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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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3.1 Adjusting VCXO (27MHz)
1) 2) 3) 4) 5) Connect the frequency counter to TP1621 located under the card assembly and read the VCXO frequency. On the remote control unit, access Mode C screen on service support program. Press [PAGE+/-] keys for adjusting at 27MHz ± 50Hz. This calibration performs without any reception. [Exit] key: changes value of one step on [PAGE+/-] keys
3.2 Adjusting AGC
1) Tune to an analog channel carrying EIA color bars @ +3 dBmV. 2) Connect the DC voltmeter to TP1045. 3) Adjust VR1066 for maximum reading on the DC voltmeter (approx. +4.0V), then reverse the adjustment to reduce the reading by 2.0V+0.1V/-0.2V 4) Change input level to +15 dBmV. 5) Press INFO to turn the OSD off. 6) Verify the TV picture quality remains the same.
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3.3 Adjusting VCO
1) 2) 3) 4)
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Tune to an analog channel carrying EIA color bars @ +3 dBmV. Connect the DC voltmeter to TP1042. Adjust L1045 for a reading of 4.4V +/- 0.3V on the DC voltmeter. Verify the TV picture quality remains the same.
3.4 Adjusting analog video input level
1) Tune to an analog channel carrying an EIA color bars video signal, 400Hz sine wave at ± 25 kHz audio deviation, and a +5 dBmV visual carrier level. 2) On the remote control unit, press INFO to turn the OSD off. 3) Connect the oscilloscope No.1 to Composite Video output by 75� termination through. 4) Adjust the video input level turning VR1601 by two steps for a reading on the oscilloscope No.1. First step is to turn VR1601 to maximize the output peak-to-peak level just before the wave is clipped. Read that value. Second step is to adjust VR1601 to lower 10 mVp-p than the maximum value measured above. Take care that the output level should be over 900 mVp-p at that time.
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This adjustment should be performed after finishing �3.2 Adjusting AGC� and �3.3 Adjusting VCO� .
The above mentioned adjustment value must be obtained in a case where the sync level is 40 IRE and the luminance level is 100 IRE when the signal is envelope-detected by a standard detector and measured by a video signal analyzer. Adjust the degree of modulation on the modulator so that the luminance level of the signal source for adjustment becomes 100 IRE ± 0.2 IRE. In this case, the ideal sync level is 40 IRE.
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