JVC HR-S3912U S-VHS VCR Logo
Rick Lentz Posted on Jul 03, 2007
Answered by a Fixya Expert

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VCR stuck in auto time set mode

While watching TV the other day, my HR-S3901 display went to "AUT" and the signal was lost at the TV. When it does this, the unit locks up and no front panel or remote buttons have any effect. Having a VCR years ago that locked up, I unplugged it and re-plugged it in and the unit came back on. After about 30 minutes it did the same thing. However it is now stuck in this mode. Whenever the unit is plugged in, it blinks a channel 2 very quickly, then it goes into the AUT mode. Sometimes after about 10 minutes, the -:-- shows on the display. But in no case do any of the buttons do anything nor can I get any picture out of it. I tried the holding of the power button for 10 seconds trick with no success. Any ideas?

  • Rick Lentz Jul 11, 2007

    Thank you for your suggestions. Like most people, I looked for the simple cure. I have pretty much gone with the last suggestion that refers to the new VCRs as disposable. Mine is about 3 to 4 years old. It isn't even heavy enough to use as a paper weight. For now I've shuffled in another unit I had elsewhere in the home. In time I may play with the power supply issue you suggest, having little to lose if it is not the problem.

    Thank you.

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  • Posted on Jul 03, 2007
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One possibility is that the power supply section isn't providing the correct voltages. If you have a little tech savvy, and a volt meter, check the output voltages. There should be a +5 volt line, +12 to +14 volt line, and perhaps a -40 (approx) volt which supplies the display. Early VCRs often had this latter voltage, but later ones not having much of a display might not. Anyway, check for these voltages- the +5 volt should be right on within .2 volts (4.8 - 5.2volts). If this voltage is off much more than this, problems are likely. Defective components would likely be the electrolytic capacitors in the power supply, most of which are used to filter those noted voltages. If by chance one or more caps. is defective, replacements are found at Digi-Key Corp. Their Panasonic FC capacitors are what I generally use for most of these replacements. Mouser Electronics will have suitable parts too. Beyond this problem, maybe an erratic mode switch, or other logic problem. The kind of problem you describe may be difficult to diagnose. If this is a late VCR (10 years old or less), most of these are of the disposable variety, unlike the old rigs which were built like tanks, comparatively speaking.

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I have a number of these Casio and Citizen watches. This watch does not use GPS for the time keeping. It uses a land based broadcast time signal. There is public information about where the signals come from for your area. The technical breakdown of the time code signal is public access information.

The instruction manual of the watch has the information about when your watch should automatically receive the time signal, and how to set up the watch. Many of the manuals also included a map showing the time signal coverage, and includes the time of day information to show when the signal is strongest.

Make sure the watch settings are for your time zone. This is important. If the main time zone is not for your area it will be trying to receive the signal at the wrong frequency at the wrong time of day. There are areas where the signal may not be able to be received. You can get the mapping for this from the service that the watch has been set to use.

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How to set your Global Atomic G-Force digital watch

This watch says "Strong Ideas" on the back instead of a 4 digit number.

Press LIGHT briefly and your LCD will be back lit for 5 seconds.

Press MODE to cycle through normal, alarm, dual time, and stopwatch display mode.

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Do not use solvents to clean the watch, use only a dry or water moistened cloth.
Do not use buttons when the watch is wet. Water may penetrate the watch and cause damage to it.
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