Protek 506 DMM service manual or Circuit Schematic request

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protek 506

I need Protek 506 DMM circuit schematic especialy RS232 section.

thanks.
 

protek 506 schematic

Did you find the service manual for 506?? My 506 doesn´t work!!!
 

protek 506 manual

Thanks deep_intruder my DMM is a Protek 504, with this diagram converted my DMM to 506.
Thanks
 

Hi

I have a little problem. When I measure with my Protek 506 I did mistake and my Protek is probably dead ( . I can measure all quantity normally except for voltages. When I switch to voltage ~ or = numbers run random and it does not work. Also when I turn on multimeter and I have set it to ~ or = V numbers still run. When I did mistake I have switched multimeter to ~V and a switched it to =V. Could you help me anyone?

Thanks for any help
 

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