Le hace falta darle servicio a esta impresora.
(This printer needs to be serviced.)

its a dogs dinner isnt it.  :-)

why not esta impresora se necesita un servicio

im guessing they are  reflexive hacerse y darse

you become a failure. give yourself a service this printer

sounds positively japanese :-)

but surely there is some sexual ambiguity here. its la impresora so why all the le? why not la or se?

ha ha ha ha ha!

La impresora is "le" because it is the indirect object of the verb dar. 

Dar is a dative verb (n.b. Latin root), and dative verbs require both direct objects and indirect objects.  Here, the direct object is "servicio." 

So a grammatical gloss of that sentence could be something like "it is necessary to give service to the printer." 

So "a la impresora" is the indirect object (beneficiary) of the action "dar."

Indirect objects are always pronominalized as "le" (or plural "les") regardless of gender in Standard Spanish.  

"la" would be a direct object

"se" would be a reflexive (direct or indirect).  

That's my answer for the "le" in "darle."

As for the "le" at the beginning of the sentence, it belongs to "hacer falta."  The thing is that certain verbs demand to have indirect objects, it doesn't matter whether it is redundant, or if it doesn't really stand for anything.  "Hacerle falta" is one of those verbs (so is gustar, encantar, dar...).  They sound awful without an indirect object pronoun.  

So what does the "le" stand for in the beginning?  Not sure.  I assumed it was 'usted,' (i.e., it's necessary for you to give service to that printer) but now that I think about it, it could be any third person singular antecedant, abstract or real.  

In any case, "la" or "se" couldn't stand in for either of the "le"s that you see.

Here's the rule:  If the subject of the main clause is the same as the subject of the dependent clause, you use an infinitive:

Example:  Salgo contigo después de tomar una taza de café. I'll go out with you after I have a cup of coffee.

If the subject of the main clause differs from the subject of the dependent clause, you use a conjugated form of the verb after después de+que:

Example:  Salgo contigo después de que tomes una taza de café. I'll go out with you after you have a cup of coffee.

There is usually a "que" that introduces a clause with a subjunctive in it, but if there's a "de" it's because the "de" belongs to something previous.

For example, in "después de que tome," that "de" belongs to "después de."

Te queda en camino?  Is it on your way?

http://myspanishnotes.blogspot.com/2009/07/te-queda-en-camino.html

caigo is caer conjugated in the first person

to her (le) i dont fall (no caigo) muy bien (very well)