KROHNE OPTISONIC 3400 Ex EN - Manual (Page 30)

5
MAINTENANCE AND SERVICE
30
OPTISONIC 3400
www.krohne.com 10/2013 - 7312472200 - AD EX OPTISONIC 3400 -en- R02
• Remove the printed circuit board 6 from the electronics unit 4.
• Check compatibility between the removed and new electronics unit 4, by checking the power
voltage.
• Slide the new electronics unit 4 partially back into the housing.
• Mount the small printed circuit board back onto the electronics unit 4.
• Push the metal pullers 5 back to their original position.
Don't use excessive force, otherwise the connector at the backside can be damaged!
• Screw the electronics unit back to the housing.
• Re-install the display and make sure not to kink the display's flat ribbon cable.
• Replace cover and tighten by hand.
• Connect power.
Figure 5-3: Small printed circuit board and electronics unit
DANGER!
Electrostatic discharge (ESD) can damage electronic parts. Make sure to discharge yourself by
wearing a wrist strap. If no wrist strap is available, ground yourself by touching a metal surface
that is grounded.