CFD-V3, CFD-V7, CFD-V7L - Sony Audio Service Manual (repair manual). Page 11

11

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

 (       ) : V3/V7: AEP, UK, CET, SP,KR
 <     > : V7:Italian
 [       ] : V7L

AM/LW IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T2

455kHz

EXCEPT V7L

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L4

520kHz  (   520kHz)  <   516kHz>

CT4

1,780kHz  (1,680kHz)  <1,630kHz>

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3

620kHz

CT3

1,400kHz

V7L

LW FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L4

145kHz

CT4, CV2

300kHz

LW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3

160kHz

CT3, CV3

260kHz

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

10.7MHz

FM FREQUENCY COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter.

L2

86.5MHz (  87.0MHz) <  87.35MHz> [  87.0MHz]

CT2

109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1

86.5MHz (  87.0MHz) <  87.35MHz> [  87.0MHz]

CT1

109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]

Adjustment Location : Main board (See page 12)

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

Focus Bias Check
1. Connect the oscilloscope between TP (RF) and GND on CD

board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the 7 button two times (LPC ON).
4. Confirm that the oscilloscope waveform is as shown in the fig-

ure below. (eye pattern)
A good eye pattern means that the diamond shape (

◊) in the

center of the waveform can be clearly distinguished.

•

RF Signal Reference Waveform (eye pattern)

When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity

How to put the set into CD Test Mode
1. Set the function switch to power off.
2. Set the function switch to CD.
3. Set Test mode by momentarily shorting both of the IC801 51pin

to GND. (Shorting the terminals momentarily is sufficient).
The set is into CD test mode (

88 is displayed).

4. Turn the power off to release test mode.

S351

R812
R811

R809

R810

-1   -2

R851

C844

C

8

C8

R815
R814
R813

 

C801

R816

R

JC310

C810

JW316

JW317

JW318

320

21

IC801

GND

51pin

TEST mode : momentarily short

[MAIN BOARD] (Conductor side)

C730

R730

R729

C704

C736

C734

R704

R702

R703

R705

R701

C703

IC701

C731

R706

C

703

C743

C744

C

4

2

R709

R710

R708

C705

R711

TP

(RF)

J

JW

JW726

C

C747

JW710

9

oscilloscope

(AC range)

[CD BOARD] (Conductor side)

(GND)

TP (RF)

• Abbreviation
   CET  : East European & Russian
   SP     : Singapore