Fast Track Troubleshooting IMPORTANT SAFETY NOTICE – “For Technicians Only” This service data sheet is intended for use by persons having electrical, electronic, and mechanical experience and knowledge at a level generally considered acceptable in the appliance repair trade. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible, nor assume any liability for injury or damage of any kind arising from the use of this data sheet. Models: DMR57LFB/XAA DMR57LFS/XAA DMR57LFW/XAA DMR77LHB/XAA DMR77LHS/XAA DMR77LHW/XAA DMR78AHB/XAA DMR78AHS/XAA DMR78AHW/XAA Publication # tsDMR57 Revision Date 06/24/2011 Which Detergent Ingredients Give Best Dishwasher Performance SUPPORT INFORMATION Training — Plus One http://my.plus1solutions.net/ clientPortals/samsung/ Help — GSPN http:// service.samsungportal.com/ Detergent with a separate rinse additive in the dispenser gives better drying performance. For tough baked on soils an Enzyme detergent is better at hydration of the food soils. For staining such as tomato, coffee and tea, a detergent with Chlorine bleach will work on the stains much better than an Enzyme based detergent. Now that phosphate content in dishwasher detergent has plummeted to 0.5 percent from as high as 8.7 percent, conditioned (soft) water is even more critical. The reduction of phosphates may cause spots and film on dishes that can form when the minerals and food bits combine during the wash. It is important to test water hardness for washability complaints.. Dead Dishwasher — Possible Bad Fuse . Units with a fuse, if it blows there is very low A/C voltage at PCB L1 to N, L1 to Ground will read 120vac. Replace fuse and unit may work properly, usually a "weak fuse“. Neutral is fused, use caution as L1 is hot, you will be “shocked” between L1 and Chassis. Later production the fuse is "hidden" in the wire harness. Newer production (May 2009 Serial *S5*) has no fuse. Dead unit, look for cause, if none, replace main PCB (new part #) Dishwasher Cycle Chart — Condensation Dry System Pre-wash Pre-wash Pre-wash 1 2 3 Program Drain Normal 0:45 16:30 (16:30) - Heavy 0:45 17:30 17:30 17:30 Delicate 0:45 16:30 - - Rinse 0:45 - - Quick 0:45 5:30 Smart Auto 0:45 5:30 ~17:30 Program Main wash Dry Total Time 32:30:00 20 110~134 46:30:00 20 181 32:30:00 20 115 - - - 11 7:30 - 12:30 - 38 7:30 (7:30) 12:30 ~46:30 20 58~181 Rinse 1 Rinse 2 32:30:00 7:30 (7:30) 46:30:00 7:30 7:30 37:30:00 7:30 - - - 9:30 - - 11:30 (17:30) (17:30) 11:30 ~46:30 Rinse 3 Main wash Pre-wash 1,2,3 Normal - - - - Heavy - - - - Delicate - - - - Rinse - - - - Quick - - - - Smart Auto - - - - 120˚F (49˚C) 149˚F (65˚C) 113˚F (45˚C) 113 ˚F (45˚C) 113~149˚ F (45~65˚C) Rinse 3 Rinse 1,2 - - - - - - - - - - - - No Sanitize 140˚F (60˚C) 158˚F (70˚C) Sanitize 162˚F (72˚C) 162˚F (72˚C) 140˚F (60˚C) 162˚F (72˚C) 140˚F (60˚C) 140~158˚ F (60~70˚C) 162˚F (72˚C) 162˚F (72˚C) Wiring Diagram after 5-1-2009 DMR57 / 77 / 78 Wiring Diagram before 5-1-2009 DMR57 Wiring Diagram before 5-1-2009 DMR77 / 78 CN302 1-Power Relay Driver 2-Heater Relay Driver 3-Half Load Sensor DMR77-78 only 4-Trubidity Sensor 5-Trubidity Transmitter 7-6 5vdc 8-Rinse Aid Sensor 9-6 12vdc CN01 CN1 PBA Power 1 120vac 3 120vac PCB after 5-1-2009 CN802 LED 5vdc Driver CN501 Disp LED Driver CN502 Disp LED Driver DMR77-78 only CN301 1-Low Water Sensor 3-Overflow Sensor 5-Water Counter 6-Leakage Sensor 8-Thermistor 9– 12vdc 10-Door Check Receiver CN801 Key Driver 11-12 5vdc CN201 1-Distribution Mtr DMR77-78 only 2-Half Load Mtr DMR77-78 only 4-Vent Mtr 5-Circulation Mtr 7-Inlet Valve 8-Drain Pump CN504 Display LED Driver DMR77-78 only CN803 Key Driver DMR77-78 only 10-11 5vdc CN701 MICOM Writer 3-1 5vdc CN7 1-Power Relay Driver 2-Heater Relay Driver 3-Half Load Sensor DMR77 only 4-Trubidity Sensor 5-Trubidity Transmitter 7-6 5vdc 8-Rinse Aid Sensor 9-6 12vdc CN1 PBA Power 1 120vac 3 120vac CN503 Display LED Driver PCB before 5-1-2009 CN2 LED Driver CN4 Disp LED Driver DMR77 only CN8 1-Low Water Sensor 3-Overflow Sensor 5-Water Counter 6-Leakage Sensor 8-Thermistor 9-Door Check Driver 10-Door Check Receiver CN6 Disp LED Driver CN14 1-Circulation Mtr 2-Fan Mtr 4-Distribution Mtr DMR77 only 5-Dispensor 7-Inlet Valve 8-Drain Pump CN11 Disp DriverDMR77 CN9 Key Driver DMR77 12-11 5vdc CN10 Key Driver 11-10 5vdc CN12 MICOM Writer 2-5 5vdc CN13 Display LED Driver Leaking “LE” Code Moisture creates resistance between the pins. ALWAYS clean the area below the pins after troubleshooting. Check Pump Ass’y for proper twist lock. Condensation may form on the tray from uninsulated outside walls or large hole in the floor to a cold basement. Check Drain Hose for cut or small hole. Check all components mounted to the sump for any leakage. Cavitation “surging” In Prewash During the first fill (pre-wash), the water level supplied to circulation pump drops, while water is distributed through the spray arms and tower assembly (resulting in cavitation.) During the next fill, voids in these areas are already filled with water and level is sufficient (no cavitation.) Between uses, water in the spray arms and tower assembly completely bleed out, leaving them empty. At the beginning of next use, the D/W will pump for 45 seconds before filling and cavitation will occur during the prewash. Inform the customer that the cavitation “SOUND” is part of normal operation. If Cavitation Occurs During All Cycles or is Intermittent Make sure drain hose has not been moved from the side of cavity during Installation, verify proper “loop”. Check for proper fill (valve and flow meter) in t1 test mode. Water lost in distribution, such as inside cups, glasses, bowls that flip over can cause a drop in water supplying the wash motor and can cause cavitation sound during any cycle. Detergent Door Not Opening 1. Never overfill the dispenser compartment with powder or liquid, only go below or up to fill line. 2. If there is residue around the dispenser door area. Previously undispensed, partially dispensed, or door stuck close issue) clean it with mild soap & water. The residue can foul the mating latch. 3. If the customer uses “tablets” or some self contained type of soap tab, make sure it is fully seated and the door does not ‘sandwich’ it shut. 4. Make sure that in the rack nearest to the dispenser door when the door is shut, is not obstructing the opening of the dispenser with some protruding utensil. Testing The Detergent Door and Dispenser 1. Disconnect wires from disp. & close detergent door. 2. Connect Fused cheater cord and apply 120vac 3. In approximately 40 seconds the wax motor will open the door. 4. Remove power, allow wax motor to return. 5. Restore power to wax motor, in approximately 40 seconds the rinse aid will be activated. Remove power. 6. Close detergent door to repeat test Drying Concerns Condensing Dry System is used to conserve energy Leaking and Poor Washability—Check for split wash arms 1. Verify proper operation of Rinse Aid Dispensing. 2. Verify Fan operation. 3. Must use a Rinse Agent 4. Should use Sanitize Cycle 5. Should open door between 30 minutes and 3 hours after completion of the cycle. All in One products do not dry as well. Plastic items will not dry properly. Components Dishwasher Parts Change 5/2009 Component Voltage Ω Water Valve 120vac 1.2 KΩ Drain Pump 120vac 42.2Ω Heater 120vac 13Ω Half Load Mtr 120vac 2.6KΩ Fan Mtr 120vac 150Ω Disp Wax Mtr 120vac 2.3KΩ Circulation Mtr 120vac Temp. (ºF) 41 16.5Ω Resistance (kΩ) 125.78 50 98.323 59 77.454 68 61.465 77 49.12 86 39.517 95 31.996 104 26.065 113 21.385 122 17.599 Thermistor Service Press the Delay Start + “ALL” is displayed for the first three (3) seconds and then “t1” You can Inspection Normal + Power keys change the mode by pressing the Normal key. Each time the Normal key is pressed, the mode changes in the order of t1 → t2 → t3 → t4 → t5 Mode at the same time → t6 → t7 → t8. Mode t1 Related parts Inlet valve, Flow Meter, Low Level Sensor Symptoms 4E error 9E error Activate Mode Live Test Notes If you press the Delay Start key, water Water fill in is drained for 45 seconds and then the approximately 70 water supply starts. seconds average If the pulse count is more than 660, water pressure, fills change the mode. to about 1" past heater shield (very Make sure to change the mode when the pulse count is more than 660 in t1 little water showing mode. in unit) t2 Circulation Motor Nozzle does not spray 1. Press the Delay Start key to start or Place some cups on stop the pump. racks and run 2. If a low water level is detected, water circulation pump to is supplied again and the operation verify water distribution in tub. continues. t3 Circulation Motor, Heater, Thermistor HE error 1. Press the Delay Start key to start or After temp increases stop heater and circulation pump. 2 degrees C, time is about 50 seconds 2. If a low water level is sensed, water for each degree C is supplied again and the operation continues. increase 3. The current temperature is shown on the display. 4. It operates up to 70ºC. t4 Fan Motor t5 Drain Pump, Low Level Sensor t6 Low Level Sensor Display error when turning Micro S/W on/off t7 Thermistor No change in Press the Delay Start key to display the water temp current temperature. t8 Synchronous Motor, Micro S/W Fan Motor not Press the Delay Start key to start or working stop the fan motor. 1. Press the Delay Start key to start the 5E error 2 parts. 2. “t5” starts blinking while water is being drained. 3. When draining is finished, “t5” is displayed without blinking. PE Error 1. MICRO SWITCH On The sensing state is displayed as ‘On’ on the display. 2. MICRO SWITCH Off The sensing state is displayed as ‘OFF’ on the display. Listen for fan running pump out is approximately 30 seconds t6 to OFF with no water – t6 to ON with water Actual temp C of water in sump 1. If you press the Delay Start key, the ON 8 seconds, OFF parts operate just once. 4 seconds 2. There is no stop function. 3. While the synchronous motor is operating, its sensing state is displayed as On/OFF on the 88 segment display. 4. When the synchronous motor stops, the sensing state (On/OFF) of the micro switch is displayed.