PIONEER S-FCRW230-S/KUXC
Manual de Servicio

S-FCRW230

7. ADJUSTMENT
ATTENTION
¶ Don� t make speaker terminal short circuit during the power supply injection. ¶ Since the PRIMARY part of the AMP ASSY is not insulated, be careful of electric shock. ¶ Be sure to disconnect the power supply cord before touching the AMP ASSY board. ¶ Discharge the C13, C14 capacitors!

7.1 MEASURING INSTRUMENTS
¶ Provide yourself with the following measuring devices: (1) Digital voltmeter (2) Oscilloscope (3) Attenuator (4) Low-frequency oscillator

7 GAIN Adjustment
(1) Decrease the level of the Adjustment Variable resistors (VR) for the channel to adjusted. (2) Increase LEVEL VOLUME maximum. (3) Adjust GAIN (VR41) volume. ¶ Apply the signal to the Line IN of JA201. ¶ As the gain from IN to SPEAKER OUT 53dB(freq. = 50 Hz), input of 10mVrms to Input results in output of 0.72 W (4.5 Vrms/28 W) at SPEAKER OUT. ¶ After power-supply ON, after waiting abut 10 seconds, it adjustment because, wave form rises behind time for slow start operation.

Test Point

A
Digital Voltmeter +
28� 3W

AMP ASSY

SIDE A

Adjustment VR VR41 Gain Adj

15