Nova LM-700 manual Dead Unit No Display Troubleshooting

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THEORY OF OPERATION

MECHANICAL INSTALLATION

ELECTRICAL INSTALLATION

6.0 TROUBLESHOOTING

Dead Unit (No Display) Troubleshooting

1.Verify Main Power (between 90 VAC and 249 VAC, 50/60 Hz) is present on Main Power Cable (or Terminals) and Power Switch (located behind cover in upper left corner) is On.

Yes? Go to step 2.

No? Restore Main Power source.

2.With a volt meter capable of reading AC voltages between 90VAC and 249 VAC, and DC voltages around 20 VDC to 30 VDC, perform the following measurements on the Power Supply PCB:

Power Supply Input

Power Supply Output

(Brown and Blue wires)

(Black and Red wires)

PROGRAMMING

USER MODE

OPERATION

TROUBLESHOOTING

SPARE PARTS

LISTING

MAINTENANCE & SPECIFICATIONS

INDEX

AC Volts

90-240 VAC,

Yes: Measure Output

No: Go to 2a

2.a Recheck Main Power source, if Main Power present, replace Logic PCB.

Problem

Possible cause

Solution

 

 

 

No voltage to main power

Tripped breakers or blown

Reset breakers or replace

terminals

fuses at power source

fuse at power source

 

Main power wires

Check connections at plug

 

 

or washer power terminals

 

 

 

Voltage at main power

Power supply failure

Replace power supply

terminals, but LED display

 

 

is not lit (see additional

Damaged logic circuit

Replace logic circuit board

troubleshooting info above)

board

 

 

 

 

Pumps run slowly or not at

Pumps not plugged in

Verify pump electrical

all

properly

connectors are plugged in

 

 

properly

 

Pump failure

 

 

 

Replace failed pump

 

 

 

Password will not access

Password has been changed

Call Nova Controls

program mode

 

Customer Service for new

 

 

Logic PCB

 

 

 

Pump runs but will not

Squeeze tube failure

Replace squeeze tube

deliver product

 

 

 

Product tubing plugged

Replace product tubing

 

Pump roller failure

Replace pump roller

 

 

 

Poor results

Squeeze tube failure

Replace squeeze tube

 

Product tubing plugged

Replace product tubing

 

Pump roller failure

Replace pump roller

 

 

 

Dispenser not dispensing

Incorrect Operating Mode

Select appropriate

upon request from washer

(Op) selected from

Operating Mode under (Op)

 

programming menu

in the programming menu

 

Signal wires are loose or

Check signal wiring to

 

wired incorrectly

washer

 

 

 

+ DC Volts -

26-28 VDC?

Yes: Replace Logic PCB

No: Replace Power Supply

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P/N 20-07121-00 Rev. C

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Contents Mercury TL Laundry Occurrence Mode Automatic ModePush Button Mode Relay ModeMechanical Installation Trigger Signal Wiring Electrical InstallationMain Power Auto Formula Select WiringUser Mode Operation User Mode Display Introduction ProgrammingKey Descriptions Password Edit Pin Delay Time D1AAssign Pump A1A Only in Occurrence Mode Prime Pump P-1Key Icons Exit Program Mode EndProgram Mode Screens Set Numerical DisplayTroubleshooting Dead Unit No Display TroubleshootingSpare Parts Listing NO. Part NO. DescriptionMaintenance & Specifications Index