Page 35
Functional Checks
5
AT-10 plus
Service Handbook
Functional checks and tests
5.3
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5.3.2
Mains and battery indicators (LED) test
1. Connect the power cable at the rear of the unit.
– Check that the mains indicator lamp is lit
(1)
when the unit is connected to the
mains supply.
2. Switch the unit on.
– Check that the relevant symbol is displayed on the LCD (
3)
.
3. Disconnect the power cable.
– check that the mains indicator lamp switches off
(1)
– the battery lamp is lit
(2
).
– the battery symbol is displayed on the LCD
(4)
.
5.3.3
Charging the battery
1. Connect the device to the mains but do not switch it on.
2. The LED for mains supply
(1)
is lit.
3. Charge the battery for at least 8 hours.
5.3.4
Battery capacity check
Carry out the Battery capacity check as detailed in the service screen (see page 25).
5.3.5
Keyboard test
Check following items:
• Check the keyboard for mechanical damage and excessive wear. If any can be
seen, the keyboard must be replaced.
• Check all function keys for their proper operation. An acoustic confirmation ap-
pears whenever a function key is pressed.
• Test the alphabetical keyboard as follows:
– With a C device (interpretation), press the ECG key and select the Interpretation
icon. Enter the edit screen to test all keys.
– In all other devices, the test can carried out by pressing the
Patient data
key to
enter the patient screen and test all keys.
5.3.6
LCD screen test
• Visually check the screen for spots, or black fields. If many are apparent, the LCD
must be replaced (a few faulty pixels is normal).
• Check that the LCD shade (contrast and brilliance) is even and the same all over.
If not it indicates that the back light may be faulty and the LCD must be replaced.
2
3
1
4
The LED indicators on the unit casing indicate the power operation, and the battery
symbol indicates battery capacity. Both of these are detailed in the operation overview
(see page 18).
