"nipperchipper" wrote in message
...

"Ron" wrote in message
...
I have two Panasonic VCR's, model numbers PV-V4540 and PV-9450.

They are almost idenical on the outside and very simular on the
inside.

The "newer" model - PV-V4540 - seems to have a head going bad from
everything I've read.

The PV-9450 works fine, but doesn't have the features that the PV-
V4540 has.

I would like to install the head unit from the PV-9450 (the older one)
in the PV-V4540 (the newer one).

They look the same, but are they the same? And if I swap the
headunits, will the alignment be the same?

Here are pics of the head units. The one thing that I wondering about
is the "arm" on the center post of the (newer) PV-V4540...what is
that?



PV-V4540 head unit
http://i126.photobucket.com/albums/p...IM002417-1.jpg

PV-9450 head unit
http://i126.photobucket.com/albums/p...IM002411-1.jpg

PV-V4540 face
http://i126.photobucket.com/albums/p...IM002414-1.jpg

PV-9450 face
http://i126.photobucket.com/albums/p...IM002413-1.jpg


from the parts list pvv4540 uses the beliow listed upper cylinder head
VEGS0427 ( A )
VEGS0428 ( B,C,D )
VEGS0429 ( E,F )

pv9450 uses
VEHS0571 ( A )
VEHS0570 ( B,C )
VEHS0567 ( D,E )
not much help but swapping may not hurt



Given that info, it's probably not going to work right. Hifi sound is
critical of correct head performance, so if there are any specification
differences between the head drums, there will likely be a problem. As far
as swapping the entire head drum assembly goes, you will often find that
even identical-looking assemblies won't fit because a screw hole or chassis
locating boss has been deliberately offset to prevent it. As for having to
use a puller to remove the upper head drum (which I have always thought is a
far more straightforward job than swapping the whole assembly) on some
machines, that used to be a given, but I always found that Pans came off ok.

Not that for some years it's been a viable proposition to replace heads,
even on 'good' machines. The cost of the head drum alone, without any
labour, exceeded tha cost of a bargain warehouse all singing and dancing
machine with a shiny new 2 year warranty ...

Arfa