GE JVM1790BK - Profile 1.7 cu. Ft. Convection Microwave, Service Manual, Page: 32 / 49

• Display “PREHEAT 225 DEG”
• Ready beep
• Cycle 225°F
• Cbserve neon light
• Press start
7-21
- PROBLEM (A) -
Convection or Combination does not operate.
Convection
Cook
• Remove neon light
• Program bake cook
• 225°F (use dial)
• Press start
• Program fast bake cook
• 225°F (use dial)
• 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)
• Display “PREHEAT OFFSET ON”
• Ready beep
• Cycle 225°F
• Do not clear
• Program cook time 1 min
• Press start
• Auto shut-off at set cook
time
Combination
Cook
YES NO
Control
system
normal
YES
Replace
smart
board
Verity
control
xmfr
Repair
or
Replace
NO
Control
system
normal
YES
•Verify control
xfmr &
• Oven circuit
NO
• All normal except
• MW power Not
normal
High volt.
Section Repair
or
Replace
(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