Sony MZ-N1 MP3 Player User Manual


 
23
MZ-N1
Adjustment method of Vrec PWM Duty (L)
(item number: 766)
1. Connect a digital voltmeter to the AP611 (VREC) on the MAIN
board, and adjust [VOLUME +] key (voltage up) or [VOLUME
--] key (voltage down) so that the voltage becomes 1.08 V.
2. Press the
X key to write the adjusted value.
Adjustment and Connection Location:MAIN board
(see page 24)
Adjustment method of Vrec PWM Duty (H)
(item number: 767)
1. Connect a digital voltmeter to the AP611 (VREC) on the MAIN
board, and adjust
[VOLUME +] key (voltage up) or [VOLUME
--] key (voltage down) so that the voltage becomes 1.65 to 1.70
V.
2. Press the
X key to write the adjusted value.
Adjustment and Connection Location:MAIN board
(see page 24)
Adjustment method of Vd PWM Duty
(item number: 768)
1. Connect a digital voltmeter to the AP911 (VD) on the MAIN
board, and adjust [VOLUME +] key (voltage up) or [VOLUME
--] key (voltage down) so that the voltage becomes 1.31 ± 0.010
V.
2. Press the X key to write the adjusted value.
Adjustment and Connection Location:MAIN board
(see page 24)
digital
voltmeter
MAIN board
AP611 (VREC)
AP912 (GND)
Remote commander LCD display
**
: Adjusted value
RECpwL **
766
+ 0.025
0.005
Remote commander LCD display
**
: Adjusted value
RECpwH **
767
digital
voltmeter
MAIN board
AP611 (VREC)
AP912 (GND)
Remote commander LCD display
**
: Adjusted value
VD_PWM **
768
digital
voltmeter
MAIN board
AP911 (VD)
AP912 (GND)
Temperature Correction
Adjustment method of temperature correction
1. Select the manual mode of test mode, and set the item number
015 (see page 14).
2. Measure the ambient temperature.
3. Adjust with [VOLUME +], [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 :
Checking Method :
1. Select the manual mode of test mode (see page 14), and set the
laser power adjusting mode (item number 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).
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).
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.
Remote commander LCD display
**
: Adjusted value
SetTmp **
015
digital voltmeter
MAIN board
laser
power meter
Optical pick-up
objective lens
TP (+)
TP (–)
Remote commander LCD display
Laser
010
Remote commander LCD display
LrefPw **
011
Remote commander LCD display
HrefPw **
012