I have an old optimus karaoke player (C.D & dual cassette, model 32-1163, bought " 2nd hand".It was in disuse for a few years.After bringing it home, and cleaning it externally, I switched it on and it started working, but with a "motor-boat" sound. After some time, I switched it off and after a few hours, when I put it on, it refused to work.! The tape revolves ok.But nothing else! Could you please advise.I wish to get a copy of its circuit diagram & service manual.Thanking You, P.C.Cheryan.(INDIA)

SOURCE: Circuit Diagram of Yamaha RX-V490 requied.

I have the schematics in PDF file, but how can I send it to you?

SOURCE: Problem on Yamaha RX -V 800

check to see if there are any speaker wires that are touching each other near the connections. i had this happen on an onkyo receiver and found it was a purposeful feature intended to keep you from shorting out the receiver. if the + and - speaker wires touch (at the receiver posts or the speaker posts) this can happen.

SOURCE: for some time no sound on speakers

check digital controll board

SOURCE: Cassette deck not working

Hi, with the lid off operate the unit and see if drive still gets from the motor to capstan flywheel. Sometimes even although belts look ok, the have a buildup on the drive surfaces that will prevent it from applying enough tractive effort to the flywheel to engage the rolling mechanism. most of the hard work in ooperating the transport occurs when you select a function as the transport engages cam gears and followers to provide mechanical movement to engage the operation you have selected. You can fix this by cleaning the belt by running it across a cotton bud dipped in solvent (i use acetone, or iso alchohol),but replacing the belt is generally a longer term solution. If you need more advice then hitme back... happy to help

SOURCE: My TEAC A550RX stereo cassette

If the unit ends up in the middle of a cycle, the front panel will appear to be unusable. With a unit that has been idle for a long time, the belts and motors may be a little sluggish. This unit needs a general overhaul and the belts replaced. This should not be a major expense. Figure about $10 in belts and your ocal labor charge for the repair. If I remember correctly, this unit uses both a flat and square belt.
Dan