PIONEER VSX84TXSI
Manual de Servicio

1

2

3

4

Step 7: 1st DSP
A

k
CN351 (Pin 20) RESET

r
CN351 (Pin 16)

For the following diagnosis, a digital oscilloscope must be used. SPICLK

Is the logic of RST_1 "H" ?

No

Check the output from the DIGITAL MOTHER Assy.

Is the clock signal output while the voltage at SPIDS_1 is "L"?

No

Check the output from the DIGITAL MOTHER Assy.

m

Yes R122

s

Yes R124

B

Is the logic of RST_1 "H" ? Yes Is the logic of RST_1 maintained

No

Check the parts and patterns in the path.

Is the clock signal output while the voltage at SPIDS_1 is "L"?

No

Check the parts and patterns in the path.

at "H"? (Does it fall to become "L" periodically?)

No

It is likely a boot error. (It is very difficult to diagnose which peripheral part of the DSP is in failure.)

t

Yes CN351 (Pin 19) MOSI

n
C

Yes R102 REQ_1

Is the clock signal output while the voltage at SPIDS_1 is "L"?

No

Check the output from the DIGITAL MOTHER Assy.

Does the logic become "H" for a moment when the input stream is changed?

u
No The 1st DSP is in failure. Replace it.

Yes R126

o

Yes CN351 (Pin 21)

Is the clock signal output while the voltage at SPIDS_1 is "L"?

No

Check the parts and patterns in the path.

D

Does the logic become "H" for a moment when the input stream is changed?

v
No Check the parts and patterns in the path.

Yes R125 MISO

p

Yes CN351 (Pin 17) SPIDS_1

Is the clock signal output while the voltage at SPIDS_1 is "L"?

No The 1st DSP is in failure. Replace it.

Does the logic become "L" for a moment when the input stream is changed?

w
No Check the output from the DIGITAL MOTHER Assy.

Yes

CN351 (Pin 18)

q
E

Yes R123

Is the clock signal output while the voltage at SPIDS_1 is "L"? Yes No Check the parts and patterns in the path.

No

Check the parts and patterns in the path.

Does the logic become "L" for a moment when the input stream is changed?

It is very difficult to diagnose which part is in failure.

F

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VSX-74TXVi
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