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hitachi 8290 fast high pitch pulsing


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#1 geoffhartwell

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Posted 16 April 2017 - 02:55 PM

i have an hitachi 8290 , but its got a real fast high pitch pulsing noise, ive had it apart and ive done all the usual cleaning of switches and record play backs, all in input  ports , but if i unplug the deck heads it stops, if i pug the head back in and cross left or right positive with any neg it stops but that only knocks a channel out, any ideas, thanks Geoff



#2 hopey

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Posted 17 April 2017 - 06:09 AM

Hard to tell what you mean. I think your saying it's an audioble noise and not mechanical?

The first thing I would check is your pinch roller because if it's slipping the take up spool clutch may be cutting in and out which will affect the sound.

#3 geoffhartwell

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Posted 17 April 2017 - 10:57 AM

it dose it on radio to, but not as loud, its def  not the pinch roller, its a real hi pitch beep beep beep real fast to



#4 hopey

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Posted 18 April 2017 - 02:06 AM

Sounds like a noisey capacitor in the power supply. Have you trying using battery or DC supply?

#5 baddboybill

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Posted 18 April 2017 - 10:36 AM

I would check the connections on head and also check for pinched insulated head wire

#6 geoffhartwell

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Posted 18 April 2017 - 02:43 PM

still doing it on dc , head connection is good , even changed the head, it also recorded the high pitch beeping onto a tape , with out pressing record, could it be a bad record playback switch



#7 baddboybill

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Posted 18 April 2017 - 08:42 PM

Possibly a bad insulated wire to head or maybe a bad ground on deck too