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R-90GCH
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
H
BLOWN FUSE F1 20A
1. CARRY OUT 3D CHECKS.
2. If the fuse F1 20A is blown, there is a shorts or grounds in electrical parts or wire harness Check
then and replace the defective parts or repaire the wire harness.
3. CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE F1 20A WITH CORRECT VALUE REPLACEMENT.
1. CARRY OUT 3D CHECKS.
2. If the fuse F2 F10A is blown when the door is opened, check the secondary interlock switch, relay
RY2 and monitor switch.
3. If the fuse F2 F10A is blown by incorrect door switching, replace the defective switch(s) and the
fuse F2 F10A.
4. If the fuse F2 F10A is blown, there is a shorts or grounds in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
5. CARRY OUT 4R CHECKS.
CAUTION: ONLY REPLACE FUSE F2 F10A WITH CORRECT VALUE REPLACEMENT.
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BLOWN FUSE F2 F10A
1. CARRY OUT 3D CHECKS.
2. A continuity check across the temperature fuse terminals should indicate a closed circuit unless
the temperature of the magnetron reaches approximately 150˚C. An open temperature fuse TF
indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially
the cooling duct and cooling fan.
3. CARRY OUT 4R CHECKS.
CAUTION: IF THE TEMPERATURE FUSE TF INDICATES AN OPEN CIRCUIT AT ROOM TEM-
PERATURE, REPLACE TEMPERATURE FUSE.
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MAGNETRON TEMPERATURE FUSE TF TEST
1. CARRY OUT 3D CHECKS.
2. A continuity check across the thermal cut-out TC1 terminals should indicate a closed circuit unless
the temperature of the thermal cut-out TC1 reaches approximately 170˚C. The thermal cut-out
TC1 resets automatically at approximately 155˚C. If thermal cut-out TC1 has opened under
normal condition, replace the same item as in the parts list.
An open thermal cut-out TC1 indicates overheating of the top heating element unit. Check for
restricted air flow to the top heat element unit through the vent holes of the oven cavity, especially
the heater duct upper and convection fan.
3. CARRY OUT 4R CHECKS.
CAUTION: IF THE THERMAL CUT-OUT TC1 INDICATES AN OPEN CIRCUIT AT ROOM TEM-
PERATURE, REPLACE THERMAL CUT-OUT TC1.
K
THERMAL CUT-OUT (TOP HEATER) TC1 TEST
1. CARRY OUT 3D CHECKS.
2. A continuity check across the thermal cut-out TC2 terminals should indicate a closed circuit unless
the temperature of the thermal cut-out TC2 reaches approximately 150˚C. The thermal cut-out
TC2 resets automatically at approximately 130˚C. If thermal cut-out TC2 has opened under
normal condition, replace the same item as in the parts list.
An open thermal cut-out TC2 indicates overheating of the side heating element unit. Check for
restricted air flow to the side heat element unit through the vent holes of the oven cavity, especially
the heater duct left and convection fan.
3. CARRY OUT 4R CHECKS.
CAUTION: IF THE THERMAL CUT-OUT TC2 INDICATES AN OPEN CIRCUIT AT ROOM TEM-
PERATURE, REPLACE THERMAL CUT-OUT TC2.
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THERMAL CUT-OUT (SIDE HEATER) TC2 TEST