Pioneer MEP-7000 Service Manual page 219

5
104
Start of 5-V power (to the SIDE PANEL microcomputer, etc.), which requires accuracy in voltage
As there is a possibility that the voltage of V+SW5D will drop to around 4.2 V during bus-powered operation,
5 V is guaranteed where it is necessary.
Signal Name
No.(SCH/PCB)
CH1 V+8D 109
CH2 V+BUS5D 101
CH3 V+SW5D 108
CH4 V+5D 110
Time
200ms/div
a-b: 390ms
Voltage
CH1 5.0V/div
CH2 5.0V/div
CH3 5.0V/div
CH4
5.0V/div
Measurement conditions
Normal style: At the time of power on
105
LCD backlight control
V+LCDVF is set to ON, triggered by DISP ON.
If the backlight brightness setting is changed in Utility mode,
the LUMICON waveform and V+LCDVF current are changed.
Signal Name
No.(SCH/PCB)
CH1 V+BUS5D 101
CH2 DISP_ON 143
CH3 LUMICON 112
CH4 V+LCDVF 113
Time
500ms/div
a-b: 1.3s
Voltage
CH1
5.0V/div
CH2 2.0V/div
CH3
2.0V/div
CH4
20.0V/div
Measurement conditions
At the time of power on
106
5
6
Measurement Point
TP
C600
CH1
Q811(1)
V+8D
TP
CH2
V+BUS5D
CH3
V+SW5D
CH4
V+5D
Measurement Point
C600
R701
R705
CH1
TP
V+BUS5D
CH2
DISP_ON
CH3
LUMICON
CH4
V+LCDVF
CH1
V+BUS5D
CH2
DISP_ON
CH3
LUMICON
CH4
V+LCDVF
MEP-7000
6
7
a b
Brightness: 1
a b
Power on LCD: Lit
Brightness: 2
a b
Power on LCD: Lit
7
8
A
B
C
D
E
F
219
8