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6. ADJUSTMENT
6.1 CD ADJUSTMENT
A
1) Cautions on adjustments2) Test mode
In this product the single voltage (3.3 V) is used for the This mode is used to adjust the CD mechanism module.
regulator. The reference voltage is the REFO1 (1.65 V) To enter the test mode.
instead of the GND.While pressing the [EQ] and [DISP] keys at the same time,
If you should mistakenly short the REFO1 with the GND reset.
during adjustment, accurate voltage will not be obtained, To exit from the test mode.
and the servo?s misoperation will apply excessive shock Turn off the ACC and back up.
to the pickup. To avoid such problems:
a. Do not mix up the REFO1 with the GND when Notes:
connecting the (-) probe of measuring instruments. a. During ejection, do not press any other keys than the
Especially on an oscilloscope, avoid connecting the (-) EJECT key until the loaded disc is ejected.
B
probe for CH1 to the GND. b. If you have pressed the [?] key or [?] key during focus
b. In many cases, measuring instruments have the same search, turn off the power immediately to protect the
potential as that for the (-) probe. Be sure to set the actuator from damage caused by the lens stuck.
measuring instruments to the floating state.c. For the TR jump modes except 100TR, the track jump
c. If you have mistakenly connected the REFO1 to the GND, operation will continue even if the key is released.
turn off the regulator or the power immediately.d. For the CRG move and 100TR jump modes, the tracking
loop will be closed at the same time when the key is
Before mounting and removing filters or leads for released.
adjustment, be sure to turn off the regulator.e. When the power is turned off and on, the jump mode
is reset to the single TR (91), the RF amp gain is set to 0 dB,
For stable circuit operation, keep the mechanism and the auto-adjustment values are reset to the default
operating for about one minute or more after the settings.
C
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.
The load and eject operation is not guarantied with the
mechanism upside down. If the mechanism is blocked
D
due to mistaken eject operation, reset the product or
turn off and on the ACC to restore it.
E
F
DEH-P7900UB/XN/EW5
50
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ACEC
