[TechAssist] Re: Noisey coils & Transformers
- From: jmgoins.tn@xxxxxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 29 Nov 2001 04:00:36 -0500
A few years back I worked for an outfit that had contracted to service
quite a few Wyse terminals. This was long before I had ever heard of an ESR
meter. In a Wyse 60 terminal the power supply free runs at an audible
frequency, at startup, and
syncs to the horizontal sync (ultrasonic frequence). A cap dried out which
supplied the signals for the PS to sync to, and the PS stayed at an audible
frequence. Male techs (myself included) could hear this but barely, but it
annoyed some secretaries immensely.
Mike Goins jmgoins.tn@xxxxxxxxxxx
At 02:18 AM 11/29/01 -0600, you wrote:
>
>
>you have to get married,,then your wife can hear them for you
>
>Dennis Viereck wrote:
>
>> Since we ran the "cleaning the video head" into the ground I have another
>> question for the group.
>>
>> I would like to know how all of you check for coils, transformers, and
other
>> components that sometime have the tendency to squeal at high audible
frequencies
>> in televisions? The devices I mean are like flybacks, linearity coils,
yokes
>> and brackets for these devices.
>>
>> Once you find, how do you correct them? By replacement or other tricks?
>>
>> For those of you, like me, who's hearing rolls off at 7 khz and can't
hear these
>> noises, how do you detect them, and how do you know you have it repaired
if you
>> can't hear these high frequencies?
>>
>> Dennis Viereck
>>
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