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The content of the manual was not found on the Internet and was a hard find. I check the net for 5 hours until I came across this web-site. When I did find the book it Auto loaded into my IPAD PDF shelf for books for review at anytime. Overall I am satisfied with the book and it answered all my questions. This repair book is obsolete because the product I bout it for is pretty old. Thanks for the help with the download and even having the manual. Thanks 73's K5HRD
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Easy and secure way to get a complete service manual of a vintage hifi component. Only some parts of the print copy are dificult to read. Nice price!
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Step 7: 1st DSP f
CN401 (Pin 20) RESET
j
CN401 (Pin 16)
For the following diagnosis, a digital oscilloscope must be used. SPICLK
A
Is the logic of RST_1 "H" ?
No
Check the output from the DIGITAL MOTHER Assy.
w
Yes R139
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the output from the DIGITAL MOTHER Assy.
y
Yes R144
Is the logic of RST_1 "H" ? Yes
No
Check the resistors and patterns in the path.
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the resistors and patterns in the path.
B
Is the logic of RST_1 maintained at "H"? (Does it fall to become "L" periodically?)
k
No It is likely a boot error. (It is very difficult to diagnose which peripheral part of the DSP is in failure.)
Yes CN401 (Pin 19) MOSI
g
Yes R134 REQ_1
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the output from the DIGITAL MOTHER Assy.
C
z
Does the logic become "H" for a moment when the input stream is changed? No The 1st DSP is in failure. Replace it.
Yes R146
g
Yes CN401 (Pin 21)
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the resistors and patterns in the path.
AA
Does the logic become "H" for a moment when the input stream is changed? No Check the resistors and patterns in the path.
Yes R142 MISO
h
Yes CN401 (Pin 17) SPIDS_1
Is the clock signal output while the voltage at SPIDS_1 is "L"?
D
No The 1st DSP is in failure. Replace it.
i
Does the logic become "L" for a moment when the input stream is changed? No Check the output from the DIGITAL MOTHER Assy.
Yes CN401 (Pin 18)
x
Yes R137
Is the clock signal output while the voltage at SPIDS_1 is "L"? Yes
No
Check the resistors and patterns in the path.
E
Does the logic become "L" for a moment when the input stream is changed? Yes
No
Check the resistors and patterns in the path.
It is very difficult to diagnose which part is in failure.
F
VSX-LX70
5 6 7 8
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