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www.spacelabshealthcare.com
I - I I I
Digital PCBA ........................................................................................................... 3-26
Modular Receiver Housing........................................................................................3-27
RF Signals ................................................................................................................ 3-27
90479-A Modular Receiver Housing ...............................................................3-27
90479-B/C Modular Receiver Housing ..........................................................3-28
Analog Output ....................................................................................................... 3-28
Power Supply ......................................................................................................... 3-28
Power Supply Functional Description ........................................................... 3-29
AC Input Module ......................................................................................................3-29
AC Input Rectifier and Filter ...............................................................................3-29
100 kHz DC-to-DC ................................................................................................. 3-30
Switcher Feedback Power .................................................................................. 3-30
Gate Drive Transformer ....................................................................................... 3-30
Main Isolation Transformer ................................................................................. 3-30
Secondary Side ....................................................................................................... 3-30
Battery Disconnect ................................................................................................ 3-30
Over/Under Voltage Shutdown .........................................................................3-31
DC ON/OFF ................................................................................................................3-31
+5 V, +12 V, and -12 V DC-to-DC Converter ...................................................3-31
LED/AC Operation ..................................................................................................3-31
Overview............................................................................................................................. 4-1
Cleaning/Disinfecting ................................................................................................... 4-2
Physical Inspection ........................................................................................................ 4-3
Transmitter ................................................................................................................ 4-3
Receivers ................................................................................................................... 4-3
Housing ...................................................................................................................... 4-3
Antenna System Inspection .......................................................................................4-4
Preventive Maintenance ..............................................................................................4-4
Antenna System ...................................................................................................... 4-4
Safety Verification ......................................................................................................... 4-5
Current Leakage Measurements (90479-A/B/C only) .............................. 4-6
Battery Backup Test .....................................................................................................4-6
To conduct the module housing battery backup test...............................4-6
Battery Disposal.............................................................................................................. 4-7
Disassembly/Assembly of the Receiver Module................................................ 4-7
Disassembling the Receiver Module ................................................................ 4-8
Assembling the Receiver Module .................................................................... 4-10
Disassembling/Assembling the Module Housing ...................................... 4-10
To replace the internal power backup battery .......................................... 4-10
To remove the module housing top cover ....................................................4-11
To remove the power supply from the module housing .........................4-11
To remove the RF Amplifier PCBA..................................................................4-12
Disassembling the 90347 and 90341 Transmitters ................................... 4-12
To remove the ECG and transmitter PCBAs................................................4-12
