Re: Turn off laser printer with power strip?

I am not speculating. I have repaired laser printers, and indeed, even with "designed" heat removal via fans and heatsinks, parts do overheat and permanently warp. There was one HP early color printer that had a continual problem with this, causing parts of the case to warp and eventually leading to an open door error developing because the case form changed. Several other brands have had similar problems. I do not know of any laser printer manufacturer that suggests regularly turning off the printer after an activity before the unit's cooling fans go off. Power bar switches are 3rd party products and switching a peripheral off in that manner is equivalent to yanking the plug on it,

I have a better question... why do the engineers design there to be cooling fans running on these devices if they want you to turn them off at will?

Inkjet printer companies don't warn you that the printer may suddenly stop working right in the middle of a project and have to be brought in for a EPROM reset and change of the waste ink pads either, you just find out when it happens. Nor do they warn that a clogged head on an inkjet printer that uses a microchipped cartridge may falsely lower the ink level it monitors even though the ink may not be leaving the cartridge at all.

There are millions of things which appliance companies do not "warn" the end user about, because they either don't wish them to know, or they consider the action obtuse or not logical to engage in. Many designs today especially use materials and systems that are designed just within the known tolerances they can work at, and repeatedly pushing beyond that will shorten their lives

Art.


w_tom wrote:

Your speculating - then trying to justify that speculation as fact.
If residual heat caused other damage, then the manufacture would state
that is a problem. Where is that 'speculated problem' stated in the
manuals? Yes, it may be possible for heat to harm some other
component. Fine. Which compnents? Possible heat damage which is why
the manufacturer warns us not to remove power. Ahh... where is that
warning? A damning missing detail.

I have worked on laser printers. Fixing them to better understand
them. I don't see this susceptible component? I don't see these
warnings about not removing power. Where does this fear come from?
Speculation.

Arthur Entlich wrote:

Makes no difference whether power is removed by printer switch, power
strip, or wall switch.

I think your statement above is way too broad. Designs differ
considerably. Many off switches on printers actually do not shut down
the power fully, keeping trickle voltages to keep certain components
operational. Further, many do indeed have delays to allow certain
mechanical parts to be placed in the proper position for rest or
storage, and a power interruption can indeed leave these machines in a
vulnerable state.

Further still, heat build up can indeed still occur and warp or damage
parts if cooling fans are cut off too soon. Fans can be used to
maintain a specific temperature range that can be overshot by a heated
part without air circulation, even if the part is no longer being
supplied with addition energy to maintain its heat.


.

Relevant Pages

  • Re: Turn off laser printer with power strip?
    ... power switch, but some are not. ... that the the fans keep running to ensure that some of that heat is not applied ... laser printer can then be powered down by a switch. ... defective by design. ...
    (comp.periphs.printers)
  • Re: Turn off laser printer with power strip?
    ... The fuser may well be at 200 degrees Celsius and that heat has to go somewhere, I am sure that the the fans keep running to ensure that some of that heat is not applied to components that are not designed to withstand those temperatures without cooling. ... I do not believe that the short period of fan operation after power down is to make the printer safe for people to open since they can open it with power on in nearly all cases, and with many printers can get a slight burn. ... laser printer can then be powered down by a switch. ... defective by design. ...
    (comp.periphs.printers)
  • Re: the throttle
    ... Also heat is the big design ... Heat comes from burning power. ... cost of electricity went up about an order of magnitude. ...
    (comp.lang.forth)
  • Re: the throttle
    ... Also heat is the big design ... Heat comes from burning power. ... cost of electricity went up about an order of magnitude. ...
    (comp.lang.forth)
  • Re: Digital Server 5300 shuts off
    ... Hans Vlems wrote: ... >> Visually inspect all fans. ... > With the top cover off the 5305 won't power up at all. ... > The way Doug describes the problem it is most likely a heat problem. ...
    (comp.sys.dec)