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6.3 CD ADJUSTMENT
- Precautions on Adjustment
• The unit employs a single voltage (+5V) for the
regulator, thus the reference potential of the signal is
RFOUT (approximately 2.5V) rather than GND.
Inadvertent contact of REFOUT and GND during
adjustment can result not only in disabling normal
potential measurement but also in exposing the
pickup to strong impacts due to malfunctioning of the
servo. Therefore, you are requested to observe the
following precautions.
• Make sure that the negative probe of the measuring
instrument is not connected to RFOUT or GND.
Special care must be exercised so that the channel 1
negative probe may not be connected to the
oscilloscope and the channel 2 negative probe to
GND. Since the frame of the measuring instrument is
usually at the same potential as the negative probe,
the frame of the measuring instrument must be
changed to floating status.
When RFOUT is inadvertently connected to GND, you
must immediately turn off the regulator or power
supply.
• The regulator must be turned off before mounting or
dismounting filters or wiring materials.
• You should not start adjustment or measurement
immediately after the regulator is turned on. It is
recommended to run the player for approximately
one minute so that it may stabilize.
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• When the test mode is turned on, various protective
functions from the software become unavailable.
Thus, you must make sure that undesirable electric or
mechanical shocks are not be given to the system.
• This model employs a photo-transistor for detecting
discs at their loading or ejection. Thus, if its outer
case is removed during repair work and internal parts
are exposed to light of strong intensity, malfunctions
including the following can result:
∗ The eject button becomes inoperable during play.
Pressing the eject button does not eject a disc and
play is continued.
∗ Loading becomes unavailable.
If a malfunction is recognized, appropriate remedial
actions must be taken.
changing the light source position, changing the unit
position and applying a cover to the photo-transistor.
• When you press the EJECT key to eject a disc, you
must not touch any other key until the ejection is
complete.
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- Description of the Test Mode
• Turning on the Test Mode
Replace by the CD Mechanism Module into
FX-MG8187ZT/UC or FX-MG8687ZT/UC, and refer to the
above-mentioned model's service manual (CRT3097),
then adjust and do test mode.
• Ending the Test Mode
Apply the reset (the reset will be applied three minutes
after the power is turned from off).
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