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perfect copy, im very satisfied, i was need the diagram over the powersupply and
the copy was very sharp
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This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
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IF PRINTED CIRQUIT BOARD WIRING VIEW WAS ONE TONE LIGHTER, THEN 5 STAR RANK HAS TO BE MY CHOISE.
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Very usefull, good quality drawings !
Muito útil encontrei todas as informações necessárias.
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Wanting to repair a neighbours tape recorder I needed the necessary information, it makes it easier. Although the service manual is described as "Language : English" To my dismay I found that it is entirely written in German, a language I do not understand. At least I now have the schematics which will help of sorts. I may not use this service again due to the laguage difficulty after all when it states English you do not expect it to be entirely in another language.
Adjustment
3-5-3. How to Adjust (1) Adjusting initial voltage wave form Check the voltage wave form like the mentioned way on the 3-4-3(How to adjust) and readjust the wave form when it is wrong. (2) Checking the DC/DC pack voltage - Convert the signal of signal generator to the 100% Full White signal - Connect the GND terminal of DVM to the GND of Y B/D and set the Plus terminal to the right up leg of R9 to check the -Ve voltage (-35 1V). And when there is abnormality in voltage turn the variable resistor (VR7) of DC/DC Pack(-Ve) on Y B/D to adjust. - Connect the GND terminal of DVM to the R60 s right leg of the Y B/D and set the Plus terminal to the left leg of R60 to check the Vscw voltage(115 1V) and when there is abnormality in voltage turn the variable resistor(VR5) of DC/DC Pack(Vscw) on Y B/D to adjust. - Connect the GND terminal of DVM to the R8 s right leg of the Y B/D and set the Plus terminal to the left leg of R8 to check the -Vy voltage(-80 1V) and when there is abnormality in voltage turn the variable resistor(VR6) of DC/DC Pack(-Vy) on Y B/D to adjust. - Connect the GND terminal of DVM to the R89 s right leg of the Y B/D and set the Plus terminal to the left leg of R89 to check the Vsetup voltage(240 1V) and when there is abnormality in voltage turn the variable resistor(VR4) of DC/DC Pack(Vsetup) on Y B/D to adjust. (3) Measuring the Vs voltage Margin and deciding the voltage - Convert the signal of signal generator to the 100% Full Red signal. - Turn the voltage adjusting knob of Vs DC power supply to the voltage -down direction and make the cell of screen turned off. - Turn the voltage adjusting knob of Vs DC power supply to the voltage -up direction until the cell of screen turned on. The first voltage, which make the cell of full screen turned on, is named as Vsmin1 and record it. - Turn the voltage adjusting knob of Vs DC power supply to the voltage-up direction slowly until the cell of screen turned off or over electric discharge. The first voltage, which makes the cell of screen turned off or over electric discharge, is named as Vsmax1 and records it. (Only, Vs voltage variable passes over the maximum 195V) - Convert the signal of signal generator to the 100% Full Green signal. - Repeat the adjustment (2) item and name each voltage as Vsmin2/Vsmax2 and record them. - Convert the signal of signal generator to 100% Full Blue signal. - Repeat the adjustment (2) item and name each voltage as Vsmin3/Vsmax3 and record them. - Convert the signal of signal generator to 100% Full White signal. - Repeat the adjustment (2) item and name each voltage as Vsmin4/Vsmax4 and record them. - Convert the signal of signal generator to 100% Full Black signal. - Repeat the adjustment (2) item and name each voltage as Vsmin5/Vsmax5 and record them. - At this time decided Vs voltage (Vsmin1-Vsmin5) adds 6V to Max value and set up the voltage within the set-up range(180V < Vs 195V) in consideration of other features. - Turn the voltage adjusting knob of Vs DC power supply make deciding the Vs voltage. - Adjust Vset down wave form using setting up Vs voltage like mentioned on the 3-4-3. (4) Adjusting the final voltage wave form Check the voltage wave form like the mentioned way on the 3-4-3(How to adjust) and readjust the wave form when it is twisted.
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