Function Of Important Components - Electrolux MCC4060E Service Manual

DOOR OPEN MECHANISM
The door can be opened by pulling the door handle.
Door
SW1:Monitored
latch switch
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH SW1
1. When the oven door is closed, the contacts
(COM-NO) of the switch must be closed.
And the contacts (COM-NC) must be opened.
2. When the oven door is opened, the contacts
(COM-NO) of the switch must be opened.
And the contacts (COM-NC) must be closed.
STOP SWITCH SW2
1. When the oven door is closed, the contacts
(COM-NO) of the switch must be closed.
2. When the oven door is opened, the contacts
(COMNO) of switch must be opened.
MONITOR SWITCH SW3
The monitor switch is activated (the contacts
opened) by the lower latch head on the door while
the door is closed.
The switch is intended to render the oven
inoperative by means of blowing the fuse F2 F8A
when the contacts of the monitored latch switch
SW1 fail to open when the door is opened.
Function
1. When the door is opened, the contacts (COM-NC)
of monitor switch SW3 close (to the ON condition)
due to their being normally closed and contacts
(COM-NO) open. At this time the contacts (COM-
NO) of monitored latch switch SW1 is in the OFF
condition (contacts open) due to their being
normally open contact switches.
2. As the door goes to a closed position, the monitor
switch SW3 contacts (COM-NC) are opened and
contacts (COM-NO) closed and then contacts
(COM-NO) of monitored latch switch SW1 and
stop switch SW2 are closed.(On opening the door,
each of these switches operate inversely.)
SOI 12.06 FV

FUNCTION OF IMPORTANT COMPONENTS

Latch hook
Latch
Heads
Tab
SW2: Stop switch
SW3: Monitor switch
3. If the door is opened and the monitored latch
switch SW1 contacts (COM-NO) fail to open,
the fuse F2 F8A blows immediately after
closing of the monitor switch SW3 (COM-NC)
contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE
SWITCH SW3 FOR PROPER
OPERATION. (REFER TO CHAPTER
"TEST PROCEDURE").
FUSE F1 20A 250V
If the wire harness or electrical components are
shortcircuited, this fuse F1 20A blows to prevent an
electric shock of fire hazard.
FUSE F2 F8A 250V
1. If the wire harness or electrical components are
shortcircuited, this fuse blows to prevent an
electric shock or fire hazard.
2. The fuse also blows when the monitored latch switch
SW1 remains closed with the oven door
open and when the monitor switch SW3 contact
(COM-NC) closes.
3. The fuse also blows when the asymmetric rectifier,
H.V. rectifier,.H.V. wire harness, H.V.
capacitor, magnetron or secondary winding of
high voltage transformer is shorted.
TC TRANSFORMER
T/C transformer converts A.C. line voltage into low
voltage to drive the control unit.
THERMAL CUT-OUT TC1 125°C (MG)
This thermal cut-out protects the magnetron against
overheat. If the temperature goes up higher than 125°C
because the fan motor is interrupted or the ventilation
openings are blocked, the thermal cut-out TC1 will
open and switch off all the electrical parts. The
defective thermal cut-out must be replaced with a new
one.
THERMAL CUT-OUT TC2 170°C (GRILL)
This thermal cut-out protects the oven against the
overheat during grill cooking, convection cooking or
dual cooking. If the temperature rises above 170°C
because the fan motor is interrupted, the air inlet duct
is blocked or the ventilation openings are obstructed,
the thermal cut-out TC2 opens and switches off all the
electrical parts. When the cut-out cools itself down to
the operating temperature of 155°C, the contacts of the
thermal cut-out will close again.
15/43 599 37 42-75