Problem with Technics RS-616

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hello, i found a Technics RS-616 cassette deck but it has a problem. On the right channel there is a high pitched tone. It is present at the output of the RCA plugs and i can see it on the vu meter. Even when there is no tape in there its still present. Does anyone have a idea at what may cause this? Mb someone has a schematic of this unit? Thanks in advance.

-Andrei
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.