Yamaha YST-SW315 _ Sub-Woofer _ Circuit Diagram & Adjustments [A1145_C2705]
Idling Adjustment
* To stabilize operation of the
amplifier, turn ON the power with no input signal and wait for 2 to 3 minutes
in non loaded condition before the adjustment.
* Confirm that the voltage across
the terminals TP11 and TP12 is 10 mV to 200 mV.
If it exceeds 200 mV, open (cut off) R172.
Confirmation of AUTO STANDBY
operation.
Setting
# Turn off the power switch located
on the rear panel.
# In order to shorten the time required for
operation check; connect a 10kΩresistor at both ends of R252 on the MAIN P.C.B.
# Connect the output signal from
the signal generator to the INPUT 2 / L/MONO terminal of the unit.
# Set the signal generator for the
sine wave of 100Hz, 8mV.
# Turn on the power switch located
on the rear panel.
Confirmation
* Set the AUTO STANDBY switch to
the LOW position.
* Turn on the STANDBY/ON switch.
* The display LED lights up (green)
and its colour changes
* To red after 5 to 10 seconds.
* Turn off the STANDBY/ON switch.
* The display LED goes off.
* Set the AUTO STANDBY switch to
the HIGH position.
* Turn on the STANDBY/ON switch.
* The display LED lights up (green)
and its colour remains Unchanged even after time has
elapsed.
* Turn off the STANDBY/ON switch.
* The display LED goes off.
After confirmation
* Turn off the power switch.
** Disconnect the 10k Ωresistor connected to both
ends of R252.
SCHEMATIC [Circuit Diagram] & PWB
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