[TechAssist] Re: JVC SR-L901U vcr video problem
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 16 Jun 2005 13:58:17 -0400
These record and play at 8 hr and 24 hr only. an EP VHS recording will play
on the 8 hr speed setting. That is the speed I use to do the alignments on
these and then I do a 24 hr speed recording as a check because that is the
way they are normally used. Just seems odd that they would work for 10 years
and then the preamps or lower drums would go bad. There are a few
electrolytics in the preamps but changing them has no effect on this
problem. I guess when the opportunity arises I will have to sub a known good
preamp and lower drum. The preamp is getting all of the control signals it
is supposed to get. Practically all of these that come in have servo and
video problems due to dried out electrolytics but that is a different
problem.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "Damon" <DamonEB@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, June 16, 2005 9:06 AM
Subject: [TechAssist] Re: JVC SR-L901U vcr video problem
> Been years since I worked on time lapse.... bad RF envelope on one head,
try
> recording at the fastest speed and verify tape tension first.
> Since you already replaced the head, leave it in for now.
> If your envelope doesn't come up at the fastest speed then the switching
amp
> isn't turning on that head's amplifier circuit.....or the rotary
transformer
> isn't coupling the signal to the secondary side so the amp can do it's
job.
>
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: "Jerome Silverman" <greentron@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, June 15, 2005 8:36 PM
> Subject: [TechAssist] JVC SR-L901U vcr video problem
>
>
> > This 1995 time lapse vcr has an RF envelope characteristic of a video
head
> > assembly with one head badly worn. Installing new head does not help. We
> > service a lot of units of this model and have accumulated three with
this
> > same problem. Has anyone fixed this problem on this model?
> > Jerry Silverman
> > Greentron Inc
> > 4 Newland Ave Greenville SC 29609
> > Fax/Phone 864 232 3889
> > greentron@xxxxxxx
> >
>
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