Sony MZ-R910, Service Manual

Page: 22 / 76

22
MZ-R910
1. Connect a digital voltmeter to the AP911 (VD) on the MAIN
board, and adjust
[]
key (voltage up) or
[VOLUME
--]
key (voltage down) so that the voltage becomes 1.31 ± 0.010
V.
digital
voltmeter
MAIN board
AP911 (VD)
AP912 (GND)
2. Press the X
key to write the adjusted value.
Adjustment and Connection Location: MAIN board
(see page 23)
Temperature Correction
• Adjustment method of temperature correction
1. Select the manual mode of test mode, and set the item number
015 (see page 14).
Remote commander LCD display
**
: Adjusted value
SetTmp **
015
2. Measure the ambient temperature.
3. Adjust with
[]
,
[VOLUME --]
key so that the ad-
justed value (hexadecimal value) becomes the ambient tem-
perature.
(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 :
digital voltmeter
MAIN board
laser
power meter
Optical pick-up
objective lens
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).
Remote commander LCD display
Laser
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 N
key, and set the laser MO read adjustment mode
(item number 011).
Remote commander LCD display
LrefPw **
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 resis-
tor R521 at this time is below 44 mV.
7. Press the
N
key, and set the laser CD read adjustment mode
(item number 012).
Remote commander LCD display
HrefPw **
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 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).
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 resis-
tor R521 at this time is below 80 mV.
13. Press the x
/ CHG key to quit the manual mode, and activate
the test mode (display check mode).
Adjustment and Connection Location: MAIN board
(see page 23)
Remote commander LCD display
WritPw **
013