GE JVM1790SK Service Manual - Page 32

(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. 1) The start function fails to operate but the high voltage Systems, the interlock switches, the door sensing and the relay check good. 2) The unit with a normal relay continuously operates. 3) Proper temperature measurement is not obtained. 4) The buzzer does not sound or continues to sound. 5) Some segments of one or more digits do not light up, or they continue to light up, or segments light when they should not. 6) Wrong figures appear. 7) The figures of all digits. 8) Some of the indicators do no flicker light up. 9) The clock does not keep time properly. NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. (4) CHECKOUT PROCEDURES FOR CONVECTION - PROBLEM (A) Convection or Combination does not operate. Convection Cook • Remove neon light • Program bake cook • 225°F (use dial) • Press start • Display "PREHEAT OFFSET ON" • Ready beep • Cycle 225°F YES NO • Do not clear • Program cook time 1 min • Press start • Auto shut-off at set cook time YES NO Control system normal Replace smart board Verity control xmfr Repair or Replace Combination Cook • Program fast bake cook • 225°F (use dial) • Press start • Display "PREHEAT 225 DEG" • Ready beep • Cycle 225°F • Cbserve neon light • Press start • Do not clear • Program fast back cook time 2 min. • Press start • Neon cycle • MW "ON" 13 sec then MW "OFF" & heater "ON" 17 sec • Auto turn "OFF" (2 min) YES NO Control system normal •Verify control xfmr & • Oven circuit • All normal except Not • MW power normal High volt. Section 7-21 Repair or Replace