28 April, 2015

The plotter fails to recognize the cartridge: Repairing a 500-800 HP Designjet 42 "

We had a problem with our plotter; it marked "unrecognized cartridge" error before finishing of each printed plan; when we repositioned the cartridge the problem was solved for a while, but it seemed a problem of poor contact with the cartridge chip (it was produced when the motor axis ink supply was activated).

To repair it, you have to access the module cartridges; first of all we need to remove the cover of Control, it is a matter of finding and removing all the screws, simple task and which information is on the internet, so that I refrain from commenting;)

26 April, 2015

Turn off RadioCD in a Xsara Picasso car: Connection to the burner

We dropped the front screws and side to find the lighter wiring
RadioCD included by factory in the Citroen Xsara Picasso does not disconnected immediately after removing the key, so remains on a couple of minutes after the unit is disconnected.
In this case it is advisable to connect the red wire RadioCD "ON" (not the one going to the battery, but the activator) to positive cable of the burner, and then this hassle is avoided.

15 April, 2015

In Depth: Lexman 9W LED bulb E27 230V 4000K 806 lm of Leroy Merlin

In my case gets 3 years warranty

LED bulbs are already flooding the domestic market, with options for almost every need.

We will analyze in detail a model that sells E27 Leroy Merlin with 3 years warranty brand Lexman  (non-publicizing, just to compare).

This bulb shines very well, with a more than acceptable theoretical efficiency of  90 lumens/W, perfect for replacing incandescent bulbs of 100W  (tested). 
His tone, a clear yellowish 4000º Kelvin, is suitable for everywhere in the house (although it is away from 5600K natural sunlight, colder), and a higher CRI of 80, enough.

If we break the glass we see that the controller gives 94V, feeding 33 LEDS 3528 series (which theoretically receive 2,84V and 0,27W each emitting 24 lm / ud), giving 806 lumens and 9W according to manufacturer (and although I can not measure it, seems to be true from its luminance):

The design to dissipate heat is of lightweight aluminum inside, which contacts the exterior part thermal plastic, that transfer worse the heat than aluminum, so it does not burn and can be touched, but it would be best if it were metal body such as lamps from Ikea, since the chip area after 6 minutes is at 43 ° C with 18ºC environment temp.:

With the (+ - 1 ° C) temperature sensor check infrared LEDs

and reaching 64 ° C! after half an hour, a temperature not very convenient for semiconductors. The manufacturer indicates a lifespan of 15,000 hours, but I hardly trust it, I recommend saving the invoice and not buying this bulbs because, if we use a lot, It will not reach the three years guaranteed!

Anyway, for € 6 per bulb, and for environments such as the bathroom where they are at most one hour on, they are more than recommended. For other uses, best to get better quality lamps.

01 April, 2015

Preparing a ventilated protective mask for Airsoft

Homemade ventilation mask

Eye protection is mandatory in airsoft, but most masks do not have enough ventilation, so you end up with very low vision by condensation on the policarbonate plastic.

As others have done before methe trick is to introduce fresh air with a small fan and battery; I used a fan from a notebook computer, with a small switch and a 18650 lithium battery (4.2V) in the corresponding adapter .