Sony MZ-R701 Service-Handbuch - Seite 19

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Sony MZ-R701 Service-Handbuch
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 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
[END SEARCH]
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
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 2.50 ± 0.01 V.
MAIN board
TP901 (VC)
TP912 (GND)
2. Press the
X
key to write the adjusted value.
(The item number changes to 763 when
Adjustment and Connection Location: MAIN board
8 72
[VOL --]
key (adjusted value up) or
key to activate the overall adjustment
0 00
[END SEARCH]
key causes
7 62
[VOL --]
key (voltage up) or
digital
voltmeter
X
key is pressed)
(see page 20)
• 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
board, and adjust
(voltage down) so that the voltage becomes 2.50 ± 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
1. Connect a digital voltmeter to the TP902 (VL) on the MAIN
board, and adjust
(voltage down) so that the voltage becomes 2.30 ± 0.01 V.
MAIN board
TP902 (VL)
TP912 (GND)
2. When press the
plays as follows and power supply manual adjustment has com-
key
pleted.
This set LCD display
ADJ OK
Adjustment and Connection Location: MAIN board
MZ-R701/R701DPC
7 63
[VOL +]
key (voltage up) or
digital
voltmeter
key is pressed)
X
(see page 20)
7 64
[VOL +]
key (voltage up) or
digital
voltmeter
X
key to write the adjusted value, LCD dis-
0 00
(see page 20)
[VOL --]
key
[VOL --]
key
19