MZ-E707
SECTION 5
ELECTRICAL ADJUSTMENTS
5-1. GENERAL
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 | |
The adjustments should be always performed in the following sequence:
5-4. MANUAL POWER ADJUSTMENTS
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
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. 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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