Agilent Technologies TwisTorr 74 FS PCB 24 Mode D'emploi page 170

16 Instructions for Use
Maintenance
Maintenance
The TwisTorr 74 FS series controllers do not require any form of
maintenance. Any intervention must be performed by authorized
personnel.
In case of failure you can use the Agilent customer support service or
the "Agilent advance exchange service", the latter consisting of
replacing a faulty controller with a refurbished one.
WARNING! Unplug the power cord from the electrical socket before performing any type
of intervention on the controller.
If a controller needs to be scraped, proceed to do so in compliance
with the specific national laws.
170/209 TwisTorr 74 FS PCB 24 Vdc Controller User Manual / 87-901-056-01