Repair work at the outer door
6.2.3
Checking and replacing the interior side of the outer door
Spare parts:
Inner door (interior side of the outer door) KBF 115
order no. 8003-0181
Inner door (interior side of the outer door) KBF 240
order no. 8003-0181
Inner door (interior side of the outer door) KBF 720, right
order no. 8003-0184
Inner door (interior side of the outer door) KBF 720, left
order no. 8003-0183
Necessary tools: Crosstip screwdriver, size 2
1.
Disconnect the unit from the power supply.
2.
Remove the housing cover at the lower front (chap. 5.1).
3.
Pull the electric mounting plate (A) towards the front out of the unit (chap. 5.1).
Checking the door heat conductor (-4E2):
4.
Disconnect the contactor (-
X50
), which is locat-
ed behind the electric mounting plate. Use a
multimeter to measure the resistance of the
door heat conductor between pins 1 and 4 of the
contactor (-
X70
). If R
measured
= 240
Ω
± 10 %,
the door heat conductor is OK. If R
measured
≠
240
Ω
± 10 %, the door heat conductor is defec-
tive and the interior side of the outer door must
be replaced (chap. 6.2.1).
1
2
3
4
5
6
Figure 10: Pin configuration (-X70)
Checking the temperature sensor (-3B3):
5.
Pull the wires of the door Pt100 temperature sensor out of the terminal strips (
E2- Pt100
) of the con-
troller MB1 I/O-board (
-3N2
) (see wiring diagram and chap. 8.8). To test the temperature sensor, use a
multimeter to measure the resistance between one of the red wires and the white wire.
6.
Use the following table to determine the temperature value corresponding to the measured resistance.
Compare this temperature value with the temperature measured with a reference thermometer, which
measures the temperature on the interior side of the outer door. If the temperature values vary by
more than 5°C, the temperature sensor is defective. In this case the interior side of the outer door must
be replaced. If the temperature deviation is < 5°C, perform an adjustment (chap. 11).
7.
Remove the connecting cable of the door heat conductor (
-4E2
) and of the temperature sensor (
-3B3
)
on the electric mounting plate.
8.
Demount the interior side of the outer door (chap. 6.2.1).
9.
Remove the door hinge cover (chap. 6.2.2).
10.
Pull all cables of the interior side of the door carefully through the hinge ports of the door frame out of
the machine room.
11.
Mount the interior side of the outer door by following steps 1 to 8 in reverse order.
46
Service Manual KBF (E5.2) 04-2015