Maintenance Of Laser Pickup (Cd); Replacement Of Laser Pickup (Cd) - JVC CA-MXS6MDR Service Manual

CA-MXS6MDR
SP-MXS6MD
Maintenance of laser pickup
(CD)
(1) Cleaning the pickup lens
Before you replace the pickup, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
(1) The level of RF output (EFM output : amplitude
of eye-pattern) will below.
Is RF output
1.25 0.22VP-P?
O.K.
(3) Semi-fixed resistor on the APC board
The semi-fixed resistor on the APC board
which is attached to the pickup is used to
adjust the laser power.
Since this adjustment should be performed
to match the characteristics of the whole
optical block, do not touch the semi-fixed
resistor.
If the laser power is lower than specified
value, the laser diode is almost worm out,
and the pickup should be replaced.
If the semi-fixed resistor is adjust while the
pickup is functioning normally, the laser
pickup may be damaged due to excessive
current.
1-40
NO
Change
YES
Replacement of laser pickup
(CD)
Turn of the power switch and, disconnect the
power cord from the AC outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in, and turn the power on.
At this time, check that the laser emits for
about 3seconds and the objective lens moves
up and down.
CAUTION : Do not observe the laser beam
directly.
Play disc
Check the eye-pattern at TP602.
Finish