MZ-E505
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.
5-2. NOTES FOR ADJUSTMENT
|
| |
• | CD disc | |
• | MO disc | |
|
| or commercially available MO disc (recorded) |
•Digital voltmeter
•Ammeter
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 se- quence:
1Vc PWM Duty (L) adjustment (item No.:762)
r
2 Vl PWM Duty adjustment (item No.:764) r
3 Vb A/D value check (item No.:731)
5-4-2. Vc PWM Duty (L) adjustment
Connection:
digital voltmeter
MAIN board
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
TP901 (VC)
TP921 (GND) 
Procedure:
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 PLAYMODE key, item No. will change to 762.
LCD display
762 VclPWM XX
4.Connect a digital voltmeter to TP901 (VC) and TP921 (GND) on the main board and adjust VOL + (voltage up) and VOL –
(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
Adjustment value:2.35V
Standard value:2.34 to 2.355V
5. Press X key to write the adjustment value.
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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