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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 .
Model 185B (3) The voltage across staircase capacitor C236 increases, and is applied, through SCANNING switch S203C/D, to unity amplifier V201AQ210, increasing output of the generator by the same amount; this output is the horizontalscan voltage. (4) After comparator blocking oscillator pulse decays, diode CR215 becomes reverse-biased again, and prevents charge on capacitor C236 from leaking off. (5) DENSITY contrbl R255B is in the charge path of staircase capacitor C236. DENSITY permits limited adjustment of charge-path resistance, thereby determining amplitude of staircase steps by controlling amount of charge added to staircase capacitor each time blocking oscillator fires. (6) The output of unity amplifier V201A-Q210 is applied to transformer T203 in such a way that a bootstrap action results. Thus for a given density, the same amount of charge is added to staircase capacitor C236 each time, which results in staircase steps of equal amplitude.
Section IV Paragraph 4-84 (7) When voltage across staircase capacitor C236 reaches about +15 volts, reset blocking oscillator Q209-T204 fires and discharges the capacitor. The staircase is thus reset and starts over again. 4-84. RESET BLOCKING OSCILLATOR. When the staircase voltage exceeds voltage on collector of Q209 (approximately 15 volts), diode CR217 becomes forward-biased, current begins to flow through collector winding of transformer T204, and capacitor C236 effectively becomes the voltage supply for blocking oscillator Q208-T204. The effect of this current flow is transformer-coupled to the base of Q209, which causes blocking oscillator to fire, essentially dropping collector of Q209 to ground. The resulting current-flow through CR217 and QZOQdischarges capacitor (2236, thereby resetting the staircase. It might be pointed out here that the amplitude of the staircase signal remains constant. The height of each individual step can be varied by adjusting R255B a s mentioned in paragraph 4-83, step d (5). The result of varying the height of each step is to change the number of steps per staircase, which changes the number of samples per sweep on the crt.
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RESET BLOCKING OSClLL ATOR
1 -FEEDBACK
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i TIMETEASE I OU WT
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I
R267
300
R272
HORIZONTAL SIGNAL
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TO COMPARATOR AND HORIZONTAL AMPL.
Figure 4-10. Staircase Generator 01255-1 4-11
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