Donald,

I assume that Technician is the name of the combobox, and not tech name
as you started off with?  The only thought I have on the specific
question is that perhaps [TECHNICIAN_PHONE] is not the correct name for
the control on your form.

However, a couple of comments not directly on your question...  What you
are doing here would generally be regarded as an invalid process.  A
database is supposed to be used relationally, part of which means that
data should not be replicated from one part of the database to another.
 Whatever the record source of your form, it should only have one field
referring to the technician, corresponding to the unique identifier for
the technician.  There are various approaches to getting the Phone and
Email showing up on the form, but they do *not* include writing the data
into the fields.  By the way, it looks like the unique identifier
(primary key?) for the tech in the Tech table is Tech_name, am I right?
 If so, you have to consider whether it will ever be possible to have
two Techs with the same name.