Test Procedures - Amana A1200S Service

Test Procedures

!
Before touching any oven components or wiring, always unplug the oven from its power source and discharge the
capacitor by shorting across the capacitor terminals with an insulated handle screwdriver.
High Voltage Component Test Chart
COMPONENT
CAPACITOR
DIODE
TYPE I
TYPE II
MAGNETRON
POWER TRANSFORMER
DANGER
TEST SET-UP
DISCHARGE THE CAPACITOR
Remove wires from capacitor terminals
and connect ohmmeter, set on highest
resistance scale to terminals.
Also check between each terminal and
the capacitor case.
DISCHARGE THE CAPACITOR Isolate the
diode by disconnecting the wiring. On
type I diodes remove both wires. On type II
diodes disconnect one wire to diode.
It is not necessary to remove the mounting
screw.
Connect ohmmeter, set on highest
resistance scale, to diode terminals.
Reverse meter leads for second testing.
On type I diodes, test from each terminal
to ground.
DISCHARGE THE CAPACITOR
Remove wires from magnetron and
connect ohmmeter to its terminals.
Also check between each terminal
and ground.
DISCHARGE THE CAPACITOR
To check primary winding, remove wires
from terminals (marked 1 & 2 FS-10 EVP,
VEND-10, or COM & 208 OR 240
FS-14 EVP). Connect ohmmeter between
primary terminals.
Check from each primary terminal to ground.
Also check high voltage winding, remove
wire from either secondary terminal marked
HI or LO terminal and oven chassis ground.
To check filament windings, remove
filament leads 3 & 4 and measure
resistance across leads.
Also check between each terminal
and ground.
High voltages are present during the cook cycle.
Extreme caution should be observed at all times.
NORMAL READING (Approximate)
BETWEEN TERMINALS: Analog meter
should momentarily deflect toward zero
then return a resistance greater than 5 meg
ohms. If no deflection occurs, or if
continuous deflection occurs, replace
capacitor.
TERMINAL TO CASE: Infinite resistance.
Infinite resistance should be measured in
one direction and 50,000 to 200,000 ohms
in the opposite direction:
NOTE: Ohmmeter must be an analog meter
and contain a battery of 6 volts minimum.
EACH TERMINAL TO GROUND:
(Type I only) Infinite resistance.
BETWEEN TERMINALS :
Less than 1 ohm.
EACH TERMINAL TO GROUND:
Infinite resistance.
NOTE: This test is not conclusive. If the
oven does not heat and all other
components test good replace the
magnetron and retest.
PRIMARY: Less than 1 ohm
EACH TERMINAL TO GROUND:
Infinite resistance
HI TO GROUND:
40 to 80 ohms
LO TO GROUND:
40 to 80 ohms
FILAMENT:
Less than 1 ohm
FILAMENT TO GROUND:
Infinite resistance.
13
DEPENDING ON
TRANSFORMER
MANUFACTOR
RE220002 Rev. 6