Sony MXD-D400 Service Manual page 37

Compact disc minidisc deck
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5-7-4. Auto Check
This test mode performs CREC and CPLAY automatically for
mainly checking the characteristics of the optical pick-up. To
perform this test mode, the laser power must first be checked.
Perform Auto Check after the laser power check and Iop compare.
Procedure:
1. Display "AUTO CHECK" and press the
"LDPWR
" is displayed, it means that the laser
power check has not been performed. In this case, perform the
laser power check and Iop compare, and then repeat from step
1.
2. If a disc is in the mechanical deck, it will be ejected forcibly.
"DISC IN" will be displayed in this case. Load a test disc
(MDW-74/GA-1) which can be recorded.
3. If a disk is loaded at step 2, the check will start automatically.
4. When "XX CHECK" is displayed, the item corresponding to
XX will be performed.
When "06 CHECK" completes, the disc loaded at step 2 will
be ejected. "DISC IN" will be displayed. Load the check disc
(MD) (TDYS-1).
5. When the disc is loaded in the step 4, the check will automati-
cally be resumed from "07 CHECK".
6. After completing to test item "0C check", check OK or NG
will be displayed. If all items are OK, "CHECK ALL OK"
will be displayed. If any item is NG, it will be displayed as
"NG:xxxx".
When "CHECK ALL OK" is displayed, it means that the optical
pick-up is normal. Check the operations of the other spindle motor,
sled motor, etc.
When displayed as "NG:xxxx", it means that the optical pick-up
is faulty. In this case, replace the optical pick-up.
5-7-5. Other Checks
All the following checks are performed by the Auto Check mode.
They therefore need not be performed in normal operation.
6-6. Traverse Check
6-7. Focus Bias Check
6-8. C PLAY Check
6-9. Self-Recording/Playback Check
5-7-6. Traverse Check
Note 1: Data will be erased during MO reading if a recorded disc is
Note 2: If the traverse waveform is not clear, connect the oscilloscope
[YES]
button. If
Connection:
Checking Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105
pin 6 (VC) on the BD (MD) board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Turn the
CHECK"(C14).
4. Press the
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
5. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
(Read power traverse checking)
Traverse Waveform
6. Press the
7. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
(Write power traverse checking)
Traverse Waveform
used in this adjustment.
as shown in the following figure so that it can be seen more
clearly.
BD (MD) board
330 k Ω
CN105 pin 4 (TE)
CN105 pin 6 (VC)
10 pF
oscilloscope
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
(MD) knob to display "EF MO
l AMS L
[YES]
button to display "EFB =
VC
Specified value : Below 10% offset value
IA – BI
Offset value (%) =
2 (A + B)
[YES]
button to display "EFB =
VC
Specified value : Below 10% offset value
IA – BI
Offset value (%) =
2 (A + B)
MXD-D400
oscilloscope
(DC range)
+
(DC range)
+
V: 0.1 V/div
H: 10 ms/div
MO-R".
(MD)
l AMS L
A
B
X 100
MO-W".
(MD)
l AMS L
A
B
X 100
37

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