Philips Trim 1 Service Manual

							High Level ECG Data Flow and StorageTheory of Operation
PageWriter Trim Cardiograph Service Manual2-7
Figure 2-2 ECG Flow and Storage 
						

							Theory of OperationHigh Level ECG Data Flow and Storage
2-8PageWriter Trim Cardiograph Service Manual
Internal Main Archive
The internal main archive resides on the internal CompactFlash (CF) card, and is used as the 
primary ECG data repository. This archive is referred to as the 
Main Archive in the software 
application. ECG XML files and related index files are stored here in the 
RubyArchiveInternal 
directory. All stored ECG files transition through this archive prior to transfer or copying to 
other devices, such as the PC card.
Currently, the internal main archive is limited to storing the following maximum number of 
ECGs.
NOTEThe PageWriter Trim I cardiograph does not provide internal storage. 
Internal Remote Archive
The internal remote archive resides on the internal CompactFlash (CF) card much like the 
internal main archive. All XML files retrieved from remote sites, such as the TraceMasterVue 
ECG Management System, reside in this archive until deleted. ECG XML files and related 
index files are stored in the 
RubyArchiveRemote directory.
Currently, the internal remote archive is limited to a maximum of 100 ECGs.
NOTEThe PageWriter Trim I cardiograph does not provide an internal remote archive.
External PC Card Archives
The external PC card archives reside on a compatible PC card inserted into the PC card slot. 
Files may then be transferred to inserted cards using the Archive feature of the application 
software, and are stored in XML format. An index file is created and maintained on each PC 
card when CDB files are transferred or copied from the card. 
NOTEThe PageWriter Trim I cardiograph does not offer an external storage option.
Currently, an external PC card archive is limited to storing the following maximum number of 
ECGs.
Table 2-2 Maximum Number of ECGs Stored (Internal Main Archive) 
Model Maximum Number of ECGs Stored
Trim I No storage capability - 0
Trim Rx 200
Trim III 150
Trim II 50
Table 2-3 Maximum Number of ECGs Stored (External PC card) 
Model Maximum Number of ECGs Stored
All models but Rx 150 
						

							High Level ECG Data Flow and StorageTheory of Operation
PageWriter Trim Cardiograph Service Manual2-9
NOTEWhen you add or delete compatible ECG XML files from a PC card (not using the PageWriter Trim), 
it is recommended that you delete all CDB files prior to reinserting the PC card into the cardiograph. 
In the absence of an index file, the cardiograph automatically regenerates the index based on the XML 
files on the PC card.
External USB Flash Memory Stick Archives
The external USB flash memory stick archives reside on a compatible memory stick 
connected to the USB port. Files can then be transferred to a connected memory stick using 
the 
Archive feature of the application software, and are stored in XML format. An index file is 
created and maintained on each compatible memory stick when CDB files are transferred or 
copied from the stick. Currently, an external memory stick archive is limited to storing the 
following maximum number of ECGs as listed in Table 2-4.
NOTEThe PageWriter Trim cardiograph only supports the USB memory stick that is shipped with the 
cardiograph, or that is available for purchase as an optional accessory from Philips Medical Systems. 
Philips does not guarantee that other USB memory sticks are compatible with the PageWriter Trim 
cardiograph.
NOTEWhen you add or delete compatible ECG XML files from a memory stick (not using the cardiograph), 
it is recommended that you delete all CDB files prior to reconnecting the memory stick to the 
cardiograph. In the absence of an index file, the cardiograph automatically regenerates the index based 
on the XML files on the memory stick.
Rendered ECG Report Prints
A rendered ECG report print is a hard copy representation of the ECG data. This includes a 
high-resolution print of the signal data, and may include configured patient demographics, 
acquisition information, and other non-signal data elements. 
The PageWriter Trim allows the user to customize the fields on an ECG report print. The 
report print may consist of one or more continuous pages on perforated thermal media from 
the printer.Trim Rx 200
Table 2-3 Maximum Number of ECGs Stored (External PC card) (continued)
Model Maximum Number of ECGs Stored
Table 2-4 Maximum Number of ECGs Stored (External USB Flash Memory Stick)
Model Maximum Number of ECGs Stored
All models except Rx 150
Trim Rx 200 
						

							Theory of OperationHigh Level ECG Data Flow and Storage
2-10PageWriter Trim Cardiograph Service Manual
Figure 2-3 Rendered ECG Report Print Sample
Fax-Rendered ECG Report Print
A fax-rendered ECG report print is equivalent to the rendered ECG report print, as described 
in the previous section, except it has been adjusted to comply with fax transmission and 
resolution device requirements. When the user starts a fax transfer, the ECG report is rendered 
and transmitted to a remote receiving fax machine that has been pre-configured on the 
cardiograph, using the optional fax and modem PC card. The fax-rendered ECG report print 
may be stored on the received system end as an electronic file, and not actually used to 
produce a printed copy.
NOTENo guarantee is made as to the suitability of the faxed 12-lead ECG for any particular purpose, due to 
the variability inherent in fax technology. 
  WARNINGDo not connect the modem card to a phone line when the cardiograph is connected to a 
patient. 
						

							Power System OverviewTheory of Operation
PageWriter Trim Cardiograph Service Manual2-11
Power System Overview 
The PageWriter Trim cardiograph power system consists of:
„A 65-watt AC/DC medical grade power module
„One 12 volt, 2.9 amp-hour lead-acid rechargeable battery
„A power supply board which includes battery charging circuitry, various voltage 
regulators, and logic circuitry to provide for battery operation
The PageWriter Trim cardiograph is designed to run primarily on battery power, using AC 
power for the purpose of recharging the battery. The power board contains a battery charging 
chip that controls battery charging. The main board has an A/D converter that monitors the 
voltage of the power supply, and a Board Status Register (BSR) that monitors the battery 
charging status. 
The major power draws within the PageWriter Trim cardiograph are the LCD display 
backlights, which can draw up to 4 watts, and the thermal printer, which can draw 
approximately 48 watts. Provisions have been incorporated into the PageWriter Trim 
cardiograph that allow the user to adjust the display brightness. To extend battery life, set the 
display brightness to the low or medium setting. Also, activate the power save mode (dims the 
screen) to further extend battery life. The printer control board is current-limited for normal 
printing. However, if print demand is too high, the current limiter will not print the output, 
resulting in a faded page. For more information on configuring power saving options on the 
cardiograph, see Chapter 2 “Configuration” of the PageWriter Trim Cardiograph Instructions 
for Use, available for download from the Philips InCenter site (
incenter.medical.philips.com).
Battery
The 12V recharged sealed lead-acid battery provides power to the PageWriter Trim 
cardiograph. The battery provides a high-current discharge as needed for thermal printing. 
Built-in protection circuitry in each pack prevents damage to the battery by overcharging, over 
discharging, over current, and over temperature. 
						

							Theory of OperationPower System Overview
2-12PageWriter Trim Cardiograph Service Manual
Figure 2-4 Power System Block Diagram
Power Labels 
The following represent the various power labels used on the PageWriter Trim cardiograph.
Vin 
The DC voltage direct from the AC power. The voltage level is between 17.10V and 18.90V, 
with a maximum power output of 65 watts. This voltage is monitored.
VB+_T (Battery information)
The battery voltage range is between 10.0V and 14.8V. Discharge current is limited to a 
continuous 2.9 amps, with a 4.0 amp limit for short periods. This voltage is monitored.
VO
The voltage will be supplied by Vin and battery. Its range is between 10.0V to 18.90V. The 
voltage is monitored. 
Power Board
Battery Pack
AC Input
AC
DC
DC OutputBattery
Voltage
Charger
+5VP
+3.3V
+3.3
VB_P
Vcore
(+1.86v)
VPH
(+26V)
P
ro
v
id
e 
P
ow
er
 t
o
 M
ai
n 
B
oa
rdCharger
Status
Main BoardA/D
monitor
Power Supply Con
On/OFF
Contol 
						

							Power System OverviewTheory of Operation
PageWriter Trim Cardiograph Service Manual2-13
+3.3V 
Output from the U113 (power board) regulator. This switching regulator will supply 3.3V at 
up to 4.25A of current. This voltage is monitored.
+3.3VB_P 
Output from U111 (power board) regulator, an MIC5233, for the real timer and power 
sequence circuit. The voltage level is 3.3V, and can provide up to 100mA of current. This 
voltage is not monitored.
VDDX 
Output from +3.3V through a  filter, which is the primary power for the main system 
processors and memory. The voltage level is 3.3V. This voltage is monitored. 
Vcore (+1.86V)
Output from the U105 (power board) circuit, an LTC1627, which is 1.86V core power for the 
main system processor. The input to this regulator is from the 3.3V supply, and can supply up 
to 500mA of current. This voltage is monitored. 
+5VP
Output from the U101(power board) circuit, an LTC1374, which supplies all the 5.00V power 
to the system. Input is from V0, and output is 5.00V with a maximum current of 4A. This 
voltage is monitored.
USB_VCC 
Output from the U303 (main board) circuit, an MIC2503, which supplies the barcode reader 
and other external USB device. Input is from +5V, and output is +5V with maximum current 
of 500mA. This voltage is monitored.
VPH
Output from the U108 (power board) circuit, an LM2588, which supplies +26V power to the 
printhead. It is controlled by printer MCU, MCF5272, which is located on main board. VPH 
provides power only when a print session starts. Otherwise, VPH does not provide power. 
This voltage is monitored by MCF5272.
π 
						

							Theory of OperationPower Management
2-14PageWriter Trim Cardiograph Service Manual
Power Management 
Battery Charging Logic 
The system host processor controls several functions of the power system. These include:
„Activating sleep mode if no activity is detected for a preset period of time.
„Restricting the user from printing when the charge capacity reaches preset levels. 
„Alerting the user when maintenance is needed for the battery. 
Battery Gauge 
The battery gauge on the PageWriter Trim II, III and Rx cardiographs consists of four 
segments. When the battery is fully charged, all four segments are displayed. 
The battery gauge on the PageWriter Trim I LCD display consists of two icons. It appears in 
the upper right corner of the LCD. 
NOTEThe battery gauge may not always accurately reflect the true charge state of the battery due to the age 
of the battery, or due to failure to perform specified battery maintenance.
Table 2-5 and Table 2-6 describe the different battery level indicators for all models of the 
PageWriter Trim cardiograph. 
						

							Power ManagementTheory of Operation
PageWriter Trim Cardiograph Service Manual2-15
 
Table 2-5 PageWriter Trim I Battery Status Indicator
Battery Level Status Indicator
Fully Charged Battery
50% power capacity
Low Battery Power
Low Battery Alert 
No or Dead Battery
Battery is charging 
Table 2-6 Trim II/III/Rx Battery Status Readings 
Battery Level Status Indicator
Fully Charged Battery
75% power capacity
50% power capacity
Low Battery Power
Low Battery Alert 
(alternate icons flashing)
No or Dead Battery 
						

							Theory of OperationPower Management
2-16PageWriter Trim Cardiograph Service Manual
Battery Discharging
When the battery is discharged to the 30% level, the PageWriter Trim cardiograph disables 
high-demand printing, and continues to allow the battery to be discharged to a 20% level. 
When the 20% level is reached, the PageWriter Trim cardiograph disables printing, and warns 
the user to plug in the AC power cord. If the AC power cord is not plugged in within three 
minutes, the PageWriter Trim cardiograph automatically shuts down. 
NOTEThe battery will continue to discharge when the cardiograph is not in use, or if the battery is stored 
outside of the cardiograph.
Battery Charging
When the AC power cord is plugged in, the battery begins to charge. Check the charging status 
on the Board Status Register (BSR).
Charge Current
When the cardiograph is in active operating mode, the charge current is 580mA. When the 
cardiograph is in Standby (power save) mode, the charge current depends on the battery. The 
initial charge is approximately 580mA in bulk charger status. When the voltage is up to 
approximately 14.6V, the current is slowly reduced to approximately 100mA over time as it 
enters floating charging.
Battery Information
Battery information is sent from the battery charger, UC3909. This information is then sent up 
to the host processor via BSR, and can be viewed from the Biomed Service Utility screen. For 
more information, see “About the Trim II/III/Rx Biomed Service Utility” on page 4-6. Battery is charging 
(moving bars)
Table 2-6 Trim II/III/Rx Battery Status Readings (continued)
Battery Level Status Indicator