LG V-C7780CEV User manual

VACUUM CLEANER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
MODEL : V-C7780CEV
M
K
P/No. : MFL35720509
Internal Use Only
Website http://biz.lgservice.com

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CONTENTS
SAFETY PRECAUTIONS...............................................................................................................3
CAUTIONS......................................................................................................................................3
DESCRIPTION................................................................................................................................4
SPECIFICATIONS...........................................................................................................................4
DISASSEMBLY...........................................................................................................................5~6
TROUBLE SHOOTING GUIDE ..................................................................................................7~9
BLOCK DIAGRAM.................................................................................................................. 10
EXPLODED VIEW ..................................................................................................................11~13
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes

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SAFETY PRECAUTIONS
BEFORE OPERATING THIS VACUUM CLEANER, READ THIS SERVICE MANUAL THOROUGHLY,
AND OBSERVE EACH POINT CAREFULLY.
1. Motor filter(Air Cleaner)
1) This filter is reusable.
2) Never use the vacuum cleaner without filter.
It may damage the motor.
3) When the light of body is on, wash the motor filter
with water and brush.
4) Even if the light is not on, wash the motor filter at
least once 6 months.
NOTE : Reusing of the motor filter.
Never wash the filter in a washing machine or in a
dishwasher.
Never use hot water for washing the filter.
Reuse the filter after drying it completely in the
shade for a day.
Do not dry near fire or direct sunray.
2. Exhaust filter(Washable HEPA filter)
1) This filter is reusable HEPA filter.
2) For clean air, theis filter must be assembled.
3) Wash the exhaust filter with water once a year.
4) When the light of body is on, wash the exhaust filter with
water.
NOTE : Reusing of the exhaust filter.
Never wash the filter in a washing machine or in a
dishwasher.
Never use hot water for washing the filter.
Reuse the filter after drying it completely in the
shade for a half day.
Do not dry near fire or direct sunray.
Do not brush the filter. This will cause permanently
damage allowing dust to by-pass the filter.
3. Avoid suction such materials as :
1) Liquid or wet dust :
Clogs the ventilation holes, reduces the suction
power significantly and harms the motor.
2) Inflammable liquids such as benzene, alcohol or
solvents.
3) Burning objects such as cigarette butts.
4) Bulky objects such as vinyl, paper etc.
5) Sharp objects such as needles, pins, metal, glass
particles etc.
4. Attachments
Nozzle : For cleaning wooden floor, the room floor
and carpet.
Dusting Brush and Crevice Tool:
For cleaning any crevice, inside corners of window
frames.
For delicate vacuuming of fabrics on the furniture,
curtains, etc.
Upholstery Nozzle : For vacuuming the dust on the
upholstery.
However, do not use the crevice tool more than 20
minutes because it may cause harm to the motor.
5. Close supervision is necessary when this
vacuum cleaner is used by or near children.
Children’s carelessness may cause damage
to the cleaner or injure persons.
6. Air exhausted from the vacuum cleaner is
normally warm. But if extraordinarily hot air
is exhausted, check if the telescopic tube,
hose or clean filter is clogged or not.
7. Electric shock could occur if used outdoors
or on wet surfaces.
1. Motor exchange
1) Separate the Body Cover and Body Base by
unfastening the screws.
2) After disconnecting the lead wires, replace the old
motor with a new one.
2. In case of exchanging other parts. refer
to the exploded view.
CAUTIONS
BEFORE ATTEMPTING TO SERVICE OR ADJUST ANY PART OF THE VACUUM CLEANER, DISCONNECT
THE ELECTRICAL POWER SUPPLY CORD FROM THE WALL OUTLET.
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

DESCRIPTION
ATTACHMENTS
Motor Cover
Power Cord
Switch Button (ON/OFF)
V-C7760NT*/NE*/NTV*
Flexible Hose ASS’Y
Telesscopic
Pipe ASS’Y
Cord Reel Button
Dust Tank
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SPECIFICATIONS
•MODEL : REFER TO THE COVER PAGE
•POWER SOURCE : ON RATING PLATE
•POWER CONSUMPTION : ON RATING PLATE
•POWER CONTROL :
- MAIN : SLIDE CONTROL (F/HOSE)
(V-C7750HE*, V-C7760HT*/HE*, V-C7766HE*,
V-C7768HEU*)
MICOM CONTROL (F/HOSE)
(V-C7770CT*/CE*/CTV*/CEU*)
PUSH ON/OFF(BODY)
(V-C7760 NT*/NE*, V-C7765NT*/NTV* )
-SUB : VACUUM POWER ADJUSTMENT BY
SLIDE KNOB (NT*/NE*)
•CORD LENGTH : 7 m
•HOSE LENGTH : 1.8 m
•NET WEIGHT : 5.4 kg
•PACKING WEIGHT : 9.4 kg
•NET DIMENSION : 298 410 290 (W DH)mm
•PACKING DIMENSION : 330 565 330 (W DH)mm
•ATTACHMENTS
HOSE......................................................................... 1EA
TELESCOPIC PIPE ASSY ........................................ 1EA
NOZZLE ASSY...........................................................1EA
DUSTING BRUSH & CREVICE TOOL...................... 1EA
UPHOLSTERY NOZZLE ............................................1EA
BRUSH ASS’Y............................................................1EA
EXTRA AIR FILTER ...................................................1EA
•This specifications are subject to change according to the buyer's request.
DUSTING BRUSH & CREVICE TOOL
UPHOLSTERY NOZZLE
CANISTER
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes

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DISASSEMBLY
• Almost all of the parts of this vacuum cleaner can be
disassembled with a screw driver and each connecting
component easily fits each other.
Disassemble one by one referring to the exploded view.
•
If possible, don't disassemble except for the necessary
parts. It is not necessary to disassemble the parts that
are not detailed in the exploded view.
1. Body Cover Assembly Replacement
1) Remove the dust tank from the set.
2) Remove the four screws fastening the body base.
3) Disassemble the body cover, raising the body cover.
2. Motor Assembly Replacement
1) Detach exhaust cover in the direction of the arrow and
unhook the motor covr with “”driver.
2) Pull out the motor and disconnect the lead wires from it.
NOTE: Before attempting to service or adjust any part of the vacuum cleaner, disconnect the electrical power supply cord
from the wall outlet.
Motor Ass'y
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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3. Cord Reel Assembly Replacement
1) Lift the cord reel assembly from the body base.
4. Disassembly of Top Cover
1) Remove the three screws fastening the body cover and
top cover.
2) Unhook the two hooks with “ ” driver.
5. Disassembly of Body Base Assembly
1) Remove the two screws fastening, the motor housing
cover.
Cord Reel Ass'y
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes

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CHECKING
CHECK THE POWER
SOURCE The fuse is melt down in the
coverknife switch.
Exchange the fuse.
Poor plug insertion Insert again.
Power cord cut Repair or exchange.
Interior lead wire cut Exchange the lead wire.
Motor(stator, armature) coil
cut or damaged. Exchange the motor.
Poor contact carbon brush
defaced. Exchange or repair the motor.
Poor switch contact point
(V-C7760HT/HE, V-C7765HT/HTV)
Exchange the switch.
Motor armature cut. Exchange the motor.
Ball bearing defacement Exchange the motor.
Impeller hindrance
(Caused by foreign matters) Remove the foreign matters.
CAUSE SOLUTION
TROUBLE SHOOTING GUIDE
1. SWITCH ON BUT MOTOR DOSE NOT TURN.
2. SWITCH ON, MOTOR DOES NOT TURN BUT BUZZES.
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

-8-
Carbon brush defaced Exchange the carbon brush
or the motor.
Motor armature cut Exchange the motor.
Foreign matters attached to
the impeller Remove the foreign matters.
Low voltage Inquire to the power utility
company.
Hose and extension wands
are clogged with foreign
matters.
Remove the foreign matters
in the hose or extension
wands.
The slide knob on the handle is
opened or the control knob is
located on weak position.
Close the slide knob by sliding it.
Regulate the knob.
The motor filter is clogged. Clean the motor filter.
The exhaust filter is clogged. Exchange the exhaust filter.
Poor connection Repair the slide volume of hose
or triac of PWB assembly
Poor switch
(V-C7760NT/NE/NTV)
Low rotation speed
Motor turns normally,
but suction power is weak.
Exchange the switch.
3. SWITCH OFF BUT MOTOR TURNS
4. WEAK SUCTION POWER
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes

Loose parts Secure firmly.
Unbalanced motor assembly Exchange or repair the motor.
Foreign matters are attached
to the impeller. Remove the foreign matters.
Poor carbon brush rectification Exchange the motor.
Poor cord, lead wire Exchange cord, lead wire.
Poor rectification of
carbon brush Exchange the motor.
Poor electric connector or
receiver Repair the electric connector or receiver.
Poor capacitor Exchange the capacitor.
Bent connection parts Exchange the parts.
Poor connection
(Caused by foreign matters) Remove the foreign matters and reconnect.
Armature is cut or foreign
matters attached. Exchange the motor Remove foreign matters.
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5. VIBRATION NOISES
6. RADIO, TV RECEPTION DISTURBANCE
7. IMPROPER TUBE OF NOZZLE CONNECTION
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

-10-
CIRCUIT DIAGRAM
BLOCK DIAGRAM
SCHEMATIC DIAGRAM
SLIDE VOLUME
LED PWB ASM
PRESSURE
S/W
SUB
PWB
ASM
MAIN
PWB
ASM T/P
BK BK
GY
BL
BL BL
GY
BK
GY
BK
RD
BL
GY
GY
SLIDE VOLUME
LED PWB ASM
PRESSURE S/W
SUB
PWB
ASM
MAIN
PWB
ASM
M
T/P
BK BK
GY
BL
BL BL
GY
BK
GY
BK
RD
BL
GY
GY
MOTOR
BD1
C1
0.47uF
/AC250
R10
470K
1/2W
R10-1
470K
1/2W
R12
5.6K
C4
2200uF
25V
C3
0.47uF
/100V
D6
1N4002
IC2
R14
1K
R9
100
R15
24K
S/VOL
R5
100
D5
1N4148
Q2
A1015
Q1
C3198
R7
11K
R6
18K
IC1
1
2
6
4
1
LED1
2
6
4
R4
11K
R3
470
1/2W
T2
T1
G
R2
330
1/2W
VR1
20K
R8
1K
M
+
TRANS
P - S/W
OPTO-TRIAC
OPTION
OPTO-TRIAC
T/P
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes

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LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
EXPLODED VIEW BASE ASSEMBLY, BODY
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Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purposes
COVER ASSEMBLY, BODY

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M1
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ACCESSORIES
Copyright © 2007 LG Electronics. Inc. All right reserved.
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Only for training and service purposes
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