GE JVM1790SK Service Manual - Page 36

Problem - C, Problem - D

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Page 36 highlights

7-25 PROBLEM - C: Display does not start countdown when START key is touched. 1 Check: 1. TOUCH KEY BOARD (START KEY FUNCTION) Continuity OK Check continuity of connector CN5 between Pin 1(GN) and pin 3(PK) when the door is closed PROBLEM - D: Unit operation seems to be normal but no heating is produced in oven load. 1 Check: 1. AIR VENTS No continuity Normal operation Check operation of fan motor when START key is touched. No operation Check contact of connector S1 Contact OK Poor Correct Replace Circuit board Correct seating Adjust or replace door sensing switch. Normal Secondary switch Normal circuit board Normal contact Measure resistance of H.V.capacitor (see page 7-16) Resistance incorrect 33 Normal resistance: Infinite Replace H.V.C. Normal H.V.C. Replace Normal magnetron Measure resistance of fan motor Terminal A~C: 30 to 60 ohm Terminal A~B: 10 to 20 ohm Resistance incorrect 33 Normal resistance Replace fan motor Replace circuit board Normal fan motor Normal circuit board Runs Runs Runs Runs Runs Runs Runs

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7-25
PROBLEM - C:
Display does not start countdown when START key is touched.
Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)
Check: 1. AIR VENTS
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PROBLEM - D:
Unit operation seems to be normal but
no heating is produced in oven load.