22
MZ-N707
POWER SUPPLY MANUAL ADJUSTMENT
• Adjustment Sequence
Adjustment must be done with the following steps.
1. Vc PWM Duty (L) adjustment (item number: 762)
r
2. Vc PWM Duty (H) adjustment (item number: 763)
r
3. Vl PWM Duty (L) adjustment (item number: 764)
r
4. Vl PWM Duty (H) adjustment (item number: 765)
r
5. Vrec PWM Duty (L) adjustment (item number: 766)
r
6. Vrec PWM Duty (H) adjustment (item number: 767)
• Setting Method of Power Supply Manual Adjustment
1. Make sure that the power supply voltage is 3V.
2. Select the manual mode of the test mode (see page 14).
3. Set item number.
• Adjustment Method of Vc PWM Duty (L)
(item number: 762)
1. Connect a digital voltmeter to the AP912 (VCO) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key (volt-
age down) so that the voltage becomes 2.40
±
0.05 V.
2. Press the
X
key to write the adjusted value.
Adjustment and Connection Location: MAIN board
(see page 25)
• Adjustment Method of Vc PWM Duty (H)
(item number: 763)
1. Connect a digital voltmeter to the AP912 (VCO) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key
(voltage down) so that the voltage becomes 2.75
±
0.05 V.
2. Press the
X
key to write the adjusted value.
Adjustment and Connection Location: MAIN board
(see page 25)
digital
voltmeter
MAIN board
AP912 (VCO)
AP602 (GND)
digital
voltmeter
MAIN board
AP912 (VCO)
AP602 (GND)
V c l P W M * *
7 62
**
: Adjusted value
Set LCD display
V c h P W M * *
7 63
**
: Adjusted value
Set LCD display
55) Select manual mode of the test mode, and set item number
873 (see page 14).
56) Adjust with the
[VOL +]
key (adjusted value up) or
[VOL --]
key (adjusted value down) so that the adjusted value becomes
BB.
57) Press the
X
key to write the adjusted value.
58) Select manual mode of the test mode, and set item number
874 (see page 14).
59) Adjust with the
[VOL +]
key (adjusted value up) or
[VOL --]
key (adjusted value down) so that the adjusted value becomes
05.
60) Press the
X
key to write the adjusted value.
V 6 n u m * *
8 73
**
: Adjusted value
Set LCD display
V 6 d a t * *
8 74
**
: Adjusted value
Set LCD display
