Temperature Correction; Laser Power Check - Sony MZ-R500PC Service Manual

MZ-R500/R500PC
2. Connect a digital voltmeter to the TP902 (VC) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.75 ± 0.01 V.
MAIN board
TP902(VC)
TP910(GND)
3. Press the key to write the adjusted value.
X
(The item number changes to 764 when
Adjustment and Connection Location: MAIN board
• Adjustment method of Vl PWM Duty
(item number: 764)
This set LCD display
7 64
[ENTER]
1. Press the key and change the LCD display.
This set LCD display
7 6 4
: Adjusted value
2. Connect a digital voltmeter to the TP901 (VL) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.30 ± 0.01 V.
MAIN board
TP901(VL)
TP910(GND)
3. When press the X key to write the adjusted value, LCD dis-
plays as follows and power supply manual adjustment has com-
pleted.
This set LCD display
0 0 0
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).
This set LCD display
0 1 4
2. Measure the ambient temperature.
20
[VOL --]
key (voltage up) or
digital
voltmeter
key is pressed)
X
(see page 21)
V1 PWM
AD
[VOL --]
key (voltage up) or
digital
voltmeter
ADJ OK
SetTmp
[VOL +]
3. Adjust with
key (hexadecimal value) becomes the ambient temperature.
(Initial value: 14h = 20 °C, Adjusting range: 80h to 7fh (–128
°C to +127 °C)
This set LCD display
14: Adjusted value
4. Press the X key to write the adjusted value.

5-7. Laser Power Check

Connection :
Optical pick-up
objective lens
MAIN board
Checking Method :
1. Select the manual mode of test mode (see page 13), and set the
laser power adjusting mode (item number 010).
This set LCD display
key
2. Press the .
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).
This set LCD display
[ENTER]
5. Press the
display (See page 14).
This set LCD display
###: Address
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.
[VOL --]
, key so that the adjusted value
S14
0 14
: Address
laser
power meter
digital voltmeter
TP(+)
TP(–)
Laser
0 10
key continuously until the optical pick-up
LrefPw
0 11
key and set the address & adjusted value
###S
0 1 1
: Adjusted value