PIONEER vsx-916
Service Manual

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7.3.4.3 Troubleshooting Step 1: Connectors
A

CN701, CN702 Are the connectors securely inserted ? Yes

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.

To STEP 2 The output and GND may be short-circuited. Check the path between them.

Step 2: Power supply
B

7

IC762 (pins 37, 47) FLASH ROM

1

CN702 (pin 4) Is the voltage 5V? Yes

5 V input Is there any loose connection of CN702? Yes Is the voltage 3.3 V ? Yes Check the MOTHER Assy. No Check the parts and patterns in the path.

No

No

8

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

To STEP 1

2
C

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.

3

IC951 (pin 14)

3-5 Converter

D

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
E

No

Check the parts and patterns in the path.

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.

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F

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VSX-816-K
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