AVX-P7300DVD
6. ADJUSTMENT
6.1 VOLTAGE ADJUSTMENT FOR DVD MECHANISM
Adjustment Point
?10mV
TP269
DC V meter3.385V
TP265
FRONT
6.2 DVD MECHANISM MODULE
Y Remove the filters and wires used for measurements
Cautions for servicing
This product uses 5V and 3.3V as standard voltages.only after the regulator has been turned OFF.
The electrical potential that is the reference for signals,Y After the power supply is turned on, regulator ON the
following adjustment and measurement are promptly
is not GND, but VREF (approximately 2.2V) and VHALF
done.
(approximately 1.65V).
During product adjustments, if the reference voltage isY Whenever the product is in the test mode, the software
mistakenly taken as GND, and a grounding contact iswill not take any protective action. For this reason,
special care should be taken to make sure that no
made, not only would it be impossible to measure the
mechanical or electrical shock could be applied to the
accurate electrical potential, but also the servo motor
would malfunction, resulting in the application of aproduct when taking measurements in the test mode.
Y Whenever the EJECT key is pressed to eject the disk,
strong impact on the pick up. The following
no other keys, other than the EJECT key, should be
precautionary measures should be strictly adhered to,
in order to avoid such problems.pressed until the disk eject action has been
The reference voltage and GND should not be confusedcompleted.
Y Press the EJECT key only after the disk has stopped
when using the minus probe of a measurement device.
completely.
When an oscilloscope is being used special care should
be taken to make sure that the reference voltage is notY If the product hangs up turn the power OFF
immediately.
connected to the probe of ch1 (on the minus side),
Y Laser didoes may be damaged, if the volume switch for
while the probe of ch2 (on the minus side), is connected
to GND. Further, since the body frame of mostthe laser power adjustment of the pick up unit, is turned.
measurement devices have the same electrical potentialY Please connect with the head unit of the IP BUS
comformity and do the test mode.
as the minus side of the probe, the body frame of the
Attention)
measurement device should be set to floating ground.
If the reference voltage is connected to GND byThere is a head unit that the test mode does not operate.
Y Test mode starting procedure
mistake, turn the regulator OFF immediately, or turn the
Reset while pressing the 4 and 6 keys together.
power OFF.
Please use the " remote control unit of the product
accessory" after the test mode starts.
80 |
ACEC
PIONEER
