Updating One Recordset Using Another Recordset?

I have two tables that have the exact same fields. In table1 I have records that need to be UPDATED into table2. I tried an Update query and out of 600 records only half of those got updated. In my update query I joined tbl1 and tbl2 by Location (LOC) I checked for Nulls, Blanks, spaces, you name it. I can't figure why they all didn't get updated. I created a SQL query and go the exact same results. Ideally, I would like to create something in VBA to do this. I do not have any forms linked to these tables. In all I have about 600 records and 15 different fields that need to be updated. My example is only for one field.

sql example below. Which is the Access Sql in the Query

sql = "UPDATE tbl2 INNER JOIN tbl1 ON tbl2.LOC = tbl2.LOC" & _
"SET tbl2.Name = tbl1!Name" & _
"WHERE (((tbl2.Name) Is Null));"

Example.

Table1
Field1.Names = John

Table2
Field1.Names = "Need to UPDATE the name 'John' here"

I tried the Recordset .EDIT but I couldn't get it to work using two tables.