Download Print this page

Adjustment - Sharp SM-SX1 Service Manual

1-bit amplifier

SM-SX1/SX1W

Measure the noise distribution between the set output terminals (Lch+, Lch- and Rch+, Rch-), and adjust VRA1 to VRA4. The VRA

adjustment sequence is the same as that of the offset voltage adjustment.

Measuring instrument: Yokokawa Electric brand SA2400

Measurement range : Refer to Fig. 8-2.

250Hz to 100kHz within ±3dB from the standard noise curve

Adjustable range:

(Noise strength of 125Hz) — (Noise strength of 250Hz)

AC POWER

SUPPLY

UNIT

Speaker terminal

Apply the analyzer between Lch+ and Lch-,

and between Rch+ and Rch-.

Figure 8-1

Standard noise floor curve

(Frequency range 1)

20dBV

Following

ADJUSTMENT

Specterum

Analyzer

20dB

Figure 8-2

– 8 –

Table of Contents

Sm-sx1w