Key Board Test - EDAN SE-1200 Series Service Manual

SE-1200 Series Electrocardiograph Service Manual
⑤
3.3 V
5) Compare the measurement results with the reference results in the list. If any one of the
results exceeds the reference range, the ECG board defection is confirmed. Replacement of
the ECG board is recommended.

5.3.3 Key Board Test

To verify the key board,
1) Open the main unit following the procedures described in Chapter 6, "Electrocardiograph
Disassembly".
2) Switch on the device.
3) Measure the voltage to earth of the test points listed below by using a multimeter.
② V- ④ -2.5V ⑥ V+
Item Test point
①
T3V3
②
T+5V
③
① 5V ③ 2.5V
Reference result
3.3± 0.1V
5± 0.5V
GND
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Inspection and Troubleshooting