Weinmann BiLevel-ST VENTImotion WM 24800, Инструкции по обслуживанию и ремонту

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20 Test the device
4.16 Test display incl. backlighting and contrast, the LEDs and the
alarm
Note
Before this test is carried out, the VENTI motion must
have been connected to the mains power supply
for at least 5 minutes.
1. Switch on the device.
A beep sounds. Both LEDs come on briefly.
2. Check whether the display is easy to read with
backlighting and that contrast is adequate.
Set contrast
1. Disconnect the power supply plug.
2. Press the humidifier key and the Softstart
key simultaneously.
3. Connect the power supply plug and the socket
again.
4. Turn the rotary knob to select contrast. Activate
contrast by pressing the rotary knob.
Note
If no beep is heard when you switch on, perform
the following measures in sequence and test again
in each case.
• Test the buzzer and replace if necessary (see
"7.13 Replace bottom part of housing" on
page 46).
• Replace the control board (see "7.8 Replace
control board/display" on page 39).
Note
If the contrast cannot be set, perform the following
measures in sequence and test again in each
case.
• Check the display cable.
• Replace the display (see "7.8 Replace control
board/display" on page 39).
• Replace the control board (see "7.8 Replace
control board/display" on page 39).