(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 be low.
Replacement of laser pickup
Replace it.
NO
YES
(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.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Test mode is set according to the procedure
described to the adjustment method.
The laser power adjust.
The disc adjust.
End
Dose
recording laser
power (0.68mW) is
output at test
mode?
Replace it.
NO
YES
O.K
Dose
driving current of
the laser diode is
60mA or
less?
Maintenance of laser pickup
Содержание KD-MX2900R
Страница 50: ...1 2 3 1 Vout 2 GND 3 Vin VREF 2 GND 1 VOUT VIN 3 S 81332HG KC X IC491 Regulator 1 Pin layout 2 Block diagram ...
Страница 53: ...1 2 3 IN B IN A Vss 5 4 VDD OUT X A B Vcc GND Y TC7S08F W IC330 Buffer 1 Pin layout 2 Block diagram ...
Страница 54: ...1 2 3 4 8 7 6 5 Vcc G Y1 A2 G A1 Y2 GND TC7WT241FU X IC471 472 Buffer 1 Pin layotu Blocl diagram ...
Страница 64: ...Printed circuit boards Main board old type Forward side Main board old type Reverse side ...
Страница 65: ...Main board new type Forward side Main board new type Reverse side ...
Страница 66: ...MD CD Servo board Forward side Switch board Forward side ...
Страница 67: ...MD CD Servo board Reverse side Switch board Reverse side ...