American Dryer Corp MDG75V Troubleshooting, Microprocessor Controller Computer Models

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SECTION VI

TROUBLESHOOTING

IMPORTANT: YOU MUST DISCONTINUE AND LOCKOUT THE ELECTRIC SUPPLY AND THE GAS SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED FROM THE DRYER TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OFANY EQUIPMENT PER OSHA(Occupational Safety and HealthAdministration) STANDARDS.

The information provided will help isolate the most probable component(s) associated with the difficulty described. The experienced technician realizes, however, that a loose connection or broken/shorted wire may be at fault where electrical components are concerned...and not necessarily the suspected component itself.

Electrical parts should always be checked for failure before being returned to the factory.

The information provided should not be misconstrued as a handbook for use by an untrained person making repairs.

IMPORTANT: When replacing blown fuses, the replacement must be of the exact rating as the fuse being replaced.

WARNING: ALL SERVICE AND TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED PROFESSIONALOR SERVICE AGENCY.

WARNING: WHILE MAKING REPAIRS, OBSERVEALLSAFETY PRECAUTIONS DISPLAYED ON THE DRYER OR SPECIFIED IN THIS MANUAL.

MICROPROCESSOR CONTROLLER (COMPUTER) MODELS

A.No light emitting diode (L.E.D.) display...

1.Service panel fuse blown or tripped breaker.

2.Blown control circuit L1 or L2 1/2-Amp (Slo-Blo) fuse.

3.Failed microprocessor controller (computer).

4.Failed step down transformer (for models 380 volts or higher only).

B.Drive motor is not operating (does not start)...

1.Failed drive motor contactor (relay).

2.Failed arc suppressor (A.S.) board (for reversing models only).

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Contents MDG75V Retain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Contents Section Procedure for Functional Check of Replacement Receiving and Handling Important InformationWhat to do if YOU Smell GAS Safety PrecautionsPage Specifications SpecificationsMDG75V Component Identification Page Location Requirements Installation ProceduresUNPACKING/SETTING UP Dryer Enclosure Requirements Fresh AIR Supply Requirements General Exhaust Ductwork Information Exhaust RequirementsPage Page Multiple common Dryer Venting Importantventingreminders Electrical Requirements Electrical InformationMust be Provided SINGLE-PHASE 1Ø Electrical Connections Leads Important a Circuit Servicing Each Dryer Must be Provided Page MDG75V GAS GAS Information Type of GAS Page Page Preparation for OPERATION/START-UP GAS Models only Preoperational TestsBasket Tumbler Coating Shutdown Instructions Preoperational InstructionsParts SERVICE/PARTS InformationService Suggested Cleaning Schedule Routine MaintenanceCleaning Lubrication AdjustmentsLint Drawer Removal Microprocessor Controller Computer Models TroubleshootingBlower motor is not operating does not start Microprocessor controller computer display reads dSFL GAS Models only Dryer operates but is taking too long to dry Dryer is making scraping noise at basket tumbler area Data Label Data Label InformationSerial Number Sectionviii Procedure for Functional Check Replacement ComponentsPage 113160 1 11/27/02-25