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again you did a very good job. It was fast too. Photocopy are really readable and clear
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Probably it never existed a 1081 official service manual from Commodore, it's look more like a NAPCEC service manual & diagrams compilation of the 1084 series and his variants, like the nap6523, 8cm505, 1084S, 1084P and obviously the 1081. It's more complete than other scans and the quality of the scans also are far superior. It has two circuit diagrams variants of the 1081, mono and stereo versions. It doesn't include a diagram for the Philips CM8500 or CM8501, they look like the 1081 but they are slightly different.
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Rapid, clear well done as all the scheme I downloaded from this site. Great job very functional and very useful
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Great copy of the manual, has all information required for servicing,
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I work at an authorized service center and I can tell if a manual is as it should be. This one is. It may be a scan, but a very good one at that. The interesting part for me was the curcuit diagram which was scanned at high quality, making it as good as the original. I will definitely be back as a customer. I need not say this, but I will: the price was the best. Thank you owner-manuals.com .
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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
198
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VSX-74TXVi
3 4
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