The platform: main unit, measurement modules, X2, network and power
Identify an IntelliVue MX400, MX450, MX500 or MX550 and its attached measurement devices, name the boards in the main unit and what each one carries, and know where settings, trends, logs and patient data live.
One family, four sizes
The MX400, MX450, MX500 and MX550 are one hardware platform in four housings. What changes between them is the screen size and what is built into the case. The MX400 has the smallest panel, a 9-inch display, and can carry an internal recorder. The MX450 has a 12-inch display and can also take the recorder. The MX500 has the same 12-inch display as the MX450 but replaces the recorder space with an integrated three-slot rack for plug-in modules. The MX550 has a 15-inch display and the same three-slot rack. All four are operated mainly by touch; a remote control, a USB mouse, trackball or keyboard can be added.
When you arrive at a monitor, identify it properly before anything else. The product number is shown on the revision screen in the main setup menu: 866060 for the MX400, 866062 for the MX450, 866064 for the MX500 and 866066 for the MX550. The same screen gives the software revision of the monitor and of every attached measurement device, and the system serial number is also printed on the front of the unit. Write all of it on the job sheet. Half of the decisions in later lessons depend on which release you are on and which hardware revision the measurement module has.
The service guide this course follows is written for release K.2 of the software. Earlier and later releases exist, and other IntelliVue families such as the older MP monitors, the larger MX700 and MX800, and the newer X3 share concepts with this platform. Their boards, tests and limits are not the same; use their own documentation.
Inside the main unit
The main unit is a display and processing computer with no patient electronics of its own. Mains enters through the AC inlet with its cord clamp and goes to an AC/DC power supply that isolates the system from the mains and produces a single 15 V rail. That rail is distributed to everything else, either directly or through further converters. The battery charger takes its feed from the same 15 V and switches the system between mains and battery when the cord is pulled or reconnected. A separate isolating DC/DC converter makes the supply that powers the measurement link to the measurement modules.
The main board is the digital heart: the processor with its integrated graphics and USB controller, main memory, a system FPGA and a system controller with the watchdogs. The interfaces for the measurement link, the internal recorder and the ECG output are on it as well. Small serial EEPROMs hold system information that the software reads at start-up to configure itself, which is why the manufacturer requires the hardware serial number to be loaded again after several boards are changed, as you will see in lesson 5.
Around the main board sit the boards you will actually replace. The standard system interface board takes the supply from the AC/DC unit and carries the battery interface and charger; it is also involved in internal communication and several external interfaces, which is why it appears in so many troubleshooting tables. The panel adapter board drives the LED backlight and connects the touch screen; on the MX400 it also carries the alarm lamps, while the larger models have a separate alarm LED board in the top of the bezel, which also holds the ambient light sensor. The power switch and ECG sync out board carries the power button, the speaker connection and the analogue ECG and sync output. The MSL board carries the connector for the measurement link cable. Options add boards: the advanced system interface board for an RS232 port with 5 V supply, nurse call and extra USB; one or two I/O slots that take a flexible nurse call relay board, a dual MIB/RS232 board or an IntelliBridge EC10 board; a WLAN board or an IntelliVue Instrument Telemetry (IIT) board, never both; a short range radio board for the wireless remote control; the recorder board on the MX400 and MX450 and the rack board on the MX500 and MX550.
The measurements live outside: MMS, extensions and modules
Patient signals are acquired by measurement servers, not by the main unit. The core one is the M3001A Multi-Measurement Module, the MMS. Every MMS measures ECG with respiration, SpO2 and NBP. Options add a combined invasive pressure and temperature channel and 12-lead ECG. The SpO2 technology is fixed by an option in the module: Philips FAST SpO2, Masimo SET or Nellcor OxiMax. This matters on the ward, because sensors are only compatible with the technology inside that module. The rear label shows the serial number prefix and the option string, and together they tell you the hardware revision; revisions A and B are no longer supported by the manufacturer, revision C is current.
An MMS can be extended. Extensions dock under the MMS on a dual link bar and share its connection to the monitor: the M3012A hemodynamic extension (pressure, temperature and, with an option, cardiac output), the M3014A capnography extension with mainstream or sidestream CO2, and the M3015A or M3015B Microstream CO2 extensions. On the MX500 and MX550 the internal rack takes up to three single-width plug-in modules, for example invasive pressure, cardiac output, SvO2, EEG, NMT or the M1116C recorder. The IntelliVue G1 and G5 gas analysers connect as external devices.
The M3002A IntelliVue X2 is a special case. Docked to the monitor it works like an MMS. It is also built to be used on its own, for example during transport; how it behaves then and how it is serviced are described in its own service guide and Instructions for Use, not in the MX guide. Newer devices such as the X3 play a comparable role; check the compatibility information for the release you service before assuming one is supported.
The measurement link and how data moves
The MMS talks to the monitor over the Measurement Link, MSL: an Ethernet-based internal network carried in one cable together with the power supply for the measurement devices. The internal network is time-synchronised so that waves from different servers stay aligned, and it reserves bandwidth so that real-time data always gets through. It is also plug and play: when you plug or unplug a server, the monitor detects it and reconfigures the screen. That is convenient on the ward and it is useful to you, because a measurement device can be moved to another monitor in seconds to prove which side a fault is on.
Inside the monitor, every piece of acquired data passes through one central data service, and all applications read from it. Trends are kept for up to 48 hours in a combination of battery-buffered memory and flash. The configuration profiles are stored in flash only. The buffered memory keeps its content for a while without mains, but not indefinitely; a monitor left unplugged for a long time can come back without its recent trend data. A few hardware settings, such as the role assigned to each RS232 port, the external video resolution and the keyboard language, are stored in the monitor itself and are not carried in a clone file. Remember that list when you replace a main board.
Network, central station and service tool
The wired network connector at the rear is colour-coded orange and connects the monitor to the Philips Clinical Network, where IntelliVue Information Centers and other monitors live. The monitor gets its address automatically, and switching between wired and wireless happens by itself when the network cable is plugged or unplugged. Wireless options are the 802.11 bedside adapter or IIT. The clinical network is a closed system with real-time guarantees; the general hospital LAN is not, and the two must not be confused when somebody wants to plug the monitor into the nearest wall socket.
For the central station to show the bed, the monitor must be associated with a sector. Depending on how the Information Center is set up, the central controls the label, or the label is set in the monitor and must match the one configured at the central. Two monitors carrying the same label is a classic cause of a bed that disappears from the central.
Philips Support Tool Mark2 is the manufacturer's Windows application for upgrading, configuring and diagnosing monitors and measurement devices over the network. It reads the full status log, makes and loads clone files, reloads software and loads the hardware serial number after a board change. It is used by authorised personnel with the proper access; this course describes what it is for, not how to obtain or bypass that access.
Power, battery and the rear panel
The supply accepts a wide range of mains voltages and both 50 and 60 Hz, so the same monitor works in most countries without a selector. The on/standby key does not separate the monitor from the mains; only pulling the plug does. The rear panel carries the AC inlet with its clamp, a protective earth screw point, the equipotential connector, the orange network socket, the video output, a USB socket and the slots for the optional boards.
The monitor takes one lithium-ion smart battery, the M4605A, in a compartment under a door. Smart means the pack has its own electronics and reports its charge, capacity, age and cycle count to the monitor. Three LEDs on the front tell the story before the screen does: AC power, the power on and error LED, and the battery LED. Learn their normal behaviour in lesson 4; they are your first diagnostic tool. If a running monitor loses its power, a separate power loss buzzer sounds for about a minute, so the loss does not go unnoticed; lesson 2 shows how it is tested.
- Identify the model by product number, not by screen size alone.
- Record monitor and MMS software revisions and the MMS option string.
- Note which SpO2 technology the MMS has before judging any sensor.
- Treat the trend, event and patient data in the monitor as patient data.
| Part | What it does | How it fails | |
|---|---|---|---|
| 01 | AC/DC power supply | Isolates the mains and produces the 15 V system rail | Dead monitor with mains present, AC LED dark; output out of tolerance |
| 02 | Main board | CPU, graphics, memory, FPGA, watchdogs, MSL, recorder and ECG out interfaces | Boot failures, red error LED, settings malfunction; carries system data |
| 03 | Standard system interface board | Supply input from the AC/DC unit, battery interface and charger, internal communication | Charger or battery malfunction INOPs, internal communication malfunction, low internal voltages |
| 04 | Panel adapter board | LED backlight drive and touch connection; alarm lamps on the MX400 | Dark screen after normal boot, touch dead, alarm lamps out |
| 05 | Alarm LED board (MX450/500/550) | Alarm lamps and the ambient light sensor | Check alarm lamps INOP, lamps dark, brightness not adapting |
| 06 | Power switch / ECG sync out board | Power key, speaker connection, analogue ECG and sync output | Will not switch on, no test sound, ECG out fault |
| 07 | MSL board and cable | Connects and powers the MMS, extensions and X2 | MMS does not start, bent or pushed-back pins, server link errors |
| 08 | LCD assembly and touch bezel | Display panel and touch screen | Lines, dark areas, touch offset or dead zones after impact |
| 09 | M3001A MMS | ECG/Resp, SpO2, NBP and optional pressure/temperature acquisition | Equipment malfunction INOPs, NBP leaks, damaged connectors |
| 10 | M4605A smart battery | Lithium-ion backup and transport power | Short run time, conditioning requests, malfunction or temperature INOPs |
Typical scenario: the sensors were right, the module was not
Typical scenario, not a recorded case. A ward reported that SpO2 on one MX450 showed sensor messages with every sensor they tried, while the same sensors worked on the neighbouring beds. The monitor had been fitted with an MMS borrowed from another department. The engineer read the option string on the rear label of the MMS: it carried a different SpO2 technology from the rest of the ward, and the sensors on the shelf belonged to the ward's usual technology. With an MMS of the ward's own type, every sensor worked. Nothing was faulty; the module and the sensors simply did not belong together.
On this platform the SpO2 technology belongs to the MMS, not to the monitor. Read the option string before you judge a sensor or a board, and keep modules and sensors matched per ward.
New gas module, missing agents: configuration decides
On a GE B650 monitor the gas analyser was replaced with an E-CAiO module. The new module calibrated and measured, but the screen showed only CO2 and O2; the anaesthetic agents never appeared. The engineer first suspected the module. A colleague recalled a similar case on a Cardiocap/5 where the monitor's settings, not the hardware, decided which gas parameters were shown, and a settings change on the monitor side brought them back. The case shows how often a module swap ends in a configuration question rather than a hardware fault.
On a modular platform, what appears on screen depends on the module, the monitor software and the configuration together. On an IntelliVue MX, check the revision screen, the compatibility of the software releases and any label conflict or configuration message before condemning a measurement device.
On-site checklist
- Model identified by product number on the revision screen
- Monitor software revision and system serial number recorded
- MMS, extensions, X2 and plug-in modules listed with serial numbers and revisions
- MMS option string read, SpO2 technology noted
- Optional boards present noted (I/O boards, WLAN or IIT, SRR, recorder or rack)
- Network connection type and equipment label noted
- Battery fitted, its age and cycle count noted
- Rear panel inspected: cord clamp, earth point, equipotential lead, connectors