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A6.2 CD ADJUSTMENT
1) Cautions on adjustments2) Test mode
? In this product the single voltage (3.3V) is used for the This mode is used to adjust the CD mechanism module.
regulator. The reference voltage is the REFO1 (1.65V) ? To enter the test mode.
instead of the GND.While pressing the 4 and 6 keys at the same time, reset.
If you should mistakenly short the REFO1 with the GND ? To exit from the test mode.
during adjustment, accurate voltage will not be obtained, Turn off the ACC and back up.
and the servo's misoperation will apply excessive shock
to the pickup. To avoid such problems:Notes:
a. Do not mix up the REFO1 with the GND when a. During ejection, do not press any other keys than the
connecting the (-) probe of measuring instruments. EJECT key until the loaded disc is ejected.
BEspecially on an oscilloscope, avoid connecting the (-) b. If you have pressed the (? ) key or (? ) key during focus
probe for CH1 to the GND. search, turn off the power immediately to protect the
b. In many cases, measuring instruments have the same actuator from damage caused by the lens stuck.
potential as that for the (-) probe. Be sure to set the c. For the TR jump modes except 100TR, the track jump
measuring instruments to the floating state.operation will continue even if the key is released.
c. If you have mistakenly connected the REFO1 to the GND, d. For the CRG move and 100TR jump modes, the tracking
turn off the regulator or the power immediately.loop will be closed at the same time when the key is
released.
? Before mounting and removing filters or leads for e. When the power is turned off and on, the jump mode
adjustment, be sure to turn off the regulator.is reset to the single TR (91), the RF amp gain is set to 0dB,
and the auto-adjustment values are reset to the default
C? For stable circuit operation, keep the mechanism settings.
operating for about one minute or more after the
regulator is turned on.
? In the test mode, any software protections will not
work. Avoid applying any mechanical or electrical
shock to the mechanism during adjustment.
? The RFI and RFO signals with a wide frequency range
are easy to oscillate. When observing the signals,
insert a resistor of 1k ohms in series.
D? The load and eject operation is not guarantied with the
mechanism upside down. If the mechanism is blocked
due to mistaken eject operation, reset the product or
turn off and on the ACC to restore it.
E
F
50DEH-P450MP/XM/UC
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ACEC
