Samsung AW127JB User manual

ROOM AIR CONDITIONER
AW126JB/127JB
AW126JE/127JE
AW12A6JD/12A7JD
AIR CONDITIONER CONTENTS
1. Precautions
2. Product Specifications
3. Installation and Operating
Instructions
4. Disassembly and Reassembly
5. Troubleshooting
6. Exploded Views and Parts List
7. Block Diagram
8. PCB Diagram
9. Wiring Diagram
10. Schematic Diagrams
SERVICE Manual
FANCOOL
POWER / MODE
°C
Hour
AW126JB/front 6/27/98 10:37 AM Page 2

1. Precautions
Samsung Electronics 1-1
1. Warning: Prior to repair, disconnect the
power cord from the circuit breaker.
2. Use proper parts: Use only exact
replacement parts. (Also, we recommend
replacing parts rather than repairing them.)
3. Use the proper tools: Use the proper tools
and test equipment, and know how to use
equipment may cause problems later-
intermittent contact, for example.
4. Power Cord: Prior to repair, check the
power cord and replace it if necessary.
5. Avoid using an extension cord, and avoid
tapping into a power cord. This practice
may result in malfunction or fire.
6. After completing repairs and reassembly,
check the insulation resistance, Procedure:
Prior to applying power, measure the
resistance between the power cord and the
ground terminal. The resistance must be
greater than 30 megohms.
7. Make sure that the grounds are adequate.
8. Make sure that the installation conditions
are satisfactory. Relocate the unit if
necessary.
9. Keep children away from the unit while it is
being repaired.
10. Be sure to clean the unit and its surrounding
area.
Fig. 1-1 Avoid Dangerous Contact
Fig. 1-2 No Tapping and No Extension Cords
Fig. 1-3 No Kids Nearby!
Fig. 1-4 Clean the Unit
AW126JB-1 6/27/98 10:38 AM Page 1

2. Product Specifications
2-1 Table
Samsung Electronics 2-1
Item
Type
Dimensions:
(Width X Height X Depth)
Packing Size
(Width X Height X Depth)
Voltage:
Phase
Frequency
Operating Current
Power Consumption
Refrigerant Type
Refrigerant Charge
Cooling Capacity
EER
Net Weight
Condenser
Condenser Fan
Evaporator
Evaporator Fan
Fan Motor
Compressor(Rotary)
Overload Protect
Compressor Capacitor
Fan Motor Capacitor
Fan Speed Control
Thermo Control
Sleep Timer
-
mm
mm
Volt
-
Hz
A
W
FREON
g
BTU/h
BTU/h.W
kg
Row
Type
Row
Type
W
Model
-
µF/ VAC
µF/ VAC
-
-
hr
Unit of Measure
Window
600 X 394 X 595
715 X 470 X 655
220~240
Single
50
5.8
1,330
R-22
660
12,000
9.0
220
Single
60
6.3
1,330
200~220
Single
50
6.8
1,330
R-22
650
12,000
9.045
45
R-22
880
12,000
9.0
R-22
660
12,000
9.0
2 X 14
Blower
2 X 14
Propeller Fan
3 X 14
Propeller Fan
2 X 14
Propeller Fan
Fan speed switch(High & Low)
Thermistor
24
30/450
3.5/450
AMAFS100ATEA
48A124JV1E1
MRA12030-12008
AMAFS100ZTEA
44B124IW1E6
MRA12008-12008
AMAFS100ATEB
48A124MV1E5
MRA98706-12008
Remarks
DUAL TYPE
AW126/127JE AW126/127JB AW12A6JD/12A7JD AW126JB(Mexico)
AW126JB-1 6/27/98 10:38 AM Page 3

2-2 Dimensions
2-2-1 Main Unit
2-2-2 Remote Control
2-2 Samsung Electronics
600
394 394
595
FANCOOL
POWER/ MODE
°C
Hour
MODE
Front view Side view
Unit : mm
Mode selection Buttons
(FAN, COOL)
Temperature adjustment buttons
Timer setting buttons
ON/OFF Buttons
Air flow swing button
Fan speed adjustment Buttons
(HIGH, LOW)
AW126JB-1 6/27/98 10:38 AM Page 4

3. Installation and Operating Instructions
3-1 Installation
Samsung Electronics 3-1
1. Make sure that you install the unit in an area that
provides good ventilation.
The air conditioner must not be blocked by any
obstacle affecting the air flow near the air inlet and
air outlet.
2. Make sure that you install the unit in an area which
can endure the weight and vibration of the unit.
3. Make sure that you install the unit away from heat
or vapor.
4. Make sure that you install the unit in an area where
the cooled air can be evenly spread in a room.
5. Make sure that you install the unit in an area away
from TVs, audio units, cordless phones, fluorescent
lighting fixtures and other electrical appliances.
(obtain a clearance of at least one meter)
6. Make sure that you install the unit in an area which
provides easy drainage for condensed water.
7. Make sure that you install the unit in an area not
exposed to rain or direct sunlight.
(Install a separate sunblind if exposed to direct sun-
light.)
8. Do not install the unit in an area subjected to noise
or vibration amplification which may affect your
neighbor.
(Fix the unit firmly if mounted in a high place.)
*When selecting the area for installing the unit, be sure to obtain approval of the customer.
Caution:
Do not use the air conditioner in such areas as a greasy area(including machine oil),
saline area(sea side), or sulphuric area(hot spring). When using the air conditioner in these areas,
special maintenance is required. Contact your local dealer or our service center for advice.
AW126JB-1 6/27/98 10:38 AM Page 5

3-2 Function Description
3-2-1 Cooling operation mode
3-2 Samsung Electronics
FANCOOL
POWER / MODE
°C
Hour
Remote control sensor Temperature/Timer settings
Temperature indicator
Timer indicator
POWER/MODE BUTTON
Operating mode indicator
The compressor is turned on and off according to the ambient temperature and set temperature.
1. Compressor on and off control
• Compressor on and off control according to the ambient temperature.
*The compressor is turned off when "ambient temperature = set temperature -1˚C"
*The compressor is turned on when "ambient temperature = set temperature +1˚C"
2. Default value after power reset ➔set temperature = 18˚C
FAN SPEED = HIGH
3. Set temperature indicating (setting) range : 1˚C interval from 18˚C to 30˚C.
3-2-2 Fan operation mode
1. If "Fan operation mode" signal is received from remocon.
➔ the compressor is immediately turned off and only fan motor is operated at set blowing speed.
➔ it changes such as "HIGH ➔LOW ➔ HIGH"( if Fan speed is selected).
2. The initial FAN speed is set to "HIGH".
3. The set temperature can not be indicated and set.
AW126JB-1 6/27/98 10:38 AM Page 6

3-2-3 LED lamp and LED display indication in case of error detection
Samsung Electronics 3-3
ERROR OPERATION
ROOM THERMISTOR
(OPEN OR SHORT)
7-SEG
LED DISPLAY
E1 displayed
LED LAMP DISPLAY
COOL FAN
Lamp blinking at every second (on for 0.5s and off for 0.5s)
LED lamp off
1. Set operation in case of error occurrence.
• Malfunction of each temperature sensor (open, short)
- Error mode display, warning sound.
- The operation status is off.
2. The "outdoor pipe thermistor" error mode carry out checking only during heating operation and
do not carry out checking during "COOLING" and "FAN" operation.
3-2-4 Panel key operation
Key operational function Key Type
Power/Mode 1. Operation mode change and POWER OFF(in case of model option cooling only) TACT
*at every ON
- Selected as "OFF –> COOL –> FAN –> OFF". (DEFAULT=OFF)
*Continuous operation is not available.
Key discription
Key name
AW126JB-1 6/27/98 10:38 AM Page 7

3-2-6 LED lamp operation specifications
LAMP name Operations specifications
COOL The mode is set to "COOL" –> ON
Others –> OFF
FAN The mode is set to "FAN" –> ON
Others –> OFF
˚C The set temperature is displayed or set -> ON
Others –> OFF
HR During setting of the convenient reserve (OFF TIMER) time -> blinking
After setting of the convenient reserve (OFF TIMER) time -> ON
Others –> OFF
In case of (set) temperature display
-> NO. (1) 7 seg. LED display indicates temperature of the tens digit (˚C, ˚F)
-> NO. (2) 7 seg. LED display indicates temperature of the units digit (˚C, ˚F)
In case of time (OFF TIMER) display
-> NO. (1) 7 seg. LED display indicates time of the tens digit
-> NO. (2) 7 seg. LED display indicates time of the units digit
3-4 Samsung Electronics
(1) (2)
AW126JB-1 6/27/98 10:38 AM Page 8

3-5
Samsung Electronics
3-2-7 Resistor values table of “ROOM THERMISTOR” for each temperature
Temperature
[˚C] THERMISTOR RESISTOR
[Kohm]
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
2.229
2.296
2.365
2.437
2.512
2.589
2.669
2.752
2.838
2.928
3.021
3.116
3.216
3.319
3.426
3.537
3.652
3.772
3.897
4.026
4.161
4.300
4.444
4.594
4.749
4.912
5.080
5.256
5.439
5.630
5.828
6.033
6.246
6.468
6.699
6.941
7.192
7.455
7.729
8.015
8.313
Temperature
[˚C] THERMISTOR RESISTOR
[Kohm]
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
8.622
8.944
9.281
9.632
10.000
10.380
10.780
11.200
11.630
12.090
12.560
13.060
13.570
14.120
14.680
15.280
15.900
16.550
17.240
17.960
18.700
19.480
20.290
21.150
22.050
22.990
23.900
25.030
26.130
27.280
28.470
29.720
31.040
32.430
33.890
35.430
37.050
38.760
40.560
<Room thermistor>
AW126JB-1 6/27/98 10:38 AM Page 9

4. Disassembly and Reassembly
4-1 Compressor Replacement Flow Chart
Samsung Electronics 4-1
Locate cause of defect
Release refrigerant
Disconnect electrical wiring
from compressor
Cut refrigerant lines
from compressor
Plug disconnected lines
Replace compressor
Inspect electrical
wiring for defects,
and terminals for
correct and secure
connections
Solder discharge line
Corrective action Check refrigerant oil level
Add oil as necessary
Solder suction line Use nitrogen gas
Perform soldering function
Fill system with nitrogen gas
Check for leakage
Recharge system
Recharge system
Evacuate system
Release nitrogen gas?
Problem?
Low oil level? NY
Y N
N
Y
Leakage?
AW126JB-1 6/27/98 10:38 AM Page 11

4-2 Checking the oil
4-2-1 Oil quality
4-2-2 Replacing and refilling the refrigerant oil
1. Replacing the compressor - Do not fill the system with oil as the compressor is already charged.
2. Replacing the condenser - Refill 50cc.
3. Replacing the evaporator - Refill 50cc.
4. Replacing the refrigerant - Refill 30cc.
5. The high pressure side is filled up with oil after the vacuum is completed.
6. When the refrigerant leaks, it is generally not necessary to refill the oil if the leakage is not severe.
4-2 Samsung Electronics
Fill the transparent container with 10cc of oil, and then conduct the test.
Refrigerant Cycle
Normal
Over-heated
Compressor damage
Color
Light Yellow
Brown
Dark brown
Odor
No Odor
-
Pungent oil
Remarks
Return with the system
Oil Change
Oil Change
Oil Condition
AW126JB-1 6/27/98 10:38 AM Page 12

4-3 Disassembly and Reassembly Procedure
Samsung Electronics 4-3
Stop operating the air conditioner, and pull out the power cord before repair.
No. Part name Procedures Remarks
①
➁
➂
Ass'y Grill
Ass'y Cabinet
Ass'y Control
1. Pull the panel front and remove the screw
on the grille
2. Hold the lower part of the grill with two
hands while pressing down on both sides of
the lower part of the cabinet, pull it forward
by about 30, and then lift it up for removal.
1. Remove the screws on both sides of the
cabinet to disconnect the cabinet and frame.
2. Pull the handle on the front side of the
bottom, and remove the unit from the
cabinet.
1. Remove 6 screws,
and earth wire screw.
2. Remove three lead wire assemblies.
3. Remove the blade V and arm blade.
4. Take out the control box forward.
FANCOOL
POWER/ MODE
°C
Hour
FAN
COOL
POWER/MODE
°C
Hour
FAN
COOL
POWER/ MODE
°C
Hour
FAN
COOL
POWER/MODE
°C
Hour
AW126JB-2 6/27/98 10:40 AM Page 1

Disassembly and Reassembly
4-4 Samsung Electronics
No. Part name Procedures Remarks
➃
➄
Frame Up
Case Cond &
Propeller Fan
1. Remove 10 screws on the Frame Up.
1. Remove two screws on the bottom side,
and 5 screws on the case cond.
2. Remove the nut flange, and remove the
propellr fan
AW126JB-2 6/27/98 10:40 AM Page 2

Samsung Electronics 4-5
Disassembly and Reassembly
No. Part name Procedures Remarks
➅
➆
Blower & Motor
Cond Casing
1. Remove two screws on the clip motor,
and remove the clip motor.
2. Move the motor & blower toward the
evap, and lift up the motor & blower
from the frame low.
1. Remove the cond casing
AW126JB-2 6/27/98 10:40 AM Page 3

5. Troubleshooting
5-1 Basic Checkpoints for Troubleshooting
Samsung Electronics 5-1
Check the basic checkpoints first to determine whether it is machine trouble or a problem in the
operation method. When it is not related to the basic checkpoints, perform checking in accordance
with the procedures of troubleshooting by symptom.
1) Is the voltage of the power source appropriate ?
(1)It should be within the range of AC 198V ~ 264V.
(2)The air conditioner may not operate properly when the voltage is out of this range.
2) Is the connection with the fan motor, compressor wire, and starting condenser
appropriately made ?
3) The symptoms listed in the table below are not indicative of machine trouble.
Symptom Cause and check
No operation • Check whether there is power failure or the power plug is pulled out.
• Check whether the unit is stopped as a result of completion
of the sleep time.
• Pull out the power plug for ten seconds, and then insert it again.
Air flows, but • Check whether the Air filter is clogged with dust or is dirty.
no cooling • Check whether the desired temperature is too high. Set the desired
temperature to a lower level than the current temperature.
• Check whether it is in "FAN" mode.
The remocon does • Check whether battery is completely depleted.
not operate • Check whether the battery is properly inserted.
• Check whether the receiving window of the remocon for the assembly
panel PCB is blinded.
• Check whether the remocon is affected by jamming due to a neon sign.
No temperature • Check whether the unit is in "FAN" mode.
setting (In "FAN" mode, only the current temperature is displayed, and the
desired temperature is not set.)
•Checking and Display of Fault Area
*Lamp --- blinking at every second (on for 0.5s and off for 0.5s)
--- LED Lamp off
ERROR OPERATION
ROOM THERMISTOR
(OPEN OR SHORT)
7-SEG
LED DISPLAY
E1 displayed
LED LAMP DISPLAY
COOL FAN
AW126JB-2 6/27/98 10:40 AM Page 5

5-2 Troubleshooting by Symptom
5-2-1 No power
5-2 Samsung Electronics
1) Check points
(1) Is the voltage of the power source normal ? (AC 198V ~ AC 264V)
(2) Is the electric wire in good contact ?(CN 71, RY 71)
(3) Is the output voltage of the IC01(KA 7812) normal ?(DC 11.5V ~ DC 12.5V)
(4) Is the output voltage of the IC02(KA 7805) normal ?(DC 4.5V ~ DC 5.5V)
(5) Is the connection of the assembly main PCB, and assembly panel PCB in good contact?(CN11, CN12)
Turn off the power, and then turn it on again five
seconds later.
Replace the assembly main PCB.
Dose the buzzer sound, when the power on?
Check whether the "COOL" LED lamp is on, and the
operation starts when pressing the ON/OFF button of
the remocon.
Is the primary voltage of the trans normal?
(AC 198V ~ AC 264V)
Is the secondary voltage of the trans normal?
(AC 13V ~ AC 17V)
Is the F01(3.15A) fuse blown?
Is the rectifying diode(D101~D106) normal?
Are the IC01(KA7812) and IC02(KA7805) normal?
Is the voltage of DC 17V ~ DC 23V applied at both
ends of the C102 electrolytic condenser?
Is the voltage of DC 12V applied at both ends of
the C104 electrolytic condenser?
Is the voltage of DC 5V applied at both ends of
the C105 electrolytic condenser?
Normal operation.
Normal operation.
Replace the fuse.
Check the power cord and electric wire.
Check and replace the trans.
•ChecktheD101~D106forcoldsoldering.
•Replacethediode
• Check both ends of the C102 for short
and cold soldering.
• Check the +12V for a short.
• Check the +5V for a short.
• Check and replace the C102, C104,
and C105.
• Check the IC01, and IC02 for cold
soldering and a short.
• Replace the IC01, and IC02.
Y
N
N
N
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
AW126JB-2 6/27/98 10:40 AM Page 6

5-2-2 When the assembly panel PCB is not operated
Samsung Electronics 5-3
1) Check points
(1) Is the voltage of the power source normal ?(AC 198V ~ AC 264V)
(2) Is the electric wire in good contact ?(CN71, RY71)
(3) Is the connection of the assembly main PCB, and assembly panel PCB in good contact?
(CN11, CN12)
(4) Is the voltage of +12V normal ?(CN 12 No 1 pin and No 12 pin : +12V±0.5V)
(5) Is the voltage of +5V normal ?(CN12 No 2 pin and No 12 pin : +5V±0.5V)
Check the micom
(IC02) for a short,
and replace it.
Check the micom
(IC02) for a short,
and replace it.
Check the IC03
for a short, and
replace it.
Check the micom
(IC02) for a short,
and replace it.
Normal operation
Check the micom
(IC02) for a short,
and replace it.
Replace the assembly panel PCB
Replace the assembly
panel PCB.
Y
N
Normal operation
N N
N
N N
N
Y
Y Y
Y Y
Y
Y
Turn off the power, and then turn it on again
five seconds later.
When the LED lamp is
not operated. When the TACT switch is
not operated.
Is the voltage of the micom
(IC02) No.47~50 port a square
wave?
Is the voltage of the
micom (IC02) No.50port
a square wave?
Is the voltage of the micom
(IC02) No.56,58~63 port a
square wave?
Is the voltage of the
micom(IC02) No.44port a
square wave?
Is the voltage of the
IC03 No. 15~18 a
square wave?
Check the IC04
for a short, and
replace it.
N
Is the voltage of the
IC04 No. 10~16 a
square value?
AW126JB-2 6/27/98 10:40 AM Page 7

5-2-3 When the remocon is not operated
5-4 Samsung Electronics
1) Check points
(1) Is the voltage of the power source normal ? (AC 198 ~ AC 264V)
(2) Is the electric wire in good contact ? (CN71, RY71)
(3) Is the assembly main PCB in good contact with the assembly panel PCB?(CN11, CN12)
(4) Is the voltage of +12V and +5V of the assembly panel PCB normal?
(CN12 No 1 pin and No 12 pin : +12V, No 2 pin and No 12 pin : +5V)
(5) Is the battery vortage of the remocon above DC 2.7V?
Turn off the power, and then turn it on
again five seconds later.
Replace the assembly panel PCB.
Dose the Buzzer sound, when the power on?
Check whether the "COOL" LED lamp is on
and th operation starts when pressing the
on/off button of the remocon.
Is the battery voltage of the remocon above
DC 2.7V?
Is the collector voltage of the remocon QT1, QT2(C2412)
a square wave?
Does the X-TAL(RJ 455JB) oscillate normally?
Is the input voltage of the micom(IC02) No. 26
pin of the assembly main PCB a aquare wave?
Go to the clause "No power".
The remocon is normally operated.
Replace the battery.
• Check the X-TAL for cold soldering and a
short.
• Replace relevant components.
• Check the micom(ICT1) QT1, and QT2 for
cold soldering and a short.
• Replace relevant components.
• Check the R202 and C202 components.
• Check the micom(IC02).
N
Y
N
Y
Y
Y
Y
N
N
N
N
Y
AW126JB-2 6/27/98 10:40 AM Page 8

5-2-4 When the compressor is not operated
Samsung Electronics 5-5
1) Check points
(1) Is the voltage of the power source normal ? (AC 198V ~ AC 264V)
(2) Is the desired temperature lower than the indoor temperature in the “COOL” mode?
(Compressor stopped)
(3) Is the desired temperature higher than the indoor temperature in the “HEAT” mode?
(Compressor stopped)
(4) Is the starting condenser in good contact?
(5) Is the electric wire in good contact ? (CN71, RY71)
(6) Is the output voltage of the IC01(KA7812) and IC02(KA7805) normal ?
Turn off the power, and then turn it on again five
seconds later.
Replace the compressor.
Dose the Buzzer sound, when the power on?
Check whether the "COOL" LED lamp is on and the
operation starts when pressing the on/off button
of the remocon.
Is the IC03(MAIN PCB) output normal?
When the compressor is ON, IC03(MAIN PCB)
No. 14 pin –> Low.
Does the relay(RY71) operate normally?
When the compressor is ON, the RY71 should operat.
Is the compressor normal?
Go to the clause "No power".
• Go to the clause "when he remocon
does not operate".
• Check the IC03(MAIN PCB) for short and
cold soldering.
• Replace the IC03(MAIN PCB).
• Check the relay coil resistance.
(resistance : About 150Ω±20Ω)
• Replace the relay.
• Check the operation of the O.L.P,
and replace it if necessary.
• Check the compressor
resistance.(0Ω: short, ∞Ω : open)
N
Y
Y
Y
Y
Y
N
Normal operation.
N
Y
N
N
N
Check whether the compressor is activated in three
minutes after turning on the power with the "COOL" or
"HEAT" LED lamp being switched on when selecting the
cool mode of the remocon.
AW126JB-2 6/27/98 10:40 AM Page 9

5-2-5 When the air swing motor is not operated
1) Check points
(1) Is the voltage of the power source normal ?(AC198V ~ AC264V)
(2) Is the electric wire in good contact ?(CN71, RY71)
(3) Is the swing motor connector in good contact?(CN71)
(4) Is the terminal connected to the swing motor in good contact?
(5) Is the output voltage of the IC01(KA7812) and IC02(KA7805) normal?
Turn off the power, and then turn it on again five
seconds later.
Replace the air-swing motor.
Dose the buzzer sound, when the power on?
Does the air-swing motor operate when
pressing the air-swing button of the remote control?
Is the IC03(MAIN PCB) output normal?
When the air-swing motor is on, IC03(MAIN PCB)
No. 12 pin ➝Low
Does the relay(RY 75) operate normally?
When the air-swing motor is operated, the
RY74 should be operated.
Go to the clause "No power".
Normal operation.
• Check the IC03(MAIN PCB) for a short
and cold soldering.
• Replace the IC03(MAIN PCB).
• Check the relay coil resistance.
(Normal: About 400Ω)
• Replace the relay.
• Check the air-swing motor resistance.
(0Ω: short, ∞Ω : open)
N
Y
N
Y
Y
Is the air-swing motor normal?
Y
Y
N
Check whether the “COOL” LED lamp is on, and the
operation starts when pressing the ON/OFF button of the
remocon?
Go to the clause of “when the remocon
dose not operated”
Y
N
N
N
5-6 Samsung Electronics
AW126JB-2 6/27/98 10:40 AM Page 10