Oreck 8143 Manuale utente

Increase Quality Through Interaction with the Field

Increase Quality Through Interaction with the Field 1

The Oreck Manufacturing Company

8143 Air Purifier Tune-Up & Service Guide

07/20/2005

Compiled by Clark DeNoble

Increase Quality Through Interaction with the Field

Table of Contents

Tune-Up Pages 3-13

Check Housing Aesthetics and Structural Integrity Page 3

If Equipped: Check that the Louver Functions Smoothly Page 3

Check Fan Speed Switch and Motor Function Pages 3-4

Check the Status Light Function Pages 4-6

If Equipped: Check the Ionizer Switch Function Page 6

Check For Unusual Noises Pages 6-10

Thorough Washing Instruction Pages 8-10

If Equipped: Check Scent Cartridge Holder Function Page 10

Check the Safety Interlock Switch Function Page 10

Check the Structural Integrity of the Cell Pages 10-11

Clean Pages 11-12

Finishing Up Pages 12-13

Other Troubleshooting & Service Pages 13-21

Status Light Dead Pages 6

Nothing Works Pages 13-14

Lights Work Motor Doesn’t Pages 14-15

Remove and Replace Motor Pages 15-19

Cell High Voltage Circuit Board Replacement Pages 9-20

Circuit Diagram (10/20/03) Page 21

If the conditions are dry

enough even a cell this dirty

may not set off the red status

LED continuously.

Increase Quality Through Interaction with the Field 2

Increase Quality Through Interaction with the Field

Tune-Up

1. Check Housing Aesthetics and Structural Integrity

a. If you cannot see the blemish at arms length then it probably doesn’t matter

otherwise apply the following.

b. Hairline scratches:

i. Top & Sides-no more than 2, at ≤½”, on each surface.

ii. Rear & Bottom-no more than 3, at ≤1”, on each surface.

c. Gouges:

i. Top & Sides-none

ii. Rear & Bottom-no more than 2, at ≤¼”, on each surface.

d. Cracks:

i. No more than 2 total, at ≤¼”, per unit.

2. If Equipped: Check that the Louver Functions Smoothly

a. Operate the actuator back and forth.

b. Assure the louvers all move together at the same time.

3. Check the Fan Speed Switch and Motor Functions

a. Must function in all three positions.

b. Test whether the fan will bind in Silent. Unplug the unit and set the switch to silent.

Plug in the unit-the fan should start up.

c. If it doesn’t, first check for proper fan installation:

The fan grommet on the left is solid, has four

holding tabs, butts against the motor shaft’s

brass ring and must hold in this position to

provide clearance between the fan and fan

bushing grommet. This fan grommet must be

a tight fit to the motor shaft and free of

lubricants.

The grommet on the right is tiered, has four

holding tabs and envelops and holds onto the

motor shaft’s brass ring. As you can see if

this grommet is only butted against the brass

ring then the normal clearance between the

fan and fan bushing grommet shown in the

picture would be nonexistent. The reduced

clearance could cause screeching as the

grommet and fan touch.

d. Then check to see if the fan shaft and bearing are gummed up or worn:

Clean fan shaft and bearing. Apply oil to bearing assembly.

Increase Quality Through Interaction with the Field 3

Increase Quality Through Interaction with the Field

FYI-There is a felt behind the bearing. When you apply oil to the bearing hole

allow time for it to soak into the felt.

Fan Bearing

Assembly-

Front Oil Retention

Felt

Bearing Assembly Bracket

Felt Retainer

4. Check Status OK Light Function

a. Changes from red to green when the unit is turned ON.

b. If it stays RED then remove the cell, activate the unit.

c. If the light turns green then the cell was the problem (Red Status Light Due to Cell-

Additional).

d. If the light stays red then either the circuit area is wet, poor electrical contact between

the cell and HV contacts or HV assembly is defective.

You’ve washed, rinsed and dried the cell and the

Status light was still red.

2. Carefully pry up and remove the front plate

support bar and return cell to unit.

Note: Be sure to remember how the bar was

positioned on the cell plates.

1. Remove the cell and power up the unit. If the

Status light goes green then proceed to step

Note: If the Status light stays red see 4c.

3. If the Status light turns green then skip to step 9.

4. If the Status light turns red go to step 5.

5. Carefully pry up and remove the rear plate

support bar and return cell to unit.

Note: Be sure to remember how the bar was

positioned on the cell plates.

6. If the Status light turns green then remove

the cell from the unit and reinstall the first

support bar.

7. If the Status light stays green then that

support bar is good.

8. If the Status light turns red then remove the

support bar and proceed to step 9.

Increase Quality Through Interaction with the Field 4

Increase Quality Through Interaction with the Field

e. Some cells deeply burned/hidden carbon trails that cannot be scraped off or corona

wires that were stretched or broken. Replace the cell.

9. Take the bar/s and look for a carbon trail light

to dark brown or just discolored (circled).

This trail is often hard to see but it is

supplying an electrical path from a negative

plate to a positive plate (see arrows). This

electrical connection causes the Status light

to turn red.

10. Scrap off the carbon trail on one bar, reinstall

and test. If the Status light stays red then

remove the bar and scrap some more.

11. If the Status light turns green then go to work

on the other bar (if there is one) and repeat

step 10.

f. Red Light due to arcing or carbon trails at the cell contact board.

Picture 1 shows the arc in progress.

Picture 2 shows the carbon trail formed by the arc. The carbon trail makes later

failure much easier, scratch it off.

g. If with the cell in, the status light constantly changes from green to red and back:

Either the HV conductor is not making good contact with the cell. Bending it out

usually does the trick.

h. There is arcing on the LED board due to post ionizer reaction with residue on the

housing. (See Thorough Washing Instruction).

Dry the slot and cell contact board before buying a new HV circuit

board (See pictures on page 19)

Increase Quality Through Interaction with the Field 5

Increase Quality Through Interaction with the Field

i. Status light function reversed:

Operates in reverse, when you turn the unit ON the Status light briefly shows green

then goes to red and when you turn the unit OFF the Status light fades from red to

green and goes out, then either the wiring is reversed or the LED board is defective.

j. Status light never comes on:

If the Status light doesn't light at all then either the LED board, transformer or HV

circuit board is defective (See Status Light Dead).

Status Light Dead

There may be a problem with the yellow step down transformer.

If the transformer passes this check then the problem is the LED board or the

whole LED HV circuit board assembly.

Select the 50 VAC scale on your Multimeter. Turn the unit ON.

Touch the meter leads to the two solder joints shown below. A good transformer will

put out 24VAC.

If you don’t see 24VAC, turn the unit OFF and scrape the solder joints to remove any

coating. Turn the unit ON and test again. If you still don’t measure 24VAC then the

transformer needs to be replaced

Important: If the transformer is bad the power to the cell will also

be OFF. Replace the bad transformer first and test before ordering

the LED or HV boards.

5. If Equipped: Check the Ionizer Switch Function

6. Check for Unusual Noises

a. Ticking

i. Unbalanced Fan-shaft tapping the brass bearing-). If you see a significant up

and down movement this may be the problem (replace the fan unless

twisted. (See Twisted Fan 6 a iv).

ii. Dry Felt/Bearing-no oil

iii. Cocked Bearing-straighten

Increase Quality Through Interaction with the Field 6

Increase Quality Through Interaction with the Field

iv. Twisted Fan- Determine if the fan is twisted (the blades should be

horizontal). You can untwist the fan by gently turning the ends so the blades

straighten out (this has eliminated ticking

v. Bent Fan-some service fans get bowed from either shipping damage or

mishandling-replace the fan

vi. Dry Motor Ball Bearings

There are a couple of ways to determine if it's the motor bearing:

• Take a long shaft screwdriver, put the blade against the bearing

housing then put your ear against the handle and listen.

• Remove the fan and hear if the noise continues.

Indicators

• No noise (the bearing is packed (greased) well and probably on

a new unit).

• Some very sporadic non-rhythmic bearing ticking only heard

using the screwdriver (normal).

• Then there's the “shaking ball bearings in a cup” noise (bearing

is dry-this is probably the condition that gives you the noise of

concern).

• Finally, f it sounds like gravel then the bearings are already

damaged.

Although not recommended, if you choose to repack the bearings, use high-

temperature grease, not automotive axle (stinky) grease.

b. Snapping behind the switch panel. Arcing at the LED board (may or may not cause

the Status light to flicker.

If the arcing stops when the ionizer is turned off then it is always due to

residue/moisture in the cell/fan portion of the housing including the ionizer needle

and bracket. This will require a thorough washing.

Increase Quality Through Interaction with the Field 7

Increase Quality Through Interaction with the Field

THOROUGH WASHING INSTRUCTION

1. REMOVE UPPER HOUSING

Turn the unit onto its’ backside.

Remove 9 screws.

2. REMOVE UPPER HOUSING

Tilt the upper housing off the lower

housing.

You may need to hold the fan- bushing

bracket down while removing the upper

housing.

Remove the fan and bracket.

3. REMOVE THE SAFETY INTERLOCK SWITCH

Loosen the switch panel from the

housing.

Push in the safety interlock switch

button and pull out the switch.

Disconnect the power cord connector

from the switch terminal.

4. FREE THE POWER CORD NEUTRAL LEAD

5. REMOVE THE TRANSFORMER

Find the wire butt connector that

secures five (5) wires together.

Often you can squeeze the connector

and release the wires otherwise you’ll

need to cut the connector as shown

and pull it off the wires.

Remove the two (2) screws that

fasten down the transformer.

Increase Quality Through Interaction with the Field 8

Increase Quality Through Interaction with the Field

6. REMOVE THE POWER SUPPLY

Remove the two (2) screws that fasten down the

power supply.

7. REMOVE THE MOTOR HOLD DOWN BRACKET

Remove the four (4) screws from the bracket.

Remove the bracket.

Remove the two (2) upper motor mounts

8. REMOVE THE IONIZER NEEDLE AND BRACKET

9. REMOVE THE IONIZER POWER SUPPLY AND MOTOR

10. REMOVE THE LOWER MOTOR MOUNTS

Remove one (1) screw from the ionizer needle bracket.

Remove the needle and bracket.

Remove one (1) screw from the ionizer power

supply.

Gently remove the switch panel, transformer, power

supply, motor and ionizer power supply with needle

from the lower housing.

Increase Quality Through Interaction with the Field 9

Increase Quality Through Interaction with the Field

11. REMOVE THE POWER CORD

Remove two (2) screws.

Remove the cord clamp.

Remove the cord.

12. CLEAN AND REASSEMBLE

CAUTION DO NOT USE:

Solvent Spot & Stain Remover: liquefies the plastic.

1. Cleaning may involve just rinsing the

housings, fan and cell parts with hot water.

2. If a cleanser is used be sure to thoroughly

rinse with water (excessive residue may

cause arcing on the LED board.

3. The cell must be thoroughly dried or the

Status light will stay red and the cell plastic

might be burned.

4. Reassemble the unit starting with M in reverse

order.

5. At step 4

a. Strip the five (5) leads to expose ≈

½” of bare metal.

b. Twist the exposed wires together

clockwise (important if using a wire

nut).

c. Crimp on a wire but (shown) or twist

on a wire nut. Check that all the

wires are securely captured.

6. Tie the three (3) bundles together.

c. Rumbling

i. Worn fan grommet

ii. Unbalanced fan – remove fan if noise goes away it’s the fan

iii. Unbalanced motor – remove the fan if the noise continues it’s the motor

iv. Unit on an uneven surface

d. Screeching/Seal Bark

i. The fan is rubbing against the rubber fan bearing

7. If Equipped: Check the Scent Cartridge Holder Function

8. Check the Safety Interlock Function and Begin Cleaning Process

a. Leave the unit turned on, loosen the grill retainer screw, push in the actuator and

remove the grill-the unit should turn off.

b. If it doesn’t, replace the interlock switch.

c. Place the grill and place in a soap bath. Gently clean, rinse and dry.

Increase Quality Through Interaction with the Field 10

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