La San Marco 85 / S-E Serie Modo De Empleo Y Mantenimiento página 36

PROBLEM
10. The machine feeds water
from one serving
although the serving has
not been selected.
11. 85 S models: one unit
serves water continuously.
12. The steamer discharges
only small quantities of
steam or water droplets.
13. Small drops flow out of the
water tap.
14. The unit emits a whistle
after serving the coffee.
15. The filter cup comes off the
serving unit.
16. When coffee is being served,
some of it drips out of the
edge of the filter cup.
17. Water leaking from the
drain of the serving unit
solenoid.
18. Light cream (the coffee
flows out of the spout
rapidly).
19. Dark cream (the coffee
drips out of the spout).
20. Presence of grounds in cof-
fee cup.
21. Coffee with too little cream
in cup (spurts out of spout).
22. The cream in the cup is too
thin (it disappears after a
few seconds).
23. Presence of depressions in
the coffee grounds (looking
inside the filter cup).
CAUSE
unit tinuously.
erly connected.
valve.
cup.
cup.
Malfunctioning unit solenoid.
system.
a. Coarse grinding.
b. Low pressing pressure.
c. Small quantity of ground cof-
fee.
d. Water temperature below 90°C.
e. Pump pressure above 9 bar.
f. Sprinkler filter on unit clogged.
g. Filter holes widened (filter cup).
a. Fine grinding.
b. High pressing pressure.
c. Large quantity of ground coffee.
d. High percolation water tem-
perature.
e. Pump pressure below 9 bar.
f. Sprinkler filter on unit clogged.
g. Filter holes clogged (filter cup).
a. Coffee ground too fine.
b. Worn grinders in grinder-dis-
penser unit.
c. Pump pressure above 9 bar.
d. Sprinkler filter on unit clogged.
e. Filter holes widened (filter cup).
clogged.
time due to clogged filter.
to clogged sprinkler filter.
for the fiter used.
SOLUTION
- Short-circuited control unit relay.
-
(see wiring diagram).
replace it.
necessary replace it. Calibrate the
valve at 12 bar.
Calibrate the pump at 9 bar.
Clean the serving unit and the filter cup.
cup.
and clean the solenoid.
rings inside the unit.
a. Finer grinding.
b. Increase the pressure.
c. Increase the quantity of ground coffee.
d. Increase the pressure in the boiler.
e. Decrease the pump pressure.
f. Check and clean with blind filter or
replace.
g. Check and replace the filter.
a. Coarser grinding.
b. Reduce the pressure.
c. Decrease the quantity of ground coffee.
d. Decrease the boiler pressure.
e. Increase the pump pressure.
f. Check and clean with blind filter or
replace.
g. Check and replace the filter.
a. Coarser grinding.
b. Replace the grinders.
c. Decrease the pump pressure.
d. Check and clean with blind filter or
replace.
e. Check and replace filter.
replace.
fee.
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