Mitsubishi Electric VL-50S2 User manual

Warning:
Repair work must be performed by the manufacturer, its service
agent or a similarly qualified person in order to avoid hazards.
LOSSNAY
HANDBOOK
MODELS
VL-50S2-E
VL-50ES2-E
VL-50SR2-E
Nameplate
July 2017 No. U224-A
Filter (Optional)
P-50F2-E
P-50HF2-E
Pipe (Optional)
P-50P-E
P-50PJ-E
Hood (Optional)
P-50VSQ5-E

Contents
1. Safety precautions .................................................................... 3-4
2. Changed points ........................................................................... 4
3. Names and functions of components .......................................... 5
4. Specifications ............................................................................... 6
5. Outside dimensions................................................................... 7-8
6. Electrical wiring diagrams ............................................................ 9
7. Circuit board diagrams ..........................................................10-11
8. Principles of operation ............................................................... 12
9. Troubleshooting
.................................................................... 13-17
10. Before receiving repair requests ............................................... 17
11. Service inspection list ................................................................ 18
12. Overhauling procedures ....................................................... 18-31
12-1 VL-50S2-E, VL-50ES2-E .................................................................... 18-24
12-2 VL-50SR2-E ...................................................................................... 25-31
13. Parts catalog ......................................................................... 32-44
VL-50S2-E....................................................................... 33-36
VL-50ES2-E .................................................................... 37-40
VL-50SR2-E .................................................................... 41-44

─3 ─
Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a
safe manner.
The types and levels of danger that may arise if the product is handled incorrectly are described with the warning
symbols shown below.
Modification is prohibited
Do not modify the unit.
( Failure to observe this warning may
result in electric shock, fire and/or injury. )
Electric shock
If you must inspect the circuitry while the power is
on, do not touch the live parts.
(Failure to observe this warning may
result in electric shock.)
Check insulation
Upon completing repair work, always measure the
insulation resistance. Verify that it is at least 10 MΩ
(with a 500 V DC insulation resistance tester), and
then turn on the power.
(Inadequate insulation may result in
electric shock.)
Improper handling of the product may
result in serious injury or death.
Improper handling of the product may result in slight injury
or damage to properties including buildings and equipment.
Proper electric work
Use the electric wires designated for electric work,
and conduct electric work in accordance with your
local electric work regulations and the installation
manual.
(Improper connection or wiring installation
may result in electric shock and/or fire.)
Replace damaged and/or degraded parts
Be sure to replace the power cord and lead wires if
they are damaged and/or degraded.
(Failure to observe this warning may
result in electric shock and/or fire.)
Use proper parts and tools
For repair, be sure to use the parts listed in the parts
catalog of the applicable model and use the proper
tools.
(Failure to observe this warning may
result in electric shock, fire and/or injury.)
Turn off the power supply
Be sure to unplug the power cord, or shut off the
circuit breaker before disassembling the unit for
repair.
(Failure to observe this warning may
result in electric shock.)
Make sure that the product operates properly upon completion of repair. Clean the product and the surrounding
area, and then notify the customer of the completion of repair.
Caution for injury
Do not work at a location where you do not have a
sure footing.
( Failure to observe this caution may result
in a fall. )
Notes for servicing
● Make sure that an earth leakage breaker and an overload protection device are installed, if they are not in-
stalled, recommend the customer to install one.
Wear gloves
Wear a pair of gloves when servicing.
(Failure to observe this caution may
result in injury to your hands from sharp
metal or other edges.)
1. Safety precautions
Warning
Caution
Caution against
electric shock
Prohibited
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Prohibited

─4 ─
Precautions for soldering
Lead-free solder is used for the circuit boards of this product, and " " is marked on the circuit boards.
Observe the following precautions.
●When making repairs on these circuit boards, lead-free solder must be used.
●Make sure to use dedicated soldering irons to lead-free solder. (Do not use soldering irons that are used for
Sn-Pb [tin-lead] eutectic solder)
●It is recommended to use soldering irons having power consumption of 40 W or more.
2. Changed points
Item New model Previous model
VL-50SR2-E VL-50S2-E VL-50ES2-E
Operation
means
Remote controller
Pull cord switch Control switch
(Wall switch)
Shape of
main circuit
board
80x129 mm 80x80 mm
Wiring for
terminal
block
Two wires Three wires
Terminal blockPower cable
L
Terminal blockPower cable
Display
Display
Operation lamp
Operating mode
selection switch
Remote controller
receiver
Pull cord
(VL-50S2-E only)
Display
Operation lamp

─5 ─
3. Names and functions of components
Hook
Panel
<Front panel>
Outside air filter
<Filter>
Exhaust air filter
<Filter>
Operation lamp
Wire (fall prevention)
Lossnay Core
(Heat exchanger)
Shutter knob
Pull cord
<Switch>
(VL-50S2-E only)
Display
(Remove the provided
protective sheet.)
Vertical mounting joint C
<Joint pipe>
Air supply/exhaust pipes A
<Pipe> (2 pcs.)
Joint pipe B
<Joint pipe>
Weather cover
Remote controller
(VL-50SR2-E only)
Note:
The names in the angle brackets < >
show the part names in the parts catalog.
About the filters Features
Exhaust air filter
For
Exhaust
air
The filter prevents clogging of the internal compo-
nents.
Outside air filter
(Replacement filter: P-50F2-E)
For
Supply
air
When Lossnay takes in outside air to a room, the
filter collects dust, sand, pollen or the likes from
outside air.
Note: Some fine particles or tiny insects may pass
through the filter. The high performance filter
is recommended for higher collecting effect.
Outside air filter can be replaced with the following high performance filter.
High performance
filter
(Optional parts)
(P-50HF2-E)
For
Supply
air
The filter collects dust more efficiently than the
outside air filter.

─6 ─
4. Specifications
Model Supply
voltage (V)
Frequency
(Hz) Notch
Power
consumption
(W)
Air volume
(m3/h)
Temperature
exchange efficiency
(%)
Noise
(dB)
Weight
(kg)
VL-50S2-E
VL-50ES2-E
220 50 HI 19 51 70 36.5
6.2
LO 4 15 86 14
230 50 HI 20 52.5 69 37
LO 4.5 16 85 15
240 50 HI 21 54 68 37.5
LO 5 17 84 15.5
220 60 HI 21 54 68 37.5
LO 5.5 17 84 15.5
VL-50SR2-E
220 50 HI 19 51 70 36.5
6.2
LO 4.5 15 86 14
230 50 HI 20 52.5 69 37
LO 5 16 85 15
240 50 HI 21 54 68 37.5
LO 5.5 17 84 15.5
220 60 HI 21 54 68 37.5
LO 6 17 84 15.5
* Noise values may be higher than those listed depending on the structure of the room.

─7 ─
5. Outside dimensions
VL-50S2-E, VL-50ES2-E, VL-50SR2-E
198.5
φ180
108
109
96.5
40
198.5
28
φ
180
108
109
168
2°
522
φ114
245
Air supply/
exhaust hole
Air supply
hole
Air supply
hole
Power cable
(VL-50S2-E only)
Pull cord
(VL-50S2-E only)
Pull cord
Display
Weather cover
Mounting plate
Mounting plate
Weather cover
Air supply/exhaust
pipe
Air supply/exhaust
pipe
Shutter knob
Shutter
knob
Indoor air
exhaust hole
About 400
Indoor air
exhaust hole
Indoor air
exhaust hole
Indoor air
exhaust hole Wall thickness
50 to 650
Wall
thickness
120 to 730
For horizontal mounting
For vertical mounting
151.5
223.5
216
245
40.539.5
21 11.5
26.5
20×8＝160
300
200
184
210.5 522
182 193
310 360
125
Mounting plate
Center line
Air supply/exhaust
hole
(ø120 wall hole)
Mounting plate temporary
fixing hole position (For horizontal mounting)
Unit hanging screw position
ŶMounting position diagram (seen from inside)
(For horizontal mounting)
Edge of main unit Mounting hole 53 – ø6
Power and connection
cable pullout area
(VL-50ES2-E only)
min. min.
min. min.
Power cable
(VL-50S 2 -E only)
Mounting plate
temporary fixing hole
position
(For vertical mounting)
Unit hanging screw
position
(For vertical mounting)
(VL-50S2-E only)
Display
(The figure shows
VL-50S2-E/VL-50ES2-E.)
Attach the twisted part of
the vertical mounting joint C
toward the indoor side.
* For vertical mounting, the
display comes to the lower
side. (The unit cannot be
mounted upside down.)
ŶRemote controller
(VL-50SR2-E only)
1054
88
Unit (mm)

─8 ─
P-50F2-E
154
76
13
Unit (mm)
P-50HF2-E
153
76
8
Unit (mm)

─9 ─
6. Electrical wiring diagrams
(1) Switch wiring diagrams
VL-50ES2-E
Terminal block Switch Circuit breaker
220/230/240 VAC 50 Hz
220 VAC 60 Hz
Red
White
Blue
VL-50SR2-E
Terminal block Circuit breaker
220/230/240 VAC 50 Hz
220 VAC 60 Hz
Red
White
(2) Motor coil diagram
VL-50S2-E, VL-50ES2-E, VL-50SR2-E
Coil resistance at a temperature of 30°C
0FRLOȍ6FRLOȍ
Red
Black
White
Thermal fuse
145Υ

─10 ─
(2) VL-50ES2-E (Wall switch type)
7. Circuit board diagrams
Circuit board diagrams and check points
(1) VL-50S2-E (Pull cord type)

Switch with a pull cord
Motor 
Phase advance capacitor
2 ȝF
Voltage-dividing capacitor
ȝ)ȝ)


＜Main circuit board＞
VL-35-A
＜Display circuit board＞
VL-35-B
Blue
White
Red
Not in use
220/230/240 VAC 50 Hz
220 VAC 60 Hz
AC power supply input
White connector
Power cord
White connector
White connector
White connector
Operation lamp
(green)
Blue
White


Motor 

Not in use

Terminal block
Control switch
White connector
White connector
Red
Operation lamp
(green)
＜Display circuit board＞
VL-35-B
＜Main circuit board＞
VL-35-A
Not in use
Phase advance capacitor
2 ȝF
220/230/240 VAC 50 Hz
220 VAC 60 Hz
AC power supply input
Voltage-dividing capacitor
ȝ)ȝ)
White connector

─11 ─
(3) VL-50SR2-E (Remote controller type)
12 V DC
(J6)
GND
(J10)
5 V DC
(C12 (+))
Operating mode
selection switch
Remote control
signal receiver IC
High operation lamp
(Green)
Low operation lamp
(Green)
＜Main circuit board＞
VL-36M ＜Display circuit board＞
VL-36S
Terminal
block
220/230/240 VAC 50 Hz
220 VAC 60 Hz
AC power supply input
White connector
Motor
White connector
White connector
Phase advance capacitor
2 ȝF
Voltage-dividing capacitor
ȝ)
(1ȝF and 2ȝF capacitors in series)
Blue connector

─12 ─
8. Principles of operation
(1) VL-50S2-E (Pull cord type)
• Operating mode (fan speed) can be switched from HI (High) to LO (Low) to OFF by using the switch with a
pull cord.
<Lighting status of the operation lamp under each operating mode>
Operating mode of the fan OFF HI LO
Operation lamp (LED1) Off Lit Lit
(2) VL-50ES2-E (Wall switch type)
• Operating mode (fan speed) can be switched by using the control switch. Operations may vary depending
on the switches installed.
220/230/240 V is applied between HI and COM2 HI (High)
220/230/240 V is applied between LO and COM2 LO (Low)
<Lighting status of the operation lamp under each operating mode>
Operating mode of the fan OFF HI LO
Operation lamp (LED1) Off Lit Lit
(3) VL-50SR2-E (Remote controller type)
• Operating mode (fan speed) can be selected from HI (High), LO (Low), and Power ON/OFF by using the
remote controller.
• Operating mode (fan speed) can be switched from HI (High) to LO (Low) to OFF by using the operating
mode selection switch on the main unit.
<Lighting status of the operation lamps under each operating mode>
Operating mode of the fan OFF HI LO
Operation lamp (LED201) Off Off Lit
Operation lamp (LED202) Off Lit Off

─13 ─
9. Troubleshooting
Work precautions
• When servicing, be sure to recreate the malfunction two or three times before starting repairs.
• When servicing, always take care to keep proper footing.
• Before starting the service, always unplug the power cord from the outlet, or turn off the circuit breaker
when no power cord plug is provided. Sufficient care must be taken to avoid electric shock or injury.
• Make sure to connect the power supply wires correctly.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• When circuit board failure is considered to be a cause, check closely for any broken section on the copper
foil patterns, burning or discoloration of parts.
• After replacing a circuit board, make sure to restore the same settings as before the replacement.
The part names in the text are standardized with the part names in the parts catalog. (There are some
exceptions.)
(1) Service Flowchart
After checking the preliminary check items below, follow troubleshooting 1 and 2 for servicing.
Preliminary check items
1. Condition of trouble
2. Frequency of trouble:
The date of starting
operation and occur-
rence of trouble
Troubleshooting 1 Lossnay does not operate, or it stops by itself.
Check (2) Initialization checklist.
Troubleshooting 2 Lossnay operates abnormally.
Check (3) Lossnay checklist.
Check "10. Before receiving repair requests."

─14 ─
Troubleshooting 1 Lossnay does not operate, or it stops by itself.
(2) Initialization checklist
No. Error Cause Action
1 Lossnay does
not operate.
<VL-50S2-E>
• Is the power plug connected to the
power source of the rated voltage?
<VL-50ES2-E, VL-50SR2-E>
• Is the rated voltage 220/230/240 VAC
supplied to the terminal block?
Supply the rated voltage 220/230/240 VAC.
If a power failure has occurred, wait for power
failure recovery.
Check that the circuit breaker is ON.
<VL-50ES2-E, VL-50SR2-E>
Are there any poor connections of the
terminal block?
Connect the lead wires securely.
<VL-50S2-E, VL-50SR2-E>
Is the following power supply connec-
tor on the main circuit board securely
connected?
VL-50S2-E: CN2
VL-50SR2-E: CN1
Connect the connector securely.
Is the current fuse on the main circuit
board blown?
If the current fuse is blown, determine the
cause of the failure (abnormal voltage applica-
tion or wrong connection), and eliminate the
cause. Then, replace the main circuit board
together with the display circuit board.
Are there any problems with the main
circuit board or display circuit board?
Diagnose the problems of the circuit boards
by checking the Basic checklist for the major
components (Table 1). (See page 16.)
<VL-50S2-E>
Is the power cord properly plugged into
the wall outlet?
Plug the power cord properly.
<VL-50S2-E>
Is the switch with a pull cord turned
ON?
Turn ON the switch with a pull cord.
<VL-50SR2-E>
Is the battery exhausted? Replace it with a commercially available lithium
battery (CR2025).
<VL-50SR2-E>
• Is the remote controller operated at
the position too far away from the
main unit?
• Is the remote controller case installed
outside the remote control signal
receiving range?
The remote control signal receiving range is
shown below.
45°
45°
45° Receiver
Downward: 3 m
Left: 3 m
Front: 4 m Right: 3 m
2 Lossnay stops
by itself.
<VL-50ES2-E, VL-50SR2-E>
Are there any poor connections of the
terminal block?
Connect the lead wires securely.
Are there any problems with the main
circuit board or display circuit board?
Diagnose the problems of the circuit boards
by checking the Basic checklist for the major
components (Table 1). (See page 16.)

─15 ─
Troubleshooting 2 Lossnay operates abnormally.
(3) Lossnay checklist
No. Error Cause Action
1 The shutters
do not open or
close.
Is there any foreign matter or obstruction
around the shutters?
Remove it.
Are the shutters detached from guide rails
of the casing?
Attach the shutters properly.
2 The fans do not
rotate.
Are the following connectors on the main
circuit board securely connected ?
VL-50S2-E, VL-50ES2-E: CN3, CN4, CN5
VL-50SR2-E: CN2, CN3, CN4
Connect the connectors securely.
Do the fan blades touch other compo-
nents?
Check for any abnormal area.
Replace any abnormal or defective parts.
Is there any foreign matter around the fans? Remove it.
Are there any problems with the motor? Diagnose the problems of the motor by
checking the Basic checklist for the major
components (Table 1). (See page 16.)
Is the voltage 220/230/240 V AC output
from the main circuit board?
Disconnect the following motor connector to
check the output voltage.
VL-50S2-E, VL-50ES2-E: CN3
VL-50SR2-E: CN2
(See page 16.)
3 The fans do not
stop.
<VL-50S2-E>
Do the fans continue operating even if the
switch with a pull cord is turned OFF?
If the fans do not stop operating, replace the
switch.
4 Operating mode
(fan speed) can-
not be switched.
<VL-50S2-E>
Is the switch with a pull cord caught on
some components?
Eliminate the cause of catching.
<VL-50S2-E>
Does the switch with a pull cord work
properly?
Operate the switch to check whether it ob-
tains click feeling. If there are any prob-
lems, replace the switch.
Are there any problems with the main
circuit board or display circuit board?
Diagnose the problems of the circuit boards
by checking the Basic checklist for the major
components (Table 1). (See page 16.)
5 An unusual
noise comes
from the fans.
Is there any foreign matter around the fans? Remove it.
Are there any odd feelings when rotating
the fan?
If there are any odd feelings, replace the
motor.
Does the motor generate abnormal
noise?
Diagnose the problems of the motor by
checking the Basic checklist for the major
components (Table 1). (See page 16.)
Are the Lossnay core and filters properly
installed? (Check the installation direc-
tions and positions.)
Install the Lossnay core and filters properly.
6 The operation
lamp does not
illuminate.
Is the LED on the display circuit board
tilted?
Attach the LED case cover so that the LED is
positioned in the hole of the LED case cover.
Is the following connector on the display
circuit board securely connected?
VL-50S2-E, VL-50ES2-E: CN1
VL-50SR2-E: CN201
Connect the connector securely.
Are there any problems with the main
circuit board or display circuit board?
Diagnose the problems of the circuit boards
by checking the Basic checklist for the major
components (Table 1). (See page 16.)

─16 ─
Basic checklist for the major components (Table 1)
No. Components Judging instructions
1Motor Check the coil resistance.
Disconnect the following connector from the main circuit board, and then measure
the resistance between the motor lead wires.
VL-50S2-E, VL-50ES2-E: CN3
VL-50SR2-E: CN2
See Chapter 6. (2) Motor coil diagram (page 9) for the resistance values.
In the case of an open circuit or short circuit, replace the motor.
2 Switch with a pull
cord
(VL-50S2-E only)
Remove the switch from the main unit. Measure the resistance at the weld for the
wire connection on the backside of the switch.
If the resistance differs from the values listed below, replace the switch.
Color of wires Operating mode
(fan speed) Resistance
Red - White High Short-circuited
Red - Blue Low
3Display circuit
board
[1] Check the appearance.
• Check whether the circuit name is proper.
VL-50S2-E, VL-50ES2-E: VL-35-B
VL-50SR2-E: VL-36S
• Check if any parts are damaged.
• Check if any parts are stained with sticking liquid or the like.
• Check if the solder is cracked.
• Check if the circuit board is cracked.
[2] Check the operating mode selection switch (VL-50SR2-E only)
• Are the connectors CN201 on the display circuit board and CN103 on the main
circuit board securely connected?
• If the operating mode selection switch does not work, even though the remote con-
troller is operable, replace the display circuit board together with the main circuit
board.
If any of the above items is not satisfied, replace the display circuit board together
with the main circuit board.
4 Main circuit board [1] Check the appearance.
• Check whether the circuit name is proper.
VL-50S2-E, VL-50ES2-E: VL-35-A
VL-50SR2-E: VL-36M
• Check if any parts are damaged.
• Check if any parts are stained with sticking liquid or the like.
• Check if the solder is cracked.
• Check if the circuit board is cracked.
• Check if the varistors NR1 and NR2 are damaged.
(If they are damaged, it is due to application of an abnormal voltage. (Wrong instal-
lation work))
No. Error Cause Action
7 The front
panel cannot be
closed.
Are the Lossnay core and filters properly
installed? (Check the installation direc-
tions and positions.)
Install the Lossnay core and filters properly.
8 Cold air or wind
comes into the
room.
Are the shutters being kept open when
the fans are stopped?
Move the shutter knob to the CLOSE posi-
tion.

─17 ─
10. Before receiving repair requests
No. Components Judging instructions
4 Main circuit board [2] Check the motor drive.
• Motor: Measure the voltage between the pins of the following connector.
VL-50S2-E, VL-50ES2-E: CN3
VL-50SR2-E: CN2
At high fan speed output: Between 1 and 5 pins: 220/230/240 V AC ± 5 V
At low fan speed output: Between 1 and 5 pins: 80 V AC or more
For details of the above checkpoints, see Chapter 7. Circuit board diagrams.
If any of the above items is not satisfied, replace the main circuit board together with
the display circuit board.
5 Remote controller
(VL-50SR2-E only)
• Check if the battery is old. (Battery voltage 2.9 V or more is required.)
• If the remote controller does not work, even though the operating mode selection
switch is operable, the remote controller might be broken.
(Take a digital photo of the transmitter part on the remote controller to check
whether infrared rays are emitted from the remote controller.)
Frequently asked question Response
The incoming air feels cold. Has the outside air temperature dropped?
If the outside air temperature has dropped, switch the operating mode to
"Exhaust only mode," or stop the operation and close the shutters.
When switching the operating
mode or adjusting the shutter knob,
there is a noise inside the product.
This sound is the operation sound of the motor or shutters in the product.
It is not a malfunction.
The product does not operate. [1]
The power plug is almost detached from the wall outlet. (VL-50S2-E only)
[2] The circuit breaker on the distribution board is OFF.
[3] A power failure has occurred.
The operation sound becomes
louder.
[1] If the front panel or the filters are almost detached (or tilted), reinstall
them properly.
[2] If the shutters are closed, adjust the shutter knob to the OPEN position.
[3] If the filters are clogged, clean them in accordance with the operating
instructions.
The air volume is low. If the filters are clogged, clean them in accordance with the operating
instructions.
No air is coming from the product.
Not much air is coming from the
product.
If the shutters are closed, adjust the shutter knob to the OPEN position.
The front panel cannot be closed. If Lossnay core and filters are not properly installed, reinstall them prop-
erly. (For example, a component is out of position or inserted backwards.)
When adjusting the shutter knob,
there is a noise inside the product.
This sound is the operation sound of the shutters in the product. It is not a
malfunction.
Cold air or wind comes in more
than usual when the product is
stopped.
If the shutters are being kept open, adjust the shutter knob to the CLOSE
position.
Operation sensitivity of the re-
mote controller is low.
(VL-50SR2-E only)
[1] Check if the battery is weak. (Replace it with a commercially available
lithium battery (CR2025).)
[2] Check if the remote controller is operated at the position too far away
from the product, or at the improper angle. (See page 14.)
[3]
Operation sensitivity of the infrared remote controller can be affected by
strong light such as sunlight or room illumination. It is not a malfunction.
[4] Electromagnetic waves can affect the operation sensitivity at the loca-
tions in close proximity of electronic devices such as a television. It is
not a malfunction.

─18 ─
Location Inspection Item Check Result
Electric
wiring
Are the power lead wires securely connected to the terminal block?
(VL-50ES2-E and VL-50SR2-E only)
Is the wiring correct?
Appliance
Is the product securely mounted?
Does Lossnay operate as described in the operating Instructions when operating the switch?
Is the fan rotating?
Are the connectors securely connected?
Do the shutters work?
Does Lossnay operate without abnormal vibration or noise?
11. Service inspection list
Front panel
Hook
Wire
Front panel
Wire
Hook
Front panel
Front panel
12-1 VL-50S2-E, VL-50ES2-E
(1) Turn off the power.
[1] Stop the operation by turning off the switch.
[2] Turn off the circuit breaker on the distribution board, or unplug the power cord.
12. Overhauling procedures
Work precautions
• Before replacing parts, follow the instructions described in the troubleshooting.
• When servicing, always keep proper footing.
• When servicing, always unplug the power cord from the outlet, or turn off the circuit breaker. Pay sufficient
attention to avoid electric shock or injury.
• Always connect the power wires properly.
• Pay attention not to drop the parts or components.
• After completing repairs, check that the product operates properly.
Always wear a pair of gloves when servicing.
The part names in the text are standardized with the part names in the parts catalog. (There are some exceptions.)
Precautions
• When removing the front panel from the main unit, hold the hook to disengage the wire.
• Do not shake the suspended front panel. (The wallpaper could be damaged.)
(2) Remove the front panel.
[1] Hold both ends of the front panel, and pull it forward.
[2] Suspend the detached front panel by using the wire.
<When the unit is installed vertically><When the unit is installed horizontally>

─19 ─
Terminal block
Bush
Ground cable
Ground screw
Cord clamp
Lead-in opening
Power cable
Mounting
plate
Main unit
PCB case cover
* The figure shows VL-50ES2-E.
Reassembly precaution
Tightening torque for the screws: 1.1 N.m
Reassembly precaution
Tightening torque for the screws: 1.1 N.m
[2] Disconnect the power cable and ground cable
from the main unit.
Precaution
Pay attention to unhook the main unit from the
unit fixing screw (one special screw 4x10.5, indi-
cated by ) on the mounting plate.
[3] Unscrew the screws (four special screws 4x10.5,
indicated by ), and dismount the main unit.
For both models
(3) Dismount the main unit.
[1] Remove the PCB case cover.
Unscrew the screws (one PTT screw 4×8, indicat-
ed by , and one PP screw 3×8, indicated by ).
For VL-50ES2-E

─20 ─
ConnectorDisplay circuit board (VL-35-B)
LED case cover
LED case
Reassembly precaution
Tightening torque for the screw: 1.1 N.m
Reassembly precaution
Tightening torque for the screw: 0.7 N.m
Reassembly precaution
Securely connect the connector to the display
circuit board.
[3] Disconnect the connector from the display circuit
board, and remove the circuit board (VL-35-B).
(4) Remove the display circuit board (VL-35-B).
[2] Remove the LED case cover, and unscrew the
screw (one PPT screw 3x8, indicated by ).
[1] Unscrew the screw (one PTT screw 4x12, indi-
cated by ), and remove the display circuit board
parts together with the LED case cover and LED
case.