Sony MXD-D400 Service Manual page 31

7. AUTOMATIC SELF-DIAGNOSIS FUNCTION
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 check.
Procedure:
1. Display "AUTO CHECK" and press the
been performed. In this case, perform the laser power check (C13) and Iop Compare (C27), 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 step 4, the check will automatically be resumed from "07 CHECK".
6. After completing to test item 12, 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 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.
[YES]
button. If "LDPWR " is displayed, it means that the laser power check has not
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