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.