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Hi, I can give you this link. You can download the service manual of this Onkyo. I hope it will be usable for you. When you get to the site using the link it is possible that you have to wait a little bit to be able to download. After waiting you should see a button as "Get Manual" and simply click on it and save the file. Thanks. gylacz
clean the head with alcohol.if the head surface is not smooth,it could be worn
.there is a small screw on the side of the head for changing the azimuth.
most front load tape decks have a small hole in the front of the door, when the outer part of the door is taken off.
the best way to align the heads with with a 10khz alignment tape and an oscilloscope.
the screw is adjusted for maximum high frequency performance.
a qualified shop should be able to do a complete service and align for around 50 dollars
With the deck in play mode put your finger on the imput of the channel that is low. If it buzzers the same as the other then you may have a faulty head. If it does not there is something wrong in the amp stages of the deck. You can also reverse the leads from the head and if the sound goes down on the other channel it is the head. Try doing it where the leads join with the PC Board, it will be less messing than at the head itself.
the screws are sometimes locked with Loctite or similer and the screw slot may be blocked up also. wetting the screw head with acetone will help to allow for the blocked screw head to soften. BE CAREFUL WITH ACETONE. it will damage plastic!!