Sony MZ-R900 Service Manual - Page 18

Vc1PWM, VchPWM, Vl PWM, Assy00

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MZ-R900 7) Select the manual mode of the test mode, and set item number 871 (see page 13). Remote commander LCD display 871 V5num ** **:Adjusted value 8) Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 20. 9) Press the X key to write the adjusted value. 10) Select the manual mode of the test mode, and set item number 872 (see page 13). Remote commander LCD display 872 V5dat ** **:Adjusted value 11) Adjust with the [VOL+] key (adjusted value up) or [VOL--] key (adjusted value down) so that the adjusted value becomes 39. 12) Press the X key to write the adjusted value. Power Supply Manual Adjustment • Adjustment sequence Adjustment must be done with the following steps. 1. Vc PWM Duty (L) adjustment (item number: 762) r 2. Vc PWM Duty (H) adjustment (item number: 763) r 3. Vl PWM Duty adjustment (item number: 764) • Setting method of power supply manual adjustment 1. Make sure that the power supply voltage is 3V. 2. Set the test mode (see page 12). 3. Press the . or [VOL--] key to activate the overall adjustment mode. Remote commander LCD display 000 Assy00 4. Press the [JOG LEVER $L% r] (down) key, or [PLAYMODE] key on the remote commander. (Pressing the [JOG LEVER $L% r] (down) key, or [PLAYMODE] key on the remote commander causes the item number to be switched to 762.) • Adjustment method of Vc PWM Duty (L) (item number: 762) Remote commander LCD display 762 Vc1PWM ** **: Adjusted value 1. Connect a digital voltmeter to the AP914 (VC) on the MAIN board, and adjust [VOL +] key (voltage up) or [VOL --] key (voltage down) so that the voltage becomes 2.40 + 0.005 - 0.01 V. digital voltmeter MAIN board AP914 (VC) AP912 (GND) 2. Press the X key to write the adjusted value. (The item number changes to 763 when X key is pressed) Adjustment and Connection Location: MAIN board (see page 19) • Adjustment method of Vc PWM Duty (H) (item number: 763) Remote commander LCD display 763 VchPWM ** **: Adjusted value 1. Connect a digital voltmeter to the AP914 (VC) on the MAIN board, and adjust [VOL +] key (voltage up) or [VOL --] key (voltage down) so that the voltage becomes 2.75 ± 0.015 V. digital voltmeter MAIN board AP914 (VC) AP912 (GND) 2. 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 19) • Adjustment method of Vl PWM Duty (item number: 764) Remote commander LCD display 764 Vl PWM ** **: Adjusted value 1. Connect a digital voltmeter to the AP915 (VL) on the MAIN board, and adjust [VOL +] key (voltage up) or [VOL --] key (voltage down) so that the voltage becomes 2.30 + - 0.005 0.01 V. digital voltmeter MAIN board AP915 (VL) AP912 (GND) 18

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18
MZ-R900
•
Adjustment method of Vc PWM Duty (L)
(item number: 762)
1.
Connect a digital voltmeter to the AP914 (VC) on the MAIN
board, and adjust
[VOL°+]
key (voltage up) or
[VOL°--]
key
(voltage down) so that the voltage becomes 2.40
V.
2.
Press the
X
key to write the adjusted value.
(The item number changes to 763 when
X
key is pressed)
Adjustment and Connection Location:
MAIN board
(see page 19)
•
Adjustment method of Vc PWM Duty (H)
(item number: 763)
1.
Connect a digital voltmeter to the AP914 (VC) on the MAIN
board, and adjust
[VOL°+]
key (voltage up) or
[VOL°--]
key
(voltage down) so that the voltage becomes 2.75
±
0.015 V.
2.
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 19)
•
Adjustment method of Vl PWM Duty
(item number: 764)
1.
Connect a digital voltmeter to the AP915 (VL) on the MAIN
board, and adjust
[VOL°+]
key (voltage up) or
[VOL°--]
key
(voltage down) so that the voltage becomes 2.30
V.
digital
voltmeter
MAIN board
AP914 (VC)
AP912 (GND)
digital
voltmeter
MAIN board
AP914 (VC)
AP912 (GND)
digital
voltmeter
MAIN board
AP915 (VL)
AP912 (GND)
762
Vc1PWM **
Remote commander LCD display
**
: Adjusted value
763
VchPWM **
Remote commander LCD display
**
: Adjusted value
764
Vl PWM
**
Remote commander LCD display
**
: Adjusted value
7)
Select the manual mode of the test mode, and set item number
871 (see page 13).
8)
Adjust with the
[VOL+]
key (adjusted value up) or
[VOL--]
key (adjusted value down) so that the adjusted value becomes
20.
9)
Press the
X
key to write the adjusted value.
10) Select the manual mode of the test mode, and set item number
872 (see page 13).
11) Adjust with the
[VOL+]
key (adjusted value up) or
[VOL--]
key (adjusted value down) so that the adjusted value becomes
39.
12) Press the
X
key to write the adjusted value.
Power Supply Manual Adjustment
•
Adjustment sequence
Adjustment must be done with the following steps.
1.
Vc PWM Duty (L) adjustment (item number: 762)
r
2.
Vc PWM Duty (H) adjustment (item number: 763)
r
3.
Vl PWM Duty adjustment (item number: 764)
•
Setting method of power supply manual adjustment
1.
Make sure that the power supply voltage is 3V.
2.
Set the test mode (see page 12).
3.
Press the
.
or
[VOL--]
key to activate the overall adjustment
mode.
4.
Press the
[JOG°LEVER°$L%°°]
(down) key, or
[PLAYMODE]
key
on the remote commander.
(Pressing the
[JOG°LEVER°$L%°°]
(down) key, or
[PLAYMODE]
key on the remote commander causes the item number to be
switched to 762.)
871
V5num
**
Remote commander LCD display
**
:Adjusted value
872
V5dat
**
Remote commander LCD display
**
:Adjusted value
Remote commander LCD display
000
Assy00
r
r
+ 0.005
– 0.01
+ 0.005
– 0.01