PIONEER AVIC-88DVD
Manual de Servicio

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ADJUSTMENT
DVD ADJUSTMENT
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Cautions for servicing

B

This product uses 5V and 3.3V as standard voltages. The electrical potential that is the reference for signals, is not GND, but VREF (approximately 2.2V) and VHALF (approximately 1.65V). During product adjustments, if the reference voltage is mistakenly taken as GND, and a grounding contact is made, not only would it be impossible to measure the accurate electrical potential, but also the servo motor would malfunction, resulting in the application of a strong impact on the pick up. The following precautionary measures should be strictly adhered to, in order to avoid such problems. The reference voltage and GND should not be confused when using the minus probe of a measurement device. When an oscilloscope is being used special care should be taken to make sure that the reference voltage is not connected to the probe of ch1 (on the minus side) , while the probe of ch2 (on the minus side), is connected to GND. Further, since the body frame of most measurement devices have the same electrical potential as the minus side of the probe, the body frame of the measurement device should be set to floating ground.

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If the reference voltage is connected to GND by mistake, turn the regulator OFF immediatel y, or turn the power OFF. � Remove the filters and wires used for measurements only after the regulator has been turned OFF. � After the power supply is turned on, regulator ON the following adjustment and measurement are promptly done. � Whenever the product is in the test mode, the software will not take any protective action. For this reason, special care should be taken to make sure that no mechanical or electrical shock could be applied to the product when taking measurements in the test mode. � Whenever the EJECT key is pressed to eject the disk, no other keys, other than the EJECT key, should be pressed until the disk eject action has been completed. � Press the EJECT key only after the disk has stopped completely. � If the product hangs up turn the power OFF immediately. � Laser didoes may be damaged, if the volume switch for the laser power adjustment of the pick up unit, is turned. � Test mode starting procedure The test mode can be selected from the navigation test mode. Please use the " remote control unit of the product accessory" after the test mode starts.

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AVIC-88DVD/UC
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