Sony HCD-M333 Service Manual page 40

HCD-M333
QQ
3 7 63 1515 0
6-4. 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 ENTER/YES "R"
button. If "LDPWR
the laser power check has not been performed. In this case,
perform the laser power check and Iop Compare, and then
repeat from step1.
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 disc 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
(TDYS-1).
5. When the disc is loaded in the step 4, the check will
automatically be resumed from "07 CHECK".
6. After completing to "0C CHECK", check OK or NG will be
displayed. If all items are OK, "CHK ALL OK" will be
displayed. If any item is NG, it will be displayed as "NG:xxxx".
When "CHK ALL OK" is displayed, it means that the optical pick-
up is normal. Check the operations of other parts (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.
TE
L 13942296513
6-5. 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
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6-6. Traverse Check
Note 1:Data will be erased during MO reading if a recorded disc is
used in this adjustment.
Note 2:If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Connection:
BD board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
6 (VC) on the BD board.
2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the M "R" button to move the optical pick-up outside
the pit.
4. Press the "R" or
. >
CHECK"(C14).
5. Press the ENTER/YES "R" button to display "EFB =
Q Q
3 6 7 1 3 1 5
R".
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
"R" button.
>
(Read power traverse checking)
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
7. Press the ENTER/YES "R" button to display "EFB =
W".
8. Observe the waveform of the oscilloscope, and check that the specified
value is satisfied. Do not press the
(Write power traverse checking)
Traverse Waveform
VC
co
Specified value : Below 10% offset value
.
I A – B I
Offset value (%) =
2 (A + B)
9 4 2 8
oscilloscope
(DC range)
330 k Ω
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
"R" button to display "EF MO
MO-
0 5 8 2 9 9 4 2 8
"R" or
.
A
B
X 100
MO-
. "R" or > "R" button.
A
m
B
X 100
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