Electrical Adjustments - Sony D-EJ360 Service Manual

D-EJ360/EJ368CK
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
6
SECTION 4

ELECTRICAL ADJUSTMENTS

(J401)
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
oscilloscope
(AC range)
TJ601(RF)
[MAIN BOARD] (SIDE B)
Q601
C610
L601
R610
R601
14
IC603
Procedure:
1. Connect the oscilloscope to the test point TJ601(RF) 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
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.
R603
R602
C412
TJ601(RF)
C60
R611
R409
13
RF level
0.4 to 0.8 Vp-p
C