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USER MANUAL
– check condition
Slim Jim User manual
page 26
Check machine condition, report malfunctions
It will help the service technician solving problems if some information about the machine is known
before a house-call is scheduled. This information should include:
1. serial number of the machine
2. free flow rate of each individual group
3. a well-defined description of the malfunction
Free-flowrate
During “free-flow” (no filter holder locked in the group) the flowrate gives an indication of the smallest
orifice in the coffee system of the machine. This would normally be the flat-jet underneath the group-
valve which, depending on individual set-up, has a diameter of 0.6
– 1.0 mm. With such small
openings, even a minor divergence can cause quite a large difference in flowrate. Production
variances of the flat-jets are known to cause a difference in free-flow flowrate and thus
“free-flow shot
time” between groups of up to 10%.
The table below gives an indication of free-flowrates at brew temperature with different flat-jet sizes. If
one or more groups have a free-flowrate that falls outside the range given for that flat-jet it is advised
to have a technician check the machine.
diameter of flat-jet
(mm)
minimum
(ml/minute)
goal
(ml/minute)
maximum
(ml/minute)
0.6
300
400
450
0.8
700
850
925
1.0
1000*
1200*
1300*
Table 2. Showing range of free-flowrates for water of 90-95°C at 9 bar brew pressure for different size
flat-jets.* numbers not checked yet.
Heating element indicator lights
A set of indicator lights is found on the bottom of the electronics box, see Figure 20.
If the machine is warmed up and functioning correctly, the 3 lights on the left (steam boiler) will light up
simultaneously at longer intervals and
“in sync”
2
with the corresponding orange centre line shown on
the control panel. The 2 or 3 lights on the right (coffee boiler heating) will light up shortly at somewhat
erratic intervals but in sync with the corresponding orange centre line on the interface.
If there is a problem with the machine, the indicator lights help to determine possible causes.
Figure 20. The heating element indicator lights on a Slim Jim Triplette, left indicator lights for the
steam boiler, right for the coffee boilers. See also Figure 21.
2
The control panel-display is lagging by about 0.5 seconds w.r.t. the indicator lights.
coffee
steam
gr1
gr2
gr3
lower
middle
upper
electrics tray
GROUP 1
93.4
GROUP 2
45.6
GROUP 3
93.2
STEAM
124.6
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