Panasonic SA-AK270EB Service Manual page 49

Special Note: Ensure pins of the switch regulator IC (IC5701)
are properly seated and soldered on SMPS P.C.B..
9.26. Replacement of Switch
Regulator Diode (D5702)
Follow the (Step 1) - (Step 5) of Item 9.4
Follow the (Step 1) - (Step 7) of Item 9.5
Follow the (Step 1) - (Step 5) of Item 9.19
Follow the (Step 1) - (Step 4) of Item 9.24
Step 1 Desolder pins of the switch regulator diode (D5702) on
the reverse side of SMPS P.C.B..
Step 2 Desolder pins of the heat sink A.
Step 3 Remove 1 screw from the switch regulator IC (IC5701).
Step 4 Remove the heat sink A in the direction of arrows.
Step 5 Remove 1 screw from the switch regulator diode.
(D5702).
Step 6 Remove the switch regulator diode (D5702) from the
heat sink A.
Caution: Handle the heat sink A with caution due to its
high temperature after prolonged use. Touching it may
lead to injuries.
Note : Refer to the diagrams of SMPS P.C.B.. (Item 19.6.) for
location of the part.
9.26.1. Assembly of Switch Regulator
Diode (D5702)
Step 1 Apply grease to the heat sink A.
Step 2 Fix and screw the switch regulator diode (D5702) to the
heat sink A.
Special Note: Ensure the switch regulator diode (D5702) is
tightly screwed to the heat sink A.
Step 3 Fix the heat sink A on SMPS P.C.B. in the direction of
arrows.
Step 4 Fix and screw the switch regulator IC (IC5701) to the
heat sink A.
Special Note: Ensure the heat sink A is properly seated on
SMPS P.C.B..
Step 5 Solder pins of the switch regulator diode (D5702) on the
reverse side of SMPS P.C.B..
Step 6 Solder pins of the heat sink A on the reverse side of
SMPS P.C.B..
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SA-AK270EB / SA-AK270EG