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...

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...

Theory of OperationHigh Level ECG Data Flow and Storage
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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...

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...

Theory of OperationPower System Overview
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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...

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...

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...

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
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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...