Programming The Grinding Time (Automatic Models); Grinding Adjustment; Changing The Coffee Grinders - SAN MARCO SM serie Handbuch

4.3 Programming the grinding time (Automatic models)

The electronic control unit controls the grinding time and restarts the grinder-dispenser after a certain num-
ber of batches of ground coffee are dispensed. The unit is programmed by the manufacturer according to
preset values (see table).
BATCHES OF
GRINDING
MODEL
TIME
SM 90/95 A 80 s
stops at the end of the preset grinding time or, as already mentioned, it is stopped by the action of the over-
flow limit switch. The installer can modify the settings on the electronic control unit if the user of the appli-
ance requests different parameters from those preset by the manufacturer.
Instructions for a proper adjustment of the grinding time:
• Disconnect the power supply.
• Lean the grinder-dispenser on one side and remove the bottom; the electronic control unit, which con-
trols the grinding time, is located inside the grinder-dispenser.
• Set, in agreement with the user of the appliance, the grinding time and the number of impulses to
start/stop grinding.
• To set the agreed parameters, adjust the dip switches located inside the electronic control unit (see fig-
ure). Dip switches 1 and 2 control the grinding time; it is possible to set a grinding time from 30 to 120
seconds. Dip switches 3 and 4 control the impulses given by the coffee dispensing lever; it is possible to
restart the grinder-dispenser after 6, 12, 18 or 24 batches dispensed.
DIP SW
DIP SW1
CONFIGURATION
ON
Off
OF
ON
On
OF
ON
Off
OF
ON
On
OF

4.4 Grinding adjustment

Instructions for a proper adjustment:
• Fill the hopper 3 with the coffee beans and open the gate 5.
• Start the grinder-dispenser by pressing the main switch 2. Grind a small amount of coffee and switch off the unit.
• Check the fineness of the ground coffee. Make one or more cups of espresso coffee and check the cof-
fee served into the cup (the "ideal" quantity for brewing a cup of espresso is 6 to 8 grams of ground cof-
fee, with a time of 25 to 35 seconds). There may be three different cases:
a) The coffee brews too slowly: the coffee is ground too fine (it should be coarser). To make a coarser
grind, press the release button 8 and turn the adjustment ring 7 clockwise.
b) The coffee brews too fast: the coffee is ground too coarse (it should be finer). To make a finer grind,
press the release button 8 and turn the adjustment ring 7 counterclockwise.
c) The coffee brews at the proper speed.

4.5 Changing the coffee grinders

The proper grinder change procedure is as follows:
1. Loosen the hopper locking screw (1) completely and pull out the hopper.
2. While keeping the release button (2) pressed, turn the adjusting ring clockwise to unscrew the upper
grinder support and remove it from its seat.
3. Replace the grinders and align the lower grinder with the three scraping teeth (the distance from these
teeth is 0,9 mm; to centre the machine we suggest using a thickness gauge).
20
The grinder-dispenser, started with the main switch 2, remains active
GROUND
and stops at the end of the preset grinding time or is stopped by the
COFFEE
action of the overflow limit switch, which resets the timer. The
grinder-dispenser starts again after a certain number of batches of
12
ground coffee, based on the impulses given by the lever 13, and
DIP SW2 TIME
Off 30 s
Off 50 s
On 80 s
On 120 s
DIP SW
DIP SW3
CONFIGURATION
ON
Off
OF
ON
On
OF
ON
Off
OF
ON
On
OF
DIP SW4 BATCHES
Off 6
Off 12
On 18
On 24