Samsung WF-F125AV User manual

9-1
9. BLOCK DIAGRAM

9-2
9. BLOCK DIAGRAM
Memo

SERVICE Manual
PRODUCT IMAGE THE FEATURE OF PRODUCT
WASHING MACHINE
DRUM TYPE
BASIC : WF-F125AV
MODEL NAME : WF7452S9R
WF7452S9C
WF7450S9C
MODEL CODE : WF7452S9R/YLP
WF7450S9C/YLP
WF7452S9R/YLW
WF7452S9C/YLW
WF7450S9C/YLW
Refer to the service manual in the itself (http://itself.sec.samsung.co.kr/) for the more information.
SILVER WASH AG+
CALM WASH
PREWASH
CHILD LOCK
EASY IRON
1.
2.
3.
4.
5.

Contents
1. PRECAUTIONS ································································································································1-1
1-1. SAFETY NOTES BEFORE INSTALLING ······································································································1-1
1-2. SAFETY NOTES FOR INSTALLING··············································································································1-3
1-3. SAFETY PRECAUTIONS ······························································································································1-5
2. THE FEATURE OF PRODUCT·········································································································2-1
2-1. SPECIFICATIONS··········································································································································2-1
2-2. OVERVIEW OF THE WASHING MACHINE··································································································2-2
2-3. THE COMPARATIVE SPECIFICATIONS OF PRODUCT··············································································2-3
3. PRODUCT SPECIFICATIONS··········································································································3-1
3-1. OVERVIEW OF THE CONTROL PANEL·······································································································3-1
3-2. PROGRAMME CHART··································································································································3-3
3-3. NEW FEATURES···········································································································································3-5
3-4. TECHNICAL POINT·······································································································································3-8
3-5. DESIGNATION OF MAIN COMPONENTS··································································································3-10
4. ALIGNMENT AND ADJUSTMENTS·································································································4-1
4-1. GENERAL ERROR FUNCTION·····················································································································4-1
4-2. TEST MODE ··················································································································································4-3
5. ASSEMBLY AND DISASSEMBLY····································································································5-1
5-1. TOOLS FOR DISASSEMBLYAND ASSEMBLY····························································································5-1
5-2. ASSEMBLY AND DISASSEMBLY··················································································································5-2
6. TROUBLE DIAGNOSIS····················································································································6-1
6-1. TROUBLE DIAGNOSIS ·································································································································6-1
6-2. PROBLEM CHECKING AND METHOD OF PCB ··························································································6-3
6-3. DETAILED DIAGNOSIS·································································································································6-8
7. EXPLODED VIEWS AND PARTS LIST····························································································7-1
7-1. EXPLODED VIEWS OF TOP (FRONT)·········································································································7-1
7-2. EXPLODED VIEWS OF TUB·························································································································7-4
7-3. EXPLODED VIEWS OF CASE ······················································································································7-6
8. PARTS LIST (SA) ·····························································································································8-1
9. BLOCK DIAGRAM····························································································································9-1

Contents
10. SCHEMATIC DIAGRAM···············································································································10-1
10-1. EMZ (NOT USE IN THIS MODEL)·············································································································10-1
10-2. ROLD WF7450S9C,WF7452S9R/C···········································································································10-2
11. WIRING DIAGRAM·······················································································································11-1
11-1. PCB ASSY’ LAYOUT·································································································································· 11-1
11-2. Connector & Relay Terminals Description (MAIN PCB)·············································································11-2
11-3. Connector & Relay Terminals Description (AG-KIT PBA)··········································································· 11-3
11-4. DETAILED DESCRIPTIONS OF CONTACT TERMINALS (SUB PCB) ···························································
12. PCB CIRCUIT DIAGRAM·············································································································12-1
12-1. PCB CIRCUIT DIAGRAM···························································································································12-1
12-2. PCB CIRCUIT DIAGRAM (AG-KIT)···········································································································12-2
13. CIRCUIT DESCRIPTIONS············································································································13-1
13-1. OVERALL SYSTEM DIAGRAM·················································································································13-1
13-2. AC INPUT & POWER CIRCUIT·················································································································13-2
13-3. DRIVING SYSTEM CIRCUIT·····················································································································13-3
13-4. MOTOR CIRCUIT ······································································································································13-4
13-5. SENSOR DETECTION CIRCUIT···············································································································13-5
13-6. MOTOR TACHO INPUT SYSTEM·············································································································13-6
13-7. SILVER NANO SYSTEM····························································································································13-7
14. REFERENCE INFORMATION······································································································14-1
14-1. MODEL NAME···········································································································································14-1
14-2. REFERENCE INFORMATION···················································································································14-2
14-3. FABRIC CARE CHART······························································································································14-3
14-4. ELECTRICAL WARNINGS·························································································································14-4
14-5. Q & A··························································································································································14-5

13-1
13. CIRCUIT DESCRIPTIONS
13-1.OVERALL SYSTEM DIAGRAM

13-2
13. CIRCUIT DESCRIPTIONS
13-2.AC INPUT & POWER CIRCUIT
Function
- Generates a required DC power of 12V or 5V in case of supplied or disconnected AC power.
Description
- When AC 220V is applied to CN3, D16 D19 transforms it to DC 300V.
- DC 300V is generated for the LVT1 secondary source by IC3 and PC1 turning on/off.
- The secondary 12V depends on the ZD1 value.
- The 8V for the LVT1 secondary source is transformed to DC 5V through IC4.

13-3
13. CIRCUIT DESCRIPTIONS
13-3.DRIVING SYSTEM CIRCUIT
Function
- Controls each driving system (VALVE, DOOR S/W, DRAIN-MOTOR) by turning RELAY or TRIAC on/off.
Description
- MICOM outputs a high signal of 5V from pin # 1 - 7
- Then, pin # 10 to 16 of IC6 and IC8 are electrically grounded (0V).
- When pin # 10 to 16 are grounded, this creates an electric potential difference from the 12V that turns on RELAY 5,6,7
and TRIAC2,3,4,5.
- The operating parts (VALVE, DRAIN-MOTOR, DOOR S/W) connected to CN9 turn on if they are supplied with power.

13-4
13. CIRCUIT DESCRIPTIONS
13-4.MOTOR CIRCUIT
Function
- Supplies power to the motor and turns it CW/CCW (Right / Reverse direction).
Description
- The operation of TRIAC1 is the same as that of the driving system.
- If the electric potential of R49 is grounded (0V), TRIAC1 turns on.
- CN1 detects if the door is locked or unlocked. If unlocked, it does not apply power to the motor even if TRIAC1 turns on.
- If the door is unlocked and TRIC turns on, the motor connected to CN4 is supplied with power and drives CW (right
direction).
- Under such conditions, turning RELAY3 on will drive the motor CCW (reverse) as the wiring is switched to CCW.
- Turning RELAY4 on will switch the winding of the motor to one for higher driving.

13-5
13. CIRCUIT DESCRIPTIONS
13-5.SENSOR DETECTION CIRCUIT
Function
- Detects signals from the sensor and controls the current system.
Description
- The water level sensor is connected to pin 4 of CN7.
- The frequency of the level sensor changes according to the water amount in the tub.
- Then, the frequency is input to MICOM pin 48 for detecting the water amount.
- The DHSEH sensor is connected to CN7 pin 5 and CN6 pins 3,4.
- The resistance of the temp. sensor changes according to the ambient temperature. The changed resistance is applied to
R50 and R51.
- The voltage applied to R50 and R51 is decided according the temp. MICOM stores the value.
- WhenvoltageisappliedtoMICOMpins22and23,MICOMcomparesittothepredenedonebeforedetectingthe
current temp.

13-6
13. CIRCUIT DESCRIPTIONS
13-6.MOTOR TACHO INPUT SYSTEM
Function
- Detects the current RPM of the motor and controls the output.
Description
- The motor TACHO sensor is connected to CN10 B-pin.
- According to the current RPM of the motor, a square wave is applied to pin 8.
- The square wave that is input to TR2 BASE turns the motor on if high (5V), and turns it off if low (0V). And this operation
will be inverted to TACHO NET for a clear wave with no noise.
- The signal is applied to MICOM pin 13. Then MICOM counts the frequency of the input signal and detects the current
RPM of the motor.

13-7
13. CIRCUIT DESCRIPTIONS
13-7.SILVER NANO SYSTEM
Function
- Applies the electric current to the silver plate during the water supply and uses the silver water to perform the bacteria-
free or sterilization processes.
Description
- Selects the silver nano feature to operate the system.
- Supplies water to the two silver plates AG_B and AG_A. Then, SINAL_A and SIGNAL_B output a high signal of 5V.
- Both SIGNAL_A and SIGNAL_B repeat this for 15 seconds outputting a high signal of 5V. SIGNAL_A output turns
TR1andTR6ontogenerateapotentialdifferencebetweenthe12Vandthegroundingforcausingthecurrenttoow.
SIGNAL_B output turns TR4 and TR5 on to generate a potential difference between the 12V and the grounding for
causingthecurrenttoow.
- TheowingcurrentistransformedtoavoltagebytheresistanceofR27.
- Then,thevoltageisappliedtoIC1pin2andusedfordetectingandcontrollingtheowingcurrent.

5-1
5. ASSEMBLY AND DISASSEMBLY
No. Tool DESCRIPTION
1 Box driver
10 mm
13 mm
19 mm
Heater (1)
Motor (1), Balance (5), 2 holes of each left and right of the
shock absorber 1 Pulley hole
2 Double-ended spanner 10, 13, 19 mm
Replaceable for the box driver.
Since the bolt runs idle when the box driver is used, use the
box driver 17mm.
3 Vice pliers Tool to protect the idle and abrasion of the bolt for the box
driver.
4 Other (Driver, Nipper, Long nose) General tools for the after service.
5 JIG for the Tub 1 (Disassemble and Assemble)
5. ASSEMBLY AND DISASSEMBLY
5-1. TOOLS FOR DISASSEMBLY AND ASSEMBLY

5-2
5-2. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
ASS’Y COVER
TOP
1. Remove the two screws holding the Top Cover at
the back of the unit.
2. Remove the top-cover through pushing and pulling.
3. Then, the Water (Pressure) Sensor, Noise Filter
and Water Valve can be replaced.
FRAME FRONT
1. Remove the Top Cover and the Ass’y Drawer.
2. Remove the two screws on the front of the control
panel.
Warning! To avoid risk of electrical shock, personal injury or death, disconnect the power to the ashing
machine
sensor pressure
noise lter water valve

5-3
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
FRAME FRONT
3. Bend the left side of the control panel to unhook by
at head screwdriver.
(Take care not to scratch the surface of the frame-
front)
4. Draw the control panel out of the frame-front by
gripping the left side of the control panel, pushing
the bottom of the control panel up
5. Cut the cable-tie
Remove the control panel by disconnecting the
connector that connects PCB to the wire-harness.
6. Remove the cover lter with a at head crewdriver.
7. Remove the Wire Diaphragm from the Frame Front
and unseat the Diaphragm.
8. Remove the 8 screws on the frame front.

5-4
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
BELT Before removing the belt, should be opened the Cover
Bottom.
1. Remove the belt before the re-assembly.
2. Ensure the belt is placed on the center of the motor
pulley.
<Belt Assembly>
Hang the belt on the motor pulley()
before placing it around the pulley ()
MOTOR
1. Remove the wire housing from the motor.
2. Remove the bolts holding the motor by using the
power screwdriver.
3. Remove the motor.
Water Supply
Valve
1. Remove the xing screws for the water supply
valve.
2. Disconnect the valve wires.
3. Separate the water hoses.



5-5
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
Water Level
Sensor
1. Remove the top cover.
2. Remove the xing screws for the water level
sensor.
3. Disconnect the water level sensor harness.
4. Disconnect the hose pressure.
5. Replace the water level sensor.
Door-Hinge
1. Remove the xing screws holding the Door-Glass.
2. Separate the glass.
3. Remove the screws holding the bracket holder
4. After removing the two screws holding the Holder
Glass, replace the Door Hinge.
5. After putting them back together, check if the
screws holding the Door Hinge is fastened
properly.

5-6
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
Drain Pump
1. Insert the at head screwdriver into the slot on the
top of the Cover Filter and lever it down to separate
it.
2. Unscrew the drain lter by turning it counter
clockwise.
- The water remaining inside could ow out.
So, put an empty bowl on the oor to hold the
water.
Drain Pump
3. Tilt the unit backward and take out the drain pump.
4. Disconnect the incoming water hose and the wire
harness.
(Caution: Check if the unit is plugged out. There is
possibility of electric shock.)
5. Separate the Hose Filter Tub and the Drain Hose.
CHECK POINT
1. Remove the Drain Filter and check if there are foreign substances (coin, buttons, etc) blocking inside - If
so, clear the inside.
2. Check if the wire harness is connected properly - If not, connect it properly.
3. If water leaks, check if the Clamp Hose and the Cap Drain are assembled tightly
- If not, assemble them tightly.
Remove the water remaining inside by turning the Filter counter clockwise.

5-7
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
Door S/W
1. Open the Door.
2. Remove the Spring Diaphragm and separate the
Diaphragm from the Frame Front.
- Insert the at head screwdriver and pry up the
spring to remove the Spring Diaphragm.
- The Diaphragm could get damaged when taking it
out. So, unseat it in one direction slowly.
3. Remove the screws holding the Door S/W.
4. Take out the Door S/W.
5. Disconnect the wire connector. (Press the hook to
unlock the tab and plug it out.)
Heater
1. Remove the Frame-Front.
2. Disconnect the Connector Housing.
3. Remove the nut holding the Heater and separate
the Heater.

5-8
5. ASSEMBLY AND DISASSEMBLY
Part Name Descriptive Picture How To Do
Heater
4. Take out the Heater from the Tub.
(Caution: Be sure to insert the Heater into
the Bracket in the Tub. If not, it may cause
a re. And, make sure to have the Packing
seating on its place. Fasten the nut with
5Kgf/km². If the nut is fastened loosely, it
may cause water leakage.)