Panasonic SA-PT875GA, Service Manual

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Step 9 Flip and position SMPS P.C.B. according to the diagram
shown.
Step 10 Desolder Black wire (TL2) and Red wire (TL1) on sol-
der side of SMPS P.C.B.
Step 11 Remove SMPS P.C.B.
Step 12 Remove Voltage Selector P.C.B.
Special Note: During assembling procedures, ensure the
P.C.B. is seated properly at the locators.
9.21. Replacement of Switching Reg-
ulator IC (IC2903)
9.21.1. Disassembly of Switching Regula-
tor IC (IC2903)
• Follow (Step 1) to (Step 3) of Item 9.3.
• Follow (Step 1) to (Step 11) of Item 9.6.
• Follow (Step 11) to (Step12) of Item 9.13.
• Follow (Step 1) to (Step 9) of Item 9.20.
Step 1 Desolder pins of the switching regulator IC (IC2903) on
the solder side of SMPS P.C.B.
Step 2 Desolder pins of the heatsink extrusion.
Step 3 Remove the heatsink extrusion with the IC in the direc-
tion of arrow.
Step 4 Remove 1 screw from the switching regulator IC
(IC2903).
Step 5 Remove the switching regulator IC (IC2903) from the
heatsink extrusion.
Caution: Handle the heatsink extrusion 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 18.5.) for
location of the electrical components.
9.21.2. Assembly of Switching Regulator
IC (IC2903)
Step 1 Apply grease to the heatsink extrusion.
Step 2 Fix and screw the switching regulator IC (IC2903) to the
heatsink extrusion.
Step 3 Mount the heatsink extrusion with IC2903 on the SMPS
P.C.B.
Special Note: Ensure the switching regulator IC (IC2903) is
tightly screwed to the heatsink extrusion.