Sharp R-22AT Service Manual

12
R-22AT
R-23AM
R-24AT
F FUSE F3, F4 M8A TEST
CARRY OUT 3D CHECKS.
If the fuses F3 and/or F4 M8A are blown, there could be shorts in the high voltage transformers T1 and/
or T2 or there is a ground in wire harness. Check and/ or replace the high voltage transformers T1 and/
or T2 or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace
fuses F3, F4 M8A with the correct value replacement.
G FUSE F1 F13A TEST
CARRY OUT 3D CHECKS.
If the fuse F1 F13A is blown, there could be a shorts or grounds in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse F1 F13A with the correct value replacement.
Table: Terminal Connection of Switch
Plunger Operation COM to NO COM to NC
Released Open circuit Short circuit
Depressed Short circuit Open circuit
COM; Common terminal,
NO; Normally open terminal
NC; Normally close terminal
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
H FUSE F2 F6.3A TEST
CARRY OUT 3D CHECKS.
If the fuse F2 F6.3A is blown when the door is opened, check the 1st. latch switch SW1, monitor switch
SW4 and monitor resistor R1.
If the fuse F2 F6.3A is blown by incorrect door switching replace the defective switch(s) and the fuse
F2 F6.3A.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse F2 F6.3A with the correct value replacement.
1. CARRY OUT 3D CHECKS.
2. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the
temperature of the temperature fuse reaches specfied temperature as shown below.
I TEMPERATURE FUSE TEST
3. CARRY OUT 4R CHECKS.
CAUTION: IF THE temperature fuse INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE temperature fuse.
Open Close Display or
temperature temperature Condition Check point
Magnetron tem-
perature fuse
TF1
Magnetron tem-
perature fuse
TF2
Blower motor tem-
perature fuse
TF3
Oven temperature
fuse TF4
150˚C
120˚C
120˚C
Non resetable
type
Non resetable
type
Non resetable
type
EE1
EE3
EE2
Oven shut
off
Oven shut
off
Magnetron
MG1 Failure:
Test magnetron
MG1 and Blower fan motor.
Magnetron MG1, MG2 Failure: Test magnetron MG1,
MG2. Check blower fan motor and ventilation opening.
Magnetron MG2 Failure:
Test magnetron
MG2 and Blower fan motor.
Check blower fan motor and ventilation opening or
rocked rotating of blower fan motor.
Food has been burned in oven.
Temperature of oven inside is very high.

Sharp R-22AT Specifications