25
MZ-N910
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 :
Checking Method :
1. Select the manual mode of test mode (see page 13), and set the
laser power adjusting mode (item number 010).
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).
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).
7. Check that the laser power meter reading is 0.763 ± 0.13 mW.
8. Press the
>
key, and set the laser MO (
×
2 speed) write check
mode (item number 013).
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).
11. Check that the laser power meter reading is 8.81 ± 1.05mW.
12. Press the
x
key to quit the manual mode, and activate the test
mode (display check mode).
laser
power meter
Optical pick-up
objective lens
Remote commander LCD display
Laser
010
Remote commander LCD display
LrefPw **
011
Remote commander LCD display
HrefPw **
012
Remote commander LCD display
WrPwLo **
013
Remote commander LCD display
WrPwHi **
014
Ver 1.1 2003.05
Adjustment required before Overall Adjustment
Note : Modify two adjusted values through the following proce-
dure before performing the CD overall adjustment and MO
overall adjustment.
• Adjusted values modifying procedure
1. Select manual mode of the test mode, and set item number
070 (see page 13).
2. Press the
>
key to set item number 071.
3. Adjust with the
[VOL +]
key (adjusted value up) or
[VOL --]
key (adjusted value down) so that the adjusted value becomes
11.
4. Press the
X
key on the set or the key on the remote
commander to write the adjusted value.
5. Press the
>
key to set item number 072.
6. Adjust with the
[VOL +]
key (adjusted value up) or
[VOL --]
key (adjusted value down) so that the adjusted value becomes
01.
7. Press the
X
key on the set or the key on the remote
commander to write the adjusted value.
071
V 1 n u m * *
Remote commander LCD display
**
: Adjusted value
072
V 1 d at * *
Remote commander LCD display
**
: Adjusted value
