[TechAssist] Re: AC head adj.
- From: "Ray Lufkin" <Rlufkin@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 24 Nov 2001 10:30:19 -0500
Ooops maybe i was thinking about special alignment tapes....again I heard
this at different manufacturer's schools and it kinda stuck in my mind like
a bad date...but i'm pretty sure that vhs tape is "printed" not actually
recorded.
----- Original Message -----
From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 23, 2001 10:57 PM
Subject: [TechAssist] Re: AC head adj.
>
> Ray:
> A reader on this list provided me with 3 links relating to "Optically"
recorded
> magnetic media. It appears that it is related to 8 mm and only on special
tape.
>
> I still contend that optically recorded alignment tapes, for consumer
version
> VCR's, are not a reality because of the different composition of the media
and
> foot print the optical track leaves. The optical track width is 0.15um
when a
> standard VHS SLP track width of 1 field of video is 19um wide.
>
> I don't see the benefit of designing an optical recording format that will
be
> compatible with a standard VHS playback process. In theory optical
recording
> could increase the amount of data stored on a conventional VHS tape at
least ten
> times. Why would they engineer a format that would not take full advantage
of
> that gain of storage area?
> It does not seem logical that millions of $$ would be spent to design a
system
> to optically record to standard VHS tape and have it compatible with our
good
> old 20 year + VHS magnetically recorded tapes.
>
> Below are the links that Mr. Adams provided me and I will provide for
those who
> care to read about optical recording on magnetic media.
>
> http://www.strl.nhk.or.jp/results/annual/r35.html#i3
> http://www.nist.gov/public_affairs/guide/atp09.htm
> http://www.jsap.or.jp/ap/1998/ob6701/p670058.html
>
> Dennis Viereck
>
>
>
>
> Ray Lufkin wrote:
>
> > Hi Dennis,
> > Not sure how tape is recorded at the factory but at alot of
industry
> > schools i've been to always referred to the tape being optically
recorded. I
> > don't believe the tape has touched metal before you put it in your vcr..
Can
> > you imagine how long it would take to record all the tapes out there in
the
> > world? No its a manufacturing process. I have some book somewhere that
has a
> > description about it. See if I can find it. In the meantime have a nice
> > Thanksgiving!
> >
> > ----- Original Message -----
> > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, November 22, 2001 12:32 PM
> > Subject: [TechAssist] Re: AC head adj.
> >
> > > Ray
> > > In your response you made reference to a specific tape, "Must be an
> > > optically recorded tape " I have never heard of this type of tape.
What is
> > it?
> > > My understanding of video tape is that it is 100% magnetic media. How
does
> > > optics play into this?
> > >
> > > I understand that the magnetic footprint placed on the tape must match
a
> > VHS
> > > standard. That is why the master must be recorded accurately to make
all
> > VHS
> > > machines compatible to the VHS standard.
> > >
> > > Dennis Viereck
> > >
> > >
> > > Ray Lufkin wrote:
> > >
> > > > To adjust a/c head find the control track pulse usually around the
servo
> > > > multi monostable area. Find it with your scope and adjust ac head
height
> > > > (big screww on thread) using the big screw for maximum control track
> > pulse
> > > > amplitude. Then adjust azimuth for crisp audio. Use a high quality
new
> > > > pre-recorded movie tape not one recorded on another vcr. Must be an
> > > > optically recorded tape or it will have ac error already on it.sAll
> > > > adjustments should be very close to start with so if you have to
crank
> > them
> > > > something is wrong. Alot times it's a bad pinch roller crushing and
> > pulling
> > > > the tape off the phsical track of the head. Best way to test for
that is
> > see
> > > > how the tape path looks in search modes.Watch tape path closely and
go
> > in
> > > > forward/reverse tape search and look for crinklies. Been working on
> > vcr's
> > > > since 1981.
> > > >
> > > > ----- Original Message -----
> > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Thursday, November 22, 2001 11:04 AM
> > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60
> > > >
> > > > >
> > > > > Haven't adjusted them.
> > > > > I like to leave them alone, especially in stereo/hifi sets.
> > > > > But may have to, as a last resort.
> > > > >
> > > > > -Ed-
> > > > >
> > > > > teltek@xxxxxxxxxxx
> > > > > TEL-TEK ELECTRONICS.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Jeff Dougherty" <jeff@xxxxxxxxxxxxxxxxxx>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Thursday, November 22, 2001 10:31 AM
> > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60
> > > > >
> > > > >
> > > > > >
> > > > > > There are two or three screws at the base of the Ac heads.
> > > > > > Do not adjust them too far. If you do, it could take a lot of
time
> > to
> > > > get
> > > > > > the audio tracking close to what it was originally.
> > > > > > You use the adjustments for the head tilt and azimuth
> > > > > >
> > > > > > Jeff
> > > > > > mailto:Jeff@xxxxxxxxxxxxxxxxxx www.9-11-2001tragedy.com
> > > > > > FAX 1-413-280-0677
> > > > > > Intrepid Video & Electronics
> > > > > > Harrisburg, PA 17111
> > > > > > 717-909-8844
> > > > > > www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com
> > > > > > ----- Original Message -----
> > > > > > From: "Shaun" <ssroark@xxxxxxxx>
> > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > Sent: Thursday, November 22, 2001 12:07 AM
> > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60
> > > > > >
> > > > > >
> > > > > > >
> > > > > > > do you know how to adjust the audio head?
> > > > > > > ----- Original Message -----
> > > > > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
> > > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > > Sent: Wednesday, November 21, 2001 11:22 AM
> > > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60
> > > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > > It's Stereo/HiFi, cleaned all the heads..no go.
> > > > > > > >
> > > > > > > > -Ed-
> > > > > > > > teltek@xxxxxxxxxxx
> > > > > > > > TEL-TEK ELECTRONICS.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > ----- Original Message -----
> > > > > > > > From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx>
> > > > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > > > Sent: Wednesday, November 21, 2001 11:16 AM
> > > > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60
> > > > > > > >
> > > > > > > >
> > > > > > > > >
> > > > > > > > > Did you clean control/audio head?? Head could be bad or
is
> > this a
> > > > > HI
> > > > > > FI
> > > > > > > > > audio unit with audio heads on Video head drum, If so try
> > > > cleaning
> > > > > > the
> > > > > > > > > head assy .
> > > > > > > > > Phillip R Hull
> > > > > > > > > phil245@xxxxxxxxxxxxx
> > > > > > > > > ----- Original Message -----
> > > > > > > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx>
> > > > > > > > > To: "AAAA TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > > > > > > > > Sent: Wednesday, November 21, 2001 11:07 AM
> > > > > > > > > Subject: [TechAssist] Older RCA VCR PSVR60
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Model PSVR60
> > > > > > > > > >
> > > > > > > > > > Have a VCR here that came in with no sound.
> > > > > > > > > > Found a module that looks very similar to the Sony
> > SBX1637-11,
> > > > > which
> > > > > > I
> > > > > > > > > > replaced. Brought the low volume back from tuner.
> > > > > > > > > > But when tape is played, the audio sounds a little
raspy,
> > almost
> > > > > > like
> > > > > > > > > > cracked speaker.
> > > > > > > > > > My question....is this module replaceable with the
> > SBX1637-11,
> > > > or
> > > > > am
> > > > > > I
> > > > > > > > > > looking for more sound problems.
> > > > > > > > > > This is an older VCR, 10 years, approx.
> > > > > > > > > >
> > > > > > > > > > TIA.
> > > > > > > > > >
> > > > > > > > > > -Ed-
> > > > > > > > > >
> > > > > > > > > > teltek@xxxxxxxxxxx
> > > > > > > > > > TEL-TEK ELECTRONICS.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
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