[TechAssist] Re: AC head adj.


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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