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MDX-G1
QQ
3 7 63 1515 0
2. Laser Power Check
No.
Key
1 4 ¢
2 MD 6
3 MD 6
4 MD 6
(optical pick-up label)
KMS
✽ In this case, lop = 82.5 mA
lop(mA) = Reading of digital voltmeter(mV)/1(Ω)
6-7 EF Balance(Traverse Adjustment)
Connection :
X33
ADJUSTMENT
TE1
VC
1. Recordable Disc
TE
No.
Key
L 13942296513
1
Connect the oscilloscope to TE1 and VC in X33 pcb
2 4 ¢
Select [EFBAL ADJU]
3
Load the recordable disc
4 MD 6
[EFBAL MO-W]
5 MD 6
[EF=$✻✻MOW]
6 4 ¢
Write power adjustment. Adjust the waveform as follows.
7 MD 6
Display shows [EF=$✻✻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 MD 6
Save the data in E2PROM.
Display shows [EFBAL MO-P]
MD 6
Display shows [EF=$✻✻MOP]
(Pickup travels to search pits and tune the servo to on.)
10 4 ¢
Adjust the waveform as follows.
11 MD 6
Display shows[EFB=✻✻xSAVE]
to save the data in E2PROM.
Display shows [EFBAL CHAN]
12 EJECT
Unload disc.
2. Pre Master Test Disc(TGYS-1)
No.
Key
1
Load the disc(TGYS-1). [EFBAL CD]
2 MD 6
[EF=$✻✻CD] servo is on
3 4 ¢
Adjust the waveform as follows.
MD 6
4
Save the data in E2PROM.
Display shows[EFB=✻✻xSAVE] in brief time.
[EF PHASE]
5 EJECT
Unload disc.
www
6
CIRCUIT DESCRIPTION
Display/Function
[LDPWR CHEC]
[(c0.9mW) $xx]
(xx=0.85 to 0.95mW)
[(c7.0mW) $xx]
Laser power meter: 7.0±1.0mW✽
VOM:optical pickup indication value ±10%✽
[LDPWR CHEC]
260B
27x40
B0825
Oscilloscope
+
-
V: 0.5V/div H: 10ms/div
INPUT: DC mode
Display/Function
Display/Function
x
ao
y
.
i
8
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)
(VC)
6-8 Automatic EF Balance Adjustment
• Automatic EF balance adjustment is performed.
Q Q
No.
Key
3
6 7
1 3
1 4 ¢
2
3 MD 6
4
5
6
7
8
u163
9
0
.
2 9
9 4
2 8
Oscilloscope
330kΩ
+
-
10pF
Display/Function
1 5
0 5
8
2 9
9 4
TE B. ADJ
Load a recordable disc.
TE B. MO-W (Automatic Adjustment
Mode Indication) = Low Reflection
• Groove
• Writing Power
Automatic Adjustment
Display shows EFB = XXX SAVE
in brief time and save the data in
E2PROM.
Next step
TE B. MO-R (Automatic Adjustment
Mode Indication) = Low Reflection
• Groove
• Reading Power
Automatic Adjustment
Display shows EFB = XXX SAVE
in brief time and save the data in
E2PROM.
Next step
TE B. MO-P (Automatic Adjustment
Mode Indication ) = Low Reflection • PIT
• Reading Power
Automatic Adjustment
Display shows EFB = XXX SAVE
m
in brief time and save the data in
E2PROM.
co
Next step
EFBAL CHANGE (Unload a disc)
Load a pre-master test disc(TGYS-1).
9 9
2 8
9 9
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