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AM-NX1
Laser Power Check
Note: If result of measurement of the laser power does not satisfy the
specification, either replace the OP (optical pick-up unit) or check
whether the laser circuit block is working correctly.
When the result of laser power measurement does not satisfy the
specification even though the laser circuit block is confirmed to be
working correctly, replace the OP (optical pick-up unit).
• Connection
optical pick-up
objective lens
• Checking and adjusting method
1. Select the manual mode of test mode (see page 12), and set the
laser power checking mode (item number 010).
LCD display
010
L a s e r
2. Press the
key continuously until the optical pick-up
.
moves to the most inward track.
3. Open the cover and set the laser power meter on the objective
lens of the optical pick-up.
4. Press the
key, and set the laser MO read check mode
>
(item number 011).
LCD display
011
L r e f P w
5. Check that the laser power meter reading is 0.572 ± 0.10 mW.
6. Press the
>
key, and set the laser CD read check mode (item
number 012).
LCD display
012
H r e f P w
7. Check that the laser power meter reading is 0.763 ± 0.13 mW.
8. Press the
key, and set the laser MO (X2 speed) write
>
check mode (item number 013).
LCD display
013
W r P w L o
9. Check that the laser power meter reading is 7.34 ± 0.88 mW.
10. Press the
key, and set the laser MO (X4 speed) write
>
check mode (item number 014).
LCD display
014
W r P w H i
11. Check that the laser power meter reading is 8.81 ± 1.05 mW.
12. Press the
x
key to quit the manual mode, and activate the
test mode (display check mode).
24
laser
power meter
* *
* *
* *
* *
Adjustment Required Before Overall Adjustment
Change the following adjustment value of two items before over-
all adjustment.
1. Select the manual mode of test mode (see page 13), and set
item number 865.
[VOL +]
2. Adjust with the
key (adjusted value down) so that the adjusted value becomes
1F.
3. Press the
key to write yhe adjustment value.
–
4. Set item number 866.
[VOL +]
5. Adjust with the
key (adjusted value down) so that the adjusted value becomes
2C.
6. Press the
–
key to write yhe adjustment value.
7. Press the
x
key to return the test mode (display check mode).
Overall Adjustment Mode
• Configuration of Overall Adjustment Mode
Overall adjustment mode
(Title display)
"Assy**"
Continuing overall adjustment
key
.
>
key
key
u
[DISPLAY]
key
[P MODE]
key
+
key
[VOL --]
key (adjusted value up) or
[VOL --]
key (adjusted value up) or
x
key
CD overall
adjusting
MO overall
adjusting
DISC
automatic
distination
overall
adjusting
mode
Electrical
offset
adjustment
Temperature
correction
and
Power supply
adjustment
auto item feed
NV reset
(item number: 021)
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