Sony MZ-S1 service manual 871###S, 872###S, 873###S, 874###S, 762AD, 763AD, Adjustment Sequence

49)Select manual mode of the test mode, and set item number 871 (see page 16).

Set LCD display

871###S**

###: Address

**: Adjusted value

50)Adjust with the [VOL +] key (adjusted value up) or [VOL --]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

53)Adjust with the [VOL +] key (adjusted value up) or [VOL --]key (adjusted value down) so that the adjusted value becomes 2D.

54)Press the X key to write the adjusted value.

55)Select manual mode of the test mode, and set item number 873 (see page 16).

Set LCD display

873###S**

###: Address

**: Adjusted value

56)Adjust with the [VOL +] key (adjusted value up) or [VOL --]key (adjusted value down) so that the adjusted value becomes BB.

57)Press the X key to write the adjusted value.

58)Select manual mode of the test mode, and set item number 874 (see page 16).

Set LCD display

874###S**

###: Address

**: Adjusted value

59)Adjust with the [VOL +] key (adjusted value up) or [VOL --]key (adjusted value down) so that the adjusted value becomes 05.

60)Press the X key to write the adjusted value.

MZ-S1

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

762AD **

**: Adjusted value

1.Connect a digital voltmeter to the AP912 (VCO) on the MAIN

board, and adjust [VOL +] key (voltage up) or [VOL --]key (volt- age down) so that the voltage becomes 2.40 ± 0.05 V.

digital voltmeter

MAIN board

AP912 (VCO)

AP602 (GND)

2. Press the X key to write the adjusted value.

Adjustment and Connection Location: MAIN board (See page 26)

•Adjustment Method of Vc PWM Duty (H) (item number: 763)

Set LCD display

763AD **

**: Adjusted value

1.Connect a digital voltmeter to the AP912 (VCO) on the MAIN

board, and adjust [VOL +] key (voltage up) or [VOL --]key (voltage down) so that the voltage becomes 2.50 ± 0.05 V.

digital voltmeter

MAIN board

AP912 (VCO)

AP602 (GND)

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