Honeywell X Series Installation Instruction Sheet page 10

There are 2 backlights on the QX recorder display. These should be changed as a pair. To get the backlights out use a
small screwdriver to push back the clip as shown in Fig 16 and gently pull on the leads to withdraw the backlight from
the display. Remove both tubes, noting their orientation. Fig 17.
Insert the new backlights and push into the display until the clips latch them in.
43-TV-33-76 iss.2 GLO Jan 21 UK
Fig 16
Push clip up and
pull on cables
Fig 17
Withdraw
backlight tube
10