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Awesome manual. Complete diagrams of all board assemblies as well as how to get to each part of the t.v. down to the individual screws and their locations. Get it.
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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.
GA-200 SERVICE NOTES
Figure 24 (lower part of diagram) shows the parabolic voltage at line frequency on terminals of C617 (do not confuse with E/W modulation which operates at 100Hz) which, as can be seen in figure 25, is modulated at vertical frequency, due to the modulation brought about by the E/W. The parabolic form of the signal (31 KHz) allows for controlling the gate of transistor Q612, so that when the signal reaches the highest point, it saturates Q609, which cuts out Q612. Control of the gate is achieved by means of Q609 and the
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divider formed by R631 and R630. Figure 25 shows the same signals in vertical frequency, where the attack on the gate of Q612 can be observed.
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Figure 24
Figure 25
In this circuit, a safeguard (Q614) has been incorporated to protect against overvoltage peaks in the Source of Q612 when turning the television set on.
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