Toshiba TV29C90 problem; Image fades to black...

[Alan Kennedy]

Follow up to this thread.

Managed to get the rear door for the NVEX1B and spent an enjoyable(!!)
4 hours fitting it tonight - amazed that the whole thing actually
worked at the end of the evening. To remove the old door and fit a new
one required major disassmembly including 8 or so ribbon cables (I
hate those things!) and removing 2 circuit boards, and disconnecting
the lens and control units and all casing parts.

Nothing like the satisfaction of not having to pay for a professional
repair!

Mike - if you didn't manage to get yours repaired yet, I can post more
details of how to remove the retaining screws.

Alan

Sorry I can't help with this but I have a similar problem with a
broken power/function switch - who did you obtain the part from and
what is the part number? I have been told that to fix the switch the
whole rear panel must be replaced!

Alan

On Fri, 14 May 2004 20:43:00 +0100, "Binky" <binky@binkymail.com
wrote:

I need to replace the rear flap door of this unit. I have the replacement
part, I have moved all the necessary components from the old to the new one,
but cannot find how to access the screws retaining the hinge pins. I have
had all the sections apart from all sides but still cannot seem to gain
access. 2 of the PCB's pull out of mounting sockets but the main one is
still in the way. There doesn't appear to be an obvious route in via the
tape chassis either. I have the technicians exploded parts diagram.

Any help appreciated.

Mike


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[Alan Douglas]

Hi,
The windings would be in parallel for 115V, series for 230V.

I believe you set the brush position for minimum sparking; the
voltage is immaterial.

I use a repulsion motor to run a belt sander, but the brush holders
are fixed. I haven't operated one with movable holders in about forty
years.

Regards, Alan

 

[GS]

Right you are on the no load speed.....not untypical to find near
synchronous speed in my experience. Trying the windings in parallel
(briefly touching power) showed no attempt at torque and just high
current (windings were same resistance.....and no short to case etc).
Reversing the phase (as I indicated) of either winding also produced
just a heavy current draw and very little torque so I noted the phase
that caused a reliable start and run with no attendant heating etc.

The one thing that doesn't seem to quite ring a bell with what little I
recall about a pure repulsion motor is why the shorted brush pair is at
90 degrees to each other and not 180 degrees as I would have
thought.....there's an answer there thats escaping me also.

Gord

 

[Tim Wescott]

alanh_27@yahoo.com wrote:

cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?

Feed through a round tube.

Look good.

Lacing is still alive and well, it's used for many harnesses in
aerospace equipment, although tie-wrap is being used as well.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Matt Whiting]

alanh_27@yahoo.com wrote:

cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?

I think it looks nicer, but functionally I don't believe there is any
difference. Both methods keep the wires neat and organized.


Matt

 

[CJT]

alanh_27@yahoo.com wrote:

cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?

Lacing might contribute a little extra strength in the long direction.

Plus, as others have noted, it looks better.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

 

[pctech420]

Dave,
Are you still looking for this
ML2 UR CM10 C182Z R2-4M 125VAC 1 2, I believe I have excactly what you are
looking. I was about to put it up for auction, when I saw you post. I have
Picture I can email you, Lemme know before I put it on ebay.......

pctech420

 

[Phil]

"w_tom" <w_tom1@hotmail.com> wrote in message
news:41E02BAE.B94304EF@hotmail.com...

Lacing (if it really a nylon laced tube) protects wires from
failure due to constant vibration (ie automotive). Also the
lacing can hold cable together over long distances without
compressing insulation too tightly at the nylon ty wrapped.
Missing information is the environment for that cable. Looks
really have little to due with why things are done.
Furthermore, sometimes a better looking (cleaner) installation
can make things electrically worse.

alanh_27@yahoo.com wrote:
cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?

Tie-wrapping can also turn a bundle of RF cables into a bundle of RF
filters!

 

[LASERandDVDfan]

If this deck has a reel idler (Sony call it a pendulum), which
swings between the two reels, then I would suspect that it is
not pulling smoothly, causing the tape to speed and slow.

This model uses two independent brushless motors for each of the spools. -
Reinhart

 

[Alan Douglas]

Hi,

The one thing that doesn't seem to quite ring a bell with what little I
recall about a pure repulsion motor is why the shorted brush pair is at
90 degrees to each other and not 180 degrees as I would have
thought.....there's an answer there thats escaping me also.

It's a four-pole motor, so the 90 degrees isn't surprising, but I
would have expected four brushes. Probably has to do with the way the
armature is wound.

Thats what I initially thought Alan and tried.....seems all I got was a
heavy current draw and no rotation....

You had it running on 120V; what happens if you apply 240V with the
same series connections?

Alan

 

[NSM]

"GS" <skiffingNOSPAM@nbnet.nb.ca> wrote in message
news:41E00CEB.2030700@nbnet.nb.ca...
| Howdy all....Have been asked to wire up an old 1hp 115/230VAC repulsion
| motor for the higher voltage with a desired rotation. This is digging
| back a little far into the memory bank for me ...

I'd go to the public library and look for an Audel's book or similar on
these.

http://www.airraidsirens.com/tech_motors.html might help also.

N

 

[NSM]

<alanh_27@yahoo.com> wrote in message
news:1105206130.373696.253970@c13g2000cwb.googlegroups.com...
| cable lacing... a lost art.
|
| Is there anything that a laced cable-bundle does better than a
| tie-wrapped cable-bundle?

Don't overlook spiral wrapping.

N

 

[Floyd L. Davidson]

Matt Whiting <whiting@chilitech.net> wrote:

alanh_27@yahoo.com wrote:

cable lacing... a lost art.
Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?


I think it looks nicer, but functionally I don't believe there
is any difference. Both methods keep the wires neat and
organized.

That is true... *if* both are done correctly.

However, the usual poor job of lacing will have few if any
negative effects, while a poor job of using tie-wraps can
1) put crimps in the cables, 2) literally break wires, and
3) leave some very sharp edges that can slice up hands that
handle the bundle years into the future.

Hence, if the craftperson knows what they're doing... lacing is
pretty and tie-wrapping is easy. If they don't really know the
difference, lacing is safer.

--
Floyd L. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@barrow.com

 

[Blueskies]

<alanh_27@yahoo.com> wrote in message news:1105206130.373696.253970@c13g2000cwb.googlegroups.com...

cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?

Less cut knuckles.

Less expensive?

Lighter?

 

[Alan Douglas]

Hi,
I've been re-reading your last post:

Trying the windings in parallel
(briefly touching power) showed no attempt at torque and just high
current (windings were same resistance.....and no short to case etc).
Reversing the phase (as I indicated) of either winding also produced
just a heavy current draw and very little torque

and I'm puzzled. You mean that neither parallel connection worked?
You're sure? I agree with Sam that you may already have it wired for
230V.

Thinking a bit more about the 90-degree brushes, I wonder if your
commutator has shorting connections between opposite segments?
Who is the maker, out of curiosity? Master used to make repulsion
motors, as I recall.

Alan

 

[Matt Whiting]

Phil wrote:

"w_tom" <w_tom1@hotmail.com> wrote in message
news:41E02BAE.B94304EF@hotmail.com...

Lacing (if it really a nylon laced tube) protects wires from
failure due to constant vibration (ie automotive). Also the
lacing can hold cable together over long distances without
compressing insulation too tightly at the nylon ty wrapped.
Missing information is the environment for that cable. Looks
really have little to due with why things are done.
Furthermore, sometimes a better looking (cleaner) installation
can make things electrically worse.

alanh_27@yahoo.com wrote:

cable lacing... a lost art.

Is there anything that a laced cable-bundle does better than a
tie-wrapped cable-bundle?


Tie-wrapping can also turn a bundle of RF cables into a bundle of RF
filters!

How is tie wrapping any worse than lacing in this regard?

Matt

 

[NSM]

<tedkaz24@hotmail.com> wrote in message
news:1105217596.991559.62610@c13g2000cwb.googlegroups.com...
|
| tedkaz24@hotmail.com wrote:
| > My 18 year old 27" Sony bought the farm, but it has a nice
| > wood cabinet. I'd like to pull the tube and circuit cards and
| > make a book case out of the wood cabinet. Any hints or cautions?
| > Ted Kaz
|
| Wow, this is the biggest flame war I've ever started. All I was
| looking for was secret screws and nuts to look for, and the
| weight of the tube.

Makes ya laugh, don't it?

N

 

[w_tom]

Ty wrap, for example, a coaxial cable. Now wire's
characteristic impedance is changed where ty wrap pressure has
changed dimensions of cable.

Matt Whiting wrote:

How is tie wrapping any worse than lacing in this regard?

Matt

 

[Phil]

Matt Whiting wrote:
How is tie wrapping any worse than lacing in this regard?

Matt

"w_tom" <w_tom1@hotmail.com> wrote in message
news:41E050E6.DD043B57@hotmail.com...

Ty wrap, for example, a coaxial cable. Now wire's
characteristic impedance is changed where ty wrap pressure has
changed dimensions of cable.

That is the answer indeed.



Applying tie wraps on a coaxial cable with a copper braid - even without
exaggerating the pressure - precisely every 20 cm or so over tens of meters
makes great filters.



I suppose lacing allows a milder treatment for RF cables.



Phil

 

[target]

i have a philips fwr7r3 701 the problem is when i turn on the radio he go
off after 1 or two minute where is the solution?