7
D-NE004/NE005/NE0050/NE006
SECTION 4
TEST MODE
The CD section adjustments are done automatically in this set.
Adjusting Procedure:
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. Make a solder bridge to short SL801 (OPEN) on the MAIN
board side B.
2. Connect the oscilloscope to the test point TP604 (RF) on the
MAIN board side B.
3. Set a disc. (YEDS-18)
4. Press the
u
button.
5. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape ( ) in the
center 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.
6. Stop revolving of the disc motor by pressing the
x
button.
7. SL801 is opened by taking the solder bridge.
S811
(OPEN)
(SIDE B)
MAIN BOARD
TP604
(RF)
1
26
25
50
SL801
(OPEN)
BLU
FB605
FB401
R629
C206
R202
R626
R623
FB601
RB301
FB302
R111
R101
D303
C308
C310
C640
R618
R622
C633
S808
C106
C627
C110
R102
R632
C612
R619
R621
R211
L101
VDR101
VDR201
FB301
R617
2
IC602
R416
R417
R418
ORG
RED
GRY
BLK
X601
BLU
BLU
SL801
(OPEN)
oscilloscope
(AC range)
+
–
TP604
(RF)
RF level
1.3
±
0.2 Vp-p
VOLT/DIV : 500 mV (With the 10 : 1 probe in use)
TIME/DIV : 500n
s
SECTION 5
ELECTRICAL ADJUSTMENTS
Procedure:
1. Make a solder bridge to short SL803 (TEST) on the MAIN
board side B.
2. Press the
u
button.
3. Confirm LCD displays all lights.
4. Confirm the version of the microcomputer will be displayed
in 2 or 3 seconds.
5. To exit this mode, stop supplying power.
6. SL803 is opened by taking the solder bridge.
21
40
40
20
21
60
80
61
41
20
1
1
BATT+
(SIDE B)
MAIN BOARD
SL803
(TEST)
406
8
21
C632
C811
C410
C412
C403
C411
C404
C408
C409
CB414
R823
R820
R802
R409
FB801
C420
L401
IC401
R812
R826
C623
R829
R835
R811
R824
IC801
VDR801
TP841
(CDM4)
TP842
SL803
(TEST)
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