Read Sony XDR-CD70DAB Service Manual online
12
XDR-CD70DAB
SECTION 4
TEST MODE
KEY AND DISPLAY CHECK MODE
Procedure:
1. Turn the main power on while pressing simultaneously three
keys of [OFF], [NAP] and [PRESET TUNING 1].
2. The microcomputer version will be displayed on the liquid
crystal display.
3. When the [SNOOZE] key is pressed once, each segment and
LEDs of LED indicator element light up all.
4. The electronic sound is output when the key is pressed except
[SNOOZE] key, and the segment and LED on the LED indicator
element corresponding to the key are turned off.
element corresponding to the key are turned off.
5. After all keys except [SNOOZE] key are pressed, Press the
[SNOOZE] key once.
6. The electronic sound is output.
7. Press the [SNOOZE] key once, release from test mode and set
7. Press the [SNOOZE] key once, release from test mode and set
is reset.
CD TEST MODE
Procedure:
1. Turn the power on.
2. Insert the CD to the set, and press the
2. Insert the CD to the set, and press the
u
key to the playback.
3. TP406 (TEST CD) on the KEY (R) board is momentarily
shorted when the CD playback.
4. When the CD test mode is activated, “82” is displayed.
5. Operate it referring to the figure below.
5. Operate it referring to the figure below.
82
STOP 2 MODE
DISPLAY key
TP406 (TESTCD)
on the KEY (R) board
is momentarily shorted
when the CD playback.
on the KEY (R) board
is momentarily shorted
when the CD playback.
F-
FOCUS 2 MODE
F-
FOCUS 1 MODE
NORMAL MODE
(CD PLAY)
(CD PLAY)
OFF key
OFF key
u
key
SLEEP key
Connecting Location:
– KEY (R) BOARD (Conductor Side) –
TP406
(TEST CD)
Fig. A.
Method of operating CD test mode
SECTION 5
ELECTRICAL CHECK
CD SECTION
Perform all CD section check in the test mode.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
CD board.
2. Insert the test disc (PATD-012). (Part No. 4-225-203-01) (CD)
3. While playing the CD, set the CD test mode (Refer to CD
3. While playing the CD, set the CD test mode (Refer to CD
TEST MODE) (Automatic adjustment value is held at this
time).
time).
4. Set the FOCUS 2 MODE.
5. Confirm that the oscilloscope waveform is as shown in the
5. 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.
6. Release the CD test mode.
7. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
7. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
8. Perform confirmation in the same manner as step 3 to 6.
• RF signal reference waveform (eye pattern)
Connecting Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
CD:
1.0 to 1.6 Vp-p
CD-RW:
1.2
1.0 to 1.6 Vp-p
CD-RW:
1.2
±
1.8 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
– CD BOARD (Conductor Side) –
IC701
TP (RF)
TP (VREF)
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