Sony MZ-R701, Руководство по обслуживанию

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MZ-R701/R701DPC
10) Select the manual mode of the test mode, and set item number
872 (see page 13).
11) Adjust with the
[VOL +]
key (adjusted value up) or
[VOL --]
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.
• 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).
3. Press the
.
or
[VOL --]
key to activate the overall adjustment
mode.
4. Press the
[END SEARCH]
key. (the
[END SEARCH]
key causes
the item number to be switched to 762.)
• Adjustment method of Vc PWM duty (L)
(item number: 762)
1. Connect a digital voltmeter to the TP901 (VC) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key
(voltage down) so that the voltage becomes 2.50 ± 0.01 V.
2. Press the X key to write the adjusted value.
(The item number changes to 763 when
X
key is pressed)
Adjustment and Connection Location: MAIN board
(see page 20)
This set LCD display
8 72
V5dat
: Adjusted value
2. Vc PWM Duty (H) adjustment (item number 763)
3. Vl PWM Duty adjustment (item number 764)
1. Vc PWM Duty (L) adjustment (item number 762)
This set LCD display
0 00
Assy 00
This set LCD display
7 62
VclPWM
: Adjusted value
digital
voltmeter
MAIN board
TP901 (VC)
TP912 (GND)
This set LCD display
7 63
VchPWM
: Adjusted value
digital
voltmeter
MAIN board
TP901 (VC)
TP912 (GND)
This set LCD display
7 64
Vl PWM
: Adjusted value
• Adjustment method of Vc PWM duty (H)
(item number: 763)
1. Connect a digital voltmeter to the TP901 (VC) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key
(voltage down) so that the voltage becomes 2.50 ± 0.01 V.
2. Press the
X
key to write the adjusted value.
(The item number changes to 764 when
X
key is pressed)
Adjustment and Connection Location: MAIN board
(see page 20)
• Adjustment method of Vl PWM duty
(item number: 764)
1. Connect a digital voltmeter to the TP902 (VL) on the MAIN
board, and adjust
[VOL +]
key (voltage up) or
[VOL --]
key
(voltage down) so that the voltage becomes 2.30 ± 0.01 V.
2. When press the X key to write the adjusted value, LCD dis-
plays as follows and power supply manual adjustment has com-
pleted.
Adjustment and Connection Location: MAIN board
(see page 20)
digital
voltmeter
MAIN board
TP902 (VL)
TP912 (GND)
This set LCD display
0 00
ADJ OK