CFD-G70L - Sony Audio Service Manual (repair manual). Page 15

15

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) (CD)
3. Press the u 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 cen-

ter of the waveform can be clearly distinguished.

5. Press the u button.(LPC OFF)
6. Perform confirmation in step 4 again.

•

RF Signal Reference Waveform (eye pattern)

Perform all CD section check and all adjustments in the test mode.
How to put the set into CD test mode
1. Press the POWER button turn the set ON.
2. Press the FUNCTION button to select CD.
3. Set Tset mode by momentarlly shorting both side of TEST A.
4. Press the x button two times. The set is into CD test mode.

(

88 is displayed)

5. Turn the power off to release test mode.

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

CONTROL-1 BOARD

S404

S402

S403

S401

KH402

D401

R401

R402

R403
R404

R407

 

 

 

SOUND

(TEST A)

MODE

GAME/LINE

GAME Xpand

GAME Xpand

TEST mode : momentarily short

(Conductor side)

1-68

Q701

C729

C730

R730

R728

R729

C704

R708

C72

8

R726

R707

C70

FB70

C736

C734

IC701

R709

C705

R704

R702

R711

R710

R703
R705
R701

C703

C731

R706

R727

R712

R7

C708

C751

JC703

C743

C744

C74

C742

JW707

C707

C717

C732

C702

C701

JW708

JW709

JW713

JW714

JW723

JW

JW725

JW726

C750

C

7

C747

JW711

C733

C706

JW712

JW710

oscilloscope

(AC range)

TP (RF)

(GND)

CD BOARD   (Conductor side)

TP (RF)