GE JVM1790SK Service Manual - Page 35

C. Trouble Shooting, Problem - A, Problem - B

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Page 35 highlights

7-24 C. TROUBLE SHOOTING Before following this troubleshooting read TRIAL OPERATION on page 6- 1. • DISPLAY Problems, A thru C • HELP UP Problems, D thru E • BUZZER Problems, F PROBLEM - A: PLEASE ENTER TIME OF DAY does not appear in display window when power supply cord is plugged into wall outlet. 1 Check: 1. POWER SUPPLY 2. FUSE (See CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7- 18) 3. OVEN CAVITY THERMOSTAT BK/BL RD 0 120 120V Replace circuit board Measure voltage between pin 1 and pin 3 of connector CN1. PROBLEM - B: Display does not show correct numbers and/ or correct indications when programmed. 1 0 120 Voltage incorrect Correct connections Measure resistance of touch key board after removing connector S1. (See page 7-4 and 7-17) Normal resistance Check contact of connector S1 Resistance incorrect Replace touch key board. Normal circuit board Normal resistance Contact ok Poor contact Normal touch key board Replace circuit board Normal circuit board Correct seating Normal contact Runs Runs Runs Runs Runs

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7-24
C. TROUBLE SHOOTING
Before following this troubleshooting read TRIAL OPERATION on page 6- 1.
• DISPLAY Problems, A thru C
• HELP UP Problems, D thru E
• BUZZER Problems, F
PROBLEM - A:
PLEASE ENTER TIME OF DAY does not appear in display window when power supply cord is
plugged into wall outlet.
PROBLEM - B:
Display does not show correct numbers and/ or
correct indications when programmed.
Check: 1. POWER SUPPLY
2. FUSE (See CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7- 18)
3. OVEN CAVITY THERMOSTAT
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