Sony DCM-M1 Service Manual page 155

2. Mecha. Deck Block Primary Check
The following parts of the mecha. deck block can be checked in a
simple check.
• Laser diode
• Focus coil
• Spindle motor
• Disc type check switch
• Sled motor
• Tracking coil
• INITIAL SW
• HEAD UP/DOWN motor
• INITIAL SW
Note: To check the operation of mecha. deck block, remove the
Upper Panel Assembly. (See 2. Removal on page 2-9)
A
C
D
X
Spindle Motor
MD1/MD2
PIT/GRV
PROTECT SW
Fig.7-1-22
– 15 –
Checking method
1) In the normal mode, set the POWER switch to "CAMERA".
2) Check that "DISC LID IS OPEN" is displayed on the LCD
screen.
3) Press the part to check that the part
A
moves up and down. (Laser diode check, Focus coil check)
Also, check that the spindle motor rotates at this time. (Spindle
motor check)
Note: If the part is released once and then pressed again, the
A
operation restarts though the operation time is short.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
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 emis-
sion, observe from more than 30 cm away from the objective lens.
B
OPTICAL PICK-UP block
lights in red and
B