Hi Dmitry
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Whilst I share your concerns may I say that the HP fault finding guidance is based around having a set of their 8622A or 8623A PCB card extenders available.? Under most circumstances using the card extenders will leave the power supply loads in place and limit the extent to which the voltages can rise.
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The biggest problem that I see with most SMPSU repairs is a lack of understanding as to how they work and the limitations placed on their control circuitry.? I would suggest reading the excellent posting by Dave G8KBV in the previous 8622A repair thread, the key point is only one voltage control loop.
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G Edmonds.
