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Page 1

STEREO POWER AMPLIFIER

S7.

SERVICE MANUAL

.FRONT PANEL

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0 POWER SWITCH 0 RANGE INDICATOR
9 PROTECTION INDICATOR 0 PEAK POWER INDICATORS
9 PEAK HOLD SWITCH 0 SPEAKER SELECTION SWITCHES
0 RANGE SELECTION SWITCH 9 SPEAKER LEVEL CONTROL
0 METER OFF SWITCH
.CON'I'EN'I'S
REAR PANELS ................................................................... 1
SPECIFICATIONS ................................................................. 2
INTERNAL VIEW ................................................................. 3
DISASSEMBLY PROCEDURES ........................................................ 3
ADJUSTMENT ................................................................... 6
CONTROL C. BOARD/SCHEMATIC DIAGRAM (General model) ................................. 9
CONTROL C. BOARD/SCHEMATIC DIAGRAM (British, Australian and European modem ................ 10
BLOCK DIAGRAM ................................................................ 11
PRINTED CIRCUIT BOARD .......................................................... 12
WIRING DIAGRAM ................................................................ 13
SCHEMATIC DIAGRAM ............................................................. 14

O YAMAHA

004452 NIPPON GAKKI CO. LTD. HAMAMATSU JAPAN

aned "1 Japan 2.8? I: Q 2.65K

Page 2

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GINPUT TERMINAL
@GND TERMINAL
ESPEAKER TERMINAL A
OSPEAKER TERMINAL 8

9 AC OUTLET
0 VOLTAGE SELECTOR