MZ-E501

SECTION 5

ELECTRICAL ADJUSTMENTS

5-1. GENERAL

In this set, CD and MO discs can be automatically adjusted by setting the Overall Adjustment mode within the TEST MODE,

Before performing these automatic adjustments, it is necessary to clear the memory and adjust the power in the Manual mode.

5-2. NOTES FOR ADJUSTMENT

5-2-1. Jigs

 

CD disc

TDYS-1 (part code: 4-963-646-01)

MO disc

PTDM-1 (part code: J-2501-054-A)

 

 

or commercially available MO disc (recorded)

Digital voltmeter

5-2-2. Adjustment sequence

The adjustments should be always performed in the following sequence:

5-4. MANUAL POWER ADJUSTMENTS

5-4-1. Adjustment sequence

The adjustments should be always performed in the following sequence:

1Vc PWM Duty (L) adjustment (item No.:762)

r

2 Vc PWM Duty (H) adjustment (item No.:763) r

3 VLL PWM Duty adjustment (item No.:764)

5-4-2. Vc PWM Duty (L) adjustment method

1.

Confirm that the power voltage is at 1.5 V DC.

2.

Set the TEST MODE.

3.

To set the overall adjustment mode, press VOL– key.

1Reset NV (Clear the memory)

2Manual power adjustments

3Electrical offset adjustments (Do not enter the disc)

4Overall CD adjustments

5Overall MO adjustments

6RESUME clear

5-2-3. Power

Manual mode

Overall adjustment mode

Manual mode

LCD display

000 Assy 00

4.Press PLAY MODE key, and item No. will change to 762. LCD display

762 VclPWM XX

5. Connect a digital voltmeter to TP901 (VC) on the main board

and adjust VOL+ key (voltage up) and VOL– key (voltage

down) on the remote control.

The power is supplied with 1.5 V DC from the battery case.

5-3. RESET NV

5-3-1. How to reset NV

1.Set the TEST MODE.

2.Set the Manual mode and set the item No. 021, Reset NV. LCD display

021 Res NV CC

3.Press X key on the remote control. LCD display

021 Res OK?

4.Press X key on the remote control again. LCD display

021 Res ***

After reset is completed.

021Reset!

5.Press x key to terminate the Manual mode and return to the

TEST MODE.

Adjustment value:2.36V

Standard value:2.35 to 2.365V

MAIN BOARD (SIDE B)

digital voltmeter

TP901 (VC)

6.Press X key to write the adjustment value. Item No.will change to 763.

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Sony MX-E501 service manual Section Electrical Adjustments, Manual Power Adjustments, Reset NV