8
D-CJ01
Procedure:
1. Connect the oscilloscope to the test points TP614 (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
watching.
5. Stop revolving of the disc motor by pressing the
x
button.
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
HOLD switch : OFF
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
RF level
0.4 to 0.8 Vp-p
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500n
s
110
90
TP608
TP609
AP605
C637
C636
C627
1
L602
91
TP626
830
R811
R810
R643
TP614
(RF)
TP506
TP507
SL409
C508
TP514
TP508
R503
C510
C507
TP613
C60
T
R505
R506
C309
C657
D101
C619
R634
R633
C618
R635
C625
C622
TP513
R504
C506
TP617
TP605
S
TP509
TP616
C610
R618
R629
R613
R614
61
60
70
R210 C2
C106
R110
R109
R209
31
40
51
20
IC601
AP603
AP602
6
52
30
TP611
R662
R641
R630
C105
C2
R609
R608
1
80
20
10
C501
9
16
MAIN BOARD (SIDE A)
TP614 (RF)
2K
Ω
oscilloscope
(AC range)
Summary of Contents for WALKMAN D-CJ01
Page 31: ...31 D CJ01 ...