The common faults and solutions to the power supplies on ALL the 22xx scopes are in the archives of this group. seriously this group goes over the same stuff repetitively :)
The 2246 (applies to the 2247) power supply can be removed from the scope and using the fan as a load can be tested as a unit.(With care! this is a mains potential switching supply).
Common failure on these is C2210 4.7uF and in many cases that's all, but if you are unlucky then Q2209/10 which if I remember correctly are TIP32C, following on in the unlucky stakes the mosfet Q2214.
The secondary diodes are rarely at fault, mostly schottky so reading low on diode ranges. and in my opinion the secondary 3 leg caps are reliable.
If testing the board watch out for a bite from J2208 long after you power off! (Near the multiplier, drain it with a 100k resistor). Rarely T2204 fails, also I've had the multiplier fail, (Disconnect its input to confirm).
