Power Supply Manual Adjustment - Sony Mz-G750 Service Manual

3) Press the key to write the adjusted value.
X
4) Select the manual mode of the test mode, and set item number
862 (see page 13).
This set LCD display
V1dat
: Adjusted value
[VOL+]
5) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
01.
6) Press the key to write the adjusted value.
X
7) Select the manual mode of the test mode, and set item number
871 (see page 13).
This set LCD display
V5num
: Adjusted value
[VOL+]
8) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
20.
9) Press the X key to write the adjusted value.
10) Select the manual mode of the test mode, and set item number
872 (see page 13).
This set LCD display
V5dat
: Adjusted value
[VOL+]
11) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
39.
12) Press the X key to write the adjusted value.

5-5. Power Supply Manual Adjustment

• Adjustment sequence
Adjustment must be done with the following steps.
1. Vc PWM Duty (L) adjustment (item number 762)
2. Vc PWM Duty (H) adjustment (item number 763)
3. Vl PWM Duty adjustment (item number 764)
• Setting method of power supply manual adjustment
1. Make sure that the power supply voltage is 3V.
2. Set the test mode (see page 12).
[VOL--]
3. Press the or
.
mode.
This set LCD display
Assy 00
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4. Press the key. (the
the item number to be switched to 762.)
8 62
[VOL--]
8 71
[VOL--]
8 72
[VOL--]
key to activate the overall adjustment
0 00
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key causes
• Adjustment method of Vc PWM Duty (L)
(item number: 762)
This set LCD display
VclPWM
: Adjusted value
1. Connect a digital voltmeter to the TP901 (VC) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes G750: 2.50 ± 0.01
V, R700: 2.40 ± 0.01 V.
MAIN board
TP901(VC)
TP912(GND)
2. Press the key to write the adjusted value.
X
(The item number changes to 763 when
Adjustment and Connection Location: MAIN board
• Adjustment method of Vc PWM Duty (H)
(item number: 763)
This set LCD display
VchPWM
: Adjusted value
1. Connect a digital voltmeter to the TP901 (VC) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes G750: 2.50 ± 0.01
V, R700: 2.75 ± 0.01 V.
MAIN board
TP901(VC)
TP912(GND)
2. Press the key to write the adjusted value.
X
(The item number changes to 764 when
Adjustment and Connection Location: MAIN board
• Adjustment method of Vl PWM Duty
(item number: 764)
This set LCD display
Vl PWM
: Adjusted value
MZ-G750/R700
7 62
[VOL --]
key (voltage up) or
digital
voltmeter
key is pressed)
X
(see page 21)
7 63
[VOL --]
key (voltage up) or
digital
voltmeter
X key is pressed)
(see page 21)
7 64
key
key
19