Sony MZ-S1 Service Manual page 23

49) Select manual mode of the test mode, and set item number
871 (see page 16).
Set LCD display
871
###S**
### : Address
** : Adjusted value
[VOL +]
50) Adjust with the
key (adjusted value down) so that the adjusted value becomes
CA.
51) Press the X key to write the adjusted value.
52) Select manual mode of the test mode, and set item number
872 (see page 16).
Set LCD display
872
###S**
### : Address
** : Adjusted value
[VOL +]
53) Adjust with the
key (adjusted value down) so that the adjusted value becomes
2D.
54) Press the key to write the adjusted value.
X
55) Select manual mode of the test mode, and set item number
873 (see page 16).
Set LCD display
873
###S**
### : Address
** : Adjusted value
[VOL +]
56) Adjust with the
key (adjusted value down) so that the adjusted value becomes
BB.
57) Press the key to write the adjusted value.
X
58) Select manual mode of the test mode, and set item number
874 (see page 16).
Set LCD display
874
###S**
### : Address
** : Adjusted value
[VOL +]
59) Adjust with the
key (adjusted value down) so that the adjusted value becomes
05.
60) Press the X key to write the adjusted value.
[VOL --]
key (adjusted value up) or
[VOL --]
key (adjusted value up) or
[VOL --]
key (adjusted value up) or
[VOL --]
key (adjusted value up) or
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 (L) adjustment (item number: 764)
r
4. Vl PWM Duty (H) adjustment (item number: 765)
r
5. Vrec PWM Duty (L) adjustment (item number: 766)
r
6. Vrec PWM Duty (H) adjustment (item number: 767)
• Setting Method of Power Supply Manual Adjustment
1. Make sure that the power supply voltage is 3V.
2. Select the manual mode of the test mode (see page 16).
3. Set item number.
• Adjustment Method of Vc PWM Duty (L)
(item number: 762)
Set LCD display
762
** : Adjusted value
1. Connect a digital voltmeter to the AP912 (VCO) on the MAIN
[VOL +]
board, and adjust key (voltage up) or
age down) so that the voltage becomes 2.40 ± 0.05 V.
MAIN board
AP912 (VCO)
AP602 (GND)
2. Press the key to write the adjusted value.
X
Adjustment and Connection Location: MAIN board
• Adjustment Method of Vc PWM Duty (H)
(item number: 763)
Set LCD display
763
** : Adjusted value
1. Connect a digital voltmeter to the AP912 (VCO) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.50 ± 0.05 V.
MAIN board
AP912 (VCO)
AP602 (GND)
MZ-S1
AD **
[VOL --]
key (volt-
digital
voltmeter
(See page 26)
AD **
[VOL --]
key (voltage up) or
digital
voltmeter
key
23