Schaerer Ambiente 2 Service Manual

Chapter 6 Control system diagram
SMSO-2-02.06- 15.07.03 227
6.5.39 Refrigerator, rinsing valve – “milk foam” ......... 01.04.2002
......... Serial no. 505123
36V 5V DC

36V S L1, N
Operating condition
The milk foam rinsing valve is open during the rinsing process (closed at zero current)
Symptoms
The “milk foam rinsing valve” is not functioning.
Procedure
Process
step
Check Possible cause Remedy
1
Measure voltage at plug X40 3 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 (8) 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
"milk foam" rinse 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 “milk foam” rinsing valve:
 Switch off voltage
 Pull out cable from plug-in contact studs
4
Resistance measurement at “milk
foam” rinsing valve;
Nominal resistance:
60 Ω ?
 Plug in contact studs oxidised
 Faulty coil
 Replace rinsing valve
5
Voltage measurement X40 4,
GND
0 V DC ?
 Power transistor does not switch  Replace the power PCB
Reconnect the flat plug to the
“milk foam” rinsing valve.
Function check: The valve must
open (audible click!)
 Cable (gn) / power PCB faulty
 Mechanical fault on rinsing valve
(calcium deposit)
 Replace cable / power PCB
 Replace rinsing valve
NO
YES
YES
NO
YES
NO
Y
ES
NO
Y
ES
NO
NO

Schaerer Ambiente 2 Specifications

General

Brand	Schaerer
Model	Ambiente 2
Category	Coffee Maker
Language	English