OT:Kenmore range display diming?

[Joerg]

[1] except that NORITAKE has EOLd the glass. We just did a PC board
that uses an Atmel processor and an LCD, as a drop-in for the old VF
display board. It intercepts the SPI 16-segment+grid drive scan,
converts back to ASCII, and drives the LCD. Nuisance, but avoids
bashing the code on a bunch of products. Pity... the VFs looked great.

Did you check teh competition?
http://www.maxim-ic.com/app-notes/index.mvp/id/1154

Noritake used to be great- local office, great service etc. 8-(

From this thread I gather that there are concern. John wrote EOL, you
write "used to be". Are they throttling back something?

 

[Spehro Pefhany]

On a sunny day (Wed, 29 Sep 2010 11:11:34 -0700) it happened John Larkin
<[email protected]>:

[1] except that NORITAKE has EOLd the glass. We just did a PC board
that uses an Atmel processor and an LCD, as a drop-in for the old VF
display board. It intercepts the SPI 16-segment+grid drive scan,
converts back to ASCII, and drives the LCD. Nuisance, but avoids
bashing the code on a bunch of products. Pity... the VFs looked great.
Did you check teh competition?
http://www.maxim-ic.com/app-notes/index.mvp/id/1154

Noritake used to be great- local office, great service etc. 8-(

From this thread I gather that there are concern. John wrote EOL, you
write "used to be". Are they throttling back something?

They closed their local office and moved everything back to Chicago to
save money with cheap labor. ;-)

 

[Hammy]

One possibility, if a VFD, is that charge has built up on the
glass and attracted a lot of dust to cover the actual display
unit. If you can get it apart, then it may just need simple
cleaning. I have seen this on some units used in dusty
conditions. Presumably the range gets a lot of fumes from
cooking.

Jon

I did pull out the display and clean it. There are no visible signs of
damage, mind you that doesn't mean anything if a cap is drying out it
wouldn't show anyways.

It seems to have two Pcb's press fit and notched to the back of the
display one on top of the other. One of those things were if you try to
take the pcb out you are likely going to damage the whole thing. So I
made a command decision to use it until it is completely unreadable
then try to disassemble and replace the cap. That and I'm to dam lazy
to disassemble half the stove to change a cap right now ;-)

Is it typical for VFD's to only dim in one area or do they usually fade
uniformly?
I'm asking because the clock part is fine it's just the top right
corner where the temp is displayed in orange whereas the clock is
green.

 

[Grant]

One possibility, if a VFD, is that charge has built up on the glass and
attracted a lot of dust to cover the actual display unit. If you can
get it apart, then it may just need simple cleaning. I have seen this
on some units used in dusty conditions. Presumably the range gets a lot
of fumes from cooking.

Dunno about that. The VFD segments, from a microwave made in 1883 I
dismantled recently, showed a browning or dulling of the most used time
digits, suggesting the phosphor degrades over time, like the CRT TVs do.

Actual cause of the microwave's demise was that the controls became
erratic and the processor was sometimes going silly. Quite solidly
built, made in Japan.

Grant.

 

[Grant]

I did pull out the display and clean it. There are no visible signs of
damage, mind you that doesn't mean anything if a cap is drying out it
wouldn't show anyways.

It seems to have two Pcb's press fit and notched to the back of the
display one on top of the other. One of those things were if you try to
take the pcb out you are likely going to damage the whole thing. So I
made a command decision to use it until it is completely unreadable
then try to disassemble and replace the cap. That and I'm to dam lazy
to disassemble half the stove to change a cap right now ;-)

Is it typical for VFD's to only dim in one area or do they usually fade
uniformly?
I'm asking because the clock part is fine it's just the top right
corner where the temp is displayed in orange whereas the clock is
green.

Unless the grid digit select is leaking away for top right? They work
like valves (tubes) common cathode is the heated horizontal wires, grid
to select which 'digit', anodes for the segment pattern under each grid.

Something like that.

Grant.

 

[Spehro Pefhany]

Dunno about that. The VFD segments, from a microwave made in 1883 I
dismantled recently, showed a browning or dulling of the most used time
digits, suggesting the phosphor degrades over time, like the CRT TVs do.

Actual cause of the microwave's demise was that the controls became
erratic and the processor was sometimes going silly. Quite solidly
built, made in Japan.

Grant.

Sounds like quite a valuable antique. Steam powered?




Best regards,
Spehro Pefhany

 

[Grant]

Sounds like quite a valuable antique. Steam powered?

Mostly binned, I just wanted the transformer out of it, either make
something evil with the high voltage, or cut that out and put in a few turns
heavy wire for a small spot welder... Dunno. Lotsa stuff is just ideas in
my head, some will make to reality one day.

Grant.

 

[Spehro Pefhany]

Wow, way ahead they were

Meiji Restoration period. Not as rare as Edo era microwaves. ;-)

 

[ehsjr]

Sounds like quite a valuable antique. Steam powered?

LOL. They don't make them like they used to, way back then.

Ed

 

[Grant]

Meiji Restoration period. Not as rare as Edo era microwaves. ;-)

Slow?! Only now do I see the date typo So glad you're enjoying it.

Grant.