Cd Section - Sony ZS-YN7 Service Manual

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 button.
x
4. Set test mode by momentarily shorting both of TAP (TEST A)
on the MAIN board to enter the CD test mode.
LCD display:
88
5. Press the button, and press the
u
STOP2 mode.
LCD display:
82
Note: When the following figure is displayed accidentally, release from
the CD test mode and redo operation.
LCD display:
81
6. To release the CD test mode, press the
power off.
Checking Location:
– MAIN Board (Conductor Side) –
CN804
IC301
14
button to enter the
x
button, and turn the
x
CN803
CN904
TAP
(TEST A)
CN805
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
mode.
LCD display:
F-
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.
VOLT/DIV: 0.2 V (with the 10:1 probe in use)
TIME/DIV : 1 ms
0 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
the ALL SERVO mode.
LCD display:
P-
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)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 200 ns
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
button to enter the FOCUS1
u
Vp-p
button two times to enter
u
0.6 to 1.2 Vp-p