Amana RST, RSS service manual Timer Testing, Operational Test, Operation And Service Procedures

OPERATION AND SERVICE PROCEDURES

(Models RST359, 361, 362, 365, 399)

TO AVOID THE RISK OF ELECTRIC SHOCK, PERSONAL INJURY OR DEATH DISCONNECT POWER BEFORE SERVICING, UNLESS TESTING REQUIRES IT.

5.At the end of the clean cycle the oven will turn off and the timer will display the time of day. No alarm will sound.

6.After the clean cycle, turn the selector switch to "MANUAL" and the oven control to "OFF".

The oven door can be opened approximately thirty (30) minutes after the completion of the clean cycle. Do not attempt to open the oven door latch until approximately thirty (30) minutes have elapsed, oth- erwise the door lock mechanism may be damaged. DO NOT FORCE THE LATCH HANDLE. If the door will not open, wait five (5) minutes and try again.

If a set button is pressed and the "SET TIME" knob is not rotated within four (4) seconds, the display will return to the time-of-day (except for SELF-CLEAN button).

TIMER TESTING

The electronic digital timer can be tested operationally and electrically.

OPERATIONAL TEST

3.Connect the ohmmeter set to RX1 range across either timer switch 11 to 12 or 13 to 14. Press in the "BAKE" button and hold. Meter should indicate open switch (infinite or very high ohms). While holding button in, set approximately one (1) minute on the display. Meter needle should swing to zero (0) ohms indicating switch closed. Repeat the procedure after transfer- ring the test leads to the other switch. Allow count- down to complete, buzzer should sound. Push button in to silence buzzer. Display should return to time of day.

4.With ohmmeter connected across one (1) of the switches and set to RX1 range, push in the "STOP" button and program time of day plus ten (10) minutes. Meter should indicate switches are open. Push in "BAKE TIME" button - switches should still remain open. With "BAKE TIME" button held in, program five

(5) minutes. Switches should still show open condi- tion. Allow timer to countdown, oven should start (switches close) in five (5) minutes. After five (5) more minutes switches should open, display indi- cates time of day and alarm sounds. Press bake button to silence alarm.

This test procedure requires power applied (120 VAC) either in the range or with 120 VAC line cord connected to terminals 1 and 2 for bench test. An ohmmeter or continu- ity tester should be alternately connected across switch terminals 11 to 12 and 13 to 14. Disconnect wire leads from terminals 11 to 12 and 13 to 14.

1.Press the three (3) left hand buttons simultaneously. Each element of the display should momentarily light in sequence followed by momentary four (4) zeros and then four (4) eights and two (2) arrows flashing. Ohmmeter checks across switch contacts 11 to 12 and 13 to 14 should indicate open switches (infinite or very high ohms). Ohmmeter should be on RX 1 range.

2.Reset time-of-day on display (press in two (2) left buttons and turn "TIME SET" knob). Push in minute timer button (far left) and program five (5) to ten (10) seconds in display. Timer switches should indicate open condition on ohmmeter. Alarm buzzer should sound at the end of the countdown. Push minute minder button to stop the alarm.

RC231002 Rev. 3 58

T"STAT IGNITOR VALVE

T"STAT

Figure 55 - Electronic Timer Switch Circuit