MDX-01/02
6
CIRCUIT DESCRIPTION
1. Recordable Disc
No.
Key
Display/Function
1
Connect the oscilloscope to TE1 and VC in X33 pcb
2
4
¢
Select [EFBAL ADJU]
3
Load the recordable disc
4 PLAY
[EFBAL MO-W]
5 PLAY
[EF=$
✻✻
MOW]
6
4
¢
Write power adjustment. Adjust the waveform as follows.
7 PLAY
Display shows [EF=$
✻✻
MOR] after [EFB=
✻✻
xSAVE]
to save the data in E2PROM.
Mode changes write to read
Focus and disc servo are on. Tracking servo off.
8
4
¢
Read power adjustment. Adjust the waveform as follows.
9 PLAY
Save the data in E2PROM.
Display shows [EFBAL MO-P]
PLAY
Display shows [EF=$
✻✻
MOP]
(Pickup travels to search pits and tune the servo to on.)
10
4
¢
Adjust the waveform as follows.
11 PLAY
Display shows[EFB=
✻✻
xSAVE]
to save the data in E2PROM.
Display shows [EFBAL CHAN]
12 EJECT
Unload disc.
2. Pre Master Test Disc(TGYS-1)
No.
Key
Display/Function
1
Load the disc(TGYS-1). [EFBAL CD]
2 PLAY
PLAY
[EF=$
✻✻
CD] servo is on
3
4
¢
Adjust the waveform as follows.
4
Save the data in E2PROM.
Display shows[EFB=
✻✻
xSAVE] in brief time.
[EF PHASE]
5 EJECT
Unload disc.
During this adjustment, the oscilloscope changes in units
of about 2%. Adjust so that the waveform comes nearest
to the specified value. (MO groove read power traverse
adjustment)
(Traverse waveform)
Specification : A = B
Notes :
1. Data is erased during MO write when a recorded disc is
used for this adjustment.
2. If the traverse waveform is difficult to be monitored, con-
nect an oscilloscope as shown in the figure below.
(TE1)
330k
Ω
10pF
(VC)
Oscilloscope
+
-
5-7 EF Balance(Traverse Adjustment)
TE1
VC
Oscilloscope
X33
ADJUSTMENT
+
-
V: 0.5V/div H: 10ms/div
INPUT: DC mode
+
-
Laser
power meter
Digital
voltmeter
Objective lens of
optical pick up
IOP2
IOP1
X33
ADJUSTMENT
1. Laser Power Adjustment
No.
Key
Display/Function
1
4
¢
[LDPWR ADJU]
Load recordable disc
2
Load the disc and lazer on
[(a0.9mW) $xx] read power
(xx=power value)
4
3
EJECT
PLAY
Unload the disc and laser on
5 PLAY
[LDPWR CHECK]
6
1
¡
Move the pickup to check the laser power with
laser power meter sensor
7
4
¢
Adjust "xx" so that the power meter shows 0.9mW.
8 PLAY
[(a7.0mW) $xx] writing power
9
4
¢
Adjust "xx" so that the power meter shows 7.0mW.
This adjustment should be carried out in 15 secs.
10 PLAY
Laser power off
Display shows [LDPWR ADJUST] after [LDPWR<$xx]
to save the data in E2PROM
Start from No.2 if readjust.
2. Laser Power Check
No.
Key
Display/Function
1
4
¢
[LDPWR CHEC]
2 PLAY
[(c0.9mW) $xx]
(xx=0.85 to 0.95mW)
3 PLAY
[(c7.0mW) $xx]
Laser power meter: 7.0
±
1.0mW
✽
VOM:optical pickup indication value
±
10%
✽
lop(mA) = Reading of digital voltmeter(mV)/1(
Ω
)
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