Epson 740 Micro switch

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Archived from groups: comp.periphs.printers (More info?)

Hello

I got today a defekt Epson Stylus color 740 from a friend.
If you switch it on there is some noise and head moving (normal),
then the head goes to right in normal positionan the LED for no black ink is
on. If you press the paper feed button or the clean button for a few
seconds to put a new cartridge in the head goes left and the green power
on LED is flashing.
After putting the new cartridge in and close the clamp it happens nothing.
Red light is still on, head is not moving, even after pressing the clean
button. To get the head in normal position at right side you have
to switch out the printer. After switching on again green power on light
is on (not flashing) and red no black ink light is on.
I read that there is a micro switch in the tray, to tell the printer,
that there is a new full cartridge in the tray. But I could not find it,
only a cable with 3 wires at the front side and the left side of the
tray. Is it possible, that the switch is defekt or cemented with ink for
example and the printer does not knows that the clamp is closed?
If the clamp is closed is the switch on or off?
Can I repair this?
Or is it possible to cut the cable and shortcut manually the wires to
simulate a closed switch.
Is the cable for both micro switches (black and color cartridge)?
Are there some manuals or drawings to do such a repair?
(to get the tray out of the printer and to dissassemble it)

tschuess,
Otto

 

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Archived from groups: comp.periphs.printers (More info?)

In article <dapnth$kuc$01$1@news.t-online.com>, Otto Haerter
<ohaerter@web.de> wrote:

> I got today a defekt Epson Stylus color 740 from a friend.
> If you switch it on there is some noise and head moving (normal),
> then the head goes to right in normal positionan the LED for no black ink is
> on. If you press the paper feed button or the clean button for a few
> seconds to put a new cartridge in the head goes left and the green power
> on LED is flashing.
> After putting the new cartridge in and close the clamp it happens nothing.
> Red light is still on, head is not moving, even after pressing the clean
> button. To get the head in normal position at right side you have
> to switch out the printer. After switching on again green power on light
> is on (not flashing) and red no black ink light is on.

Otto-

It is possible that the micro switch is working, but the electrical
contacts on the cartridge are gummed-up and not making contact.

Perhaps your friend forgot to remove the tape that covers the electrical
contacts, and it stuck to the inside of the printer, covering the contacts
there. If it is something this simple, it should be a lot easier to fix
than replacing a switch!

Remove the cartridge and look at its contacts and the contacts in the
printer. If they look clean, then they are probably not the problem. You
might clean them with a pencil eraser to be sure. If you see something
like plastic film or tape covering the contacts, that is where the trouble
is.

Fred

 

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Archived from groups: comp.periphs.printers (More info?)

Fred McKenzie schrieb:
> In article <dapnth$kuc$01$1@news.t-online.com>, Otto Haerter
> <ohaerter@web.de> wrote:
>
>

Hello Fred

There are no electrical contacts at the cartridge.
I pulled out the the color cartridge.
In the color tray there is also a little plastic arm going down if you
insert the cartidge an rotates a "Achse" (in german) and the achse
serves the micro switch. If I put the pastic arm down in color tray the
red light (for no color ink)gets off, if I do the same at black tray
there happens nothing so I am sure, that the micro switch for black ink
is responsible for the failure.
But I cannot see the way to dissasemble the tray.

tschuess,
Otto
>
> It is possible that the micro switch is working, but the electrical
> contacts on the cartridge are gummed-up and not making contact.
>
> Perhaps your friend forgot to remove the tape that covers the electrical
> contacts, and it stuck to the inside of the printer, covering the contacts
> there. If it is something this simple, it should be a lot easier to fix
> than replacing a switch!
>
> Remove the cartridge and look at its contacts and the contacts in the
> printer. If they look clean, then they are probably not the problem. You
> might clean them with a pencil eraser to be sure. If you see something
> like plastic film or tape covering the contacts, that is where the trouble
> is.
>
> Fred

 

[Guest]

Archived from groups: comp.periphs.printers (More info?)

If I recall correctly, the 740 doesn't have either a chip with contacts,
or tape on any contacts.

The likely cause is the leaf spring that is either in front of or behind
the area the cartridge is installed, has become fatigued or flattened.
You need to carefully "peak" the middle of that leaf spring to make it
activate again with the surface of the cartridge shell when the
cartridge is installed.

That leaf spring needs to break contact and then reestablish contact (or
vice versa) to acknowledge a new cartridge is installed. If the leaf
spring is too flat, it doesn't move enough to break contact, so the
printer will not acknowledge the cartridge removal and
reinsertion/replacement.

By the way, on the 740, the printer has no idea if you put a new,
refilled, used, empty, or even the same cartridge back in, there is not
chip to read on the cartridge.

Art

Fred McKenzie wrote:

> In article <dapnth$kuc$01$1@news.t-online.com>, Otto Haerter
> <ohaerter@web.de> wrote:
>
>
>>I got today a defekt Epson Stylus color 740 from a friend.
>>If you switch it on there is some noise and head moving (normal),
>>then the head goes to right in normal positionan the LED for no black ink is
>>on. If you press the paper feed button or the clean button for a few
>>seconds to put a new cartridge in the head goes left and the green power
>>on LED is flashing.
>>After putting the new cartridge in and close the clamp it happens nothing.
>>Red light is still on, head is not moving, even after pressing the clean
>>button. To get the head in normal position at right side you have
>>to switch out the printer. After switching on again green power on light
>>is on (not flashing) and red no black ink light is on.
>
>
> Otto-
>
> It is possible that the micro switch is working, but the electrical
> contacts on the cartridge are gummed-up and not making contact.
>
> Perhaps your friend forgot to remove the tape that covers the electrical
> contacts, and it stuck to the inside of the printer, covering the contacts
> there. If it is something this simple, it should be a lot easier to fix
> than replacing a switch!
>
> Remove the cartridge and look at its contacts and the contacts in the
> printer. If they look clean, then they are probably not the problem. You
> might clean them with a pencil eraser to be sure. If you see something
> like plastic film or tape covering the contacts, that is where the trouble
> is.
>
> Fred