[TechAssist] Re: thomson vcr,picture shaking,vibrate & no sound.

From: "rahman qirat" <rahmanq@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx
Date: Sat, 16 Feb 2002 16:14:20 +0800

this case have been closed!
thank to Jerry $ Jeff and all guys,
this is truth,the problem cause by 180 degree and backward.
this vcr not using the ordinary drum head with hole on the centre than fix 
to the motor shaft than fix the 2 pcs of screw.
but it using the drum head attach with the long shaft and together with 
rotary transformer.
when to replace the head you need to dismantle all the part at head drum 
block-motor coil,magnet casing,collar etc.
when fix back you need to insert the drum head shaft into the centre hole 
than put the collar from the back,thigthen the screw.then fix the motor coil 
and lastly the magnet casing.
at the top of drum head next to the 2 pcs of screw for head eye,there are 
one hole.only at one head eye,there ones is nothing,this is the drum head 
mark,
then at the motor casing also have one hole at the centre.
what I do,first drum hole and magnet hole must at the same position top and 
bottom.
then play the tape,result picture still no good,
then I placed the top hole at one position then I turn bottom hole little 
bit clockwise.play the tape,picture little bit improve,
I do it many times untill I get a best output of picture,
Jerry are right,if picture good at the same times sound also will be 
come-out,it was happen the sound also come-out,no need to replace the ic!.I 
test many times using many tape all ok as normal video.
thank great to you all,(sorry my english may be not so good)


>From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: thomson vcr,picture shaking,vibrate & no sound.
>Date: Tue, 12 Feb 2002 12:06:36 -0500
>
>
>On vcrs where the video head assembly is replacable, with some exceptions,
>it is possible to mount the head opposite of the position of the original
>head with respect to the azimuth of the actual video pickups.
>This creates two problems. First, instead of no guide alignment or just a
>minor guide alignment being required, major adjustments are required to get
>a good RF envelope with a prerecorded or alignment tape. Second, after
>alignment, the chroma subcarrier is 180 degees out of phase with what it
>should be so you just get a black and white picture. Any flashes of color
>are due to pickup from adjacent video tracks on the tape.
>However, if no adjustments are made, the vcrs own new recordings will play
>normally on that vcr.
>Most video head assemblies have colors or markings that are clues to the
>orientation. I usually make a mark on the head assembly and the mounting 
>hub
>before removing it so that I can reinstall it or the replacement properly.
>Usually, the colors on the head assembly are reproduced on the circuit 
>board
>attached to the rotary transformer.
>Once in a while, a replacement head assembly is marked incorrectly. In this
>case I try reinstalling it reversed 180 degrees before fooling with
>adjustments. Also the pickup height can be incorrect if any dirt or foreign
>matter is on the mounting seat, which just confuses matters.
>These errors were usually immediately obvious on vcrs with manual tracking.
>Autotracking creates a whole new set of symptoms if the new head is not
>correctly installed. The autotracking should be turned off or defeated when
>installing or adjusting a new head.
>Jerry Silverman
>Greentron Inc
>4 Newland Ave
>Greenville SC 29609
>864 232 3889
>Fax 271 2080
>mailto:greentron@xxxxxxx
>----- Original Message -----
>From: "rahman qirat" <rahmanq@xxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Tuesday, February 12, 2002 10:21 AM
>Subject: [TechAssist] Re: thomson vcr,picture shaking,vibrate & no sound.
>
>
> >
> > Jerry & Jeff,can I get explanation " heads are on backwards "
> >
> >
> > >From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
> > >Reply-To: techassist@xxxxxxxxxxxxx
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Subject: [TechAssist] Re: thomson vcr,picture shaking,vibrate & no 
>sound.
> > >Date: Mon, 11 Feb 2002 15:22:21 -0500
> > >
> > >
> > >Yes
> > >Jerry Silverman
> > >Greentron Inc
> > >4 Newland Ave
> > >Greenville SC 29609
> > >864 232 3889
> > >Fax 271 2080
> > >mailto:greentron@xxxxxxx
> > >----- Original Message -----
> > >From: <MDileo0000@xxxxxxx>
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Sent: Monday, February 11, 2002 2:35 PM
> > >Subject: [TechAssist] Re: thomson vcr,picture shaking,vibrate & no 
>sound.
> > >
> > >
> > > >
> > > >  Jerry, you mean the head is 180 degrees off, right?
> > > >
> > > > Dominic DiLeo
> > > > Atlantic TV
> > > > Freeport, Maine
> > > >
> > > >
> > > >
> > > > In a message dated 2/11/02 2:26:10 PM Eastern Standard Time,
> > > > greentron@xxxxxxxxxxxxxxxx writes:
> > > >
> > > > <<
> > > >  My first guess is that the heads are on backwards. If the audio
>problem
> > >does
> > > >  not clear up when the heads are correctly installed and aligned,
>check
> > >the
> > > >  back tension and the tape path at the audio/control head.
> > > >  Jerry Silverman
> > > >  Greentron Inc
> > > >  4 Newland Ave
> > > >  Greenville SC 29609
> > > >  864 232 3889
> > > >  Fax 271 2080
> > > >  mailto:greentron@xxxxxxx
> > > >  ----- Original Message -----
> > > >  From: "rahman qirat" <rahmanq@xxxxxxxxxxx>
> > > >  To: <techassist@xxxxxxxxxxxxx>
> > > >  Sent: Monday, February 11, 2002 11:38 AM
> > > >  Subject: [TechAssist] thomson vcr,picture shaking,vibrate & no 
>sound.
> > > >
> > > >
> > > >  >
> > > >  > thomson vcr,vth 22b,made in singapore,used mostly japanese parts.
> > > >  > first problem,insert tape,few second than eject back.no play.
> > > >  > realightment all gear position,now tape run ok.but picture was
>blurr.
> > > >  > replace new drum head and play the tape but the picture output is
> > >shaking
> > > >  > and vibrate and the colour output with sometime black/white then
> > >change
> > >to
> > > >  > colour than few second change back to b/white,on/off.what are the
> > >real
> > > >  > problem?
> > > >  > playback also no sound,if that means the ic la 7282 also faulty?
> > > >  >
> > > >  > _________________________________________________________________
> > > >  > Get your FREE download of MSN Explorer at
> > > >  http://explorer.msn.com/intl.asp.
> > > >  >
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> > > >  >
> > > >   >>
> > > >
> > > >
> > > > Dominic DiLeo
> > > > ------------------------------------------
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Follow-Ups:
- [TechAssist] Re: thomson vcr,picture shaking,vibrate & no sound.
  - From: J Silverman
[TechAssist] Re: thomson vcr,picture shaking,vibrate & no sound.

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