PIONEER VSX80
Manual de Servicio

5

6

7

8

A

USB Troubleshooting
Step 1: Connectors
CN701, CN702 Are the connectors securely inserted ? Yes To STEP 2 The output and GND may be short-circuited. Check the path between them.

6

IC703 (pin 1), IC702 (pin 7)

3.3 V Reg. output / 1.8 V Reg. input Is IC703 abnormally hot? Yes No

No Insert the connectors securely.

Is the voltage 3.3 V ? Yes

No

Replace IC703.

B

Step 2: Power supply
1
CN702 (pin 4) 5 V input Is there any loose connection of CN702? Yes

7

IC762 (pins 37, 47) FLASH ROM

Is the voltage 5V? Yes

No

No

Is the voltage 3.3 V ? Yes

No

Check the parts and patterns in the path.

Check the MOTHER Assy.

8

C

IC761 (pins 1,3,9,14,27,43,49) SDRAM

To STEP 1

2

IC703 (pin 3)

3.3 V Regulator IC input

Is the voltage 3.3 V ? Yes

No

Check the parts and patterns in the path.

Is the voltage 5V? Yes

No

Check the patterns in the path.

9

IC953 (pin 14) Is the voltage 3.3 V ? Yes

5-3 Converter

No

Check the parts and patterns in the path.

D

3

IC951 (pin 14)

3-5 Converter

Is the voltage 5V? Yes

No

Check the parts and patterns in the path.

10 IC701 (pins 16,33,64,76,112) USB Media control IC
Is the voltage 3.3 V ? Yes

No

Check the parts and patterns in the path.

4

IC771 (pin 5)

USB Power SW

Is the voltage 5V? Yes

No

Check the parts and patterns in the path.

E

11

IC702 (pin 1)

1.8 V Regulator output

5 IC7814 (pins 14, 15) DAC
Is the voltage 5V? Yes No Check the parts and patterns in the path.

Is the voltage 1.8 V ? Yes

No

Is IC702 abnormally hot? Yes

No

Replace IC702.

The output and GND may be short-circuited. Check the path between them.
F

A
VSX-1016V-K
5 6 7 8

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