"Where's my tone gone?"

I've often suggested that television is surprisingly free of jargon. This position is somewhat hard to maintain when faced with exchanges thus:
"Where's my tone gone?"
"What do you mean?"
"I'm sending tone to the racks relay, but I can't find it. Where's it gone?"
"What's it routed to?"
"The DS, SP, Digi, DV and SX decks. Everything but the D3."
"Try the other Digi?"
"Nahhhhh Oh! I know! It's that weird 440Hz for the M&Es, not 1K"
"Oh that's what the hum is! Who the hell uses 440?"
"Read the delivery spec sheet."
(does so) "Gaaaaaah!"
Why are Fridays never simple?