Electrical Adjustments; Tuner Section - Sony CDX-C5750 Service Manual

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Operating instructions manual (28 pages)

Installation/connections (4 pages)

Installation/connections (5 pages)

Table Of Contents

Table of Contents

0 dB = 1 µV

TUNER SECTION

Cautions during repair

When the tuner unit is defective, replace it by a new one because

its internal block is difficult to repair.

FM Center Adjustment

Setting:

SOURCE button

: FMI

D-BASS switch (C5750) : OFF

FM RF signal

generator

Carrier frequency: 97.9 MHz

Output lever

: 60 dB (1 mV)

Mode

: mono

Modulation

: 1 kHz, 75 kHz deviation (100%)

FM CENTER

OUT

IC1 pin #¶

(Both side

IC1 pin #¢

of R24.)

Procedure:

1. Adjust IFT4 on TU601 so that the reading on the digital

voltmeter becomes in 0 ± 30 mV.

2. Output an Fcenter 10 dB signal output from FM RF signal

generator so that the speaker out is –20 dBs.

3. Change the FM RF signal generator frequency and check the

deviation of the frequency on + side and – side when the speaker

out drops 3 dB. (Both + side and – side is approx. 50 kHz.)

4. Re-adjust IFT4 on TU601 when the difference deviation of the

frequency does more than 10 kHz.

0 dBs

–3 dBs

(fc–10)

Adjustment Location: See page 17.

SECTION 3