Servicing Note - Sony MCE-F88K Service Manual

HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
Insert a tapering driver into the aperture of the unit bottom, and turn
in the direction of arrow.
* To close the disc table, turn the driver in the reverse direction.
Pull out disc table.
SELF DIAGNOSIS
This unit is equipped with a self-diagnosis function for diagnosing
the state of the circuits in the VIDEO board.
The function is useful for determining if the circuitis normal or
abnormal according to the Ilt state of D502 of the VIDEO board.
Lighting of D502
When lit : Operates normally
When Blinking repeatedly: The circuit may be faulty.
[VIDEO BOARD] (SIDE A)
D502
SECTION 1

SERVICING NOTE

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer
electrostatic breakdown because of the potential difference
generated by the charged electrostatic load, etc. on clothing and
the human body.
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the "S curve check" in "CD section adjustment" and
check that the S curve waveform is output two times.
IC505
IC507
3