Yamaha R S300, Service Manual, Page: 10 / 76

10
R-S300
R-S30
0
OPERATION (12) P.C.B.
OPERATION (13) P.C.B.
OPERATION (14) P.C.B. (R model)
MAIN (3) P.C.B.
AM/FM TUNER
DOCK P.C.B.
FUNCTION (2) P.C.B.
FUNCTION (3) P.C.B.
FUNCTION (1) P.C.B.
MAIN (2) P.C.B.
MAIN (1) P.C.B.
POWER TRANSFORMER
OPERATION (11) P.C.B.
OPERATION (6) P.C.B.
OPERATION (1) P.C.B.
OPERATION (10) P.C.B.
OPERATION (2) P.C.B.
OPERATION (7) P.C.B.
OPERATION (5) P.C.B.
OPERATION (4) P.C.B.
OPERATION (3) P.C.B.
OPERATION (8) P.C.B.
Top view
Front view
9 11
20 21 19 18 22
12 10
1 2
13 15 16 17 14
5 3 4 8 7 6 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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INTERNAL VIEW
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SERVICE PRECAUTIONS
Safety measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during
servicing, such as wearing insulating gloves.
• Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge
remains and a high voltage continues to exist there.
Before starting any repair work, connect a discharging resistor (5 k-ohms/10 W) to the terminals of each capacitor
indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C135, C136 on MAIN (1) P.C.B.
For details, refer to “PRINTED CIRCUIT BOARDS: MAIN (1) P.C.B.”.