Adjustment - Pioneer S-FCRW240B-S Service Manual

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6. ADJUSTMENT

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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!
6.1 MEASURING INSTRUMENTS
¶ Provide yourself with the following measuring devices:
(1) Digital voltmeter
(2) Oscilloscope
(3) Attenuator
(4) Low-frequency oscillator
7 7 7 7 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
(4.5Vrms/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
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L 13942296513
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Digital
Voltmeter
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28Ω
3 W
Adjustment VR
VR41
Gain Adj
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AMP ASSY
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