53
CDR-850
6. ADJUSTMENT
6.1 DISCS TO BE USED
1. When adjusting the servo system adjustment
CD : Test disc for adjustment (STD-903 or equivalent)
6.2 MEASURING INSTRUMENTS
(1) Laser Power Meter
Following power meter manufactured by Advantest Corporation
TQ82017,
TQ82021,
T TQ82017,
Following power meter manufactured by Leader Corporation
LE8010,
or equivalent.
(2) Oscilloscope
(3) CD Jitter Meter
6.3 TEST MODE
6.3.1 Test Mode
For adjustment, set the unit to Test mode. To enter Test mode, turn
on the unit with the Test Mode Short-Circuit pattern on the
FUNCTION Assy. In Test mode, all the displays (FL, LEDs) on
the unit should be lit. If not, turn the power off and repeat the same
steps again.
6.3.2 Operations in Test Mode
In Test mode, the following adjustment functions are assigned to
the buttons, as explained below.
LED for confirmation of
LD emission
LD emitting
LD not emitting
Switching CD, CD-R
and CD-RW
Fig.2 During adjustment of LD power (Input selector: AES/EBU)
ERASE button
¶
(RECORD) and
•
(REC MUTE)
buttons
7
(STOP) button
Set
SET button
Reset the adjusted
values
CLEAR button
+ key
– key
Stop
Focus in
Fig.3 During adjustment of servo system (Input selector: optical)
FINALIZE button
Set
SET button
Average
DIGITAL
SYNCHRO
button
Adjustment mode
switch
AUTO/MANUAL
button
¶
(RECORD)
button
Sled move
4 1
,
¡ ¢
buttons
•
(REC MUTE)
button
7
(STOP) button
Tracking close
8
(PAUSE) button
Spindle kick
3
(PLAY) button
Mode switch
ERASEbutton
6.3.3 How to Playback a Disc in Test Mode
In test mode, since the servos operate independently, playing back a
disc requires that you operate the keys in the correct order to close
the servos.
Here is the key operation sequence for playing back a disc in test
mode.
FINALIZE
Lights up the laser diode and closes the focus servo.
‘
PLAY
3
Starts the spindle motor and closes the spindle
servo.
‘
PAUSE
8
Close the tracking servo.
‘
Wait at least 2 – 3 seconds between each of these operations.
Short-circuit
Fig. 1 Enter the Test mode
SIDE B
FUNCTION ASSY
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