Sanyo DCA 611 Service Manual

Page 2

FUNCTIONAL BLOCK DIAGRAM

JACK
W RECOUT
1 c NJM4558
I
FUNngN FUNCTION TAPE
PHONO . sw. SW. TONE
2 EO AMP. AMP- V
MONO MIDDLE
MODE
sw. ®
HIGH Low
FILTER Flt-TER
fl
BAss TREBLE
POWER
LEVEL
we
BALANCE VOLUME 1c STK-oo59
. n
N RELAY
_ POWE 0/0 :a SPEAKERS
AMP
I!
PROTECTOR
DC Protect

Thermal Protect
Power Supply Muting

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EXPLANATION OF PROTECTIVE CIRCUITS

*For about two seconds after the power switch is turned on,
the speakers remain silent because the power muting circuit
operates during this time.

* it this unit is operated with speakers of 4 ohm or less, or by
being operated to drive two pairs of speakers of 8 ohm or less
simultaneously, its power limitter will start to operate.

If under these conditions the volume is raised to a high
ievei the sound from the speakers may be distorted

DCA 611

*lt the speaker terminals are shortttircuited or the ventilation
holes at the cabinet top are blocked during long periods of
Operation, the internal temperature may rise abnormally.
At about 90° C, the thermal sensor (temperature detection)
circuit becomes activated and will lnterrupt the signal. It the
cause is removed and the internal temperature is back to
normal, the unit automatically resets itself to restore normal
operation.