Mitsubishi Electric LOSSNAY VL-5050SR2-E Handbook page 16

No. Error
7 The front Are the Lossnay core and filters properly
panel cannot be installed? (Check the installation direc-
closed. tions and positions.)
8 Cold air or wind Are the shutters being kept open when
comes into the the fans are stopped?
room.
Basic checklist for the major components (Table 1)
No. Components
1 Motor
2 Switch with a pull
cord
(VL-50S -E only)
2
3 Display circuit
board
4 Main circuit board [1] Check the appearance.
Cause
Check the coil resistance.
Disconnect the following connector from the main circuit board, and then measure
the resistance between the motor lead wires.
VL-50S -E, VL-50ES
2
VL-50SR -E: CN2
2
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.
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
Red - White
Red - Blue
[1] Check the appearance.
• Check whether the circuit name is proper.
VL-50S -E, VL-50ES
2
VL-50SR -E: VL-36S
2
• 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-50SR
• 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.
• Check whether the circuit name is proper.
VL-50S -E, VL-50ES
2
VL-50SR -E: VL-36M
2
• 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))
Install the Lossnay core and filters properly.
Move the shutter knob to the CLOSE posi-
tion.
Judging instructions
-E: CN3
2
Operating mode
(fan speed)
High
Low
-E: VL-35-B
2
-E: VL-35-A
2
─ 16 ─
Action
Resistance
Short-circuited
-E only)
2