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MZ-E900
5-4. MANUAL POWER ADJUSTMENTS
5-4-1. Adjustment sequence
The adjustments should be always performed in the following se-
quence:
1 Vc PWM Duty (L) adjustment (item No.:762)
r
2 Vc PWM duty (H) adjustment (item No.:763)
r
3 Vl 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. Set the overall adjustment mode and press PLAY MODE key,
item No. will change to 762.
LCD display
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
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:
5-2-3. Power
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
1 Reset NV (Clear the memory)
2 Manual power adjustments
3 Electrical offset adjustments
(Do not enter the disc)
4 Overall CD adjustments
5 Overall MO adjustments
6 RESUME clear
Overall adjustment mode
Manual mode
3. Press X key on the remote control.
LCD display
4. Press X key on the remote control again.
LCD display
5. Press x key to terminate the Manual mode and return to the
TEST MODE.
021 Res NV CC
021 Res OK?
021 Res ***
021 Reset!
After reset is completed.
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:2.36V
Standard value:2.35 to 2.365V
MAIN BOARD (SIDE A)
762 VclPWM XX
5. Press X key to write the adjustment value. Item No.will change
to 763.
R921
R920
R950
R901
R903
R948
R946
C918
C915
C917
C905
D903
C911
C919
C920
1
5
10
14
15202528
43
29
30
35
40
45 50 5556
42
IC901
TP901 (VC)
TP901 (VC)
digital voltmeter