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tag Neptune MAH3000AWW Schematic

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    I Always disconnect electrical power to the washer I1 before beginning any service repair procedures. 1- < - -- - -

    General Operation DiagnosticsTroubleshooting: Washer Will Not Start- Confirm that the door shuts properly and closes the Door Switch button.- Check for 120 vac between the power cord neutral (whkte wire no. 13)and the Push to Start Switch (gray wire no. 26)only when the Door Switch button is pressed in.- Check the wiring a t the Door Switch and Push to Start Switch.- Replace the Door Smtch.- Check for 12 0 vac between the power cord neutral (white wire no. 13) and the Machine Control (black wire no. 27 ) onthe relay COM terminal only when the Door Switch button is pressed in and the Bush to Start button is pressed in.

    Check afso for 120 vac between the power cord neutral (white wire no.13)and the Machine Control (red wire no. 28on connector PI) only when the Door Switch button is pressed in and the Push to Start button is pressed in.- Replace the Machine Control if 120 vac is present in both places.- Replacethe Push to Start Switch if 120 vac is not present in either place.

    Troubleshooting: Washer Immediately Shuts Off when the Push to Start Switch isReleased- Check for loose wiring on the 'Machine Control relay GOM and NU terminals.- Check for a stuck relay on the Machine Control.Troubleshooting:Washer Fills but WillNot Tumble- Checlr to make sirre the Drsve Be?Eha s not come off of the Motor and Pulley, Reposition the Dr~ve elt ~fneeded.- Check the wlrlng dt the Machine Control.- Check the wiring between the Machine Control (Connector P4 ) and Motor Control (Connector JP4) and between theMotor Control (6 phase wires and the 3-position connector) and Motor (6- and 3-position connectors).- Perform the Drive System Diagnostic Test.Troubleshoating:Washer Tumbles but Will Not Fill- Are the water valves open and the fill hoses unkinked?- Check for proper water pressure (above 15 psi)?- Check the wising at the Timer, Machine Control, Pressure Switch, and Water Valves.- Check for proper rout~ng nd connection of the Air Dome Hose.- Confirm that there is no water visible in the Spinner.- Unplug the washer power cord, set the Tmes Knob lnto a wash increment, and check for continuity from Timercontact 72-T (blue wire no. 32) to Pressure Switch terminal 1 {blue wire no. 32)- hen to Pressure Switch terminal 12(purplewire no. 34), hen to Machine Control PI - l (purplewire no. 34).- Replace the Pressure Switch if there is no continuity across terminals 11 and 12.

    - R e p a ~ r r replace the wire harness if continuity is lost along any wire.- Close the console, set the Tmer Knob into a wash increment, select the HotlCold water temperature sefting, plug thewasher power cord Into the wall socket, and start te washer. Check for 120 vac across the hot water valve. Selectthe ColdlCold water temperature setting andcheck for *120 ac across the cold water valve.- Replace the Water Valve if 120vac is present when each Water Valve is checked.- Replace the Machine Control if 12Qvac is not present when each Water Valve is checked.

    Troubleshooting: Washer Spins when it Should Tumble- Check the wiring beheen the Machine C0ntrd (Connector P4) and the Motor Control (Connector JP4). Ff the 3-wiretachometer circuit between the Machine Control and Matw Control is open, th e washer will accelerate rapidly for 2seconds before the Machine Control shuts down.- Repair or replace th e main wire harness if continuify is lost along any wire.- Perform the Drive System Diagnostic Test.

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    General Operation Diagnostics - continuedTroubleshooting: Washer Will Not Reach Top Spin Speed- If the clothing load I S out of balance, the washer may l i rn~the top spin speed below the maximum speed. This isnomlal behavior.- If th e user had selected the Easy Carelperm Press, Delicates, or Hand Washables cycles, the washer will limit the to pspin speed below the maximum speed. This is also normal behavior.- If the Motor is noisy or seems to have a lower than normal torque, perform the Drive System Phase Continuity Testthen the Drive System Phase Loss Test.- If the washer vibrates excessively during high-speed spin, check the Vibration Absorber in the door.- Replace o r reattach the Vibration Absorber springs if they are broken or ou t of their mounting.- Check the washer ~nstal lation,nclu d~n g ow well the washer is leveled.- Check for weak or improperly supported flooring und er the washer.Troubleshooting: Washer Overfills- Se t th e Timer Knob into a wash increment and star! the washer. Unplug the washer and check if water stifl flows intothe washer. If it does continue to fill, check the water pressure at the washer.

    - Replace the Water Valve if the water pressure is above 15 psi.- If the water pressure is below 15 psi, it will need to be raised for the washer to operate properly.- Check the Air Dome Hose for proper routing, connections, and restrictions. Replace or reroute if needed. The Ai rDome Hose can b s hlown out to unplug some restrictions.- Check for proper wiring at the Pressure Switch (blue wire no.-32,gray wire no. 33, and purple wire no. 34). MachineControl, and Water Valve (orange wire no. 7 and blue wire no. 9).- Check the Pressure Switch to confirm that continuity is lost across terminals 1'1 (bEuewire no. 32) and 12 (purpIe wireno. 34)when the water level exceeds the wash level trip pomt and also lost across terminals 21 (gray wire no. 33) and22 (purple wire no. 34 ) when the water level exceeds the rinse level trip point.- Replace the Pressure Switch if continuity is not lost in either conditian.

    Troubleshooting: Wash Cycle Takes Longer than Expected- If the clothing load is out of balance, the washer may ad d time to redistribute the load and re-attempt high speedspins. This is normal behavior.- If an oversuds condition develops during the cycle, the washer wrFl add time to the cycle to clear out the suds. This isnormal behavior.- If the water pressure a t the washer is low, the washer will automatically add time to t h e cycle to account for longerthan expected fill times. This is normal behavior.Troubleshooting:Washer Will Not Spin- Set the Timer Knob Into a Spin increment and start the washer. Check to make sure the Door Locked Light comeson, after a 30-60 second delay.- If the Door Locked L q h l does no t come on, check for 120vac across the Poor Lock Wax Motor.

    - I f 120 vac is present when the washer is running in a Spin incremen t bu t the Door Lock Wax Motor does not extendfully, replace the Door Lock Switch Assembly.- If the Door Cock Wax Motor does extend, check for continuity across the Door Lock, Spin Enable Switch when theswitch actuator button is pressed in. Ef there is no con tinuity across the Door Lock. Sp ~n nable Switch, replace theDoor Lock Switch Assembly. If there is continuity across the Door Lock, Sprn Enable Switch, check the wiringbetween the switch and the Machine Control terminal P3-7. f there is continuity in this wire, replace the MachineControl.

    - If 720vac is not Dresent whe n the washer is running in a Spin increment, check the wiring between the MachineControl and DOO; Lock Wax Motor (brown wire n o. 14). If there is continuity between the Door Lock Wax Motor andMachine Control terminal P7-4, replace the Machine Control.

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    FUNCTION MACHINEC O W LCONNECTORIWIREPermanentPlessFabrlc %ledonDeflmtesFabricS e F e o nHand WashablesFababric Selection-mFdyFsbrlc Selection

    VOLTAGEAPPROX.(when activated)I

    MACHINECONTROLCONNECTORS WIRE TIMER CONTACT

    P5 WH71)

    P5 (WH 11)

    End&-Cycle Slgnal P5 (W 41) 1 P214(PU21) 24VDCONONlOFF 0 VDCOFF Not tnvotvdExba Rlnse

    Not l n v o k dPush toStartSwttch(when P d ) Not lnvorved

    (when not trlpped), Door Lock,Spin

    P3 /Z (PK31) I

    Enabled (when locked)

    Not Invoked

    'Not Invoked

    24M C

    P5 (WH11)

    Not Imrdved

    24 VDC5 (WH 11)Not Involved31 6 (OR 38)

    P 3 I B ( B R 39)

    P317W36 )

    MachlnsConlml andMotor Control Power

    24VDC

    PS (WH11)P5 (WH 11)P5 WH 11)

    P5 (WF111) Not lnvohgd

    Not Invohed

    24VDCLINE RELAY COM(BK 27)

    Cold Water Valve P5 (VVH I f ) m12(BU9)D m odtWax MotorBleachWax Motor

    I I

    P31 2 (PK 37)pa / 6 (OR 38)P3 8 BF! 39)

    NotInvolved

    12 0 VACHo t WaterValve

    0 VDC0VDC0 VDC

    P5 (WH t7)120VAC or500-7000 Ohms

    120 VAC

    120VACI

    P7,i (OR71

    Not I n v o M

    Not Involved

    2T

    120VAC or5MF7000 Ohms

    28

    4T

    Sobner WaxMotor P5 (WH 1% ) Not Involved 120VAC

    wm P5 (WH 31) 1 W l S ( R D 3 )1 Deray Llght P5 (WH $7 ) Not Involved 120 vec

    120 VAC Not Inwhmd

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    Drive System DiagnosticsTroubleshooting: DriveSystem Diagnostic Test- Set the Timer Knob nto the Delay increments.- Press the Push to Start Switch to start the washer in Delay mode. Confirm that the Delay Light comes on.- Check for 120 vac between the L and N terminals (black wire no. 27 and white wire no. 13) n the Motor Control.- Check th e wiring between the Machine Control and Motor Control.

    - Unplug the washer power cord.- Remave the 6-position Connector JP4 from the Motor Control.- PIug the washer power cord into the wall socket.- Press the Push to Start Switch and confirm that the Deray Light comes on . The washer should tumble continuously a t50 rpm in this test condition.

    - If the washer turnbfes, he drive system is functioning properly.- If the washer does not tumble, check fo r continuity through the fuse on the Motor Control.- If the fuse is functioning, check the six power transistors on the Motor Control for visible damage. Replace theMotor Control if any damage is evident.- If there is no visible damage on the Motor Control, perform the Drive System Phase LossTest.- Unplug th e washer power card and replace Motor Control Connector JP4 when finished.Troubleshooting: Drive System Phase Loss TestThe Motor can run under light loads when one of the three Motor phase s is not functioning, but it will be noisier(growling sound) and will have less torque than normal.- Unplug the washer power cord before removing or reconnecting an y wires on the Motor Control.- To access the Motor Control terminals, remove the two screws that hold the Motor Control Bracket to the Base,unsnap the two Twist Lock Wire Tjes that restrain the Wire Harness, siide the Motor ControE Assembly out and lay it infront of the washer. Remove the Drip Shield Cover.- Unplug the 6-position JP4 connector from the Motor Control.- Place the Timer Knob into the Delay increments.- When ready to test a phase, plug the washer power cord into the wall socket and press the Push to Start button.- Check Phase C by disconnecting the yellow or orange wire at the Motor Control. If the Motor operateswith a slightgrowling sound, phases A and B are operating correctly. Reconnect Phase C and test with phase B disconnected. IfIhe 7Y;aiofdoes nat rdn prop6r;. ?hasf:A ur3-k c'r i ~ 7 s : k x i ~ + - ! k ~ F L q s f ~ ~ d - ---- Check Phase B by disconnecting the white or red wire at the Motor Control. I f the Motor operates with a slightgrowling sound, phasesA and C are operating correctly. Reconnect Phase 0 and test with phase C disconnected. Ifthe Motor does not run properly,PhaseA or C is not functioning. Replace the Motor Control.- Check PhaseA by disconnecting the black or blue wire at the Motor Control. If the Motor operates with a slightgrowling sound, phases 8 and C are operating correctly. Reconnect PhaseAand test with phase8 disconnected. If

    the Motor does not run properly,Phase8 r C is not functioning. Replace the Motor Control.- If the Motor passes this test, p e r f o m the Drive System Phase Continuity Test.Troubleshooting: Drive System Phase Continuity TestThe Drive System Phase Loss Test must be performed prior to this test.- Unplug the washer power cord.- Replace the Motor if any of the following conditions are not met.- Remove the 6 phase wires from the Motor Control. Check for continuity in PhaseA between the yellow and orangewires. Check for continuity in Phase B between the red and white wires. Check for continuity in Phase C betweenthe black and blue wires. Each wire pair should show 2-3 ohms resistance.

    - Check to be sure there is no continuity between any of the wires and the Motor frame.- The terminals in the 6-position connector on the F.Totor should be the same height. Remove the connector andreplace the Motor If an y of the terminals are Pressed into the Motor.- Replace t h e 6-position connector on the MoZor, reassemble the Drip Shield Cover onto the Motor Control, andReassemble the Motor Control into the washer when finished. Make sure the two screws and Twist Lock Wire 7jesare fastened properly.

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    --3 IMER MOTOR MAKEBREAK - SEE NOTE BELOW

    THE TIMER MOTOR. WHEN CONTROLLED BY THE MICROPROCESSOR. MUSTALWAYS COMPLETE THE ADVANCE WHEN HAND-SETOR TIMER-DRIVEN INTO THE ADVANCE PORTIONOF THE 30 SECOND INTERVAL. ALLOTHER CONTACTS MUST ALSO MAKE AND BREAK DURING THE 5.8 SECOND ADVANCE.IF EXTRARINSE IS SELECTED. THE M~CROPROCESSOR ONTROL WILLADVANCE THE TIMER THROUGH THE OFFI XTRARINSE INCREMENT IFUCTW\RINSE IS NOT SELECTED.THE TIMER WILLSTOP ATTHE OFF I XTRA RINSE INCREMENT.INTERNAL BUSSING: 2C - 4C - 6C - 8C - 10C - 12C- 14C, 6B - 8T. AND 88 - 10BCONTACT 6-TOP MUST BREAK BEFORE CONTACT 14-BOTTOM MAKES IN INCREMENTS 13ANC 38.

    n V ) r-

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    R LOCKED -

    INEUNI

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