Test Mode; Electrical Adjustment - Sony D-NE004 Service Manual

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3 7 63 1515 0
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.
MAIN BOARD (SIDE B)
CB414
20 1
IC401
C420
21
40
C410
406
C412
C411
L401
C403
C404
C408
TE
L 13942296513
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SECTION 4

TEST MODE

SL803
(TEST)
C632
R802
R811
C811
R829
FB801
R409
SL803
R820 R823
(TEST) R835
60
41
61
IC801
C409
80
1 20
TP841
TP842
(CDM4)
x ao
y
i
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ELECTRICAL ADJUSTMENTS
8
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.
VOLUME button : Minimum
HOLD switch :OFF
Focus Bias Check
Condition:
• Hold the set in horizontal state.
Connection:
MAIN BOARD
R824
C623
40
X601
FB605
FB401
Q Q
21
3 6 7 1 3
R417
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)
VOLT/DIV : 500 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.
6. Stop revolving of the disc motor by pressing the x button.
u163
7. SL801 is opened by taking the solder bridge.
.
D-NE004/NE005/NE0050/NE006
SECTION 5
2 9 9 4 2 8
(J401)
TP604
(SIDE B)
C627
BLU
25 1
R629
IC602
BLU
26 50
BLU
R632
R619
C612
R617
1 5 0 5 8 2 9 9 4
R621
TP604
(RF)
RF level
1.3 ± 0.2 Vp-p
m
co
9 9
oscilloscope
(AC range)
(RF)
+
–
SL801
(OPEN)
C110
SL801
(OPEN)
L101
S811
C106
(OPEN)
R102
VDR101
VDR201
2 8 9 9
S808
R211
7