HEATHKIT 10MHz Oscilloscope overheating problem.
Matt
I have two Heathkit 10MHz scopes and they both have failed at the same
spot. So I am wondering if anyone else has had this problem.
The problem is on the left vertical board and its down on the lower left
side of the board (when you look at the component side of the board). The
10 Ohm resistor gets really hot, and eventually burns up. The display is
majorly out of wack (for lack of a better term). Most controls have no
effect, but it is displaying something.
The model number for the scopes is: IO-4550.
Thanks to anyone that is willing to help me out. If you need more info
I have it. Thanks
- Matt Rizzo
Oakland University
School of Engineering and Computer Science (SECS)
JackH35785
On my 4530 the only 10 ohm resistor(s) are R145 and R146. R145 is connected to
the collector of Q38 and goes to the emitter of q41. R146 is connected to the
collector of Q 39 and goes to the emitter of the emitter of Q42. 145/Q41 goes
to the "X1" control. 146/Q42 goes to the "X2" control. They are all part of the
"Horizontal" circuit.
Does this look familiar?
Jack
Asimov
HEATHKIT 10MHz Oscilloscope overheating problem. (29 May 00 14:40:22)
One thing about Heathkit is that their paper caps "sucked" big time.
Just change the damn sorry things in the interstage coupling for nice
polycarbonate ones and see if anything improves...
"M> I have two Heathkit 10MHz scopes and they both have failed at the
"M> same spot. So I am wondering if anyone else has had this problem.
"M> The problem is on the left vertical board and its down on the
"M> lower left side of the board (when you look at the component side of
"M> the board). The 10 Ohm resistor gets really hot, and eventually burns
"M> up. The display is majorly out of wack (for lack of a better term).
"M> Most controls have no effect, but it is displaying something.
"M> The model number for the scopes is: IO-4550.
"M> Thanks to anyone that is willing to help me out. If you need more
"M> info I have it. Thanks
"M> - Matt Rizzo
"M> Oakland University
"M> School of Engineering and Computer Science (SECS)
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pshov...@my-deja.com
power to this circuit board is supplied thru this resistor. In my case
one of the bright blue tantalum capacitors was shorted. There are about
6 of them to check.
Paul Shovestul
In article <qQyY4.93426$h01.6...@news1.rdc1.mi.home.com>,
"Matt" <mriz...@home.com> wrote:
> Hello,
>
> I have two Heathkit 10MHz scopes and they both have failed at the
same
> spot. So I am wondering if anyone else has had this problem.
>
> The problem is on the left vertical board and its down on the
lower left
> side of the board (when you look at the component side of the
board). The
> 10 Ohm resistor gets really hot, and eventually burns up. The
display is
> majorly out of wack (for lack of a better term). Most controls have
no
> effect, but it is displaying something.
>
> The model number for the scopes is: IO-4550.
>
> Thanks to anyone that is willing to help me out. If you need
more info
> I have it. Thanks
>
> - Matt Rizzo
> Oakland University
> School of Engineering and Computer Science (SECS)
>
>
Sent via Deja.com http://www.deja.com/
Before you buy.
dmari...@gmail.com
dmari...@gmail.com
I have the same scope, I put it a way working years ago and just turned it on today and it smoked. There is a burnt 10uf cap and 10ohm resistor on the vertical board in the minus 15 volt circuit. I believe the burnt components on my scope are C123 and R163-1, the cap is shorted. I will eventually try to replace the resistor and cap.
D. marino
bitrex
olds...@tubes.com
<bit...@de.lete.earthlink.net> wrote:
>shorted. I will eventually try to replace the resistor and cap.
>>
>> D. marino
>>
>
>You're responding to a post made over 17 years ago.
17 years ago, they hadn't even invented the electron yet!