MZ-E707
SECTION 5
ELECTRICAL ADJUSTMENTS
In this set, CD and MO discs can be automatically adjusted by set- ting 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.
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• | CD disc | |
• | MO disc | |
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| or commercially available MO disc (recorded) |
• | Digital voltmeter | |
5-2-2. Adjustment sequence
The adjustments should be always performed in the following sequence:
5-4-1. Adjustment sequence
The adjustments should be always performed in the following se- quence:
1Vc PWM Duty (L) adjustment (item No.:762)
r
2 Vl PWM Duty adjustment (item No.:764) r
3 Vd PWM Duty adjustment (item No.:765)
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. Set the overall adjustment mode and press PLAY MODE 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
7Rewrite the NV value
5-2-3. Power
Manual mode
Overall adjustment mode
item No. will change to 762. |
LCD display
762 VclPWM XX
4.Connect a digital voltmeter to TP901 (VC) on the main board and adjust + key (voltage up) and – key (voltage down) on the remote control.
Adjustment value:2.35V
Standard value:2.34 to 2.355V
MAIN BOARD (SIDE A)
L901 |
TP901 |
The power is supplied with 1.5 V DC from the battery case.
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.
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| L905 |
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R909 |
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| C907 | |
C921 | C909 | C910 | R910 |
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C908 |
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R903 | 28 | 25 |
| 20 | 15 | D903 |
| 29 |
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| 14 |
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C905 | 30 | IC901 |
| R964 | ||
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| 10 |
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| digital voltmeter |
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| TP901 (VC) |
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5. Press X key to write the adjustment value.
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