Sony MZ-R501, Service Manual

Page: 19 / 52

19
MZ-R501/R501PC
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 12), 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. Press the
[ENTER]
key and set the address & adjusted value
display (See page 13).
6. Check that the laser power meter reading is 0.81 ± 0.08 mW.
7. Check that the voltage both ends (TP (+) and TP (–)) of resis-
tor R501 at this time is below 44 mV.
2. Connect a digital voltmeter to the TP902 (VC) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key
(voltage down) so that the voltage becomes 2.75 ± 0.01 V.
3. Press the X key to write the adjusted value.
(The item number changes to 764 when X key is pressed)
Adjustment and Connection Location: MAIN board
(see page 20)
• Adjustment method of Vl PWM Duty
(item number: 764)
1. Press the
[ENTER]
key and change the LCD display.
2. Connect a digital voltmeter to the TP901 (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.
3. 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 12).
2. Measure the ambient temperature.
digital
voltmeter
MAIN board
TP902(VC)
TP910(GND)
This set LCD display
7 6 4
V1 PWM
This set LCD display
7 6 4
AD
: Adjusted value
digital
voltmeter
MAIN board
TP901(VL)
TP910(GND)
This set LCD display
0 0 0
ADJ OK
This set LCD display
0 1 4
SetTmp
: Address
14
: Adjusted value
This set LCD display
0 1 4
S14
digital voltmeter
MAIN board
TP(+)
TP(–)
laser
power meter
Optical pick-up
objective lens
This set LCD display
0 1 0
Laser
This set LCD display
0 1 1
LrefPw
This set LCD display
0 1 1
###S
###
: Address
: Adjusted value