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Incredibly clear!!!! Well done, complete and wonderful. It could not better than this!!!!
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Thank You for fast delivery for the sheme.
Everything allright.
Thanks & best regards Franz
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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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A
A
Turn the main power on with the cable to the CN2401 or CN2301 disconnected. Check if 5 V DC is output from Pin 8 of CN2301. YES NO Failure in the CN2301 or LED PWB (failure in the M5V line at Pin 8 of the CN2401)
Turn the main power on with the cable to the CN2302 or CN9010 disconnected. Check if 5 V DC is output from Pin 20 of CN9010. YES NO Is 5 V DC output from Pin 5 of IC9502? NO Failure in the MAIN PWB (failure in the IC9502) Failure in the CN2302 or COMM SLOT IF PWB (failure in the M5V line at Pin 20 of the CN2302)
B
YES Turn the main power on with the COMM SLOT Assy disconnected from CN2303. Check if 3.3 V DC is output from Pin 118 of CN2303.
C
YES NO
Failure in the COMM SLOT Assy (failure in the M3.3V line at Pin 118 of the CN2303)
Turn the main power on with the cable to the CN2302 or CN9010 disconnected. Check if 3.3 V DC is output from Pin 16 of CN9010. YES NO Turn the main power on with the cable to the CN4004 or CN5301 disconnected. Check if 3.3 V DC is output from Pin 50 of CN5301. YES NO Failure in the CN4004 or COMM SLOT IF PWB (failure in the M3.3V line at Pin 1 of the CN4004) Failure in the CN2302 or COMM SLOT IF PWB (failure in the M3.3V line at Pin 16 of the CN2302)
D
Turn the main power on with the cable to the CN2201 or CN9011 disconnected. Check if 3.3 V DC is output from Pin 1 of CN9011. YES NO Is 3.3 V DC output from Pin 4 of IC9503? YES Is 0 V DC output from Pin 14 of CN8502 (AD2)? NO (4.7V) Failure in the AD2 connector or MAIN PWB (failure in IC9501 or X9501) Note: If IC9501 is in failure, replace the whole board. NO Failure in the MAIN PWB (failure in the IC9503)
E
Failure in the CN2201 or KEY PWB (failure in the M3.3V line at Pin 1 of the CN9011)
YES Failure in the MAIN PWB (failure in IC9501 or X9501) Note: If IC9501 is in failure, replace the whole board.
F
PDP-425CMX
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