Samsung DMR57LFB/XAA User manual

Dead Dishwasher — Possible Bad Fuse
Fast Track Troubleshooting
Models:
DMR57LFB/XAA
DMR57LFS/XAA
DMR57LFW/XAA
DMR77LHB/XAA
DMR77LHS/XAA
DMR77LHW/XAA
DMR78AHB/XAA
DMR78AHS/XAA
DMR78AHW/XAA
Publication # tsDMR57 Creation Date 01/21/2010
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.
Program Drain Pre-wash
1
Pre-wash
2
Pre-wash
3
Main
wash Rinse 1 Rinse 2 Rinse 3 Dry Total Time
Norma l 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
Smart Auto 0:45 5:30
~17:30 (17:30) (17:30) 11:30 ~46:30 7:30 (7:30) 12:30 ~46:30 20 58~181
No
Sanitize Sanitize
Norma l ----
120?F
(49?C) --
140?F
(60?C)
162?F
(72?C)
Heavy ----
149?F
(65?C) --
158?F
(70?C)
162?F
(72?C)
Delicate ----
113?F
(45?C) --
140?F
(60?C)
162?F
(72?C)
Rinse ---------
Quick ----
113 ?F
(45?C) --
140?F
(60?C)
162?F
(72?C)
Smart Auto ----
113~149?
F
(45~65?C)
--
140~158?
F
(60~70?C)
162?F
(72?C)
Pre-wash 1,2,3 Rinse 1,2Program Main
wash
Rinse 3
Dishwasher Cycle Chart — Condensation Dry System
Which Detergent Ingredients Give Best Dishwasher Performance
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 a higher phosphate content
and Chlorine bleach will work on the stains much better than an Enzyme based detergent.
• 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 #)
1

Wiring Diagram after 5-1-2009
DMR57 / 77 / 78
2

Wiring Diagram before 5-1-2009 DMR57
3

Wiring Diagram before 5-1-2009 DMR77 / 78
4

CN01 CN1 PBA Power
1 120vac
3 120vac
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
CN301
1-Low Water Sensor
3-Overflow Sensor
5-Water Counter
6-Leakage Sensor
8-Thermistor
9– 12vdc
10-Door Check Receiver
CN802 LED 5vdc Driver
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
CN503 Display LED Driver
CN504 Display LED Driver
DMR77-78 only
CN803 Key Driver
DMR77-78 only
10-11 5vdc
CN801 Key Driver
11-12 5vdc
CN502 Disp LED Driver
DMR77-78 only
CN501 Disp LED Driver
CN11 Disp DriverDMR77
CN13 Display LED Driver
CN1 PBA Power
1 120vac
3 120vac
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
CN8
1-Low Water Sensor
3-Overflow Sensor
5-Water Counter
6-Leakage Sensor
8-Thermistor
9-Door Check Driver
10-Door Check Receiver
CN14
1-Circulation Mtr
2-Fan Mtr
4-Distribution Mtr
DMR77 only
5-Dispensor
7-Inlet Valve
8-Drain Pump
CN4 Disp LED Driver
DMR77 only
CN2 LED Driver
CN12 MICOM Writer
2-5 5vdc
CN10 Key Driver
11-10 5vdc
CN6 Disp LED Driver
CN9 Key Driver DMR77
12-11 5vdc
CN701 MICOM Writer
3-1 5vdc
PCB after 5-1-2009
PCB before 5-1-2009
5