R-3A53
R-3A53B
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
E
SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described
in the following table.
Table: Terminal Connection of Switch
1 Plunger Operational ~~ C6M to NO
I
COM to NC 1
COM; Common terminal
S.C.; Short circuit
NO; Normally open terminal O.C.; Open circuit
NC; Normally closed terminal
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
F
TEMPERATURE FUSE TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the terminals of the temp. fuse.
Then using an ohmmeter, make a continuity test across the 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
(“Cl (“C)
temperature is
approx. 20°C.)
Temp. fuse 1 50°C
This is not resetable Above 1 50°C Closed circuit
(MG)
type.
Temp. fuse
This is not resetable Above 115°C Closed circuit.
115Oc
type
Temp. fuse 1 50°C
This is not resetable Above 1 50°C Closed circuit
(OVEN)
type.
If incorrect readings are obtained, replace the temp. fuse or thermal cut-out.
An open circuit temperature fuse 150°C indicates that the magnetron has overheated, this may
be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron
or HV circuit.
An open circuit temp. fuse 150°C (OVEN) indicates that the oven cavity has over heated, this
may be due to no load operation or catching fire of foods in the oven cavity.
An open circuit temp. fuse 115°C indicates that the inner parts of the oven have overheated, this
may be due to resisted ventilation.
An open circuit temperature controller indicators that the steam duct reaches high temperature.
15
To Next Page
Loading...
Need help?
General
