HP LaserJet MFP Analog Fax Accessory 300 Guide page 17

The fax card contains parts that are sensitive to electrostatic
discharge (ESD). When removing the fax accessory from its antistatic
pouch and while installing it, use static protection, such as a
grounding wrist strap connected to a grounded metal frame of the
MFP or touch the metal frame of the MFP with your hand while
installing the fax card.
If you are replacing an existing fax card, remove the card that is to be
Note
replaced from the formatter.
While handling the fax card, do not press on the yellow component on
CAUTION
the card because this could damage it and cause a fax malfunction.
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Installing the fax card on the formatter - HP LaserJet 4345mfp
Figure 1-9
ENWW
Remove the fax card from its antistatic pouch.
Insert the fax card connector (1) into the formatter fax connector
(2), see Figure 1-9. The connector (2) on the formatter board is
labeled "FAX ACCESSORY." The ends of the card should slide
into the two guides (3) and the card should "snap" into place
when it is fully seated.
Verify that the accessory is securely seated. The phone
connector (4) on the fax card should be aligned with the opening
(5) in the back of the formatter cage, see Figure 1-9.
Installing the fax accessory 9