Page 162 (Model J)
19. Trouble Shooting Chart
1. Symptom: Mains present LED is OFF but ventilator is connected to
mains power supply.
Possible Cause
Mains power supply turned off.
Blown main fuse.
Power supply has developed a fault.
Remedy
Turn on mains supply.
Replace main fuse.
Replace power supply (See “M0910 Power Supply Unit” on page 39).
2. Symptom: Ventilator screen remains blank on power up. Power LED
is On.
or
Ventilator screen blank with alarm tone being generated. Ventilator
continuing to ventilate.
Possible Cause
LCD cable disconnected.
Back light power cable disconnected.
Back light PCB failed.
Defective PC Board (Contains video driver).
Remedy
Check LCD cable connected. (See “N6631/02 LCD & N6631/05 Touch Screen” on page
43).
Check backlight power connector.
Check backlight PCB. (See “N6631/03 Inverter PCB” on page 42).
Replace PC board (See “N6631/21 PC Board” on page 35).
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