Pioneer AVIC-X3/XU/EW5 Service Manual page 52

1
Check 2: Is VDD5 (VCC33, VCC12) power supply voltage OK?
A
VDD5
VDD5
B
<Check> Check the voltage at the "VDD5_3, VCC33_3 and VCC12_1" test point while the power is on.
Use the "DGND1" test point at the reference.
NO. Check point
1 VDD5_3 - DGND1
2 VCC33_3 - DGND1
3 VCC12_1 - DGND1
C
Side A
D
E
Fig 2.2: VDD5, VCC33, VCC12 voltage check points
F
52
1
2
F.E. driver control system
IC1001 DC/DC
converter
VCC 3.3 V/1.2 V output
Fig 2.1: Power supply configuration
Module No.
ALL
ALL
ALL
2
3
IC1401 FLASH power supply (Data)
IC1402 FLASH power supply (Program)
IC1481 SDRAM power supply
VCC33 (= 3.3 V )
IC1501 DVD-LSI power supply
IC1501 DVD-LSI power supply
VCC12 (= 1.2 V )
Specification value
Unit
5.0 ± 0.4 V
3.3 ± 0.15 V
1.2 ± 0.12 V
AVIC-N4/XU/UC
3
4
VDD5_3
VCC33_3
DGND1
VCC12_1
4