MX-J570V/MX-J680V
1-35
Turn off 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.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, 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:ampli
tude of eye pattern) will below.
Is the level of
RFOUT under
1.25V
0.22Vp-p?
Replace it.
NO
YES
O.K
(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit 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 the specified value,the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup
Summary of Contents for MX-J570V
Page 64: ...MX J570V MX J680V 1 64 MEMO ...
Page 77: ...H A B C D E F G 2 12 MX J570V MX J680V n pre amplifier board ted circuit boards ...
Page 78: ...A B C D E F G 2 13 MX J570V MX J680V Power supplly input output board ...
Page 81: ...A B C D 1 2 3 4 5 MX J570V MX J680V 2 16 VCD board ...
Page 82: ...A B C 1 2 3 4 5 MX J570V MX J680V 2 17 Head amplifier board ...
Page 83: ...A B C D 1 2 3 4 5 MX J570V MX J680V 2 18 Tuner board ...
Page 95: ...A B C D 1 2 3 4 5 MX J570V MX J680V 3 12 4 1 6 30 12 10 3 B mecha A mecha ...