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3. Laser Power Adjustment
Test point: Pickup laser output
Jig: Laser power meter
Adjusting procedure:
1) Press the "MD EDIT" button three times in the state of "ALL SV OFF" in order to switch the display to "LASER WRITE".
2)
Press the Il button once to show the "LASER = $**".
3)
Measure the laser output of the pickup unit using a laser power meter. Adjust the laser output value for 6.840.03 mW by pressing
the >» and << buttons. After adjustment, press the "ENTER" button.
4)
After the adjustment is completed, press the IN button to return to the."ALL SV OFF" state.
Note:
If the laser output exceeds 7.0 mW, the pickup may be damaged.
. Auto Sequence Adjustment (EFB Adjustment, IVR Adjustment, Focus AGC Adjustment and
Tracking AGC Adjustment)
Test disc: MDW-60, TGYS-1
When using the MO disc for adjustment:
J)
Insert the test disc MDW-60.
2)
Press the Ml button to show "ALL SV OFF"
on display.
3)
Press the "MODE" button to show "SELECT GRV" on display.
4)
When the "MD function" button is pressed, "AUTO ADJ" is displayed. When the adjustment is completed, "DONE" is
displayed. (If "FAILED" is displayed, it shows that the adjustment has failed and is not performed.)
5)
After the adjustment is completed, press the IN button to return to the "ALL SV OFF" state.
Note:
1. Be sure to use the clean disc because the adjustment cannot be ensured if the dirty disc or the scratches on a disc is used.
2. Be sure to use an MO disc that is permitted to record a new data because the MO disc is tested by writing power and a part
of the recorded data is erased.
How to check the IVR, EFB, Focus/Tracking/Sled Gains
@)
Move the optical pickup to the center track or its around of a disc using the >» and the << buttons.
@) Press the € > button to show "FOCUS ON!" on display.
@
Press the "ENTER" button to switch the mode to "ALL SV ON".
@) Press the Ml button and press twice the "DISPLAY" button.
Check that the indication value on the display "IV$**:EF$O©" is within the range as follows below.
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©) Press the "DISPLAY" button again.
Check that the indication value on the display "Gf**t##tsAA" is within the following ranges.
iba
20 to 40
"
15 to 35
"AA"
15 to 35
©
After the checking is completed, press the Ml button to return to the "ALL SV OFF" state.
When using the PIT disc for adjustment:
1)
Insert the test disc TGYS-1.
2)
Press the lf button to show "ALL SV OFF" on display.
3)
When the "MD function" button is pressed, "AUTO ADJ"
is shown on display. When adjustment is completed, "DONE" is
displayed. (If "FAILED" is displayed, it shows that the adjustment has failed and is not performed.)
4)
After the adjustment is completed, press the Il button to return to the "ALL SV OFF" state.
Checking Method of IVR, EFB, Focus/Tracking/Sled Gain
Perform the same operation as that of the "When using the MO disc for adjustment" and confirm that the values on the display are
within the following ranges.
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SFB? ai ssadasacsiassrevesassetesversetans 09 to 12
"FOCUS Gain" ......sccscesserserseeeees 2A to 45
"Tracking 24in" 0...
20 to 40
"Sled gain" 0... cece
20 to 40
45
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