Panasonic SA-AKX74PH Service Manual page 61

Step 3 Remove 3 screws.
Step 4 Detach the Voltage Selector P.C.B. from Rear Panel as
arrow shown.
Step 5 Lift up and remove the SMPS Inner Chassis Unit.
Caution: During assembling, ensure that the SMPS Inner
Chassis is catched onto the Rear Panel properly.
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