Welch Allyn ELI 150, Service Manual

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Technical Description
Introduction ............................................................................................................................ 5-1
ELI 250/210 Block Diagram ................................................................................................... 5-2
Main System Board ............................................................................................................... 5-3
Front End Board .................................................................................................................... 5-3
Patient Input. .......................................................................................................................... 5-4
ELI 250/210 Specifications .................................................................................................... 5-5
Parts List ................................................................................................................................ 5-6
Troubleshooting and Testing
Introduction ............................................................................................................................ 6-1
Troubleshooting ..................................................................................................................... 6-1
AC Power, Backlight on, Nothing on Display ............................................................... 6-1
With AC On, Nothing on Display .................................................................................. 6-1
Unit Works on AC but not on Battery ........................................................................... 6-1
Unit turns on, No waveform on screen but Function Keys Displayed .......................... 6-2
No Keyboard Functions and Display Frozen ............................................................... 6-2
RS232 Transmit / Receive Problems ........................................................................... 6-2
Optional Modem Transmit / Receive Problems ........................................................... 6-3
Testing ................................................................................................................................... 6-4
Power Supply Test ....................................................................................................... 6-4
Keyboard test ............................................................................................................... 6-4
LCD Test ...................................................................................................................... 6-4
Speaker Test ................................................................................................................ 6-5
Date / Time Test .......................................................................................................... 6-6
Writer Test ................................................................................................................... 6-6
Writer Test Description ........................................................................................ 6-7
Adjusting the Writer Cue Sensor ................................................................................. 6-8
ECG Test ..................................................................................................................... 6-8
Noise Test .................................................................................................................... 6-9
Lead Fail Test .............................................................................................................. 6-10
Transmitting Records ................................................................................................... 6-11
Serial Port Test ................................................................................................... 6-12
Modem Test ....................................................................................................... 6-12
Modem Initialization.................................................................................. 6-12
Country Codes ......................................................................................... 6-14
Receive ECGs .................................................................................................... 6-14
WLAN Test ......................................................................................................... 6-15
Safety Test ......................................................................................................... 6-16
Connectivity Options
Introductions .......................................................................................................................... 7-1
RS232/Serial Connectivity Option ............................................................................... 7-1
Modem Connectivity Option ......................................................................................... 7-1
LAN Connectivity Option .............................................................................................. 7-2
GSM Modem Connectivity Option ............................................................................... 7-3
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