Key Board Test - EDAN SE-601A Service Manual

SE-601 Series Electrocardiograph Service Manual

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.
Item
①
②
③
② T+5V
③ GND
1
① T3V3
1
Compare the measurement results with the reference results in the list. If any one of the
4)
results exceeds the reference range, the key board defection is confirmed. Replacement of the
key board is recommended.
Test point
T3V3
T+5V
- 42 -
Inspection and Troubleshooting
Reference result
3.3± 0.1V
5± 0.5V
GND