Read Sony ZS-YN7 Service Manual online
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
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.
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
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
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
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 (
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
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
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.
for AC range and raise vertical sensitivity.
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