Electrical Adjustment - Sony XM-475GSX Service Manual

Stereo power amplifier

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Operating instructions (2 pages)

Training manual (62 pages)

Product manual (2 pages)

Table Of Contents

Table of Contents

XM-475GSX

Bias Adjustment

Note : The Bias adjustment should be performed only if any of

Q109, Q110, Q209, Q210, Q309, Q310, Q409 and Q410

are replaced.

Setting :

Stabilized

Power supply

B+,REM terminals

GND terminal

Procedure:

1. Rotate the variable resistors RV104, RV204, RV304 and RV404

fully in the clockwise direction to minimize the idling current

of the stabilized power supply.

2. The input signal is to be no signal.

3. Set the power voltage to +14.4 V, and turn the remote mode ON

(Connect between the REM terminal and B+ terminal).

4. Connect on digital voltmeter between each test points.

5. Adjust RV104, RV204, RV304 and RV404 so that the digital

voltmeter reading is 2.5 ± 0.5 mV.

RV Ref. No.

Test points

RV104

TP11 and TP12

RV204

TP21 and TP22

RV304

TP31 and TP32

RV404

TP41 and TP42

6. Check the power supply current is at 1.2 to 1.6 A.

SECTION 3