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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
XV-S500BK/XV-S502SL
Check points for each error
(1) Spindle start error 1.Defective spindle motor *Are there several ohms resistance between each pin of CN201 "5-6","6-7","5-7"? (The power supply is turned off and measured.) *Is the sign wave of about 100mVp-p in the voltage had from each terminal? [ CN201"9"(H1-),"10"(H1+),"11"(H2-),"12"(H2+),"13"(H3-),"14"(H3+) ] 2.Defective spindle motor driver (IC251) *Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(SM1~3) of CN201"5,6,7" and IC251"2,4,7"? *Is FG pulse output from the terminal of IC251"24"(FG) according to the rotation of the motor? *Is it "L(about 0.9V)" while terminal of IC251"15"(VH) is rotating the motor? 3.Has the control signal come from servo IC or the microcomputer? *Is it "L" while the terminal of IC251"18"(SBRK) is operating? Is it "H" while the terminal of IC251"23"(/SPMUTE) is operating? *Is the control signal input to the terminal of IC251"22"(EC)? (changes from VHALF voltage while the motor is working.) *Is the VHALF voltage input to the terminal of IC251"21"(ECR)? 4.Is the FG signal input to the servo IC? *Is FG pulse input to the terminal of IC301"69"(FG) according to the rotation of the motor?
(2) Disc Detection, Distinction error (no disc, no RFENV) * Laser is defective. * Front End Processor is defective (IC101). * APC circuit is defective. --- Q101,Q102. * Pattern is defective. --- Lines for CN101 - All patterns which relate to pick-up and patterns between IC101 * IC101 --- For signal from IC101 to IC301, is signal output from IC101 "20" (ASOUT) and IC101 "41"(RFENV) and IC101 "22" (FEOUT)?
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