Schaerer Ambiente 2 Service Manual

Chapter 6 Control system diagram
SMSO-2-02.06- 15.07.03 207
6.5.21 Rotary-vane type pump, motor
36V 5V DC

36V S

L1, N
Operating condition
When the voltage supply is functioning correctly, the rotary vane type pump operates for a certain period for all product serv-
ings.
Symptoms
The rotary vane type pump motor is not functioning.
Procedure
Process
step
Check Possible cause Remedy
1
Take voltage measurement at the
connection terminals to the ma-
chine:
L1, N:
Mains voltage ?
 Check the mains connection (see
“mains connection”)
 Fault in mains connection
2
Measure voltage at power PCB
input at control fuse F1:
Input (top), N
Mains voltage ?
Output (bottom), N
Mains voltage ?
 Cable broken or pulled out of
terminal / plug
 Plug contacts on power PCB
(input) faulty / oxidised
 F1 fuse faulty
 Replace cable or reinsert it into
the terminal
 Check / replace the plug contacts/
cable
 Replace fuse F1
3
Carry out initial test:
Take voltage measurement at the
terminals to the motor cable:
Mains voltage ?
 Plug contacts on power PCB
(output) faulty / oxidised
 Cable broken or pulled out of
terminal / plug
 Relay 3 faulty
 Check / replace the plug contacts/
cable
 Replace cable or reinsert it into
the terminal
 Replace the power PCB
Capacitors can be tested only on special measurement instruments.
The capacitor on the motor causes a rotary field to generate in the stator coil. If the capacitor is faulty, the motor makes
a “buzzing” noise and becomes hot, but the motor shaft (pump) does not rotate.
Resistance measurements etc. are not meaningful and thus pointless.
4
The motor buzzes but the shaft
does not rotate:
 Faulty capacitor
 Motor / pump mechanically blo-
cked
 Replace the capacitor
 Test the motor/pump individually;
replace faulty components (see
section 5)
NO
YES
NO
NO
YES
NO
YES

Schaerer Ambiente 2 Specifications

General

Brand	Schaerer
Model	Ambiente 2
Category	Coffee Maker
Language	English