D-NE520
SECTION 1Ver. 1.4
SERVICING NOTES
NOTES ON HANDLING OF PATCH
NOTES ON HANDLING THE OPTICAL PICK-UPThe handling of PATCH is necessary when a mounted EGL board
BLOCK OR BASE UNIT
is exchanged or when EEPROM(IC1602) on an EGL board is
The laser diode in the optical pick-up block may suffer electrostaticexchanged.
break-down because of the potential difference generated by thePlease confirm in each service front office about the infomation on
charged electrostatic load, etc. on clothing and the human body.the handling of PATCH.
During repair, pay attention to electrostatic break-down 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
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S501. (push switch type)
The following checking method for the laser diode is operable.
Y Method:
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. With a disc not set, turn on the S501 with a screwdriver having
a thin tip as shown in Fig.1.
3. Press the u button.
4. Observing the objective lens, check that the laser diode emits
light.
When the laser diode does not emit light, automatic power
control circuit or optical pickup is faulty.
In this operation, the objective lens will move up and down 4
times along with inward motion for the focus search.
lever, detector
S501
JACK BOARDlever, detector
Fig. 1 Method to push the S501
4 |
ACEC
SONY
