Power Supply Manual Adjustment - Sony MZ-R500PC 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
8 62
[VOL+]
5) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
01.
This set LCD display
8 62
: Address
01: Adjusted value
6) Press the X key to write the adjusted value.
7) Select the manual mode of the test mode, and set item number
871 (see page 13).
This set LCD display
8 71
[VOL+]
8) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
20.
This set LCD display
8 71
: Address
20: Adjusted value
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
8 7 2
[VOL+]
11) Adjust with the key (adjusted value up) or
key (adjusted value down) so that the adjusted value becomes
39.
This set LCD display
8 72
: Address
39: Adjusted value
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)
V1dat
[VOL--]
S01
V5num
[VOL--]
S20
V5dat
[VOL--]
S39
• 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
0 00
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4. Press the key. (the
the item number to be switched to 762.)
• Adjustment method of Vc PWM Duty (L)
(item number: 762)
This set LCD display
7 62
[ENTER]
1. Press the key and set the address & adjusted value
display (see page 14).
This set LCD display
7 62
: Adjusted value
2. Connect a digital voltmeter to the TP902 (VC) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.40 ± 0.01 V.
MAIN board
TP902(VC)
TP910(GND)
3. 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
7 6 3
[ENTER]
1. Press the key and change the LCD display.
This set LCD display
7 63
: Adjusted value
MZ-R500/R500PC
key to activate the overall adjustment
Assy11
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key causes
Vc1PWM
AD
[VOL --]
key (voltage up) or
digital
voltmeter
key is pressed)
X
(see page 21)
VchPWM
AD
key
19