Read Sharp R-465 (serv.man9) Service Manual online
R-465(SL)
5
FUNCTION OF IMPORTANT COMPONENTS
THERMAL CUT-OUT (OVEN)
The thermal cut-out, located on the top of the oven cavity,
is designed to prevent damage to the oven by fire. If the
foods load is overcooked, by either error in cook time or
defect in the control unit, the thermal cut-out will open.
Under normal operation, the oven thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the oven thermal cut-out
will open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
is designed to prevent damage to the oven by fire. If the
foods load is overcooked, by either error in cook time or
defect in the control unit, the thermal cut-out will open.
Under normal operation, the oven thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the oven thermal cut-out
will open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
THERMAL CUT-OUT (MAGNETRON)
The thermal cut-out located near the magnetron is de-
signed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the magnetron, the thermal cut-out will
open at 125˚C causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
signed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the magnetron, the thermal cut-out will
open at 125˚C causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
THERMOSTAT 150˚C IN HIGH VOLTAGE TRANS-
FORMER
FORMER
The thermostat protects the high voltage transformer
against over heating. If the temperature goes up higher
than 150˚C because the fan motor is interrupted or the
ventilation openings are blocked, the thermostat will cycle,
line voltage to the high voltage transformer will also cycle.
(If operated, check the magnetron for damage.)
against over heating. If the temperature goes up higher
than 150˚C because the fan motor is interrupted or the
ventilation openings are blocked, the thermostat will cycle,
line voltage to the high voltage transformer will also cycle.
(If operated, check the magnetron for damage.)
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to
rotate the turntable.
rotate the turntable.
FAN MOTOR
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vents surrounding
the magnetron and cools the magnetron. This air is
channeled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then ex-
hausted through the exhausting air vents at the oven
cavity
This cool air is directed through the air vents surrounding
the magnetron and cools the magnetron. This air is
channeled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then ex-
hausted through the exhausting air vents at the oven
cavity
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
that might flow back in the power circuit.
DOOR OPEN MECHANISM
The door is opened by pulling the door, refer to the Figure
D-1.
D-1.
Figure D-1. Door Open Mechanism
1ST. INTERLOCK SWITCH AND 2ND. INTERLOCK
RELAY CONTROL SWITCH
RELAY CONTROL SWITCH
1. When the oven door is closed, the contacts (COM-NO)
must be closed.
2. When the oven door is opened, the contacts (COM-
NO) must be opened.
MONITOR SWITCH
1. When the oven door is closed, the contacts (COM-NC)
must be opened.
2. When the oven door is opened, the contacts (COM-
NC) must be closed.
3. If the oven door is opened and the contacts (COM-NO)
of the 1st. interlock switch and the relay RY1 fail to
open, the fuse F10A blows simultaneously with closing
the contacts (COM-NC) of the monitor switch.
open, the fuse F10A blows simultaneously with closing
the contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE
F10A TEST THE 1ST. INTERLOCK SWITCH,
RELAY RY1, MONITOR SWITCH AND
MONITOR RESISTOR FOR PROPER OP-
ERATION.
RELAY RY1, MONITOR SWITCH AND
MONITOR RESISTOR FOR PROPER OP-
ERATION.
MONITOR RESISTOR 0.8
Ω
20W
The monitor resistor prevents the fuse F10A bursting
when the fuse F10A blows due to the operation of the
monitor switch.
when the fuse F10A blows due to the operation of the
monitor switch.
HIGH VOLTAGE FUSE
The high voltage fuse blows when the high voltage rectifier
or magnetron is shorted.
or magnetron is shorted.
FUSE F10A
1. The fuse F10A blows when the contacts (COM-NO) of
the 1st. interlock switch and the relay RY1 remain
closed with the oven door open and when the monitor
switch closes.
closed with the oven door open and when the monitor
switch closes.
2. If the wire harness or electrical components are short-
circuited, this fuse F10A blows to prevent an electric
shock or fire hazard.
shock or fire hazard.
Latch
Heads
Heads
Door
Latch Hook
2nd. Interlock
Relay Control
Switch
Relay Control
Switch
1st. Interlock
Switch
Switch
Monitor Switch
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