General Check Procedures - Schiller AT-2plus Manual

SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002

General Check Procedures

The procedure detailed here is a general confidence check of the unit after an internal module or
board has been replaced. It is not a full functional test (which can only be carried out with dedicated
equipment in the factory) but is intended to provide a general confidence check in all the major
AT-2plus functional areas. The instructions given here are guides to the basic functions. If more
operating information is required (general settings, comprehensive menu guides etc.) please refer
to Chapter 1 in this publication or the relevant User Manual for the software version applicable.
Test Procedure
Connect unit to mains supply.
Switch the unit on by pressing the
ON key on the keyboard.
Connect an ECG simulator to the
ECG connector on the side panel
and switch ON.
Press the MAN Start key.
Press AUTO START and wait
approximately 10 seconds for the
printout to commence.
Switch the unit OFF and leave
connected to the mains supply for
10 hours or more to charge the
battery.
Disconnect the mains and switch
the unit ON.
Run the unit on battery power for
approximately an hour.
Run the unit more than 8 hours on
battery power (AT-2plus Memory
4 hours).
Printer problems - see next page.
Result
Mains indicator (LED) is lit.
If no ECG simulator is connected, a short
audible alarm is generated and the lead
indications in the display are flashing..
LCD screen comes on and shows three
ECG traces and a number of status
indications.
ECG traces are barely visible
No traces visible on the LCD screen.
Three ECG traces, heart rate, sensitivity,
time scale and status of lead connections
are shown on the screen.
Six leads are printed and are of good
quality.
A preprogrammed printout is produced.
Battery symbol is shown on the LCD
screen.
Unit fully operational. No degradation.
Battery symbol flashes.
Corrective action if result not OK
Check mains fuse on the back panel and
replace if necessary.
If problem remains, replace main board MK
14-10.
Ignore or connect ECG simulator
Check power board, ECG and main board.
Open the unit and check that the two wire
connection from the power supply to the
LCD assembly is properly connected (high-
voltage backlight). If problem remains,
replace LCD assembly.
Check that the signal cable from the main
board to the LCD assembly is properly
connected. If problem remains, check LCD
assembly, power, ECG and main board.
If a lead alarm is flashing, check that the lead
is properly connected
If not, reset to default settings and try again.
Open the case and inspect all cable
assemblies and connectors.
Check printer alignment. Run printer test (see
next page).
Check / replace printer motor.
Replace main board MK 14-10.
Replace paper tray and complete printer
assembly.
If not as programmed, check all settings. If
problem remains, replace main board MK
14-10.
If not, check battery and replace if
necessary.
Chapter 3
Fault Diagnosis
Page 3.3