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MZ-G750/R700
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 N key, and set the laser MO read adjustment mode
(item number 011).
5. Check that the laser power meter reading is 0.81 ± 0.08 mW.
6. Check that the voltage both ends (TP (+) and TP (–)) of resistor
R521 at this time is below 44 mV.
7. Press the N key, and set the laser CD read adjustment
mode (item number 012).
8. Check that the laser power meter reading is 0.97 ± 0.10 mW.
9. Check that the voltage both ends (TP (+) and TP (–)) of resistor
R521 at this time is below 44 mV.
10. Press the N key, and set the laser MO write adjustment mode
(item number 013).
11. Check that the laser power meter reading is 4.95 ± 0.50 mW.
12. Check that the voltage both ends (TP (+) and TP (–)) of resistor
R521 at this time is below 80 mV.
13. Press the
x key to quit the manual mode, and activate the
test mode (display check mode).
Checking and Connection Location: MAIN board
1. Connect a digital voltmeter to the TP902 (VL) on the MAIN
board, and adjust
[VOL +] key (voltage up) or [VOL --] key
(voltage down) so that the voltage becomes 2.30 ± 0.01 V.
2. When press the X key to write the adjusted value, LCD dis-
plays as follows and power supply manual adjustment has com-
pleted.
Adjustment and Connection Location:MAIN board
5-6. Temperature Correction
• Adjustment Method of temperature correction
1. Select the manual mode of test mode, and set the mode num-
ber 014 (see page 13).
2. Measure the ambient temperature.
3. Adjust with
[VOL +], [VOL --] key so that the adjusted value
(hexadecimal value) becomes the ambient temperature.
(Initial value: 14h = 20 °C, Adjusting range: 80h to 7fh (–128
°C to +127 °C)
4. Press the X key to write the adjusted value.
5-7. Laser Power Check
Connection :
Checking Method :
1. Select the manual mode of test mode (see page 13), and set the
laser power adjusting mode (item number 010).
digital
voltmeter
MAIN board
TP902(VL)
TP912(GND)
This set LCD display
0 00ADJ OK
This set LCD display
0 14SetTmp
: Adjusted value
digital voltmete
r
MAIN board
TP(+)
TP(–)
laser
power meter
Optical pick-up
objective lens
This set LCD display
0 10Laser
This set LCD display
0 11LrefPw
: Adjusted value
This set LCD display
0 12HrefPw
: Adjusted value
This set LCD display
0 13WritPw
: Adjusted value