Epson 710C Projector User Manual

GE Consumer & Industrial
Technical Service Guide
SEPTEMBER 2009
GE Spacemaker®
Over-the-Range
Microwave Oven
Sensor Cooking
Popcorn
Beverage
Potato
Time
Cook
Reminder
Reheat
Vegetable
Defrost
Auto/Time
Delay
Start
Beeper
Volume
Turn
Table
Timer
On/Off
Help
Express Cook
JVM1750
JVM1540
1
2
3
Start
4
5
6
Clear
Off
7
Convenience Cooking
Popcorn
Beverage
Potato
Time
Cook
Reheat
Vegetable
Defrost Reminder Timer
On/Off
Auto/Time
Express Cook
1
2
3
4
5
6
Clear
Off
7
8
9
Delay
Start
0
Add
30 Sec.
Clock
Power
Level
Display
AM/PM
Scroll Speed
31-9190
GE Appliances
General Electric Company
Louisville, Kentucky 40225
–1–
Turn
Table
Surface
Light
Start
Pause
Vent
Fan
8
0
Power
Level
Display
Vent
Fan
Auto Nite
Light
9
Pause
Control Lock
Add
AM/PM
30 Sec. Scroll Speed
Surface
Light
Clock
IMPORTANT SAFETY NOTICE
The information in this service guide is intended for use by individuals possessing
adequate backgrounds of electrical, electronic, and mechanical experience. Any attempt
to repair a major appliance may result in personal injury and property damage. The
manufacturer or seller cannot be responsible for the interpretation of this information,
nor can it assume any liability in connection with its use.
WARNING
To avoid personal injury, disconnect power before servicing this product. If electrical
power is required for diagnosis or test purposes, disconnect the power immediately after
performing the necessary checks.
RECONNECT ALL GROUNDING DEVICES
If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to
ground are removed for service, they must be returned to their original position and
properly fastened.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY.
A.
DO NOT OPERATE OR ALLOW THE OVEN TO BE OPERATED WITH THE DOOR OPEN.
B.
IF THE OVEN OPERATES WITH THE DOOR OPEN, INSTRUCT THE USER NOT TO OPERATE THE OVEN
AND CONTACT THE MANUFACTURER IMMEDIATELY.
C.
MAKE THE FOLLOWING SAFETY CHECKS ON ALL OVENS TO BE SERVICED BEFORE ACTIVATING
THE MAGNETRON OR OTHER MICROWAVE SOURCE, AND MAKE REPAIRS AS NECESSARY:
1.
INTERLOCK OPERATION.
2.
PROPER DOOR CLOSING.
3.
SEAL AND SEALING SURFACES (ARCING, WEAR AND OTHER DAMAGE).
4.
DAMAGE TO OR LOOSENING OF HINGES AND LATCHES.
5.
EVIDENCE OF DROPPING OR ABUSE.
D.
BEFORE TURNING ON MICROWAVE POWER FOR ANY TEST OR INSPECTION WITHIN THE
MICROWAVE GENERATING COMPARTMENTS, CHECK THE MAGNETRON, WAVE GUIDE OR
TRANSMISSION LINE AND CAVITY FOR PROPER ALIGNMENT, INTEGRITY AND CONNECTIONS.
E.
ANY DEFECTIVE OR MISADJUSTED COMPONENTS IN THE INTERLOCK MONITOR, DOOR SEAL AND
MICROWAVE GENERATION AND TRANSMISSION SYSTEMS SHALL BE REPAIRED, REPLACED OR
ADJUSTED BY PROCEDURE DESCRIBED IN THIS MANUAL BEFORE THE OVEN IS RELEASED TO THE
OWNER.
F.
A MICROWAVE LEAKAGE CHECK TO VERIFY COMPLIANCE WITH THE FEDERAL PERFORMANCE
STANDARD SHOULD BE PERFORMED ON EACH OVEN PRIOR TO RELEASE TO THE OWNER.
GE Consumer & Industrial
Technical Service Guide
Copyright © 2009
All rights reserved. This service guide may not be reproduced in whole or in part
in any form without written permission from the General Electric Company.
–2–
Table of Contents
Bottom Thermal Cutout (TCO) .....................................................................................................................................19
Capacitor and Diode .......................................................................................................................................................23
Cavity Thermal Cutout ...................................................................................................................................................18
Component Locator Views ...........................................................................................................................................11
Components ........................................................................................................................................................................15
Control Boards and Panel Connections .................................................................................................................13
Control Features............................................................................................................................................................... 6
Control Panel Assembly .................................................................................................................................................17
Cooling Fan Motor ............................................................................................................................................................21
Demo Mode (JVM1750) ..................................................................................................................................................10
Diagnostics and Service Information ......................................................................................................................26
Door Assembly ...................................................................................................................................................................25
Door Interlock Switches .................................................................................................................................................24
Duct Assembly ...................................................................................................................................................................18
Grill Assembly .....................................................................................................................................................................16
High Voltage Transformer ............................................................................................................................................23
Hood Thermal Cutout (TCO) .........................................................................................................................................19
Interior Light ........................................................................................................................................................................17
Interlocks (Door Latch Switches)................................................................................................................................28
Introduction ......................................................................................................................................................................... 5
Key Panel Test ....................................................................................................................................................................29
Line Fuse ...............................................................................................................................................................................20
Magnetron............................................................................................................................................................................21
Magnetron Thermal Cutout (TCO)..............................................................................................................................19
Noise Filter ...........................................................................................................................................................................20
Nomenclature .................................................................................................................................................................... 4
Outer Cover .........................................................................................................................................................................15
Oven Removal ....................................................................................................................................................................15
Schematics and Wiring Diagrams ............................................................................................................................30
Smart Board ........................................................................................................................................................................18
Stirrer Assembly ................................................................................................................................................................20
Surface Lamps ...................................................................................................................................................................25
Turntable Motor .................................................................................................................................................................25
Vent Blower .........................................................................................................................................................................16
Vent Fan Motor Capacitor.............................................................................................................................................21
Warranty ..............................................................................................................................................................................34
–3–
Nomenclature
Model Number
J V M 1 7 5 0 D P 1 B B
Product
J = GE Cooking Product
Product Color
BB = Black
WW = White
SS = Stainless Steel
Microwave Oven
V = Externally Vented
Over-the-Range
Model Year Designator
Installation
M = Mounts Under Cabinet/
Built-In Capability
Model/Door Color
D = Color Matched
Cavity Size (cu. ft.)
15 = 1.5 cu. ft
17 = 1.7 cu. ft.
Feature Pack
Designates Features - the higher
the number, the more features.
Serial Number
The first two numbers of the serial number
identify the month and year of manufacture.
Example:
AS123456S = January, 2009
Nomenclature
A - JAN
D - FEB
F - MAR
G - APR
H - MAY
L - JUN
M - JUL
R - AUG
S - SEP
T - OCT
V - NOV
Z - DEC
The nomenclature plate is located inside the
microwave on the left side.
The mini-manual is located behind the
control panel on the right side of the oven.
–4–
2009 - S
2008 - R
2007 - M
2006 - L
2005 - H
2004 - G
2003 - F
2002 - D
2001 - A
2000 - Z
1999 - V
1998 - T
The letter designating
the year repeats every
12 years.
Example:
T - 1974
T - 1986
T - 1998
Introduction
The GE Spacemaker Over-the-Range Microwave Oven is a versatile appliance for any kitchen.
Features and Benefits:
Sensor Cook - The microwave oven automatically adjusts the cooking time to various types and amounts of
food.
Auto and Time Defrost - Auto defrost sets the defrosting time and power levels to deliver even defrosting
results for up to 6 pounds of meats, poultry, and fish. Time defrost defrosts for the length of time you specify.
Turntable On/Off - Rotate food for even cooking or disable the turntable to accommodate large casserole
dishes.
Removable Two-Position Oven Rack - The removable oven rack features two positions that allow more
flexibility when cooking multiple dishes at one time.
–5–
Control Features
JVM1750 Features
3
4
5
2
1
7
1 Door Handle. Pull to
open the door. The
door must be securely
latched for the
microwave to operate.
2 Door Latches.
3 Window with Metal
Shield. Screen
allows cooking to be
viewed while keeping
microwaves confined
in the oven.
8
9
6
7
4 Shelf. Lets you
microwave several
foods at once. Food
microwaves best when
placed directly on the
oven floor or turntable.
8 Removable Turntable.
Turntable and support
must be in place
when using the oven.
The turntable may be
removed for cleaning.
5 Touch Control Panel.
You must set the clock
and calendar before
using the microwave.
9 Convenience Guide.
6 Cooktop Light.
NOTE: Rating plate, oven
vent(s) and oven light are
located on the inside walls
of the microwave oven.
7 Grease Filter.
–6–
(Continued Next Page)
JVM1540 Features
1
2
3
10
9
4
8
1 Door Handle. Pull to
open the door. The
door must be securely
latched for the
microwave to operate.
2 Door Latches.
3 Window with Metal
Shield. Screen allows
cooking to be viewed
while keeping
microwaves confined
in the oven.
4 Touch Control Panel.
5 Cooktop Light.
6 Grease Filter.
5
6
7
7 Removable Turntable.
Turntable and support
must be in place
when using the oven.
The turntable may be
removed for cleaning.
8 Convenience Guide.
9 Shelf (some models).
Lets you microwave
several foods at once.
Food microwaves best
when placed directly
on the turntable.
Available at an extra
cost from your GE
supplier, or see GE
Service Numbers.
10 Rating Plate. Located
on the inside wall of
the microwave oven.
–7–
JVM1750 Controls
1
1
Time Features
Time Cooking
Press
TIME COOK I & II (Press once or twice)
DEFROST AUTO/TIME (Press twice)
EXPRESS COOK
POWER LEVEL
ADD 30 SEC
Enter
Amount of cooking time.
Amount of defrosting time.
Starts immediately!
Power level 1–10.
Starts immediately!
Defrosting by Weight
Press
DEFROST AUTO/TIME (Press once)
Enter
Food weight
2
2
3
Convenience Features (on some models)
Press
SNACKS (See Snacks Guide)
DEFROST AUTO/TIME
(Press once)
Enter
Snack type 1–6
Food weight
Option
number/weight
Press
POPCORN
BEVERAGE
REHEAT
POTATO
VEGETABLE (on some models)
Press once (fresh vegetables)
Press twice (frozen vegetables)
Press three times (canned vegetables)
Enter
Starts immediately!
Starts immediately!
Option
more/less time
Starts immediately!
Starts immediately!
Starts immediately!
more/less time
more/less time
more/less time
more/less time
more/less time
more/less time
(on some models)
COOK (on some models)
Press 1 for Chicken
Press 2 for Fish
Press 3 for Ground Meats
Press 4 for Fresh Vegetables
Press 5 for Frozen Vegetables
Press 6 for Canned Vegetables
Food type 1–6
Starts immediately!
3
Sensor Features
–8–
(Continued next page)
JVM1540 Controls
You can microwave
by time, temperature
or with the
convenience
features.
1
Time Features
Time Cooking
Press
TIME COOK I & II (Press once or twice)
DEFROST AUTO/TIME (Press twice)
EXPRESS COOK
POWER LEVEL
ADD 30 SEC
2
Enter
Amount of cooking time.
Amount of defrosting time.
Starts immediately!
Power level 1–10.
Starts immediately!
Convenience Features
Press
COOK (on some models)
POPCORN
Enter
Food type 1–9 + weight
Starts immediately!
REHEAT
BEVERAGE
POTATO
VEGETABLE (on some models)
DEFROST AUTO/TIME
(Press once)
(See Reheat Guide)
Starts immediately!
Starts immediately!
Food type 1–3 + weight
Food weight
–9–
Option
more/less time
serving size
serving size
serving size
serving size
Demo Mode (JVM1750)
•
To enter the Demo Mode, touch and hold the HELP pad for a full 3 seconds.
•
To end the Demo Mode, touch and hold the HELP pad for a full 3 seconds.
•
As pads are pressed in the Demo Mode, explanations of the pads' functions will be scrolled across the
display screen.
•
No components will actually be energized, however, during Demo Mode.
– 10 –
Component Locator Views
Front View
Grill Assembly
Control Panel Assembly
Turntable Shaft
Front View - Control Panel Assembly Removed
Cooling Fan Motor
Hood TCO
Bottom TCO
– 11 –
(Continued Next Page)
Right Side View
Fuse
High Voltage Capacitor
Diode
Vent Motor Capacitor
Magnetron TCO
Magnetron
Cooling Fan Motor
Cooling Fan
High Voltage Transformer
Hood TCO
Bottom TCO
– 12 –
Control Boards and Panel Connections
JVM1750 Smart Board
CN301
CN401
RY203
CN201
CN202
(Back Side)
CN201 - Vent Motor
CN202 - Turntable Motor, Cooktop Lamp
CN301 - Gas Sensor
CN401 - Hood TCO & Door Sensing Switch
RY203 - Secondary Relay (Power Relay)
(Front Side)
– 13 –
(Continued Next Page)
JVM1540 Smart Board
CN401
RY203
CN201
CN202
(Back Side)
CN201 - Vent Motor
CN202 - Turntable Motor, Cooktop Lamp
CN401 - Hood TCO & Door Sensing Switch
RY203 - Secondary Relay (Power Relay)
(Front Side)
– 14 –
Components
Oven Removal
The oven is hooked on metal tabs at the bottom of
the wall mounting plate and fastened to the cabinet
with 3 top cabinet bolts.
To remove the oven from the cabinet or wall
opening:
WARNING: This oven requires 2 people for complete
oven removal.
3. Remove 5 Phillips-head screws from the back of
the oven.
1. Disconnect power to the oven.
2. For top-vented models, disconnect the duct and
remove the damper assembly.
3. Remove the 3 top cabinet bolts.
Caution: When removing the oven, be sure to
provide adequate support to prevent dropping the
unit.
View From Rear
4. Pull the unit forward slowly.
4. Remove 3 Phillips-head screws from the bottom
of the oven.
5. Remove 2 Phillips-head screws from the right
side of the oven.
Outer Cover
To gain access to many of the oven components, it is
necessary to remove the outer cover.
To remove the outer cover:
1. Remove the oven. (See Oven Removal.)
2. Remove 4 Phillips-head screws from the top of
the oven.
Note: Model JVM1540 has 5 Phillips-head screws on
the top of the oven.
– 15 –
(Continued Next Page)
6. Remove 2 Phillips-head screws from the left side
of the oven.
4. Lift out the vent blower and place it on top of the
oven side as shown below and disconnect the
electrical connector to the vent blower.
Electrical Connector
View From Rear
7. Slide the outer cover back about 1 inch toward
the rear of the oven. Lift the cover from the
oven.
Vent Blower
The vent blower is located at the top rear of the
microwave oven. See installation instructions for
the proper method of directing the vent fan prior to
installing the unit.
Disconnect
To remove the vent blower:
1. Remove the oven. (See Oven Removal.)
2. Remove 2 Phillips-head screws from the back of
the oven.
Grill Assembly
To remove the grill assembly (Model JVM1540):
View From Rear
3. Lift the vent blower cover up to expose the vent
blower.
1. Remove 3 Phillips-head screws from the top,
front of the oven cabinet.
2. Slide grill to the left and remove.
View From Rear
– 16 –
4. Gently remove the bulb.
To remove the grill assembly (Model JVM1750):
1. Open the door.
2. Remove 2 Phillips-head screws from the top,
front of the oven cabinet.
3. Remove 1 Phillips-head screw from the right,
rear corner of the grill.
Bulb
4. Slide grill to the left and remove.
Control Panel Assembly
The control panel assembly consists of a smart
board, frame, and a touch pad/escutcheon.
To remove the control panel assembly:
1. Disconnect power to the microwave oven.
Interior Light
The interior light bulb is 120V, 40 watt (part number
WB06X10823).
2. Open the oven door.
To remove the interior light:
4. Remove the Phillips-head screw that attaches
the control panel to the oven.
1. Open the oven door.
3. Remove the grill assembly. (See Grill Assembly.)
2. Remove the 2 Phillips-head screws from the top
of the oven that attach the grill assembly to the
oven and remove the grill assembly.
Grill Assembly
(Model JVM1750)
3. Using a small flat blade screwdriver, push in the
interior light cover tab and remove the cover.
Tab
(Model JVM1540)
– 17 –
(Continued Next Page)
5. Tilt the top of the control panel out, and
mark and disconnect all the wiring harnesses
connected to the smart board.
Cavity Thermal Cutout
The cavity thermal cutout is located on the top side
of the oven cavity beside the exhaust duct. The
cutout has a temperature rating of 212˚F.
6. Remove the Phillips-head screw that attaches
the ground wire to the control panel assembly.
The cavity TCO is not resettable.
Note: Model JVM1540 does not have this ground
wire.
To remove the oven thermal cutout:
1. Remove the outer cover. (See Outer Cover.)
2. Remove the duct assembly. (See Duct Assembly.)
3. Disconnect wiring to the oven thermal cutout.
4. Slide the oven thermal cutout to the left to
remove it from the spring clip attaching it to the
oven cavity.
Disconnect
Duct Assembly
Disconnect
To access the cavity TCO, the duct assembly must
be removed.
Spring Clip
To remove the duct assembly:
1. Remove the outer cover. (See Outer Cover.)
2. Remove the 3 Phillips-head screws that attach
the duct assembly to the oven.
Smart Board
To remove the smart board:
1. Remove the control panel assembly. (See Control
Panel Assembly.)
2. Disconnect the touch panel ribbon from the
smart board.
3. Remove the 3 Phillips-head screws that attach
the smart board to the control board frame then
lift the smart board off the frame.
3. Lift the duct assembly up at the rear and pull
towards the back to release the tabs securing it
to the front frame.
– 18 –
Disconnect
4. Disconnect wiring to the magnetron TCO.
Bottom Thermal Cutout (TCO)
The bottom TCO is located on the bottom, right side
of the oven behind the control panel. The bottom
TCO is not resettable.
5. Remove 2 Phillips-head screws that attach the
magnetron TCO to the magnetron.
The bottom TCO's contacts open at approximately
248°F.
Disconnect
Disconnect
To remove the bottom TCO:
1. Remove the control panel assembly. (See Control
Panel Assembly.)
2. Disconnect wiring from the bottom TCO.
3. Remove the Phillips-head screw attaching
the bottom TCO to the oven, then pull the TCO
forward.
Hood Thermal Cutout (TCO)
The hood TCO is attached to the base plate. The
contacts close at approximately 158°F and open at
approximately 104˚F.
Disconnect
Disconnect
To remove the hood TCO:
1. Remove the control panel assembly. (See Control
Panel Assembly.)
2. Disconnect wiring to the hood TCO.
3. Remove the Phillips-head screw attaching the
hood TCO to the oven and pull the TCO forward.
Magnetron Thermal Cutout (TCO)
The magnetron TCO is located on the magnetron
and opens when the magnetron temperature
reaches 302°F.
The magnetron TCO is a normally closed switch. An
open reading across the TCO indicates a failed TCO.
The magnetron TCO resets at 140˚F.
Disconnect
Disconnect
To remove the magnetron TCO:
1. Remove the outer cover. (See Outer Cover.)
2. Disconnect the wiring to the magnetron.
3. Remove the 2 Phillips-head screws that attach
the magnetron to the oven.
Disconnect
View From Right Side
– 19 –
Stirrer Assembly
The stirrer assembly consists of a blade, pin, and
cover. The blade is air driven and rotates on a shaft
embedded in the stirrer cover. The stirrer assembly
is located at the top of the oven cavity.
To remove the stirrer:
Check to make sure the fuse is not open. Check the
noise filter for approximate resistance value at the
following locations:
White (neutral input) to white (neutral output) - 0 Ω.
Black (line input) to black (line output) - 0 Ω.
White (neutral input) to black (line input) - 23 Ω.
1. Disconnect power from the microwave oven and
open the door.
Line Fuse
2. Remove the plastic clip from the stirrer cover.
3. Rotate the stirrer cover to the left and remove
the stirrer cover.
Note: When the 20-amp fuse is blown due to
operation of the monitor switch, the monitor switch
must be replaced. Also replace the relays and/or the
interlock switches when the continuity check shows
the contacts are shorted.
The unit is equipped with a 20-amp fuse (part
number WB27X10928).
The fuse is located on a receptacle near the top of
the noise filter and is common to all functions and
door switches.
To remove the fuse:
1. Disconnect power to the microwave oven.
Noise Filter
The noise filter helps to suppress electromagnetic
interference (EMI) radiating from the operation of
the oven and also protects the oven from any line
noise. The noise filter is located on the right side of
the oven behind the control panel. The noise filter is
held in place by three compression pins.
2. Remove the control panel assembly. (See Control
Panel Assembly.)
3. Remove the fuse.
Note: When installing the noise filter, ensure all filter
wiring is connected to the correct terminals.
Fuse
L1 & N Out
L1 & N In
Pin
Pin
Noise Filter
Pin
– 20 –
Magnetron
WARNING: Prior to servicing the magnetron, be
certain the capacitor is discharged. Manually
discharge by placing an insulated-handle
screwdriver between the diode connection of the
capacitor and the oven chassis ground.
Disconnect
To remove the magnetron:
1. Remove the outer cover. (See Outer Cover.)
2. Disconnect wiring to the magnetron.
3. Remove the 2 Phillips-head screws that attach
the magnetron to the oven.
Disconnect
Disconnect
Disconnect
Disconnect
Cooling Fan Motor
The cooling fan and motor are located on the right
side of the microwave oven.
To remove the cooling fan and motor:
1. Remove the control panel assembly. (See Control
Panel Assembly.)
View From Right Side
2. Remove the outer cover. (See Outer Cover.)
3. Disconnect the wiring to the cooling fan motor.
Vent Fan Motor Capacitor
The vent fan motor capacitor is located on the top
of the oven above the cooling fan.
4. Remove the Phillips-head screw from the top,
right corner of the microwave.
To remove the vent fan motor capacitor:
1. Remove the outer cover. (See Outer Cover.)
2. Disconnect wiring to the motor capacitor.
Disconnect
3. Remove the Phillips-head screw that attaches
the motor capacitor to the oven.
– 21 –
(Continued Next Page)
5. Disconnect wiring to the primary of the high
voltage transformer.
8. Using a small flat blade screwdriver, carefully
remove the fan retainer.
Fan Retainer
Disconnect
View From Right Side
6. Remove 3 Phillips-head screws attaching the
cooling fan frame to the microwave.
9. Remove 2 Phillips-head screws that attach the
fan motor to the cooling fan frame.
7. Move the cooling fan frame out of the oven,
through the right side of the microwave.
– 22 –
Capacitor and Diode
Disconnect
The capacitor has an internal shunt resistor to
automatically discharge the capacitor when the
oven turns "off". Under normal operation, the
capacitor should fully discharge within 30 seconds.
WARNING: Always be certain the capacitor is
discharged before servicing. Mechanically discharge
the capacitor by placing an insulated-handle
screwdriver between the diode connection of the
capacitor and the oven chassis ground.
Disconnect
Disconnect
Note: Use the screw head close to the capacitor to
ensure ground metal contact.
To remove the capacitor and diode:
View From Right Side
1. Remove the outer cover. (See Outer Cover.)
2. Disconnect wiring to the high voltage capacitor.
3. Remove 6 Phillips-head screws from the bottom
of the microwave oven cabinet.
3. Remove the Phillips-head screw that attaches
the capacitor and diode to the oven and remove
the high voltage capacitor.
4. Disconnect the diode from the high voltage
capacitor.
Disconnect
Disconnect
4. Remove 4 Phillips-head screws that attach the
high voltage transformer to the bottom plate.
Diode
High Voltage Transformer
The high voltage transformer is located on the
right side of the microwave oven, beneath the
magnetron.
WARNING: Prior to servicing the transformer, be
certain the capacitor is discharged. Manually
discharge by placing an insulated-handle
screwdriver between the diode connection of the
capacitor and the oven chassis ground.
To remove the high voltage transformer:
1. Remove the outer cover. (See Outer Cover.)
2. Disconnect wiring to the high voltage
transformer.
– 23 –
3. Remove the 2 Phillips-head screws that attach
the door switch bracket to the microwave oven
frame and remove the door switch bracket.
Door Interlock Switches
The door has 3 interlock switches. All switches are
removed the same way.
Door Sensing and Primary Interlock Switches
The power relay is mounted on the smart board.
The primary interlock and door sensing switches
are activated by the latch heads on the door. When
the door is opened, the switches interrupt the
circuit to all components, except the oven lamp
and the control panel display. A cook cycle cannot
take place until the door is firmly closed, thereby
activating both interlock switches. The primary
interlock system consists of the door sensing switch,
the primary interlock switch, and the power relay.
Door Sensing
Disconnect
Monitor
Monitor Switch
The monitor switch is operated indirectly by the
bottom latch pawl. The pawl operates a cam switch,
which in turn, activates the monitor switch. The
switch is intended to render the oven inoperative
by means of blowing the monitor fuse when the
contacts of the primary interlock switch and power
relay fail to open when the door is opened.
Functions
When the door is opened, the monitor switch is
closed. At this time, the primary interlock switch and
the power relay are open.
Disconnect
Disconnect
Primary
4. Using a small flat blade screwdriver, release the
tabs and remove the door interlock switch from
the door switch bracket.
As the door goes to a closed position, the monitor
switch is first open and then the door sensing switch
and the primary interlock switch contacts close.
To remove the door interlock switches:
Tab
1. Disconnect wiring to the door switches.
Tab
– 24 –
Turntable Motor
The turntable motor is located on the bottom of the
microwave oven. Motor is a 21vac motor.
To remove the turntable motor:
1. Remove 6 Phillips-head screws from the bottom
of the microwave oven cabinet.
A microwave leakage test must be performed any
time a door is removed, replaced, disassembled, or
adjusted for any reason. The maximum leakage is 4
MW/CM2.
To remove the door, first remove the grill assembly.
(See Grill Assembly.) Then lift the door up and
disengage from the hinge pins.
Pin
2. Disconnect the turntable motor wiring harness.
3. Remove single Phillips-head screw and twist
motor slightly clockwise to release motor from
the tab on the frame.
Pin
Surface Lamps
The surface lamps are 120V, 40-watt incandescent
bulbs (part number WB06X10823).
Tab
Note: Model JVM1750 has two bulbs. The JVM1540
model has a single bulb.
To remove the surface lamp assemblies:
Disconnect
1. Remove the Phillips-head screw from the
surface lens panel, then open the panel.
Door Assembly
The door is available as a complete assembly or as
individual parts.
2. Carefully remove the bulbs.
– 25 –
Diagnostics and Service Information
JVM1750 Diagnosis Flow Chart
SMPS - SWITCHING MODE POWER SUPPLY
– 26 –
(Continued next page)
JVM1540 Diagnosis Flow Chart
SMPS - SWITCHING MODE POWER SUPPLY
– 27 –
6. Test the circuit operation:
Interlocks (Door Latch Switches)
a. Connect temporary jumper across relay
contacts and primary switch to simulate
shorted switch contacts. Locate convenient
connections in circuit to be certain COM
and N.O. terminals are used.
The interlocks are designed as follows:
Primary - Bottom switch operated by bottom latch
pawl connected to line (L) leg.
b. Connect an ohmmeter (Low Scale) across
the two line terminals of the appliance
power cord. Continuity must show:
•
Door Closed - Some Ω
•
Door Open - 0 Ω
c. Remove the 20-Amp. fuse - the circuit must
open (∞ Ω). If not, check the wiring of the
monitor and interlock circuits.
7. After the test, remove temporary jumper leads
from interlocks and relay. Reconnect monitor
switch leads, replace fuse.
8. Replacement of any parts in monitor circuit
requires repeating this entire test procedure.
To test the interlocks:
1. Disconnect power to the oven.
2. Open the control panel.
3. Discharge the capacitor.
4. Check continuity of COM and N.O.:
•
Door Closed - 0 Ω
•
Door Open - ∞ Ω
Monitor Switch
The monitor switch is located between the top and
bottom interlocks. The monitor switch is operated
indirectly by the bottom latch pawl.
The switch housing is not adjustable. It is fixed on
the front cavity with two screws.
To test the interlock system:
IMPORTANT - CHECK FOR MICROWAVE LEAKAGE
AFTER REPLACING OR ADJUSTING DOOR, INTERLOCK
SWITCHES OR BRACKETS.
1. Disconnect power to the oven.
2. Open the control panel.
3. Discharge the capacitor.
4. Disconnect the monitor switch leads and test at
the terminals:
•
Door Closed - ∞ Ω
•
Door Open - 0 Ω
5. Reconnect the switch wiring.
– 28 –
Key Panel Test
If necessary, the key panel pads can be verified by a continuity test. For ease of handling, the key panel
should be removed and placed on a flat surface. Check the continuity between the connections at the end of
the ribbon. (Use high Ω scale.)
RIBBON (JVM1750, HVM1750, EVM1750)
PAD
CONN.
PAD
ADD 30 SEC
4-11
AM/PM
HELP
4-12
START
TIMER ON/OFF
4-13
CLEAR
VEGETABLE
5-10
POWER LEVEL
TURNTABLE
5-12
DEFROST
REMINDER
5-13
TIME COOK
POTATO
6-10
1
AUTO NITE LIGHT
6-12
2
DELAY START
6-13
3
POPCORN
7-11
4
SURFACE LIGHT
7-12
5
CLOCK
7-13
6
REHEAT
8-11
7
VENT FAN
8-12
8
BEVERAGE
9-11
9
BEEPER VOLUME
9-12
0
JVM1540, JNM1541,
HVM1540
PAD
CONN.
BEVERAGE
6-11
POPCORN
5-11
POTATO
5-14
REHEAT
9-14
HVM1540 ONLY
PAD
CONN.
VEGETABLE
4-14
PAD
ADD 30 SEC
POWER LEVEL
DEFROST
AM/PM
SURFACE LIGHT
VENT FAN
TURNTABLE
REMINDER
TIME COOK
DELAY START
CLEAR
CLOCK
– 29 –
CONN.
9-13
3-11
3-12
3-14
4-15
5-15
9-16
8-16
7-16
6-16
5-16
4-16
9-15
8-15
7-15
6-15
RIBBON
CONN.
PAD
4-11
TIMER
3-14
START
4-15
1
9-13
2
7-12
3
8-12
4
5-12
5
5-13
6
5-15
7
6-13
8
3-12
9
7-13
0
CONN.
4-13
3-11
9-16
8-16
7-16
6-16
5-16
4-16
9-15
8-15
7-15
6-15
Schematics and Wiring Diagrams
JVM1750 Schematic Diagram
– 30 –
(Continued Next Page)
JVM1750 Wiring Diagram
– 31 –
JVM1540 Schematic Diagram
– 32 –
JVM1540 Wiring Diagram
– 33 –
Warranty
All warranty service provided by our Factory Service Centers,
or an authorized Customer Care® technician. To schedule service,
on-line, visit us at ge.com, or call 800.GE.CARES (800.432.2737).
Please have serial and model numbers available when calling
for service.
Staple your receipt here.
Proof of the original purchase
date is needed to obtain service
under the warranty.
For The Period Of: GE Will Replace:
One Year
From the date of the
original purchase
Any part of the microwave oven which fails due to a defect in materials or workmanship.
During this limited one-year warranty, GE will also provide, free of charge, all labor and related
service to replace the defective part.
What GE Will Not Cover:
■ Service trips to your home to teach you how to use
the product.
■ Replacement of house fuses or resetting of circuit
breakers.
■ Improper installation, delivery or maintenance.
■ Damage to the product caused by accident, fire, floods
or acts of God.
■ Product not accessible to provide required service.
■ Failure of the product or damage to the product if it is
abused, misused (for example, cavity arcing from wire
rack or metal/foil), or used for other than the intended
purpose or used commercially.
■ Incidental or consequential damage caused by possible
defects with this appliance.
■ Damage caused after delivery.
■ Replacement of the cooktop light bulbs.
EXCLUSION OF IMPLIED WARRANTIES—Your sole and exclusive remedy is product repair as provided
in this Limited Warranty. Any implied warranties, including the implied warranties of merchantability
or fitness for a particular purpose, are limited to one year or the shortest period allowed by law.
This warranty is extended to the original purchaser and any succeeding owner for products purchased
for home use within the USA. If the product is located in an area where service by a GE Authorized Servicer
is not available, you may be responsible for a trip charge or you may be required to bring the product to an
Authorized GE Service Location for service. In Alaska, the warranty excludes the service calls to your home.
Some states do not allow the exclusion or limitation of incidental or consequential damages. This warranty
gives you specific legal rights, and you may also have other rights which vary from state to state. To know
what your legal rights are, consult your local or state consumer affairs office or your state’s Attorney General.
Warrantor: General Electric Company. Louisville, KY 40225
– 34 –