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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.
cd
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.
3. RF LEVEL and jitter check
Test mode PLAY status
Connection P oint : CD board (Conductor side)
13
12
15
10
20
24
IC701
25
30
40
35
36
37
TP
(RFO)
B
SECTION 4
TEST MODE
PGM
VOL
–
(TEST-1)
VOL
+
1-675-599-
CD TEST MODE
SHORT : TEST MODE
OPEN : NORMAL MODE
oscilloscope
(AC range)
TP (RFO)
TP (VC)
5
1
TP
(VC)
48
45
Check to see that the jitter is less than 9.0 nsec. and RF level is
between 0.9 –1.3Vp-p.
VOLT/DIV : 200mV (using 10:1 probe)
TIME/DIV : 500ns
4. TRAVERSE SIGNAL check
Connection P oint : CD board (Conductor side)
15
20
24
25
30
35
36
TP
(RFO)
Press the FF or FR from step 3.
Check to see that the traverse signal level is between 300 to
400mVp-p.
0V
5. RELEASE THE TEST MODE
After completed with adjustment, press the POWER button to
release the test mode.
– 12 –
RF level:
0.9 – 1.3 Vp-p
C712
12
13
10
5
1
IC701
48
45
40
37
B
Note:
Extend the sweep time
for easier view.
A
300 – 400mVp-p
0V
B
A = B
oscilloscope
(AC range)
TP (VC)
TP
(VC)
A
B
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