Panasonic SA-AKX73P Service Manual page 52

Step 2 Release 2 catches of the Heatsink Clip.
Caution: During releasing of the 2 catches, avoid touching
the Heatsink due to it's high temperature after prolonged
use. Touching it may lead to injuries..
Step 3 Remove the Heatsink Clip.
Step 4 Remove the Audio Digital Amp IC (IC5900).
11.19.2. Assembly of Audio Digital Amp IC
(IC5900)
Step 1 Apply grease to the Heatsink.
Step 2 Fix the Audio Digital Amp IC (IC5900) on D-Amp P.C.B.
Caution: Ensure pins of the Audio Digital Amp IC (IC5900)
are properly inserted into the D-Amp P.C.B..
Step 3 Fix Heatsink Clip to the Heatsink.
Caution: During assembling, ensure that the Heatsink Clip
is catched onto the Heatsink properly.
Step 4 Solder pins of the Audio Digital Amp IC (IC5900) on the
solder side of D-Amp P.C.B..
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