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R22AMM
7 – 3
[3] C: HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range.
Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this
second reading. The normal resistance is infinite in one direction and more than 100 k
Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this
second reading. The normal resistance is infinite in one direction and more than 100 k
Ω in the other direction.
CARRY OUT 4R CHECKS.
NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEA-
SURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN
INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
[4] D: HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
1. Isolate the high voltage capacitor from the circuit.
2. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.
3. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10M
Ω after it has been charged.
4. A short-circuited capacitor shows continuity all the time.
5. An open capacitor constantly shows a resistance about 10M
Ω because of its internal 10MΩ resistance.
6. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.
7. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
CARRY OUT 4R CHECKS.
[5] 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.
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
[6] F: WEAK POINT FFS-GA014 TEST
CARRY OUT 3D CHECKS.
If the weak point FFS-GA014 is blown, there could be a shorts or grounds in the oven lamp, control unit, T/C transformer or control unit. Check them
and replace the defective parts.
and replace the defective parts.
CARRY OUT 4R CHECKS.
CAUTION: Only replace weak point FFS-GA014 with the correct value replacement.
[7] G: WEAK POINT A017 TEST
CARRY OUT 3D CHECKS.
If the weak point A017 (F3) 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.
parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace weak point A017 (F3) with the correct value replacement.
[8] H: FUSE F10A TEST
CARRY OUT 3D CHECKS.
If the fuse F10A (F1 or F2) is blown when the door is opened, check the interlock switch (SW1 or SW2) and monitor switch (SW3 or SW4).
If the fuse F10A (F1 or F2) is blown by incorrect door switching replace the defective switch(es) and the fuse F10A (F1 or F2 F10A).
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse F10A (F1 or F2) with the correct value replacement.
Table: Terminal Connection of Switch
Plunger Operation
Common terminal to Normally open terminal
Common terminal to Normally close terminal
Released
Open circuit
Short circuit
Depressed
Short circuit
Open circuit.
B
C
HIGH VOLTAGE RECTIFIER
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