Stepper motor replacement
System voltage incorrectly set
Test pattern printing defect on thermal head
Toco parameter test fails
Transducer cannot be immersed in water during use
Transmission INOP light illuminated
Transmitter VCXO replacement
Upgrade key installation and software upgrade procedure

46 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`501`	Front End Board error		error
`502`	Power Supply error		error
`510`	Recorder Board error		unknown
`511`	Front End Board error		error
`512`	Front End Board error		error
`516`	Front End Board error		error
`517`	Front End Board error		error
`531`	Combined Interface Board error	Combined Interface Board malfunction	error
`532`	Modem Interface Board fault	Modem interface board malfunction or communication error	error
`533`	Dual Serial Interface Board failure		error
`534`	Maternal SpO2 Board failure		error
`535`	NIPB Board failure		error
`536`	Telemetry Interface Board failure		error
`540`	Fetal SpO2 Board failure		error
`601`	Paper feed error	Motor fails to advance paper or paper does not stop at perforation line	error
`602`	Incorrect paper type error	Paper loaded is not Z-fold type or paper specifications do not match recorder requirements	warning
`610`	No Loudspeaker	Loudspeaker disconnected, failed, or not detected by system	warning
`611`	Loudspeaker error	Loudspeaker malfunction or disconnection	unknown
`77`	Modem transmission failure	Modem unable to transmit	error
`artifacts`	Patient movement detected during NIBP	Motion artifact detected during blood pressure measurement	warning
`cuff tubing`	NIBP tubing obstruction or malfunction	Cuff inflation/deflation takes too long	warning
`Err 1`	Wrong transducer type connected	Incorrect transducer plugged into Cardio 1 or Cardio 2 socket	warning
`Err 101`	FSpO2 patient module defective	FSpO2 module malfunction detected	error
`Err 102`	Communication error: FSpO2 module not connected	No response from FSpO2 module	error
`Err 103`	FSpO2 sensor defective	Sensor malfunction detected by module	error
`Err 11`	Wrong transducer in the US2/ECG socket	Incorrect transducer connected to US2/ECG port	error
`Err 14`	Two FHR transducers with single FHR option	Multiple FHR transducers connected with single option active	warning
`Err 14`	US Toco - Incorrect transducer connected	Incompatible or unsupported transducer connected to transmitter	error
`Err 15`	Two FHR transducers with single FHR option	Multiple FHR transducers connected with single option active	warning
`Err 16`	Wrong pairing of Telemetry and transducers	Telemetry receiver paired with incompatible transducers	error
`Err 16`	US Toco - Transducers connected to front panel	Transducers simultaneously connected to monitor front panel and telemetry system	error
`Err 16`	Wrong pairing of telemetry and transducers	Incompatible telemetry and transducer configuration	warning
`Err 18`	Wrong paper type loaded	HP 8040 paper used in this monitor	info
`Err 18`	Incorrect type of paper loaded	Wrong paper type inserted	warning
`Err 19`	Battery low or empty	Battery charge depleted	warning
`Err 19`	Battery low or empty	Battery voltage dropped below operating threshold	warning
`Err 2`	Wrong transducer in Toco socket	Incorrect toco transducer connected	warning
`Err 21`	Wrong Toco transducer in the Toco socket	Incorrect transducer connected to Toco port	error
`Err 4`	US/MECG Combi transducer not allowed in socket	Combi transducer in Cardio 2 socket	warning
`Err 41`	US/MECG Combi transducer not allowed	Combi transducer connected to incompatible socket	error
`Err 500`	General failure	Unspecified system failure	critical
`Err 500`	Not known (bus error)		error
`Err 501`	Front End Board failure (Single Ultrasound model)	Front End Board malfunction	critical
`Err 502`	Power Supply Board current limits out of specification	During power supply board current limit check at startup	error
`Err 502`	Power supply board		error
`Err 503`	CPU Board self-test failed	During power-on or periodic self-test sequence on CPU Board	error
`Err 504`	DSP-CPU		error
`Err 505`	DSP-CoP		error
`Err 506`	ROM Board		error
`Err 507`	DSPII Board		error
`Err 510`	Recorder Board failure	Recorder Board malfunction	critical
`Err 511`	Front End Board failure (Dual Ultrasound model)	Front End Board malfunction	critical
`Err 512`	Intrapartum Board failure	Intrapartum Board malfunction	critical
`Err 513`	Front End Board failure (Single Ultrasound model)	Front End Board malfunction	critical
`Err 513`	CPU Board (Smartwand)		error
`Err 515`	Dig If Board		error
`Err 516`	Frontend Board		error
`Err 517`	Frontend Board		error
`Err 525`	LED Board		error
`Err 526`	LCD Board		error
`Err 527`	LED Board		error
`Err 531`	Telemetry Board		error
`Err 531`	Combined Interface Board failure	Combined Interface Board malfunction	critical
`Err 532`	Interface board failed	Modem interface board hardware failure	error
`Err 532`	OBMS Interface Board		error
`Err 5326`	Modem Interface board failure	Board malfunction detected	critical
`Err 533`	DSIF Board		error
`Err 534`	Maternal SpO2 Board		error
`Err 535`	NBP Assembly		error
`Err 536`	Combined Telemetry/System Board		error
`Err 540`	Fetal SpO2 Board		error
`Err 6`	Wrong pairing of transducers	Incompatible transducers connected simultaneously	warning
`Err 601`	Recorder Paper Feed		warning
`Err 601`	Paper feed failure	Paper feed mechanism malfunction	error
`Err 602`	Incorrect paper type loaded	Paper with wrong scale or incorrect setting	warning
`Err 602`	Incorrect Type of Paper		warning
`Err 610`	Speaker system failure	No loudspeaker or blown fuse	error
`Err 611`	Wrong loudspeaker impedance	Incorrect speaker impedance	error
`Err 70`	PCMCIA card modem not responding	Modem interface module option failure	error
`ERR70`	PCMCIA modem error - modem defective, incorrectly installed, incompatible, or interface board faulty	Modem initialization or detection fails during system startup or barcode Transmit Data operation	error
`Err 706`	Modem not responding	No communication from modem module	error
`ERR77`	Data transmission failure - fetal trace transmission unsuccessful after three retry attempts	Barcode Transmit Data scanned when transmission fails; occurs after automatic retries exhausted	warning
`Err 77`	Error during data transmission	Data transmission failure, probably due to external sources	error
`Err 77`	Telephone transmission failed	Fetal trace transmission attempt fails	error
`Err 776`	Telephone transmission failure	Failed to transmit data via modem	warning
`Err 8`	Dual Ultrasound Twins option not fitted	Two US transducers connected without option installed	warning
`Err 800`	Software error: checksum wrong or download incomplete	Corrupted or incomplete software	critical
`Err 820`	Upgrade Key for different monitor type	Upgrade key not compatible with this monitor	error
`Err 888`	No software upgrade done	Transducers or telemetry still connected during upgrade	warning
`Err 9`	Invalid Telemetry mode	Telemetry system communication error	error
`Err 9`	Invalid telemetry mode	Telemetry receiver not properly connected or configured	error
`Err 9`	US Toco - Invalid telemetry mode	Telemetry system detects invalid mode during ultrasound or toco monitoring	error
`Err bAt1`	Battery low or empty	Battery voltage dropped below operating threshold	warning
`Err bAt / Err 19`	Battery low or empty	Battery voltage drops below operating threshold on power-up	warning
`Error 533`	Dual Serial Interface Board error	Dual Serial Interface Board malfunction	error
`Error 534`	Maternal SpO2 Board error	Maternal SpO2 Board malfunction	error
`Error 535`	NIBP Board error	NIBP Board malfunction	error
`Error 536`	Telemetry Interface Board error	Telemetry Interface Board malfunction	error
`Error 540`	Fetal SpO2 Board error	Fetal SpO2 Board malfunction	error
`Error 601`	Recorder Paperfeed error	Recorder paper feed malfunction	error
`Error 601`	Paper speed incorrect	Paper advance speed outside specification	error
`Error 601`	Paper speed error	Measured paper advance speed does not match expected	error
`Error 602`	Incorrect paper type loaded	Paper scale does not match monitor configuration	warning
`Error 70`	Modem Not Responding		unknown
`Err PAP2 / Err 18`	Incorrect type of paper loaded	Wrong paper detected during operation	warning
`Err PAP 30-240`	Incorrect paper type loaded	Paper with 50-210 scale loaded when 30-240 expected	warning
`Err PAP 30-240 / Err 6025`	Incorrect paper type for 30-240 scale	Paper with wrong scale loaded	error
`Err PAP 50-210`	Incorrect paper type loaded	Paper with 30-240 scale loaded when 50-210 expected	warning
`Err PAP 50-210 / Err 6025`	Incorrect paper type for 50-210 scale	Paper with wrong scale loaded	error
`Err xxx`	Technical failure detected by self-test	Self-test program detected system malfunction where xxx is 500-600	critical
`FAILED !`	NIBP calibration failed to complete successfully	Pressure reading at 220 mmHg not exact or unstable during Store Cal step	error
`NBP error`	NIBP hardware or tubing failure	Hardware or tubing failure detected	error
`nop`	No contact or poor contact with reference electrode	Inadequate electrode-to-skin contact during MECG measurement	warning
`nop`	No contact or poor contact in ECG system	Electrode contact issue or disconnected cable	warning
`overpressure`	NIBP cuff pressure excessive	Cuff pressure exceeds 330 mmHg or remains above 300 mmHg for 2 seconds	warning
`SpO2 artifacts`	Pulse artifacts detected by SpO2 sensor	Irregular pulse patterns detected from patient movement	warning
`SpO2 light interference`	Ambient light interfering with SpO2 measurement	Light source intensity too high for SpO2 measurement	warning
`SpO2 low signal`	SpO2 signal weak or poor quality	Weak SpO2 signal detected	warning
`SpO2 no pulse`	No pulse detected by SpO2 sensor	Pulsation too weak or not detected; transducer mispositioned	warning

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

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