Question about JVC HR-S3912U S-VHS VCR

1 Answer

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?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert who has answered 200 questions.

  • Expert
  • 254 Answers
Re: VCR stuck in auto time set mode

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.

Posted on Jul 03, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Lost manual. Cannot get HR A591U JVC VCR program to record a future cable tv program. Seems I have tried everything but it does not record as I set up. It will record an existing show by pressing...

Timer Recording JVC VCR HR A591U
Timer recording can be programmed on-screen with
the remote control. The built-in timer allows automatic
unattended recording of up to 8 programs within 1

EXAMPLE: Program a timer recording for the 26th day,
channel 125 (CATV), 11:00 - 11:30 PM on timer program
number 1 (Tape speed: EP).

When a TV is connected with an audio/video cable, turn the
TV and this VCR on and select the video input mode on the

• After timer recording is completed, the VCR turns off
• You can program the timer recording while a regular
recording is in progress; the menu screens will not be
• The timer recording will start at 20 seconds before the time
you predetermined.

Press MENU on the Remote.
Check the “TIMER REC SET”
option is selected, then press

Press SET –/+ to select one of
the program lines, then press

Press SET –/+ to select the
date, then press ENTER.

Set the start time, end time,
channel and tape speed as in
step 3.
NOTE: To record from external
source, press SET –/+
and set the channel to
"L". "L" will appear next
to CH 125 (or 69).

To enter other programs,
repeat step 2 through 4. Or,
press MENU twice to return
to the normal screen.

Press TIMER on the Remote.
The power will go off, the
TIMER REC indicator ( ) will
light and the VCR stands by
for recording.

To cancel a program:

Press the SET –/+ to select the
“TIMER REC SET” option in the
MENU. Then press SET –/+ to
select the unnecessary program,
and press CANCEL to cancel the

Aug 28, 2010 | JVC VCRs

1 Answer

I have a sanyo television but no remote.

unplug machine for about a WHOLE day, sometimes two days (believe it or not!) and it may go back to default mode.
P.S. how did it go into video mode in the 1st place

Jan 11, 2009 | JVC HR-S3901 S-VHS VCR

1 Answer

How do I use my VCR with the DTV Converter Box that I had to get?

You only have three choices that I know of. The first two are a bit expensive though. 1) Buy a digital TV, then you could split your antenna cable to the TV and Converter box. Then use the converter box as the tuner for the VCR. 2) Buy a digital VCRand do the same thing using the converter box as the TV's tuner. or 3) Get a second Converter box and split the incoming cable between the two, using one for the TV and the other for the VCR. If you use any of these ideas, remember that You need to not have the VCR and the "new" tuner for the TV set to play on the same TV channel, and that you switch teh VCR out of VCR mode with the TV/VCR button, so that you get a clear signal on the other channel. If anyone has an easier solution, I too would like to know about it, seeing as I am in the same position and would like to avoid this problem as well.

Jan 02, 2009 | JVC HR-J692U S-VHS VCR

2 Answers

VCR/Cable TV Connection

I guess you are using the cable TV feed looped through the VCR to the TV set.

Make sure you did not confuse the in and out loop of the VCR.

In the VCR menu, or on the remote there is usually a button called TV/VCR (Video). Make sure it is in the TV mode to watch the cable. In the VCR (Video) mode, the TV must be on the VCR's designated channel to watch the VCR, and the VCR tuner is used to watch the cable channels.

Jerry G.

May 24, 2008 | VCRs

1 Answer

VCR doesn't work

The DVD has to be off so that it allows the VCR signal to pass through. Also make sure the VCR's output is set to channel 3 (little tiny slide switch in the back by the VCR's antenna jacks).

Jan 03, 2008 | JVC HR-S3901 S-VHS VCR

1 Answer

Hitachi F361 VCR Digital Auto Tracking (not 631!)

I had the same problem when I got the TV from someone and I didnt have a remote. I went out and got a ONE FOR ALL remote and once I got it set up I had it in VCR mode and hit the AV button and now I can get to the channels. Hope it works for you.

Oct 31, 2007 | Hitachi VTFX631A VCR

1 Answer

Loud noise on rewind

You may have an idler gear wheel which has been damaged- perhaps broken/worn gear teeth or something afoul in it's drive mechanisms. Check this idler which sits down in between the supply and take-up spindles. You should be able to see this with no tape loaded. This idler should also move freely from supply to takeup- if it is sticky in movement this could be the problem. If your idler is broken, you may be able to replace it. Check with a service center- or a parts supplier. MCM electronics is one such supplier- there are others.

Oct 01, 2007 | JVC HR-S3901 S-VHS VCR

1 Answer

How to hook-up my VCR to NTSC TV?

Zohar, You must remember that various regions in the world have different Broadcast systems. TVs and VCRs are manufactured for playback and Recording in different regions. But, while the JVC HR - J 437MS is a Multi System VCR as far as Playback is concerned, It has only a PAL Tuner. So , while you can watch NTSC Tapes, you cannot tune a NTSC Broadcast through its tuner, and watch on your TV. You will only get a B&W picture. To atleast view NTSC Tapes, use the Remote of the VCR, and set System to AUTO or NTSC. Again, there are 2 versions of NTSC - the 3.58 and the 4.43 ones. Certain regions of the US broadcast in NTSC 3.58, and some in NTSC 4.43. So select carefully, Similarly, bring up the TV menu, and select AUTO or NTSC for TV reception. Now you will be able to view American broadcasts in color.But I suggest you set System to AUTO, as then you can watch your earlier Tapes collection from Europe also. As for connections, it is fairly simple. I am uncertain if your VCR has a 21 pin euroconnector (SCART)but it is unlikely. You will be having Audio L and Audio R out ockets at the rear of the VCR, alongwith Video Out socket. Just connect suitable RCA cables from these OUT sockets to the Video and Audio IN (L) and Audio IN (R) siockets on the TV. select AV input, and you are ready. check it out. 99% it will be work out.

Jun 20, 2007 | JVC HR-J437MS VCR

1 Answer

Recording instructions

First, whether or not you can do this will depend on cable box useage, and how the VCR is hooked up. In the earlier days of cable TV, & off-air reception, this was a simple task. If you have a satellite receiver box or cable box which is used to tune the channel, rather than using the TV itself or the VCR tuner, then recording one channel while watching another may not be possible. While I don't know the capabilities of newer sat/cable boxes, older ones sent just one signal out to the external equipment (TV etc.) That one signal (channel) is all that is available. If you received a manual with the sat/cable box, see if it says anything about this issue. That being said- if you don't use a sat/cable box, but instead use your TV or VCR to select the channel you are watching, then assuming the VCR is hooked up inline with the TV, just setting the VCR/TV option to TV will pass all channels through to the TV, and you can then use the TV to select whatever channel wished, while the VCR is recording something else. Hopefully I haven't confused you. If another contributor has some additional info on the capabilities of sat/cable boxes of today, please read their contribution.

May 22, 2007 | GE VG4052 VCR

2 Answers

JVC HR-S3901 S-VHS / Switching from TV to VCR no longer works . . .

Ifyou do not see the VCR/TV button switch on the front panel, then its a problem most likly with the firmware in the microprocessor. If you do see the VCR/TV indicator switching in or on the front panel display, most likly a defective RF modulator/switcher or RF antenna pack. You may still be able to get one from like MCM or tritronics or PTS corp can rebuild it for you. I have seen this type of break down many times with VCR's as we used to do hundreds of VCR repairs a day as we did factory service for several companies in the NY/NJ area. Good Luck Please do not forget to rate this thread.

Dec 10, 2006 | JVC HR-S3901 S-VHS VCR

Not finding what you are looking for?

158 people viewed this question

Ask a Question

Usually answered in minutes!

Top JVC VCRs Experts


Level 3 Expert

4518 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

alexander woolfolk
alexander woolfolk

Level 2 Expert

276 Answers

Are you a JVC VCR Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides