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I have not seen this model Hitachi but I have never seen one with 2 fans for the lamp---in all cases there is usually only one-
Hitachi only offers service manuals online and only to authorized repair shops with a user name and password. If two fans ARE involved it is unlikely both would be bad---flying by the seat of our pants I would suggest if possible to check the voltage at the fans---or even spin them to see if they will suddenly work---dirt can cause a fan to slow or stop and the set would either shut down or issue some kind of "fan failure" or temperature warning.
I am willing to help as much as possible and I understand the desire for a diagram but that is unlikely.
Let me know if I can assist or such in any way---I do this here for free but am here to help people.