I tried to repair the Disklavier power unit during the summer vacation.
Two of these three were completely recovered.
One of them is unknown reason but the voltage came back normal.
The condition of the failure is not powered on.
Or it turns off in a while.
I replaced the following parts.
Case1: Replacement of these parts capacitor C15/C12(100μ6.3V) C22（22μ16V) .
Case2： Also replacement of above parts and transistor Q4(2SC3263).
Case3: Capacitor C15/C12(100μ6.3V) C22（22μ16V) and removed R3(100k)??? Q1/2/3 and D1 are normal.
I need a more detailed survey.
