Panasonic SU-HTB550GK Service Manual page 39

Step 2 : Remove 1 screw.
Step 3 : Remove the Switching Regulator IC (IC5701) from the
Heatsink Unit A.
11.4.4.2. Assembly of Switching Regulator
IC (IC5701)
Step 1 : Apply Grease on the Heatsink Unit A.
Step 2 : Fix the Switching Regulator IC (IC5701) to the SMPS
P.C.B..
Caution: Ensure the pins of Switching Regulator IC
(IC5701) seated on the SMPS P.C.B..
Step 3 : Screw the Switching Regulator IC (IC5701) to the
Heatsink Unit A.
Caution: Ensure the Switching Regulator IC (IC5701) is
tightly screwed to the Heatsink Unit A.
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