Hobbyist adventures in electronics, mostly related to salvaging and tinkering with disparate parts found here and there (but also some "new" creations, mostly related to Arduino).
There will likely be a shared structure for the entries: a description of the salvaged part, a couple of pictures, the schematics and a circuit simulation with QUCS. Usually I will run the simulation in order to (better) understand the behavior or theory of some parts of the circuit.
Level: close to a novice...
viernes, 27 de abril de 2018
Coffe Machine Philips HD 5670/A
This seems to be a "mildly old" coffee machine: it
has been at my family's home for perhaps 20 years, and I could not find
anything on it at internet (besides a complain on a second-hand unit).
It is a bulky unit (almost 30*30*15 cm), which does not use
capsules (too modern!): it is a conventional, manual espresso machine. It
requires that the granulated and toasted coffee is placed on a cup which is
then placed against the steam outlet or grouphead. It also has a separated hot steam supply (the steam wand) for heating the milk (or the water).
The machine has mechanical, hydraulic and electrical parts,
in three main systems:
- A pump, which receives (sucks) the water from the water
tank and pumps it into a boiler.
- A boiler, which creates pressurized hot steam.
- The electrical controls, with sensors and switches on the
Besides its very simple control, operation-wise is similar to other
coffee machine that I described here.
The electrical part is very simple, as indicated in the
The operation is straight: switch S0 starts the machine
on/off and the heating resistor (R1), while switch S1 sets the pump in
operation (M1), creating the flow of steam. Switch S2 is in parallel to one of
the thermal sensors in the boiler (TH4), so it bypasses its function with a
kick of additional steam.
The light RD1 (red) is on as soon as the machine is
connected (S0), and the light OR1 (orange) is on when the heating resistor is
The pump is model CS M3637 from Eaton, Mod CP2, with a power
of 70 W working at 25-60ºC. It is of the vibrating or solenoid type, described
in another post. (Eaton is a giant, and it seems they do not manufacture these pumps anymore; there are a number of internet sites on these pumps and spares: one example here). It is mounted on rubber pads, and it is protected with a thermal fuse
(Microtemp 4204A ZKAFZ 98 C; TH2) attached to the body of the pump. (Here
on the operation and coding of these thermal fuses, although this one seems to
Made in, in two pieces, bolted (th boiler in aluminium, the grouphead in inox). There is no mark on
it. It has a release valve, manually regulated for the steam wand.
The heating resistor (R1) has approx. 43 ohm, which yields a power
of some 1,150 W at 220 V (rated 1,260 W).
There are three temperature sensors in contact with the
body: two switches from Campini TY60 T180 (TH3 and TH4), and one thermal fuse Microtemp
4300A ZHAHG 152 C (TH1). (I'm curious about the two thermal switches and the temperature distribution in the boiler, but I have not yet a thermal camera!)
on the operation and coding of the thermal fuse, although this one also seems to be
older; and here
on the specifications of the Campini thermostat switch (“single pole thermostat
with snap-action disc”).
The three switches are mechanical, of the push type,
normally open, with one pole. The manufacturer is ROLD, series CM. S0 and S1
are model E1026 A1 (they retain the closed position when pushed); Switch S2 is
model E2015 A1 (does not retain the position when pushed).
ROLD is an Italian manufacturer, a “leader in the
manufacture of components for household appliances”. Their webpage does not have catalogues.