– 8 –
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:
Procedure:
1. Connect the oscilloscope to the test points TP629 (RF) and TP635
(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
watch-ing.
5. Stop revolving of the disc motor by pressing the
x
button.
RF level
0.4 to 0.5 Vp-p
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500n
s
D
S
TP608
C611
R604
C628
TP637
R633
TP639
R602
C618
21
TP619
C626
TP617
TP618
R606
R603
R608
C603
R611
R610 R609
TP635
(GND)
R605
C620
C607
C615
R
R
C609
C604
TP630
IC601
R613
C625
C623
C605
R615
R1
TP629
(RF)
C602
C613
R612
R639
FB602
FB101
C632
TP101
R643
US MODEL
FB301
L601
C638
R617
TP634
R614
TP631
C614
C622
R638
R630
04
C627
A
P601
R616
R619
R408
C612
TAP602
TP632 TP633
R607
R641
C606
R632
TP301
TP305
D302
P616
TP426
C631
TP413
47
48
49
VDR102
Q405
C635
VDR202
1
5
10
15
20
25
30
31 35
40 45
50
55
60
61
65
70
75
80
85
90
95
100
105
110
115
120
91
EXCEPT
US MODEL
XCEPT
S MODEL
EXCEPT
US MODEL
TP629 (RF)
TP635 (GND)
2 K
Ω
oscilloscope
(AC range)
[ MAIN BOARD] (Side B)
Содержание CD Walkman D-E660
Страница 4: ... 4 SECTION 2 GENERAL LOCATING THE CONTROLS This section is extracted from instruction manual ...
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Страница 11: ... 11 13 12 5 2 BLOCK DIAGRAM Signal path J CD D E660 EJ610 EJ611 EJ613 EJ615 EJ616CK ...
Страница 22: ... 32 D E660 EJ610 EJ611 EJ613 EJ615 EJ616CK ...
Страница 30: ...D E660 EJ610 EJ611 EJ613 EJ615 EJ616CK 2 ...