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SECTION 4
TEST MODE
3. RF LEVEL and jitter check
Test mode PLAY status
Connection P oint : CD board (Conductor side)
CD SECTION
1. Entering CD test mode
With the POWER button ON, short JW880 and JW881 on the
SW (1) board. (You need a moment for the short.)
The LCD display changes as in the diagram and the unit goes
into test mode.
When you press the
u
key, the CD rotates and when you press
the
u
key again, the CD plays (the track servo comes on)(but
no sound is issued).
Pressing the
u
key starts automatic adjustment and the value
changes, but this value is not a problem.
[SW (1) BOARD] (Conductor side)
2. Exiting test mode
With the unit in test mode, when you press the POWER button
to OFF, test mode ends.
PGM
cd
RF level:
0.9 – 1.3 Vp-p
VOLT/DIV : 200mV (using 10:1 probe)
TIME/DIV : 500ns
R720
R719
R790
C737
C739
52
R753
C740
R718
93
C736
R732
R731
C729
R735
3
4
3
794
C727
C723
C725
C713
R799
C721
JW739
R717
C718
C7
5
R727
R722
C704
0
6
C722
C744
R706
4
2
2
5
R700
R745
C701
C714
C710
R723
R743
C712
R73
0
R728
C702
R703
C715
C709
R701
C711
JW705
4
1
C717
4
3
C7
2
R733
R71
1
C716
R7
R721
1
36
25
24
13
15
20
37
48
45
40
30
35
5
10
12
IC701
B
TP
(RFO)
TP
(VC)
oscilloscope
(AC range)
TP (VC)
TP (RFO)
1-675-599-
R848
R849
R850
R851
R859
JW880
JW881
S811
S812
S813
VOL
–
VOL
+
(TEST-1)
>
+
CD TEST MODE
SHORT : TEST MODE
OPEN : NORMAL MODE
Check to see that the jitter is less than 9.0 nsec. and RF level is
between 0.9 –1.3Vp-p.
4. TRAVERSE SIGNAL check
Connection P oint : CD board (Conductor side)
Press the FF or FR from step 3.
Check to see that the traverse signal level is between 300 to
400mVp-p.
5. RELEASE THE TEST MODE
After completed with adjustment, press the POWER button to
release the test mode.
Note:
Extend the sweep time
for easier view.
300 – 400mVp-p
A
A
B
B
A = B
0V
0V
R720
R719
R790
C737
C739
52
R753
C740
R718
93
C736
R732
R731
C729
R735
3
4
3
794
C727
C723
C725
C713
R799
C721
JW739
R717
C718
C7
5
R727
R722
C704
0
6
C722
C744
R706
4
2
2
5
R700
R745
C701
C714
C710
R723
R743
C712
R73
0
R728
C702
R703
C715
C709
R701
C711
JW705
4
1
C717
4
3
C7
2
R733
R71
1
C716
R7
R721
1
36
25
24
13
15
20
37
48
45
40
30
35
5
10
12
IC701
B
TP
(RFO)
TP
(VC)
oscilloscope
(AC range)
TP (VC)
C712