LG D5988B User manual

Website:http://www.LGservice.com [For U.S.A]
www.lg.ca [For Cana a]
ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLES CORRECTLY BEFORE OFFERING SERVICE.
MODEL :
DLE5977W/DLG5988W
DLE5977B/DLG5988B
DLE3777W/DLG3788W

Feb. 2004 PRINTED IN KOREA P/No.:3828EL3005A

2
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.
!
WARNING !
WHAT TO DO IF YOU SMELL GAS:
IMPORTANT SAFETY NOTICE
The information in this service gui e is inten e for use by in ivi uals possessing a equate backgroun s
of electrical, electronic, an mechanical experience. Any attempt to repair a major appliance may result in
personal injury an property amage. The manufacturer or seller cannot be responsible for the
interpretation of this information, nor can it assume any liability in connection with its use.
RECONNECT ALL GROUNDING DEVICES
If groun ing wires, screws, straps, clips, nuts, or washers use to complete a path to groun are
remove for service, they must be returne to their original position an properly fastene .
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD may damage or weaken the electronic
control assembly. The new control assembly may appear to work well after repair is
finished, but failure may occur at a later date due to ESD stress.
Use an anti-static wrist strap. Connect wrist strap to green groun connection point or unpainte
metal in the appliance.
- OR -
Touch your finger repeatedly to a green ground connection point or unpainted metal
in the appliance.
Before removing the part from its package, touch the anti-static bag to a green groun connection
point or unpainte metal in the appliance.
Avoi touching electronic parts or terminal contacts; han le electronic control assembly by e ges only.
When repackaging faile electronic control assembly in anti-static bag, observe above instructions.
Do not try to light a match, or cigarette, or turn on
any gas or electrical appliance.
Do not touch any electrical switches. Do not use any
phone in your building.
Clear the room, building or area of all occupants.
Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions
carefully.
If you cannot reach your gas supplier, call the fire
department.

3
1. SPECIFICATIONS ..................................................................................................................4
2. FEATURES AND BENEFITS .................................................................................................... 5
3. INSTALLATION INSTRUCTIONS ........................................................................................... 6
4. DRYER CYCLE PROCESS..................................................................................................... 12
5. COMPONENT TESTING INFORMATION ..............................................................................13
6. MOTOR DIAGRAM AND SCHEMATIC..................................................................................16
7. CONTROL LAY - OUT .........................................................................................................17
8. WIRING DIAGRAM ............................................................................................................18
9. DIAGNOSTIC TEST .............................................................................................................19
9-1. TEST 1 120VAC ELECTRICAL SUPPLY..........................................................................20
9-2. TEST 2 THERMISTOR TEST --- MEASURE WITH POWER OFF .......................................21
9-3. TEST 3 MOTOR TEST ................................................................................................22
9-4. TEST 4 MOISTURE SENSOR ....................................................................................23
9-5. TEST 5 DOOR SWITCH TEST ...................................................................................24
9-6. TEST 6 HEATER SWITCH TEST - ELECTRIC TYPE...........................................................25
9-7. TEST 7 GAS VALVE TEST - GAS TYPE .........................................................................26
10. CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) ...............................................27
11. DISASSEMBLY INSTRUCTIONS .........................................................................................29
12. EXPLODED VIEW ..............................................................................................................36
12-1. CONTROL PANEL & PLATE ASSEMBLY .......................................................................36
12-2. CABINET & DOOR ASSEMBLY...................................................................................37
12-3-1. DRUM & MOTOR ASSEMBLY : ELECTRIC TYPE ........................................................38
12-3-2. DRUM & MOTOR ASSEMBLY : GAS TYPE ...............................................................39
13. REPLACEMENT PARTS LIST
CONTENTS

Equipped
Temperature
Moisture
Equipped
Adopted
Equipped
27" x 42
3/4" x 28 1/3"
29 1/2" x 44 3/4" x 30 3/4"
Hig / Low / Off
Equipped
Stainless Steel
Equipped
Sensor
55
126 / 144
Door Trim
Top Plate
Color
Blue W iteC romate + STS Deco
PaintedPorcelain
Blue W ite
120V / 240V 60Hz (26A)
POWER SUPPLY
LAMP
HEATER
MOTOR
55
79
7.3 cu.ft.
Electronic
15W (125mA)
GAS VALVE 13W (110mA) X 2
5400W (22.5A)
55
250W (4.5A)
ELECTRICITY
CONSUMPTION
Blue W ite Black
Material &
Finis es
DLE3777WDLE5977W
DLG3788WDLG5988W
DLE5977B
DLG5988B
ITEM
C ild Lock
Reversible Door
Interior Lig t
Product (WXHXD)
Packing (WXHXD)
Audible End of Cycle Beeper
Dryer Rack
Drum
No. of Dry Levels
No. of Dry Option
No. of Programs
DRUM CAPACITY
CONTROL TYPE
No. of Temperature Controls
Weig t (lbs): Net / Gross
AC 120V ( GAS TYPE)
AC 240V ( ELECTRIC TYPE)
T ermistor
Electro sensor
AC 120V
AC 120V
REMARK
4
SPECIFICATIONS
1

5
FEATURES AND BENEFITS
2
DLE5977W/DLG5988W/DLE5977B/DLG5988B
DLE3777W/DLG3788W

6
INSTALLATION INSTRUCTIONS
3
Use the instructions at this section if your home has
a 3-wire receptacle (NEMA type 10-30R) and you
will be using a UL listed, 120/240 volt minimum,
30 amp, dryer power supply cord.
Review the following options to determine the appropriate electrical connection
for your home:
3-wire receptacle
(NEMA type10-30R)
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
4 wire direct
Important : The places where a 4-wire connection
is needed are , for example, mobile homes and areas
that local codes do not admit the use of 3-wire
connections.
At least, 5ft(1.52m) of extra length is required in
order for dryer to be able to be moved.
Peel 5 in (12.7cm) of external covering from end
of cable, leaving bare ground wire at 5 in (12.7cm).
Cut 11/2 in. (3.8cm) from 3 remaining wires. Peel
insulation back 1in. (2.5cm). Shape ends of wires
like a hook.
Then, put the hooked shape end of the wire under
the screw of the terminal block(hooked end facing
rightward) and pinch the hook together and screw
tightly.
4-wire connection : Direct wire
Use the instructions at this section if your home has
a 4-wire receptacle (NEMA type 14-30R) and you
will be using a UL listed, 120/240 volt minimum,
30 amp, dryer power supply cord.
4-wire receptacle
(NEMA type14-30R)
5"
(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
If this type is available at your home. you will be
connecting to a fused disconnect or circuit breaker
box
1.Take off center terminal block screw
2.Take off appliance neutral ground wire(white) from
external ground connector screw. Fasten it under
center, silver colored terminal block screw.
3.Connect ground wire(green) of power supply cable
to external ground conductor screw. Tighten screw.
3 wire direct
5"
(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
5"
(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
a. External ground connector
b. Green copper wire of power supply cord
c. 3/4 in. (1.9cm) UL-listed strain relief
d. Center silver-colored terminal block screw
e. Neutral grounding wire(white)
f. Neutral wire(white or center wire)
f
a
b
e
d
c

7
4. Put the hooked shape ends of the wire under the
screw of the terminal block(hooked end facing
rightward) and squeeze the hook together and screw
tightly.
5. Put the hooked shaped ends of the other power
supply cable wires under the outer terminal block
screws(hooked end facing right) and squeeze the
hooked ends together and screw tightly.
6. Tighten strain relief screws.
7. Place the tab of terminal block cover into slot of
dryer rear panel. Make sure cover with screw.
Important : The places wherea 4-wire connection is
needed are mobile homes and areas that local codes
do not admit the use of 3-wire connections.
At least, 5ft(1.52m) of extra length is required for
dryer to be able to move.
Peel 5 in (12.7cm) of external covering from end
of cable, leaving bare ground wire at 5 in (12.7cm).
Cut 11/2 in. (3.8cm) from 3 remaining wires. Strip
insulation back 1in. (2.5cm). Shape ends of wires
into a hook shape.
1. Take off center terminal block screw
2. Put the hooked end of the neutral wire(white) of
power supply cable under the center screw of
terminal block). Squeeze the hooked end together
3. Connect the hooked ends of the other power
supply cable to the center screw of terminal block.
4. Screw strain relief tightly.
5. Place tab of terminal block cover into slot of
dryer rear panel. Make sure cover with screw.
Then, put the hooked shape end of the wire under
the screw of the terminal block(hooked end facing
rightward) and pinch the hook together and screw
tightly.
3-wire connection : Direct wire
5"
(12.7 cm)
31/2"
(8.6 cm)
1"
(2.5 cm)
5"
(12.7 cm)
1"
(2.5 cm)
3V2"
(8.9 cm)
a. External ground connector
b. Neutral grounding wire (white)
c. Center silver-colored terminal block screw
d. Neutral wire (white or center wire)
e. 3/4 in. (1.9 cm) UL-listed strain relief
e
a
d
b
c

8
a. 3-wire receptacle (NEMA type 10-30R)
b. 3-wire plug
c. Neutral prong
d. Spade terminals with up turned ends
e. 3/4 in. (1.9 cm) UL approved strain relief
f. Ring terminals
g. Neutral (white or center wire)
a. External ground connector
b. Neutral grounding wire (white)
c. Center silver-colored terminal block screw
d. Neutral wire (white or center wire)
e. 3/4 in. (1.9 cm) UL-listed strain relief
1. Loosen or remove center terminal block screw.
2. Connect neutral wire (white or center wire) of
power supply cord to the center, silver colored
terminal screw of the terminal block. Tighten
screw.
3. Connect the other wires to outer terminal block
screws. Tighten screws.
4. Tighten strain relief screws.
5. Insert tab of terminal block cover into slot of
dryer rear panel. Secure cover with hold-down
screw.
e
a
d
b
c
d
gf
a
lf your local codes or ordinances permit the
connection of a frame-grounding conductor to the
neutral wire, use these instructions. If your local
codes or ordinances do not allow the connection of
a frame-grounding conductor to the neutral wire,
use the instructions under Section 3: Optional
3-wire connection.
Option 1: 3-Wire Connection with
a Power Supply Cord

9
a. 4-wire receptable (NEMA type 14-30R)
b. 4-pront plug
c. Ground prong
d. Neutral Prong
e. Spade terminals with upturned ends
f. 3/4 in. (1.9 cm) UL approved strain relief
g. Ring terminals
a. External ground connector - Dotted line
shows position of NEUTRAL ground wire
before being moved to center terminal block
screw
b. Center silver-colored terminal block screw
c. White wire of harness
1. Remove center terminal block screw.
2. Remove appliance neutral ground wire (white)
from external ground connector screw. Fasten it
under the center, silver colored terminal block
screw.
3. Connect ground wire (green or bare) of power
supply cable to external ground conductor screw.
Tighten screw.
4. Connect neutral wire (white or center wire) of
power supply cord to the center, silver colored
terminal screw of the terminal block.
a
b
c
a. External ground connector
b. Green or bare copper wire of power supply cord
c. 3/4 in. (1.9 cm) UL-listed strain relief
d. Center silver-colored terminal block screw
e. Neutral grounding wire (white)
f. Neutral wire (white)
5. Connect the other wires to outer terminal block
screws. Tighten screws.
6. Tighten strain relief screws.
7. Insert tab of terminal block cover into slot of
dryer rear panel. Secure cover with hold-down
screw.
f
a
b
e
d
c
• lf your local codes or ordinances do not allow the
use of a 3 wire connection, or you are installing
your dryer in a mobile home, you must use a 4-
wire connection.
Option 2: 4-wire connection with a
Power supply cord.

10
• If your local codes or ordinances do not allow the
connection of a frame-grounding conductor to the
neutral wire, use the instructions under this
section.
1. Remove center terminal block screw.
2. Remove appliance neutral ground wire (white)
from external ground connector screw. Connect
appliance ground wire and the neutral wire (white
or center wire) of power supply cord/cable under
center, silver colored terminal block screw.
Tighten screw.
3. Connect the other wires to outer terminal block
screws. Tighten screws.
4. Tighten strain relief screws.
5. Insert tab of terminal block cover into slot of
dryer rear panel. Secure cover with hold-down
screw.
6. Connect a separate copper ground wire from the
external ground connector screw to an adequate
ground.
Option 3: Optional 3-wire
connection.
a. External ground connector
b. Neutral grounding wire (white)
c. Neutral wire (white or center wire)
d. Grounding path determined by a qualified electrician
c
a
b
d

11
3-2. Connect Gas Supply Pipe (Gas Dryer ONLY)
2
3
5
1
4
1. Make certain your ryer is equippe for use with the
type of gas in your laun ry room. Dryer is equippe
at the factory for Natural Gas with a 3/8” N.P.T. gas
connection.
2. Remove the shipping cap from the gas connection
at the rear of the ryer. Make sure you o not
amage the pipe threa when removing the cap.
3. Connect to gas supply pipe using a new flexible
stainless steel connector.
4. Tighten all connections securely. Turn on gas an
check all pipe connections (internal & external) for
gas leaks with a non-corrosive leak etection flui .
5. For L.P. (Liquefie Petroleum) gas connection, refer
to section on Gas Requirements.
For further assistance, refer to section on Gas Requirements.
1 New Stainless Steel Flexible Connector - Use
only if allowed by local codes (Use Design
A.G.A. Certified Connector)
2 1/8” N.P.T. Pipe Plug
(for checking inlet gas pressure)
3 Equipment Shut-Off Valve-Installed within 6’
(1.8 m) of dryer
4 Black Iron Pipe
Shorter than 20’ (6.1 m) - Use 3/8” pipe
Longer than 20’ (6.1 m) - Use 1/2” pipe
5 3/8” N.P.T. Gas Connection

12
Time
DRYER CYCLE PROCESS
4
Cycle
HEAVY DUTY
3Hr
3Hr
Off Time: 6min
On Time: 10sec
Temperature Control for each cycle
HIGH
MID
HIGH
MEDIUM
LOW
LOW
ULTRA
LOW
(HIGH)
(MID
HIGH)
COTTON/
TOWELS
NORMAL
PERM
PRESS
DELICATES
ULTRA
DELICATE
SPEED DRY
FRESHEN UP
AIR DRY
-
(Normal)
(Normal)
(Normal)
(Normal)
(Normal)
(Normal)
-
-
-
54min Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
Saturation
55min
41min
36min
32min
34min
25min
20 min
30 min
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
(5min)
N/A
68±4°C
66±4°C
60±4°C
52±3°C
52±3°C
45±3°C
(70±5°C)
(66±5°C)
No
heater
47±5°C
47±5°C
47±5°C
47±5°C
38±5°C
38±5°C
(47±5°C)
(47±5°C)
N/A Saturation
Load
Sensor
Dry *
Manual
Dry **
Default
Drying
Electro-
sensor
Temp-
Control
Default
time
Temp-
Control **
Cooling Wrinkle care
Conditions of operation and termination
Temp-
erature
Dry
Level
Display
time
Motor
Heater
* Sensor ry : “Dry Level” is set by users.
** Manual ry : “Temperature control” is set by users.
Default settings can be a juste by users.

13
When checking the Component, be sure to turn the power off, and do voltage discharge sufficiently.
COMPONENT TESTING INFORMATION
5
!
CAUTION
Component Test Procedure Check result Remark
1. Thermal cut off
• Check Top Marking :
N130
Measure resistance of terminal
to terminal
Open at 266 ±12°F
(130 ±7°C)
Auto reset -31°F (-35°C)
Same shape as Outlet Thermostat.
If thermal fuse is open must
be replace
Resistance value ∞
Continuity (250°F ) < 1Ω
• Heater case-
Safety
• Electric type
2. Hi limit Thermostat
(Auto reset)
Measure resistance of terminal
to terminal
Open at 257 ±9°F
(125 ±5°C)
Close at 221 ±9°F
(105 ±5°C)
Resistance value ∞
Resistance value < 5Ω
• Heater case -
Hi limit
• Electric type
3. Outlet Thermostat
( Auto reset)
• Check Top Marking :
N85
Measure resistance of terminal
to terminal
Open at 185 ±9°F
(85 ±5°C)
Close at 149 ±9°F
(65 ±5°C)
Same shape as Thermal cut off.
Resistance value ∞
Resistance value < 5Ω
• Blow housing -
Safety
• Electric type
4. Lamp hol er Measure resistance of terminal
to terminal
Resistance value :
80Ω ~ 100Ω
6. I ler switch Measure resistance of the
following terminal :
“COM - NC”
1. lever open
Resistance value < 1Ω
2. Lever push (close)
Resistance value ∞
5. Door switch Measure resistance of the
following terminal
1) Door switch knob : open
Terminal : “COM” - “NC” (1-3)
Terminal : “COM” - “NO” (1-2)
2) Door switch push : push
Terminal : “COM” - “NC” (1-3)
Terminal : “COM” - “NO” (1-2)
Resistance value < 1Ω
Resistance value ∞
Resistance value ∞
Resistance value < 1Ω
The state that
Knob is
presse is
opposite to
Open
con ition.

14
Component Test Procedure Check result Remark
7. Heater Measure resistance of the
following terminal
Terminal : 1 (COM) - 2
Terminal : 1 (COM) - 3
Terminal : 2 - 3
Resistance value : 10Ω
Resistance value : 10Ω
Resistance value : 20Ω
• Electric type
8. Thermistor Measure resistance of terminal
to terminal
Temperature con ition :
58°F ~ (10~40°C)
58°F ~ 104F (10~40°C)
Resistance value : 10Ω • Heater case -
Hi limit
• Electric type
9. Motor • See Page 13
10. Gas valve valve 1
valve 2
Measure resistance of the
following terminal
Valve 1 terminal
Valve 2 terminal
Resistance value : > 1.5kg ~
Resistance value :
> 1.5~2.5kg
• Gas type
11. Igniter Measure resistance of terminal
to terminal
Resistance value : 100~800Ω • Gas type
12. Frame Detect Measure resistance of terminal
to terminal
Open at 370°F ((Maximum)
Close at 320°F
Resistance value ∞
Resistance value < 1Ω
• Gas type

15
Component Test Procedure Check result Remark
13. Outlet Thermostat
(Auto reset)
• Check Top Marking :
N95
Measure resistance of terminal
to terminal
Open at 203 ±7°F (95 ±5°C)
Close at 158 ±9°F (70 ±5°C)
Resistance value ∞
Continuity < 1Ω
• Gas type
• Gas funnel
13. Outlet Thermostat
(Manual reset)
• Check Top Marking :
N100
Measure resistance of terminal
to terminal
Open at 212 ±12°F
(100 ±7°C)
Manual reset
If thermal fuse is open must
be replace
Resistance value ∞
Continuity < 1Ω
• Gas type
• Gas funnel

16
MOTOR DIAGRAM AND SCHEMATIC
6
Contact On / Off by Centrifugal Switch
STOP MODE
(When Motor oes not operate)
RUN MODE
(Motor operates)
When checking Component, be sure to turn Power off, then do voltage discharge sufficiently.
NOTE
Centrifugal switch Centrifugal switch
(Pull Drive forward)

17
CONTROL LAY - OUT
7
PWB ASSEMBLY DISPLAY LAY-OUT
PWB ASSEMBLY LAY-OUT
MODEL DISPLAY AS DIAGNOSTIC TEST
MODEL
DLE5977W/B
DLG5988W/B
DLE3777W
DLG3788W
OP 1
X
X
X
X
OP 2
X
X
X
X
OP 3
X
O
X
O
OP 4
O
O
X
X
OP 5
X
X
X
X
OP 6
X
X
X
X
6871EC1115A
6871EC1115B
6871EC1115C
6871EC1115D
18:FO
19:FO
18:F1
19:F1
OPTION PART LED
DISPLAY P/No

18
ELECTRIC DRYER WIRING DIAGRAM
WIRING DIAGRAM
8
GAS DRYER WIRING DIAGRAM

19
ACTIVATING THE DIAGNOSTIC TEST MODE
1. Unit must be in Stan by (unit plugge in, isplay off)
2. Press “POWER” while pressing “MORE TIME”, an “LESS TIME” simultaneously.
DIAGNOSTIC TEST
9
Pressing the
“START/PAUSE”
button
CHECKING
ACTION DISPLAY CHECKING POINT REMARK
None
Once
Electric control
&
Temperature
sensor
Motor
Won’t power up
Defective LED
Thermistor open
Thermistor close
Motor runs
Displays Moisture Sensor Operation:
If moisture sensor is contacte with
amp cloth. The isplay number is
below 180, in normal con ition.
70 ~ 239
Measure
Moisture Value.
Twice
ELECTRIC TYPE
Motor + Heater 1 (2700W)
GAS TYPE
Motor + Valve
Current Temp.
ELECTRIC TYPE : Heater runs
GAS TYPE : GAS Valve runs
(Display the Temperature of
Insi e rum.)
During check,
If the oor is close .
Motor on & Heater
Off + Lamp Off 70 ~ 239
• Press Start button 1 time an then open the
oor. Procee again with the step 1(by pressing
start 1 time), step 2(by pressing start 2 times),
step 3(by pressing start 3 times) an step 4(by
pressing start 4 times) in sequence.
•
Press Start 2 times an then open the oor. Procee
again from the step 1 all the way to the step 4.
• Press Start 3 times an then open the oor
Procee with the step 1 an skip the step 2 an
press step 3 twice an finish with step 4 by
making sure the all the electric evices shut off
in the en .
4 times Control Off Auto Off
3 times
ELECTRIC TYPE
Motor + Heater 1
+Heater 2 (5400W)
GAS TYPE
Motor Type
Current Temp.
(5 ~ 70)
During check,
If the oor is open.
Motor & Heater Off + Lamp On +
Buzzer beeps seven times
Door switch See test 6
Lamp
See test 1
Display : See page
See test 2
See test 3
See test 4
Gas valve
See test 7
1. This TEST should be used for Factory test /Service test. Do not use this DIAGNOSTIC TEST other than
specified.
2. Activating the Heater manually with the Door open may trip the Thermostat attached to the Heater, therefore do
not activate it manually. (Do not press the door switch to operate the heater while the door is open )