Panasonic VCR; a grey screen unless you pause, FF or REW???

[reverse_side]

Lots of talented people on this forum, if anyone knows how to explai
this problem I'd be very grateful

It's the NV-FJ710B (Tape Library System and very speedy fast forwar
and rewind capabilities flavour of a Panasonic workhorse) - just pas
it's 5th birthday and without a peep of a problem, suddenly won't pla
tapes properly anymore.

Symptoms: cueing forward or backwards is fine, pausing and slow fram
advance is crystal too, but playing just gives a pure grey scree
with audio in the background? The tapes won't play in another VCR
vice versa and the usual tracking & v-lock just made me frown
:crybaby: Pre-recorded tapes are a no-no now too.

Is this repairable or have I got to start looking at DVD RW / har
drive / combi alternatives

 

[nvic]

Possible missaligned or busted heads

 

[Asimov]

"reverse_side" bravely wrote to "All" (09 Feb 06 18:01:52)
--- on the heady topic of "Panasonic VCR; a grey screen unless you pause, FF or REW???"

re> Subject: Panasonic VCR; a grey screen unless you pause, FF or REW???
re> Xref: core-easynews sci.electronics.repair:357884

re> Lots of talented people on this forum, if anyone knows how to explain
re> this problem I'd be very grateful.

re> It's the NV-FJ710B (Tape Library System and very speedy fast forward
re> and rewind capabilities flavour of a Panasonic workhorse) - just past
re> it's 5th birthday and without a peep of a problem, suddenly won't play
re> tapes properly anymore.

re> Symptoms: cueing forward or backwards is fine, pausing and slow frame
re> advance is crystal too, but playing just gives a pure grey screen
re> with audio in the background? The tapes won't play in another VCR,
re> vice versa and the usual tracking & v-lock just made me frown
re> :crybaby: Pre-recorded tapes are a no-no now too.

re> Is this repairable or have I got to start looking at DVD RW / hard
re> drive / combi alternatives?


It may be simply one clogged or really dirty playback head.
OTOH that head may be chipped.

The typical symptom here is that the special effects heads work fine
but playback is noisy or blanked.

Read the faq to learn how to clean the heads safely.

A*s*i*m*o*v

.... If all else fails, hurl it across the room a few times!

 

[reverse_side]

Thanks nvic/asmiov; I tried a careful head clean with a small amoun
of meths, can u adv where the faq is for doing cleaning head
properly etc, the one on the bottom is mainly for forum admin etc.

wouldn't be surprised if there's an olympic event of VCR shot pu
soon

are the chipped/misaligned symptoms visible btw?

just tested playback and it looks so close to being fine, grey the
good picture, then it fights but then goes grey again (or gray as yo
guys may like instead!).... grrrr. 300 joules, stand clear

 

[Asimov]

"reverse_side" bravely wrote to "All" (10 Feb 06 12:01:08)
--- on the heady topic of "Re: Panasonic VCR; a grey screen unless you pause,
FF or REW"

re> Subject: Re: Panasonic VCR; a grey screen unless you pause, FF or REW
re> Xref: core-easynews sci.electronics.repair:357963

re> Thanks nvic/asmiov; I tried a careful head clean with a small amount
re> of meths, can u adv where the faq is for doing cleaning heads
re> properly etc, the one on the bottom is mainly for forum admin etc.

re> wouldn't be surprised if there's an olympic event of VCR shot put
re> soon!

re> are the chipped/misaligned symptoms visible btw?

re> just tested playback and it looks so close to being fine, grey then
re> good picture, then it fights but then goes grey again (or gray as you
re> guys may like instead!).... grrrr. 300 joules, stand clear.


The faq has a new address so you should search for it. There was a
change of ip server so the address seen around might not be right.

A small 30x lens and bright light is needed to inspect the head chips
for damage. An effects head looks different from a play head (gaps).
The head gap looks like the points of the z here: ==z==
Tiny wire coils can be seen behind the pole pieces that protrude.
The gap is wide or narrow depending if it is an effects or play head.
A chipped head will have half a corner missing: ==... or ...==
Or worse: ..... just jagged edges or completely broken off.

As for cleaning the heads, the most important warning is to never
scrub up and down. The next most important warning is not to use
anything that can get snagged, for instance cotton swab is a no, no.
There are special chamis swabs made for vcr head cleaning.

A simple method I use is with the machine unplugged. Take a 5cm (2")
long strip of printer paper 1cm (3/8") wide dipped in isopropyl 99%.
Place the strip along the tape path edge over the bottom drum and
shuttle the top drum back and forth so that the head scrubs against
the strip of paper. Apply only gentle pressure with the fingertips.
Turn the strip over or use a new strip until it no longer streaks with
dirt. Do this for each head in turn. It seems crude but is quite safe.
Let the alcohol dry off before use.

A*s*i*m*o*v

 

[b]

reverse_side ha escrito:

Thanks nvic/asmiov; I tried a careful head clean with a small amount
of meths, can u adv where the faq is for doing cleaning heads
properly etc, the one on the bottom is mainly for forum admin etc.

wouldn't be surprised if there's an olympic event of VCR shot put
soon!

are the chipped/misaligned symptoms visible btw?

just tested playback and it looks so close to being fine, grey then
good picture, then it fights but then goes grey again (or gray as you
guys may like instead!).... grrrr. 300 joules, stand clear.

if the picture is cycling off and on or good and bad, replace the pinch
roller. This is probably skewing the tape up and down on the AC head.
Watch its behaviour with the top off and see if the tape gets slightly
wrinkled at any stage of the tape path.
-B.