Electrical Adjustments - Sony D-CJ01 Service Manual

D-CJ01
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.
VOLUME button : Minimum
HOLD switch : OFF
8
SECTION 4

ELECTRICAL ADJUSTMENTS

(J401)
MAIN BOARD (SIDE A)
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
TP614 (RF)
9
TP626
R504
830
TP614
(RF)
R635 TP513
R662
1
C619
R641
C637
R634
TP608
R633
TP609
90 70
91
80
IC601
110
1
10 20
20
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)
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
RF level
0.4 to 0.8 Vp-p
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.
oscilloscope
(AC range)
2K Ω
C60
16
SL409
C501
TP506
C508
D101
TP507
C506
TP613
R503
TP508
TP514
TP509
C309
R505
R506
R630
C657
C618
R629
R618
61
TP616
60
TP617
C610
TP605
51
40
R210 C2
C106
31
AP603
C105
30
C2
AP602
T
S