Sony D-E666 - 4 Electrical Adjustments

8
D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK
SECTION 4
ELECTRICAL ADJUSTMENTS
The CD section adjustments are done automatically in this set.
Precautions for Check
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement : DC4.5 V in DC IN jack.
(J401)
VOLUME button : Minimum
AVLS switch : NORM
HOLD switch : OFF
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
RF level
0.4 to 0.65 Vp-p (Except US model
)
0.35 to 0.65 Vp-p (US model)
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
1
5
89
13
16
L
601
R617
C608
C6
3
R412
R500
C609
R606
TP639
C611
C621
L301
R619
C407
R603
C613
R609
Q405
R600
R604
R502
R610
C603
R503
R605
L101
C605
C615
D202
R506
C604
C506
IC601
R622
R2
TP431
GND
C635
C505
C622
C607
R1
R504
C612
R408
R657
TP640
C625
C601
C628
T
P650
5
10
15
20
35
31
30
35
40
45
50
55
61
65
70
75
80
85
90
91
100
95
110
115
120
105
60
TP818
TP638
TP201
TP416
R608
D302
L6
0
C610
C606
TP426
R615
R612
8
D203
0
2
C602
C626
C623
C503
3
4
L201
D102
R613
R616
R614
R632
C614
C616
TP410
R607
C504
C627
R601
TP441
TP301
C632
R602
R650
C629
IC500
R611
1
US MODEL
EXCEPT
US MODEL
E
XCEPT
U
S MODEL
TP629 (RF)
TP431 (GND)
2 K
Ω
oscilloscope
(AC range)
[ MAIN BOARD] (Side B)
Procedure:
1. Connect the oscilloscope to the test points TP629 (RF) and TP431
(GND) on the MAIN board.
2. Set a disc. (YEDS-18)
3. Press the u button.
4. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the cen-
ter of the waveform can be clearly distinguished.
RF Signal reference Waveform (Eye Pattern)
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy
watching.
5. Stop revolving of the disc motor by pressing the x button.