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7. GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 TEST MODE
1) Precautions on Adjustment
• Because this equipment uses a single voltage (+5 V) in
the regulator, the reference voltage of a signal is not
GND, but is REFO (VR21, VR25, PREF). If REFO and
GND are mixed and touched at product adjustment,
correct potential cannot be measured but also the
servo malfunctions and an strong shock applies to the
pickup. So, note the following items. REFO and GND
must not be mixed on the negative side of the probe
of the measuring apparatus. In particular, do not
connect the negative side of the ch1 probe of the
oscilloscope to REFO and the negative side of the ch2
probe to GND. Further, in general, because most
main units of measuring apparatuses reach the same
potential as the negative side of the probe, make the
main unit of the measuring apparatus enter the
floating state. If REFO and GND are incorrectly
connected, immediately turn off the power.
• Be sure to turn off the power when attaching and
detaching the various filters and wire materials
required for measurement.
• For the adjustment and measurement after power-on,
adjust or measure after having performed running for
about one minute until the circuit becomes stable.
• Because various types of protection do not operate by
software in the test mode, do not apply a mechanical
and electrical shock during adjustment.
• This equipment uses a photo transistor to detect a
disc when inserting and removing it to and from the
tray.
Accordingly, if strong light enters this
equipment with the case remove at repair and
adjustment, the following malfunctions may occur.
* Although there is a disc, play is disabled because
the disc cannot be used.
* A disc of 12 cm is incorrectly detected for a disc of
8 cm.
When a malfunction occurred, take action such as
changing the position of the light source, changing
the orientation of this equipment or covering a photo
transistor.
• In the test mode, after having executed carriage
movement during focus search, immediately turn off
the power. (The lens is stuck up or down and the
actuator may be damaged by fire.)
• During disc replacement, press the key of the disc to
be replaced by a new one.
2) Test Mode
• The test mode is used for adjusting the mechanical-
unit module section of this equipment.
• How to enter the test mode
Simultaneously pressing the key 4 and the key 6,
enter Reset.
• How to reset the test mode
Enter ACC and backup OFF.
• After having executed carriage movement during
focus search, immediately turn off the power.
(Because the lens is stuck, the actuator may be
damaged by fire.)
• The TR Jump below 255 TR continues operation even
if the key is detached. Other TR Jumps enter the T
Close state when the key is detached.
• As soon as the power is turned on/off, the Jump Mode
is reset to Single TR and the automatic adjustment
value returns to the initial value.
• During disc replacement, press the key of the disc to
be replaced by a new one.
• Be sure to load a DVD disc on the first tray of the
magazine.
3) Explanation of the flowchart
The operation and specifications of each command
are described.
• The 8-digit value in each command box is the number
of the command and is displayed on the main unit.
• The horizontal (left or right) movement of each
command is performed using the TR up/down key of
the main unit.
• The execution of each command is performed using
the BAND key of the head unit. At this time, the
return value indicating that the command was
executed is displayed on the main unit. If "E" is
displayed in the high-order digit of the return value, it
indicates that an error occurred in the command and
the command was not executed.
• After having executed each command, press the
BAND key of the main unit to execute the command
of the next step. At this time, the number of the
command of the next step is displayed on the main
unit.
• The explanation about the operation of each
command box is given below.
System Controller/Mechanism Controller Test Start
Move to the test mode. No return value is provided.
Test Start
Start the test mode. The return value is 00000000.
Disc Type
Select the type of the disc using the key 1 or key 2
Toggle selection.
The return value is 00000000 when selecting CD,
00000001 when selecting the DVD1 layer, 00000002
when selecting the DVD2 layer or 00000003 for other
cases.
Power ON
Turn on each power. Use the key 1 or key 2 to select
whether or not the adjustment of servo system offset
is performed. If the fourth digit from the bottom is
XDV-P9
: 00860000
: 10940000
: 20070000
: 20060000
73
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