Sony MZ-R91 Service Manual page 19

• Adjustment method of VC PWM Duty (L)
(mode number: 762)
1. Select the manual mode of the test mode, and set the mode
number 762. (See page 12)
LCD display
V c l P W M
762
2. Connect a digital voltmeter to the TP915 (VC) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.5 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP915 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
• Adjustment method of VREM PWM Duty (H)
(mode number: 763)
1. Select the manual mode of the test mode, and set the mode
number 763. (See page 12)
LCD display
V r h V c l
763
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.75 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP914 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
• Adjustment method of VREM PWM Duty (L)
(mode number: 764)
1. Select the manual mode of the test mode, and set the mode
number 764. (See page 12)
LCD display
V r l V c l
764
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
[VOL +]
board, and adjust
(voltage down) so that the voltage becomes 2.5 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP914 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
[VOL --]
key (voltage up) or
digital
voltmeter
[VOL --]
key (voltage up) or
digital
voltmeter
[VOL --]
key (voltage up) or
digital
voltmeter
• Adjustment method of VC PWM Duty (H)
(mode number: 765)
1. Select the manual mode of the test mode, and set the mode
number 765. (See page 12)
LCD display
V c h P W M
765
2. Connect a digital voltmeter to the TP915 (VC) on the MAIN
key board, and adjust
(voltage down) so that the voltage becomes 2.75 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP915 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
• Adjustment method of VREM PWM Duty (H)
(mode number: 766)
1. Select the manual mode of the test mode, and set the mode
number 766. (See page 12)
LCD display
V r h V c h
766
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
key board, and adjust
(voltage down) so that the voltage becomes 2.75 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP914 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
• Adjustment method of VREM PWM Duty (L)
(mode number: 767)
1. Select the manual mode of the test mode, and set the mode
number 767. (See page 12)
LCD display
V r l V c h
767
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
key board, and adjust
(voltage down) so that the voltage becomes 2.5 ± 0.02 V.
Proceed to the next step without pressing X key if voltage is
already adjusted.
MAIN board
TP914 (VC)
TP5105 (GND)
3. Press the X key to write the adjusted value.
– 19 –
[VOL +]
key (voltage up) or
digital
voltmeter
[VOL +]
key (voltage up) or
digital
voltmeter
[VOL +]
key (voltage up) or
digital
voltmeter
[VOL --]
key
[VOL --]
key
[VOL --]
key