14
ZS-YN7
CD SECTION
Perform all CD section check in the test mode.
HOW TO THE SET INTO CD TEST MODE
1. Press the [POWER] button to turn the power on.
2. Select CD function.
3. Press the x button.
4. Set test mode by momentarily shorting both of TAP (TEST A)
on the MAIN board to enter the CD test mode.
5. Press the u button, and press the x button to enter the
STOP2 mode.
Note: When the following figure is displayed accidentally, release from
the CD test mode and redo operation.
6. To release the CD test mode, press the x button, and turn the
power off.
Checking Location:
TRAVERSE CHECK
1. Connect an oscilloscope to TP (TE) and TP (VC) on the CD
board.
2. Insert the disc (PATD-012). (Part No.: 4-225-203-01)
3. In the STOP2 mode, press the u button to enter the FOCUS1
mode.
4. Confirm that the center of the oscilloscope waveform is at 0 V.
5. Confirm that the oscilloscope waveform Vp-p value is at 0.35
to 1.1 V.
FOCUS BIAS CHECK
1. Connect the oscilloscope to TP (RF) and TP (VC) on the CD
board.
2. Insert the disc (PATD-012). (Part No.: 4-225-203-01)
3. In the STOP2 mode, press the u button two times to enter
the ALL SERVO mode.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
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)
88
LCD display:
82
LCD display:
81
LCD display:
– MAIN Board (Conductor Side) –
TAP
(TEST A)
CN805
IC301
CN804
CN803
CN904
F-
LCD display:
VOLT/DIV: 0.2 V (with the 10:1 probe in use)
TIME/DIV: 1 ms
0 V
Vp-p
P-
LCD display:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 200 ns
0.6 to 1.2 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
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