Asko D1976, Service Manual

Page: 27 / 28

Model D1976
(DW 955)
Page
Date
2000-06
25
SERVICE INFORMATION
Product: DW95 Date: 98-03-13
TOPIC: CONTROL UNIT FAILURE ANALYSIS
To prevent repeated exchanges of control units due to failures in auxiliary components (circulation pumps,
inlet valves, etc.), a simple check on the control unit should be done to determine what cause the failure.
If any of the control unit components listed below or the conductive pattern (copper foil on the soldering
side) near these components are damaged, most likely the external component caused the failure and
should be ohm-measured. In the case of short-circuits, the components should be exchanged along with
the control unit.
External Component Associated Output Components
Heater K1, PF2
Drain pump K2, P1 5
Circulation pump K3, P1 3
Inlet valve 1 Q13, R36, R52, D22, D24, P1 7
Inlet valve 2 Q6, R43, R55, D26, D27, P1 8
Combi-dispenser Q12, R50, R58, D21, D23, P2 3
Fan and wax motor Q16, R46, R56, D18, D19, P3 3
Interior light P4 3 (after 9740, the lamp is not connected to the control unit.)
K=Relay
Q=Triac
R=Resistor
D=Diode
P=Connector
Note: Once the was motor has dried out, it is not possible to measure for faults. Remove the wax
motor and check for burn marks. For complete certainty, replace the wax motor.