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Old 7th Aug 2023, 4:16 pm   #1
Christian79
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Default Panasonic AG-MD830 blinking "d" in Display

Hello,

I have a Panasonic AG-MD830 that shows a flashing d in the display. I recently bought this unit and have never used it myself. According to the service manual, it is the indication that there is dew in the unit. Since the unit has been in a room with a constant 22 degrees Celsius for almost a week before it was switched on for the first time, I do not assume that the dew is real.

Does anyone have any experience with this?

Many greetings from Berlin Germany
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Old 7th Aug 2023, 5:48 pm   #2
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Default Re: Panasonic AG-MD830 blinking "d" in Display

Very little experience with commercial VCR`s personally, but if you can locate the dew sensor, I would try blowing some hot air on it from a hair dryer, this was the method used on domestic equipment years ago.
Ken G6HZG.
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Old 7th Aug 2023, 8:41 pm   #3
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Default Re: Panasonic AG-MD830 blinking "d" in Display

Ripple on the psu secondaries can cause unusual faults.
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Old 8th Aug 2023, 7:14 am   #4
Christian79
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Default Re: Panasonic AG-MD830 blinking "d" in Display

Quote:
Originally Posted by its ur aerial View Post
Very little experience with commercial VCR`s personally, but if you can locate the dew sensor, I would try blowing some hot air on it from a hair dryer, this was the method used on domestic equipment years ago.
Ken G6HZG.
Hi and thank you for your message. I already had the same thought and have also tried this, unfortunately without success. I am also not sure where exactly this sensor should be located. According to my research, it should be on the main board, but I have not been able to identify it.
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Old 8th Aug 2023, 12:43 pm   #5
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Default Re: Panasonic AG-MD830 blinking "d" in Display

On Pro Panasonic machines the dew sensor was usually attached to the head drum assembly just below the tape path. Look for a couple of thin normally white wires going to a small patch.
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Old 8th Aug 2023, 6:47 pm   #6
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Default Re: Panasonic AG-MD830 blinking "d" in Display

In early (consumer) machines it was sometimes off to the side of the tape path. A ceramic or similar patch with two wires soldered on to it.

I don't think it was ever mounted on the mainboard as that didn't have enough thermal mass.
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Old 8th Aug 2023, 7:26 pm   #7
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Default Re: Panasonic AG-MD830 blinking "d" in Display

They often looked quite similar to this:-
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Old 8th Aug 2023, 7:47 pm   #8
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Default Re: Panasonic AG-MD830 blinking "d" in Display

oddly enough if you suspect the dew sensor you can short it out to prove the point, counterintuitively when dry they are a much lower resistance, one would think they would read lower when damp!
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Old 8th Aug 2023, 8:27 pm   #9
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Default Re: Panasonic AG-MD830 blinking "d" in Display

Check/change all power supply secondary caps.
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