Sony MZ-B10 Service Manual page 27

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 con-
firmed 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 16), and set the
laser power check mode (item number 010).
Set LCD display
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).
Set LCD display
LrefPw 16
16 : Initial value
5. Check that the laser power meter reading is 0.800 ± 0.10 mW.
6. Press the > key, and set the laser CD read adjustment mode
(item number 012). Modify the adjusted value to 18 with the
[SPEED CONTROL +]
or
Set LCD display
HrefPw 18
18 : Initial value
7. Check that the laser power meter reading is 0.910 ± 0.11 mW.
8. Press the key, and set the laser MO (X2 speed) write
>
check mode (item number 013). Modify the adjusted value to
[SPEED CONTROL +]
85 with the
-]
key.
Set LCD display
WrPwLo 85
85 : Initial value
laser
power meter
010
011
[SPEED CONTROL --]
key.
012
[SPEED CONTROL -
or
013
9. Check that the laser power meter reading is 4.95 ± 0.59 mW.
10. Press the key, and set the laser MO (X4 speed) write
>
check mode (item number 014). Modify the adjusted value to
[SPEED CONTROL +]
9E with the
-]
key.
Set LCD display
WrPwHi 9E
9E : Initial value
11. Check that the laser power meter reading is 5.93 ± 0.71mW.
12. Press the x key to quit the manual mode, and activate the
test mode (display check mode).
Overall Adjustment Mode
• Configuration of Overall Adjustment Mode
Overall adjustment mode
x
(Title display)
"Assy**"
Continuing overall adjustment
key
.
> key
key or
N
u key
on the remote commander
[SPEED CONTROL +]
[DISPLAY]
key
on the remote commander
[SPEED CONTROL -]
[P MODE]
key
on the remote commander
[GROUP]
key or
key
on the remote commander
MZ-B10
Ver 1.1 2003.06
[SPEED CONTROL -
or
014
key
CD overall
adjusting
MO overall
adjusting
Automatic
Disc
discrimination
overall
adjustment
key or
Electrical
offset
adjustment
key or
Temperature
correction
and
Power supply
adjustment
auto item feed
NV reset
(item number 21)
27