Schaerer Ambiente 2 Service Manual

Chapter 6 Control system diagram
224 SMSO-2-02.06- 15.07.03
6.5.36 Refrigerator, solenoid valve for squeeze cylinder
(Hotflush)
02.04.2002 .........
Serial no. 505124 .........
36V 5V DC

36V S L1, N
Operating condition
The pinch valve (open at zero current) closes the suction pipe to the milk container during the rinsing process.
Symptoms
The pinch valve is not functioning.
Procedure
Process
step
Check Possible cause Remedy
1
Measure voltage at plug X40 5 on
power PCB:
36 V DC ?
 Check the voltage supply (see
“Power PCB, control voltage”)
 Voltage supply failure / faulty
2
Measure voltage at plug-in con-
nection (6) between machine and
refrigerator (interface)
36 V DC ?
 Plug contacts on power PCB
faulty / oxidised
 Cable broken or pulled out of plug
 Check / replace plug contacts
 Replace cable
3
Voltage measurement on the
connector tongue (Input) to the
pinch valve:
36 V DC ?
 Plug contacts on power PCB
faulty / oxidised
 Cable broken or pulled out of plug
 Flat plug not correctly connected
 Check / replace plug contacts
 Replace cable
 Re-connect the flat plug on the
plug-in contact stud
Resistance measurement at pinch valve:
 Switch off voltage
 Pull out cable from plug-in contact studs
4
Resistance measurement at pinch
valve;
Nominal resistance:
48 Ω ?
 Plug in contact studs oxidised
 Faulty coil
 Replace pinch valve
5
Voltage measurement X40 6,
GND
0 V DC ?
 Power transistor does not switch  Replace the power PCB
Reconnect the flat plug to the
pinch valve.
Function check: The valve must
open (audible click!)
 Cable (gr) / power PCB faulty
 Mechanical fault on pinch valve
(calcium deposit)
 Replace cable / power PCB
 Replace pinch valve
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO

Schaerer Ambiente 2 Specifications

General

Brand	Schaerer
Model	Ambiente 2
Category	Coffee Maker
Language	English