Sony Walkman MZ-N910 Service Manual page 25

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 Method :
1. Select the manual mode of test mode (see page 13), and set the
laser power adjusting mode (item number 010).
Remote commander LCD display
010 Laser
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).
Remote commander LCD display
011
LrefPw
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).
Remote commander LCD display
012
HrefPw
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).
Remote commander LCD display
013
WrPwLo
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).
Remote commander LCD display
014
WrPwHi
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
**
**
**
**
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.
Remote commander LCD display
071 V1 num **
** : Adjusted value
[VOL +]
3. Adjust with the
key (adjusted value down) so that the adjusted value becomes
11.
4. Press the X key on the set or the
commander to write the adjusted value.
5. Press the key to set item number 072.
>
Remote commander LCD display
072 V1 dat **
** : Adjusted value
[VOL +]
6. Adjust with the
key (adjusted value down) so that the adjusted value becomes
01.
7. Press the X key on the set or the
commander to write the adjusted value.
MZ-N910
Ver 1.1 2003.05
[VOL --]
key (adjusted value up) or
key on the remote
[VOL --]
key (adjusted value up) or
key on the remote
25