Having problems with your Hoover Self-Propelled WindTunnel Bagless Upright VacuumVacuum ?

Vacuum faulty power PCB, Need service manual/schematic

\015 Product: Hoover U8371-900\015\012\015\012Simple problem: Relay to the main vac motor always on\015\012\015\012Long Problem: The relay activates when pluged in before you activate the power button. Visible inspection of the board reveils a burnt transistor and diode Q1 and D3.\015\012\015\012There appears to be a hoover service manual out there somewhere in PDF format. servicetechhelp.com has a copy, for paying members only! \015\012\015\012The FET part number is unreadable thru the scorching, and the diode was virtualy pure carbon residue. Does someone have a copy of this service manual. Or even a vac they could maybe read the part numbers from? I know the relay triggers at 12 volts (presumably DC).\015\012\015\012The PCB also has a debug connection to it's microcontroller, but I am unsure of it's data format and voltage specifications. The microcontroller is a 20pin (maybe) SOIC, with a sticker, labeled ''Murcury ver:1.0.0. I assume it is from STmicro, the bulk of the other chips are various STmicro parts, but I didn't peal the sticker off yet. There is likely an error code waiting to be retrieved that points to the original problem.\015\012\015\012Aside from the relay problem the board appears to function normaly.\015\012\015\012Component suggestions or actual values would be of great help!\015\012\015\012The PCB in qustion is Hoover part number 46851068JI Rev A0, possibly assembled by Cyntec.\015\012\015\012I am not the original owner and it is past it's warranty date. A new PCB would be more than 75USD\015

Answers :

No schematic found. The Q1 transistor is a 2N3904, D3 was replaced with a 1N4000 series.
\015\012Root cause still Unknown, but Q1 is an exact match and D3 is an acceptible replacement.
\015\012Hoovers solution is to replace the whole PCB no matter whats wrong with it, what a waste or good technology!
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