Author Topic: Hameg 203-7 problems  (Read 1116 times)

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Offline ThorCW

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Hameg 203-7 problems
« on: September 15, 2016, 06:41:27 pm »
I recently received hameg 203-7 scope and the traces do not show up. Ive checked the power supply and the rails everything seems ok. I did check the lower voltages on the back of the crt I found the vr206 pot was way out of adjustment. Put that back in spec now if the scope is left on for 10 minutes if you cycle the power a trace appears then go right away. The other voltages seems a few volts low but still in spec. Any ideas?
 

Offline ThorCW

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Re: Hameg 203-7 problems
« Reply #1 on: September 19, 2016, 05:24:52 pm »
New revelation in the Hameg scope. I acquired a high voltage probe and measured the high voltage and after the second measurement the traces were there and have not went inop since. I have also unplugged from power and let it sit and the traces come right back. So anyone happen to know the science of this?
 

Offline silverlego3

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Re: Hameg 203-7 problems
« Reply #2 on: September 19, 2016, 06:58:49 pm »
Here is the service manual for that scope,not sure if you had it when you checked the voltage rails.  :-+
http://data2.manualslib.com/pdf3/57/5634/563302-hameg/hm_203.pdf?056286f123711c821f7e37942a5e52a3
"Work Smarter, not harder"

"Its hard to soar like a eagle when your flying with turkeys"
 
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Offline ThorCW

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Re: Hameg 203-7 problems
« Reply #3 on: September 20, 2016, 01:07:25 am »
I did have that. The voltages were all within spec but when I touched the lead to pin 3 on the crt board it lit right up and has worked ever since.
 

Offline tronde

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Re: Hameg 203-7 problems
« Reply #4 on: September 20, 2016, 09:08:58 pm »
You will most likely find some weak solder joints on the CRT socket, or that the contacts in the socket have lost some spring tension.
 
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