6
D-E340/E341
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:
Procedure:
1. Connect the oscilloscope to the test points TP601(RF) on the
MAIN board.
2. Set a disc. (YEDS-18)
3. Press the
>B
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.
[MAIN BOARD] (SIDE B)
IC601
90
61
91
R404
R609
R608
R613
R618
R636
C609
R611
R635
R633
R301
R610
C605
C606
D101
C421
R484
C500
R614
R606
C611
C612
R615
R607
R429
C614
TP601
(RF)
R613R612
C604
C621
R604
Q405
BCE
Q403
ECB
FB407
R405
R430
FB101
C206
C106
R1
R209
VDR602
TP601(RF)
oscilloscope
(AC range)
RF level
0.45 to 0.65 Vp-p
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500n
s
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