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Electronics => Repair => Topic started by: CGMtesting on May 07, 2020, 07:16:51 am

Title: Datron 4805 multifunction Calibrator - No DC output voltage.
Post by: CGMtesting on May 07, 2020, 07:16:51 am

Dear All,

I am new to this forum and thanks for accepting me.

I have an issue on my Datron 4805. My problem is that for some reason, I have no DC voltage as output....The output is always 0Vdc.

Does anyone have any idea where to check because I have no schematics to start.

Thanks.

Title: Re: Datron 4805 multifunction Calibrator - No DC output voltage.
Post by: Grandchuck on May 07, 2020, 05:49:33 pm

Here is a link for manuals for two similar models:

https://www.eevblog.com/forum/testgear/service-manuals-for-datronwavetek-4808-multifunction-calibrator/ (https://www.eevblog.com/forum/testgear/service-manuals-for-datronwavetek-4808-multifunction-calibrator/)

Title: Re: Datron 4805 multifunction Calibrator - No DC output voltage.
Post by: CGMtesting on May 08, 2020, 05:44:19 am

Hi Grandchuck,

Thanks a lot for helping me.

I found the fault .....found 2 dry joints on Q6 (JE340) and Q7(JE350) of the Vdc card (with orange circuit board ejectors).  On the collector I had to find +38Vdc and -38Vdc respectively.

Thank you.

Title: Re: Datron 4805 multifunction Calibrator - No DC output voltage.
Post by: Grandchuck on May 08, 2020, 02:06:11 pm

Nice work!  You are welcome.