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
Models: and knowledge at a level generally considered acceptable in the appliance repair trade.
DMR57***/XAA Any attempt to repair a major appliance may result in personal injury and property
DMR77***/XAA damage. The manufacturer or seller cannot be responsible, nor assume any liability for
DMR78***/XAA injury or damage of any kind arising from the use of this data sheet.
Publication # tsDMR57 Revision Date 03/03/2011
SUPPORT INFORMATION
Training — Plus One Which Detergent Ingredients Give Best D/W Performance
http://my.plus1solutions.net/ Detergent with a separate rinse additive in the dispenser gives better dry-
ing performance. For tough baked on soils an Enzyme detergent is better
clientPortals/samsung/ at hydration of the food soils.
Help — GSPN http:// For staining such as tomato, coffee and tea, a detergent with Chlorine
service.samsungportal.com/ bleach will work on the stains much better than an Enzyme based deter-
Samsung Product Support TV gent.
http://support-us.samsung.com/ 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
spstv/howto.jsp more critical. The reduction of phosphates may cause spots and film on
Customer information videos and chat dishes that can form when the minerals and food bits combine during the
programs. Programs for Fridges, wash.
Laundry, Ranges & D/W 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,

Dishwasher Cycle Chart — Condensation Dry System

Pre-wash Pre-wash Pre-wash Main Total
Program Drain Rinse 1 Rinse 2 Rinse 3 Dry
1 2 3 wash Time
Normal 0:45 16:30 (16:30) - 32:30:00 7:30 (7:30) 32:30:00 20 110~134
Heavy 0:45 17:30 17:30 17:30 46:30:00 7:30 7:30 46:30:00 20 181
Delicate 0:45 16:30 - - 37:30:00 7:30 - 32:30:00 20 115
Rinse 0:45 - - - - 9:30 - - - 11
Quick 0:45 5:30 - - 11:30 7:30 - 12:30 - 38
5:30 11:30 12:30
Smart Auto 0:45 (17:30) (17:30) 7:30 (7:30) 20 58~181
~17:30 ~46:30 ~46:30
Rinse 3
Main
Program Pre-wash 1,2,3 Rinse 1,2 No
wash Sanitize
Sanitize
120˚F 140˚F 162˚F
Normal - - - - - -
(49˚C) (60˚C) (72˚C)
149˚F 158˚F 162˚F
Heavy - - - - - -
(65˚C) (70˚C) (72˚C)
113˚F 140˚F 162˚F
Delicate - - - - - -
(45˚C) (60˚C) (72˚C)
Rinse - - - - - - - - -
113 ˚F 140˚F 162˚F
Quick - - - - - -
(45˚C) (60˚C) (72˚C)
113~149˚ 140~158˚
162˚F
Smart Auto - - - - F - - F
(72˚C)
(45~65˚C) (60~70˚C)

# tsDMR57 RevD 03/03/2011 1

Wiring Diagram after 5-1-2009
DMR57 / 77 / 78

# tsDMR57 RevD 03/03/2011 2

Wiring Diagram before 5-1-2009 DMR57

# tsDMR57 RevD 03/03/2011 3

Wiring Diagram before 5-1-2009 DMR77 / 78

# tsDMR57 RevD 03/03/2011 4

CN302
1-Power Relay Driver
CN01 CN1 PBA Power
1 120vac
PCB after 5-1-2009
2-Heater Relay Driver CN802 LED 5vdc Driver
3 120vac
3-Half Load Sensor
DMR77-78 only CN501 Disp LED Driver
4-Trubidity Sensor
5-Trubidity Transmitter
7-6 5vdc
CN502 Disp LED Driver
8-Rinse Aid Sensor
DMR77-78 only
9-6 12vdc

CN301 CN801 Key Driver

1-Low Water Sensor 11-12 5vdc
3-Overflow Sensor
5-Water Counter
6-Leakage Sensor CN803 Key Driver
8-Thermistor DMR77-78 only
9– 12vdc 10-11 5vdc
10-Door Check Receiver

CN201 CN504 Display LED Driver

1-Distribution Mtr DMR77-78 only
DMR77-78 only
2-Half Load Mtr
DMR77-78 only
4-Vent Mtr CN701 MICOM Writer CN503 Display LED Driver
5-Circulation Mtr 3-1 5vdc
7-Inlet Valve
8-Drain Pump

CN7
1-Power Relay Driver
2-Heater Relay Driver CN1 PBA Power
PCB before 5-1-2009
3-Half Load Sensor 1 120vac
DMR77 only 3 120vac CN2 LED Driver
4-Trubidity Sensor
5-Trubidity Transmitter
7-6 5vdc CN4 Disp LED Driver
8-Rinse Aid Sensor DMR77 only
9-6 12vdc

CN8 CN6 Disp LED Driver

1-Low Water Sensor
3-Overflow Sensor CN9 Key Driver DMR77
5-Water Counter 12-11 5vdc
6-Leakage Sensor
8-Thermistor CN10 Key Driver
9-Door Check Driver 11-10 5vdc
10-Door Check Receiver

CN14 CN11 Disp DriverDMR77

1-Circulation Mtr
2-Fan Mtr CN12 MICOM Writer
4-Distribution Mtr 2-5 5vdc
DMR77 only
5-Dispensor
7-Inlet Valve CN13 Display LED Driver
8-Drain Pump

# tsDMR57 RevD 03/03/2011 5

 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

# tsDMR57 RevD 03/03/2011 6

 Drying Concerns
Condensing Dry System is used to
conserve energy

1. Verify proper operation of Rinse Aid

Dispensing.
Leaking and Poor 2. Verify Fan operation.
Washability—Check 3. Must use a Rinse Agent
for split wash arms 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.

Dishwasher Parts Change 5/2009 Components

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 16.5Ω
Temp. Resistance
Thermistor
(ºF) (kΩ)
41 125.78
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

# tsDMR57 RevD 03/03/2011 7

 DMR Models Samsung 'Dishwasher' Diagnostic Code Quick Guide
Error Error Cause Reason Tests Without Pulling
Type Mode D/W DMR models
Water 4E 1. When the pulse of 100 or less is detected Water supply valve defect, Flow Meter Check valve resistance
Supply 1 minute after the water supply starts defect, Particles within water supply and voltage at brown wire
Error 2. When flow meter pulse is 5 or less 5 valve, Water supply valve terminal not at CN14 to yellow wire at
seconds after the water supply starts connected, Main PBA defect detergent dispenser 1.2 K
3. No water detected 5 min after start ohms @ 120vac
℃
Water 4E1 When 80 or above is detected during Thermistor Defect, Water supply Perform service test t3,
Supply . water supply temperature of 80 or above, Main PBA for 3 minutes and compare
Error . . defect display temp with actual
Temp . . . water temp Celsius. It
Sensor tE1 When 0.2V or below, or 4.5V or above is Thermistor terminal not connected should be within about 8
Error maintained for over 3 seconds Thermistor Defect, Main PBA defect degrees C. Difference due
to tank vs. sump
temperature.
Drain 5E When OFF status of Low Level S/W is not Drain pump defect, Low Level Sensor Perform service test t5
Error detected within3 minutes during the drain defect, Particles clogging mater drain Check motor resistance
hose, Drain valve terminal not connected and voltage at white on
Main PBA defect CN1 to orange wires at
CN14 42.2 ohms @
120vac
Over- oE When overflow detection AD data is 4.0V or Foreign particles in water supply valve,
flow below for 3 seconds (When leakage sensor Case Sensor part leakage, Flow Meter
Error detects 4.0V or below for 1 seconds defect, Main PBA defect
during water supply)
Leak- LE When leakage sensor detects 4.5V or below Base part hose connection defect
age for 1 seconds Sump and Tub assembly defect
Error Drain Pump assembly defect
Main PBA defect
HE When the temperature change is 4 or less Heater defect Perform service test t3,
. . within the first 10 minutes Heater Relay defect will heat water
. . . after the heating starts. Heater terminal not connected approximately 1 degree C
. . . ℃ Main Wire-Harness defect per minute
HE1 When the temperature of the Thermistor is Main PBA defect If not working relay driver
Heater 80 or above for more than 3 seconds . voltage is on main pcb red
Error Heater Relay defect wire CN7 to white wire on
Thermistor defect door switch on right
Main PBA defect looking at back of panel.
Will read approximately
50 ohms and 12vdc off and
0.5vdc on.
Low 9E When Low Level is detected to cause Error Low Level Sensor defect service test t6
Water even after the water supply resumes after Low Level Sensor not connected no water in tub = OFF,
Level Low Level is detected for the 1st time Main PBA defect water in tub = ON possible
Error float or micro switch issue
Button bE2 When the button is pressed continuously Sub PBA defect Check for moisture in
Error . for over 30 seconds Main PBA defect console
When micro s/w is not detected for over 30 Distributor motor defect Perform service test t8
Half seconds after the Distributor motor starts Micro sw terminal not connected Violet wire CN 14 to
Load PE Main PBA defect Yellow wire at detergent
Error dispenser 2.6 K ohms @
120vac

# tsDMR57 RevD 03/03/2011 8

Service In- Press the Delay Start + ―ALL‖ is displayed for the first three (3) seconds and then ―t1‖ You can
spection Normal + Power keys change the mode by pressing the Normal key. Each time the Normal key is
Mode at the same time pressed, the mode changes in the order of t1 → t2 → t3 → t4 → t5
→ t6 → t7 → t8.
Mode Related parts Symptoms Activate Mode Live Test Notes
t1 Inlet valve, Flow 4E error If you press the Delay Start key, water Water fill in approxi-
Meter, Low Level Sen- 9E error is drained for 45 seconds and then the mately 70 seconds
sor water supply starts. average water pres-
If the pulse count is more than 660, sure, fills to about 1"
change the mode. past heater shield
Make sure to change the mode when (very little water
the pulse count is more than 660 in t1 showing in unit)
mode.

t2 Circulation Motor Nozzle does 1. Press the Delay Start key to start or Place some cups on
not spray stop the pump. racks and run circu-
2. If a low water level is detected, water lation pump to verify
is supplied again and the operation water distribution in
continues. tub.

t3 Circulation HE error 1. Press the Delay Start key to start or After temp increases
Motor, Heater, Ther- stop heater and circulation pump. 2 degrees C, time is
mistor 2. If a low water level is sensed, water about 50 seconds
is supplied again and the operation for each degree C
continues. increase
3. The current temperature is shown on
the display.
4. It operates up to 70ºC.

t4 Fan Motor Fan Motor not Press the Delay Start key to start or Listen for fan run-
working stop the fan motor. ning
t5 Drain Pump, 5E error 1. Press the Delay Start key to start the pump out is approxi-
Low Level 2 parts. mately 30 seconds
Sensor 2. ―t5‖ starts blinking while water is be-
ing drained.
3. When draining is finished, ―t5‖ is dis-
played without blinking.

t6 Low Level Display error 1. MICRO SWITCH On t6 to OFF with no

Sensor when The sensing state is displayed water – t6 to ON with
turning Micro as ‗On‘ on the display. water
S/W 2. MICRO SWITCH Off
on/off The sensing state is displayed as
‗OFF‘ on the display.

t7 Thermistor No change in The current temperature is displayed. Actual temp C of wa-

water temp ter in sump

t8 Synchronous Motor, PE Error 1. If you press the Delay Start key, the ON 8 seconds, OFF
Micro S/W parts operate just once. 4 seconds
2. There is no stop function.
3. While the synchronous motor is op-
erating, 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.

# tsDMR57 RevD 03/03/2011 9