R-9HlO
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
4. Room temperature should be around 20 “C.
5. Power supply voltage should be specification voltage.
(RD82304U’)
B
POWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance
of the primary coil sho.uId be approx. 1.3 ohm and the resistance of the high voltage coil should
be approximately 72 ohms; the resistance of the filament coil should be less than 1 ohm.
(HIGH VOLTAGES ARE PRESENT TO HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASlJRE THE FILAMENT AND HIGH VOLTAGE.)
(RD82401 U’)
C HIGH VOLTAGE RECTIFIER AND RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
HIGH VOLTAGE RECTIFIER TEST
Isolate the high voltage rectifier from the circuit. Using the highest ohm scale of the meter, read
the resistance across the terminals and observe, reverse the leads to the high voltage rectifier
terminals and observe meter reading. If a short is indicated in both directions, or if an infinite
resistance is read in both directions, the high voltage rectifier is probably defective and should
be replaced.
ASYMMETRIC RECTIFIER TEST
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance
across the terminals, reverse the leads to the rectifier terminals and observe meter reading. If an
infinite resistance is read in both directions, the rectifier is good.
If a short is indicated in either direction, the one is probably defective and should be replaced.
D
HIGH VOLTAGE CAPACITOR TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input
leads and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity for a short time and should indicate approximately IOM 0 once the capacitor is
charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted
between the terminals. If it is shorted, replace the capacitor.
tRD82603U)
SWITCH TEST
Isolate the switch and check the contacts by using an ohmmeter using the following table.
If improper operation is indicated, make the necessary switch adjustment or replacement.
Table: Switch Connection
Connection Common Terminal-Normally Open Terminal
(COM)
Common Terminal-Normally Close Terminal
(NO)
Operation
(COM) (NC)
i
Plunger released
Plunger pushed
Open circuit
Closed circuit
Close circuit
Open circuit
C RD82701 U)
15
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