Pioneer AVH-P5050DVD Service Manual page 38

1
Check 2: Is VDD5 (VCC33, VCC12) power supply voltage OK?
A
VDD5
F.E. driver control system
IC1007
VDD5
3.3 V output regulator
IC1008
DC/DC converter
1.2 V output
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
Side A
C
D
E
Fig 2.2: VDD5, VCC33, VCC12 voltage check points
F
38
1
2
Fig 2.1: Power supply configuration
Module No.
ALL
ALL
ALL
AVH-P5050DVD/XN/RC
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
VDD5_3
DGND1
3
VCC33
VCC12_1
4
4