Sharp R-8R51 - Page 19

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PROCEDURE
LETTER
R SRSI1(W)}
BAST B)
TEST PROCEDURES (CONT'D)
COMPONENT TEST
lf incorrect readings are obtained, make the necessary switch adjustment or replace the swilch.
CARRY OUT 4R CHECKS.
TEMPERATURE FUSE OR THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the termtmals of the temp. fuse or thermal cut-out. Then using an
ohmmeter, make a continulty test across the each two terminals as described in the table below.
CARRY OUT 4R CHECKS
Table: Temperature Fuse or Thermal Cut-out Test
Temperature of Temperature of Indication of
“ON” condition “OFF” condition ohmmeter
Parts Name (closed circuit). {open circuit). (When room
(°C) ("C) temperature 1s
approx. 20°C.)
Thermal cut-out
104°C TC1 (FAN) Below -20°C Above 115°C Closed circuit.
Temperature fuse This is not resetable
150°C TC2 (CONV) | type. Above 150°C Closed circult.
a
Temperature fuse This is not resetable
150°C TC3 (OVEN) | type. Above 150°C Closed circuit.
Thermal cut-out
145°C TC4 (MAG) | Below -20°C Above 145°C Closed circuit
lf incorrect readings are obtained, replace the temp. fuse or thermal cut-out.
An open circuit thermal cut-out (TC1) indicates that the fan motor has overheated, this may be
due to resisted ventilation or locked cooling fan.
An
open
circuit
temperature
fuse
(TC2)
indicates
that
the
convection
fan
motor
winding
has
overheated,
this
may
be
due
to resisted
ventilation
or locked
cooling
fan.
An
open
circuit
temperature
fuse
(TC3)
indicates
that
the
oven
has
overheated,
this
may
be
due
to resistricted
ventilation
or
locked
cooling
fan.
An
open
circuit
thermal
cut-out
(TC4)
indicates
that
the
magnetron
has
heated,
this
may
be
due
to
resisted
ventilation,
cooling
fan
failure
or
a
fault
condition
within
the
magnetron
H.V,
circuit.
-
‘iS
Rt
SP
MOTOR WINDING TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the motor.
Using
an
ohmmeter,
check
the
resistance
between
the
two
terminals
as
described
in
the
table
below. .
Table: Resistance of Motor
If incorrect readings are obtained, replace the motor.
(Also refer to test procedure H)
CARRY OUT 4R CHECKS
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