Temperature Correction; Laser Power Check - Sony MZ-N707 OpenMG Jukebox NOTES on installing & operating Service Manual

MZ-N707

TEMPERATURE CORRECTION

• Adjustment Method of Temperature Correction
1. Select the manual mode of test mode, and set the item number
015 (see page 14).
Set LCD display
0 15
: Adjusted value
2. Measure the ambient temperature.
[VOL +] [VOL --]
3. Adjust with ,
(hexadecimal value) becomes the ambient temperature.
(Initial value: 19h = 25 C, Adjusting range: 80h to 7fh (–128
C to +127 C)
4. Press the X key to write the adjusted value.

LASER POWER CHECK

• Connection
Optical pick-up
objective lens
MAIN board
TP (+)
TP (–)
• Checking Method
1. Select the manual mode of test mode (see page 14), and set
the laser power adjusting mode (item number 010).
Set LCD display
0 10
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 adjustment mode
N
(item number 011).
Set LCD display
0 11
5. Check that the laser power meter reading is 0.81
6. Check that the voltage both ends (TP (+) and TP (–)) of resis-
tor R521 at this time is below 44 mV.
24
key so that the adjusted value
laser
power meter
digital voltmeter
0.08 mW.
7. Press the key, and set the laser CD read adjustment mode
N
(item number 012).
Set LCD display
0 12
8. Check that the laser power meter reading is 0.97
9. Check that the voltage both ends (TP (+) and TP (–)) of resis-
tor R521 at this time is below 44 mV.
10. Press the N key, and set the laser MO write adjustment mode
(item number 013).
Set LCD display
0 13
11. Check that the laser power meter reading is 4.95
12. Check that the voltage both ends (TP (+) and TP (–)) of resis-
tor R521 at this time is below 80 mV.
13. Press the / key to quit the manual mode, and activate
x CHG
the test mode (display check mode).
Checking and Connection Location: MAIN board
0.10 mW.
0.50 mW.
(see page 25)