Troubleshooting Procedures - Mitsubishi Electric MA-E85R-E Service Manual

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Instruction manual (80 pages)

Table of Contents

11 . Troubleshooting Procedures

(1) Symptoms and Remedies

Symptom

1. Blower fan

(motor) does not

rotate (power

does not turn

ON).

2. Dust is not

collected (air

volume is low).

3. Deodorizing is

not performed

(deodorizing

performance is

low).

4. The odor monitor

does not work.

5. The PM2.5

monitor or dust

monitor does not

work.

6. The cleaning

mechanism locks

up.

Check Item

Is an operation mode lamp

or air volume lamp lit when

you turn ON the "On/Off"

switch?

Lit

• How to determine whether the DC motor has a malfunction

The following table shows the values for a normal motor that was measured with a

multimeter.

The motor has a malfunction if any value is very different from the normal value.

Measurement method (pin number of P4 connector)

Tester + terminal

Tester - terminal

Pin 1 (red)

Pin 4

Pin 6 (white)

Pin 4

Pin 7 (yellow)

Pin 4

Pin 8 (blue)

Pin 4

Pin 4 (black)

Pin 1

Any pin

Outer casing of motor

The above is the diagnostic method for when the motor is isolated.

Regardless of the rotation state, do not test the motor when the connectors are connected.

Is the pre-filter clogged with

dust?

Is the HEPA filter

replacement lamp lit?

Lit

Place perfume, hair tonic,

alcohol for disinfection, or

the like in front of the unit

and check the response.

Was there no response?

Rub tissue paper for 20 seconds

and check the response. Was

there no response?

Is the blue tape for

packaging attached to the

dust box?

Check the continuity of the current fuse.

Not

Check the connection cables and connectors

lit

of the display operation circuit board and

power supply control circuit board.

Check the output voltage at the connector

P4 of the power supply control circuit

board after turning ON the "On/Off" switch.

If 310 VDC is not output normally between

pins 1 and 4, 15 VDC is not output normally

between pins 6 and 4, and 1 to 6 VDC is

not output normally between pins 7 and

4, replace the power supply control circuit

board. If the voltages are output normally,

replace the blower motor (pin 4 is GND).

Tester measurement mode Normal value

Resistance

Diode

Resistance

Remove the dust (clean the pre-filter and

HEPA filter).

Replace the HEPA filter with a new one.

Soak and wash the activated charcoal

Not lit

filter.

Replace the activated charcoal filter with a

new one.

Replace the odor sensor.

YES

* Response will be slow immediately after the

"On/Off" switch is turned ON because the

odor sensor is performing the preparation

operation. Perform operation for about 5

minutes and then perform the check.

Replace the dust sensor.

YES

Peel off the blue tape.

YES

Remedy

Malfunction diagnosis

Infinity