DEH-P86DHR,P76DH
6.3 CD ADJUSTMENT
1)Precautions
Y This unit uses a single power supply (+5V) for the reg-Y Test mode cancellation
ulator. The signal reference potential, therefore, isSwitch ACC, back-up OFF.
connected to REFO(approx. 2.5V) instead of GND.
If REFO and GND are connected to each other by mis-Y Disc detection during loading and eject operations is
take during adjustments, not only will it be impossi-performed by means of a photo transistor in this
ble to measure the potential correctly, but the servounit.Consequently, if the inside of the unit is exposed
will malfunction and a severe shock will be applied toto a strong light source when the outer casing is
the pick-up. To avoid this, take special note of the fol-removed for repairs or adjustment, the following mal-
lowing.functions may occur.
Do not connect the negative probe of the measuring*During PLAY, even if the eject button is pressed,the
equipment to REFO and GND together. It is especiallydisc will not be ejected and the unit will remain in
important not to connect the channel 1 negativethe PLAY mode.
probe of the oscilloscope to REFO with the channel 2*The unit will not load a disc.
negative probe connected to GND.When the unit malfunctions this way, either re-posi-
Since the frame of the measuring instrument is usual-tion the light source, move the unit or cover the
ly at the same potential as the negative probe, changephoto transistor.
the frame of the measuring instrument to floating sta-
tus.Y When loading and unloading discs during adjustment
If by accident REFO comes in contact with GND,procedures, always wait for the disc to be properly
immediately switch the regulator or power OFF.clamped or ejected before pressing another key.
Otherwise, there is a risk of the actuator being
Y Always make sure the regulator is OFF when connect-destroyed.
ing and disconnecting the various filters and wiring
required for measurements.Y Turn power off when pressing the button TR+ or the
button TR- key for focus search in the test mode. (Or
Y Before proceeding to further adjustments and mea-else lens may stick and the actuator may be dam-
surements after switching regulator ON, let the playeraged.)
run for about one minute to allow the circuits to stabi-
lize.Y SINGLE/4TRK/10TRK/32TRK will continue to operate
even after the key is released.Tracking is closed the
Y Since the protective systems in the unit's software aremoment C-MOVE is released.
rendered inoperative in test mode, be very careful to
avoid mechanical and /or electrical shocks to the sys-Y JUMP MODE resets to SINGLE as soon as power is
tem when making adjustment.switched OFF.
Y Test mode starting procedure
Switch ACC, back-up ON while pressing the 4 and 6
keys together.
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