[TechAssist] Re: JVC SR-L901U time lapse playback problem
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 24 Feb 2004 17:11:49 -0500
Swapped and unswapped! This model does something for the 24 hr record that I
have never seen in another model. The record RF is gated so that only every
third field is recorded with an EP head. That means that only 10 pictures
per second are recorded. In playback 30 pictures per second are needed for
the NTSC monitor, so it is supposed to play the same picture 3 times. But it
is only playing back 10 pictures per second with a gap between each picture.
According to the service manual, the 4 EP heads are supposed to be switched
according to a "preset algorithm" to play back the same picture 3 times so
that there is no gap in the RF envelope. It just is not doing it.
If I play back the 24 hour recording in the 8 hour speed it plays OK, but it
is supposed to play the 24 hour recording in the 24 hour speed too.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "peggs" <peggs@xxxxxxxxxxxxx>
To: <greentron@xxxxxxx>; <techassist@xxxxxxxxxxxxx>
Cc: <techassist@xxxxxxxxxxxxx>; <Techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 24, 2004 11:30 AM
Subject: [TechAssist] Re: JVC SR-L901U time lapse playback problem
> So you've swapped the Heads ???
>
> Peggs
>
> At 08:39 PM 2/23/04, greentron@xxxxxxx wrote:
> >A couple of these vcrs did have worn out heads, which I could tell from
> >playing a prerecorded tape in the 8 hr speed. When I then tested the unit
> >in the 24 hr record/play mode is when I saw the problem.
> > > sounds like bad heads.
> > > Asti sells 'em for $45.00 cost.
> > > Might buy 1 set to see..............
> > >
> > > Peggs
> > >
> > > At 09:42 AM 2/23/04, J Silverman wrote:
> > > >Has a problem with the 24 hour playback. Supposed to record 10
> > pictures per
> > > >second and then play the same picture back 3 times to provide
> > compatibility
> > > >with the NTSC system. Only plays back 10 pictures per second causing
> > snow on
> > > >the monitor. Works fine on 8 hour record mode and the 24 hour
recordings
> > > >play back OK in the 8 hour mode. Appears as if something is wrong
with the
> > > >24 hour playback head select but all the service manual says about it
is
> > > >that the 24 hour playback head select is done with an "preset
algorithm".
> > > >Have 5 units here with the same problem.
> > > >Jerry Silverman
> > > >Greentron Inc
> > > >4 Newland Ave
> > > >Greenville SC 29609
> > > >864 232 3889
> > > >Fax 271 2080
> > > >mailto:greentron@xxxxxxx
> > > >
> > > >
> > > >
> > >
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