Thursday, December 31, 2015

Hyundai HQL260WR – Image Quest LCD TV– SMPS Circuit Diagram – NCP1203060R2 – SPA17N8C3(FET)

Image Quest AD-12014(I)ST 14V BA – HQL260WR – HQL320WR  - Used Samsung SMPS BN44-00019A
How to enter Service Mode (Factory Mode)
A choice of standard 4:3 and advanced 15:9 and 16:9 and Panorama aspect ratios
High luminance and contrast ratio, low reflection and wide viewing angle
PIP(Picture-In-Picture)
Noise Reduction
Favorite Channel
Variable Sound Setting
Variable Screen Setting
SRS-WOW (An Extraordinary Enhancement for Music and Entertainment)
SMPS CIRCUIT DIAGRAM and PWB
Service Methods
Colour Adjustment
When Color adjustment has to be adjusted during service If the module is replaced or changed Flash ROM(U33), It must be readjusted using PC, Include Color pattern Color Adjust method(power off state).
Colour adjustment Pattern
REMOCON:MUTE + 2 + 5 + 8 + POWER + OK
OSD B/D: VOLUME(DOWN)+ POWER(OSD B/D) + POWER(REMOCON) + OK
ENTERED INTO AGING MODE at TV Source.
REMOCON:MUTE + 1 + 4 + 7 + POWER ;REMOVE-POWER OFF(OSD B/D)
OSD B/D: MENU + CH POWER(REMOCON) ;RESET-POWER OFF(OSD B/D)
CHECKING MCU VERSION
REMOCON:ADVANCED + DISPLAY-NTSC MODEL
REMOCON: ADVANCED + INFORMATION-PAL MODEL
INITILIZATION
REMOCON: MUTE + 3 + 2 + 1 + POWER
OSD B/D :MENU + CH POWER(REMOCON)

Wednesday, December 30, 2015

Philips LCD TV SMPS Circuit Diagrams

5000 SERIES 32”, 4100 SERIES 24”, 5000 SERIES 40” and 5000SERIES 48” - Philips LCD TV SMPS Circuit Diagrams.
 All power supplies are a black box for Service. When defective, a new board must be ordered and the defective one must be returned, unless the main fuse of the board is broken; always replace a defective fuse with one with the correct specifications. This part is available in the regular market. Consult the Philips Service web portal for the order codes of the boards.
A 715G6550 PSU 

A 715G6863 PSU 
A 715G6934 – PSU 
Power Supply Unit (PSU)
Caution: it is mandatory to remount all different screws at their original position during re-assembly. Failure to do so may result in damaging the PSU.
1. Gently unplug all connectors from the PSU.
2. Remove all fixation screws from the PSU.
3. The PSU can be taken out of the set now.
Important delta’s with the TPM15.6L LA classis platform are
> New power architecture for LED backlight
> “Boost”-signal is now a PWM-signal + continuous variable.
The control signals are
> Stand-by (PS_ON)(only for 48 inch-715G6338)
> Lamp “on/off”
Backlight adjust (DIM) (not for PSDL)
The output voltages to the chassis are:
> 12V output (stand-by and on-mode for 32 and 40 inch)
> 8.5V output (stand-by for 48 inch)
> 12V output (on-mode for 48 inch)
> +12V_audio (audio AMP power) (on-mode)
> Output to the display; in case of
- IPB: High voltage to the LCD panel
- PSL and PSLS (LED-driver outputs)
- PSDL (high frequent) AC-current.
The diversity in power supply units is mainly determined by the diversity in displays. 
The following displays can be distinguished
> CCFL/EEFL backlight: power panel is conventional IPB
> LED backlight:
- side-view LED without scanning: PSL power panel
- side-view LED with scanning: PSLS power panel
- direct-view LED without 2D-dimming: PSL power panel
- direct-view LED with 2D-dimming: PSDL power panel.
[PSL stands for Power Supply with integrated LED-drivers.  PSLS stands for a Power Supply with integrated LED-drivers with added Scanning functionality (added microcontroller).  PSDL stands for a Power Supply for Direct-view LED backlight with 2D-dimming.]

Philips 30 inch and 32 inch LCD TV – Power supply Regulator board [SMPS] – Schematic

Main Supply (Block "D")
Diversity
Mains input voltage diversity (1308):
– EU: 198 - 264 V AC.
– US: 108 - 132 V AC (doublers).
– AP multi: 90 - 275 V
AC (auto doubler with AVS10 control IC and triac).
– China: 160 - 270 V AC.
Mains filter diversity:
– EU, China: 1 x mains filter + harmonic coil.
– US, AP: 2 x mains filter + inrush current resistor.
Screen size diversity:
– One module for 30" to 37" sets.
– Two (almost identical) modules on one PWB for 42" sets.
Specifications
• 12 V / 3 A on connector 1304 (for Ambient Light and to generate +8V6).
• 24 V / 5 A for LCD back-light on connector 1304 (for Sharp 12 V, 9 A).
• +18V, -18V sound on connector 1M02.
• +8V6 (derived from +12V from the Main Supply, switched "off" in Stand-by).
• Output voltage: over-voltage protection of resonant supply.
• Output current protection of resonant supply.
• Current protection at some safety fault conditions.
Stand-by mode
• The resonant supply is switched "off" via relay 1450 that is driven by the Stand-by Supply (via connector 1305).
Outputs
• 130-400 V
DC (full range) for Stand-by Supply (connector 1306).
• Mains over-voltage and safety protection for Stand-by Supply (connector 1307).
Inputs
• Relay drive voltage (for STAND-BY/ON mode) on connector 1305.
• DC_PROT signal to protect loudspeakers when there is a DC voltage across the loudspeakers (1M02).

Stand-by Supply (Block "E")
The Stand-by Supply is based upon the "Fly Back Converter" principle. 

NOBLEX – SANYO 42LC816F LCD TV – How to enter Service Mode – SMPS schematic

Used semiconductors in the SMPS: L6599DTRP – L6562ADTRP – STF13NK50Z(FET) – 2SK3264-F82(FET)
Service Mode (Factory Mode) - White Balance Adjustment
> Press and hold the MENU button on Side Controls.
> Keep pressing the MENU button and press the MUTE button on the remote control, and the FACTORY MENU will be displayed.
> Select “DATA” line by pressing UP or Dn button.
> Press ◄►button to adjust data.
>Press MENU button to exit service mode.[All adjusted data in service mode will be memorized into EEPROM automatically.]
White balance Adjustment
Picture Mode: STANDARD
Color Temperature: NORMAL
Aging Time: More than 10 minutes
> Enter the Service Mode.
> Select "Source ALL" by pressing ed button, and select "Properties White" by pressing 7 8 button.
> Set R,G,B value to “FF” by pressing NUMERIC buttons.
To adjust Red : Press 1 (data value up) and 4 (data value down).
To adjust Green : Press 2 (data value up) and 5 (data value down).
To adjust Blue : Press 3 (data value up) and 6 (data value down).
Decide one item in three items to a fixed value (For example, let R be fixed value), select item of other 2 colours
(Example, G or B), and adjust to produce a normal black and white picture in highlight areas.
(Note: At this time, Adjust the other 2 colours data less than fixed data.)
> Exit the Service Mode.
After adjustment, confirm white balance again by normal picture.
SMPS CIRCUIT DIAGRAM - PWB

Monday, December 28, 2015

LG32F1 LCD TV and AOCL32W451 LCD TV - Power Supply Schematic

EAY40484901 EAX41678701- LG 32F1LCD TV SMPS – CIRCUIT DIAGRAM 
Ics used: FA5501AN – MC80F0308 – NCP1271B – NCP1207 – SCQ0565 – TDA4863 – L6565

EAY40484901 EAX41678701 - SCHEMATIC
AOC L32W451 - SMPS SCHEMATIC

Saturday, December 26, 2015

How to enter service mode – Firmware update – LG 19LU7000 – LG22LU7000 TV-DVD combo

19LU7000 - 22LU7000 – LG TV-DVD Combo - Service mode – Firmware update – DVD mechanism open/close problem repair  North/Latin America - Europe/Africa - Asia/Oceania
SERVICE MODE (FACTORY MODE)
Press “Menu” “1” “2” “4” 7” and “5” keys on the remote.
DVD Door Open/Close problem
Symptom
1 Door being not Opened/Closed completely
2 Unbalance Open/Close the door
a. AC power off, while door is open.
b. Grab both L/R door with each hands and pull it open.
c. If pulled with hands disregard noises heard while opening by force.
d. Doors are opened till it’s symmetrical to the centre.
e. AC power on and press eject button with remote or with keys and check to make sure that Door is opened or closed.
f. If the Door is not aligned correctly or still not functioning correctly repeat the procedure from a.
USB S/W DOWNLOAD
To update the TV software, use only the “USB IN ” jack on the side of the TV. 
(The USB IN jack on the side of the TV works for the music or photo service.)
sub Micom & TV Software Download
a Put the “hmx_lu7000_GB.hdf(UK_Model)//hmx_lu7000_EU.hdf(EU_Model)” in the USB.
b Connect the USB device to the “USB IN” jack on the side of the TV
c AC Power Off and On the TV.
d Waiting until the new software upgrade is finished.
e Finishing the version uploading, you have to put USB stick and “AC Power” off.
f After putting “AC Power” on and check updated version on your TV.
If downloading version is more high than your TV have, TV can lost all channel data.
In this case, you have to channel recover.
If all channel data is cleared, you didn't have a DTV/ATV test on production line.
DVD S/W DOWNLOAD
To update the DVD software, use only the DVD Player.
a Open the Door, press “Eject” keys on a remote
b Insert the S/W update Disc
c Close the Door, press “Eject” keys on a remote
d Check the follow message
e Press “Play” keys on a remote
f Waiting until the new S/W upgrade is finished
g Automatically open the Door.
h Finishing the vesion uploading, you have to remove Disc and “AC Power”off
i After putting “AC Power on and check updated vesion by going to the Factory Mode
j Press “MENU” “1” “2” “4” “7” and “5” keys on the remote.
k Check the information for S/W version.

Friday, December 25, 2015

LG21FJ6 – Colour TV – Circuit Diagram – Main Components

 To protect the picture tube and FBT,the average beam current and peak beam current may not too high.  The beam current limit information and High Voltage (H.V) tracking information are derived from the H.V voltage winding of T401
1. The contrast and brightness reduction of RGB is proportional to the voltage on the pin 48 of IC501.
2. As the beam current (slow),and H.V (fast) are changes, the voltage of point A is changed.
3. By the increase of beam current, the point A voltage is decreased and this information is fed to pin 48 of IC501.
> Contrast reduction begins when V49 is below than 3.1V.
> By the more increasing of the beam current, the V48 decreased and eventually when this voltage is less than 1.8V the brightness reduction is started.

[Check the value of R416, the resistor connected to +B for (open); if the ABL action is not detected.  This is a common fault to this set.]
Deflection SECTION
1. The H drive output is open collector and active low, I.e. the H-out TR should conduct during the low period of output.
2. Under normal operation condition the duty cycle of the output pulse is 50%.
3. To ensure a smooth start/stop behavior of the horizontal deflection and protect the H-out TR, there are 3 different condition of H-drive output.
During switch-on. The horizontal output starts with the double frequency (31KHz) and with duty of 75 %(off),25%(on).  After about 50mSec of switch-on.  The frequency is changed to normal value (15.625KHz) and duty cycle to 50%. 
During switching-off. Also the frequency is switched to the double value and R.G.B drive is set to Max. and after 100mSec R.G.B is set to Min. and 50mSec later the H drive is switch-off.
4. The H drive pulse from the MICOM (IC 501) is amplified by the horizontal drive circuit, to get sufficient base drive current for the high voltage switching TR (Q402).
If the horizontal output transistor [2SC6093] found shorted (Collector to Emitter short); before replacing it with an other one, check the solder terminals of the C414; for any loose.  Check the capacitance of this capacitor.  Any failure (Capacitance value deteriation or Loose solder), to this capacitor will damage the horizontal output transistor.
You won't get any time to check any voltages.  The damage to horizontal output transistor will be instantaneous, as you power on the circuit.
SCHEMATIC

Thursday, December 24, 2015

Sony HCD-TZ100 DVD RECEIVER – SMPS and FL display schematic

Sony HCD-TZ100 – HCD-TZ200 – HC-DTZ300 DVD RECEIVER – SMPS and FL Display Circuit diagram - HCD-TZ100/TZ200/TZ300 is the amplifier, DVD/CD and tuner section in DAV-TZ100/TZ200/TZ300.
Used Semiconductors: STR F6138-LF1352 or STR LF6168-LF1352 – HT16515 FK Display Driver
Mechanism Type - CDM85-DVBU102
Optical Pick-up Name - KHM-313CAA
Stereo mode (rated) - 65 W + 65 W (at 3 ohms)
 SMPS SCHEMATIC
SMPS-PWB
FL Display Schematic
CLICK ON THE PICTURES TO MAGNIFY

Sunday, December 20, 2015

How to Disassemble Samsung VC 6025 Vacuum Cleaner - Exploded View - Parts List

Removal of Button-C/Reel and Button-Switch - Removal of Panel - Control
> Detach the BUTTON with a flat head screw driver.
> Loosen the three screws and detach PANEL-CONTROL.
Disassembly of Cover-Dust ASS’Y - Disassembly of Main Body-Control/Removal of Main PCB Assembly
> Loosen the one screw and detach the INDICATOR-ASS’Y.
> Loosen the four screws and grasp both sides of the BODY-CONTROL. Lift it upwards, > Separate the WIRE ASS’Y from the PCB-MAIN ASS’Y.
Motor Replacement and Cord-Reel Replacement
> Loosen the two screws and separate COVER-MOTOR from the body.
> Separate MOTOR and WIRE-HARNESS MOTOR.
> Disassemble the GUARD-CORD with a flat head driver. (Insert it into the gap and push the hook to the opposite side.)
> Separate the CORD-REEL from the main body
> Hold the COVER-REEL, and wind the power cord to the left 4~5 times.
> After winding, assemble the CORD-REEL to the body.
EXPLODED VIEW and PARTS LIST
CLICK ON THE PICTURES TO ZOOM IN

AX-1100(R)M - AX-1100(SL)M - Sharp MICROWAVE OVEN - FUNCTION OF IMPORTANT COMPONENTS

AX-1100(R)M - AX-1100(SL)M - Sharp MICROWAVE OVEN WITH STEAM AND GRILL - Circuit diagram and other components - FUNCTION OF IMPORTANT COMPONENTS [Contn:]
DOOR OPEN MECHANISM
1. The door lever is gripped and the door open handle is pulled.
2. The latch head L is lifted up by the door lever.
3. The latch head U is lifted up by the linked latch lever.
4. Now both latch heads are lifted up, so they can be released from the latch hook.
5. Now the door can be opened.
SWITCH
MONITORED INTERLOCK SWITCH SW1
1. When the oven door is closed, the contacts (COM-NO) of the switch must be closed. And the contacts (COM-NC) must be opened.
2. When the oven door is opened, the contacts (COM-NO) of the switch must be opened. And the contacts (COM-NC) must be closed.
MONITOR SWITCH SW2
The monitor switch is activated (the contacts opened) by the latch head U on the door while the door is closed. The switch is intended to render the oven inoperative by means of blowing the fuse F2 F8A when the contacts of the monitored interlock switch SW1 fail to open when the door is opened.
Function
1. When the door is opened, the contacts (COM-NC) of monitor switch SW2 close. At this time the contacts (COM-NO) of monitored interlock switch SW1 are open.
2. As the door closed, the monitor switch SW2 contacts (COM-NC) are opened.  The contacts (COM-NO) of monitored interlock switch SW1 and door sensing switch SW3 are closed (On opening the door, each of these switches operate inversely.).
3. If the door is opened and the monitored interlock switch SW1 contacts (COM-NO) fail to open, the fuse F2 (F8A) blows immediately after closing of the monitor switch (COM-NC) contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE F2 F8A, TEST THE MONITORED LATCH SWITCH SW1 AND MONITOR SWITCH SW2 FOR PROPER OPERATION
DOOR SENSING SWITCH SW3
1. When the oven door is closed, the contacts (COM-NO) of the switch must be closed.
2. When the oven door is opened, the contacts (COM-NO) of switch must be opened
INTAKE DAMPER SWITCH SW4
The intake damper switch is turned on and off by the air damper cam which is rotated by the intake damper motor.
ANTENNA SWITCH SW5
The antenna switch is turned on and off by the shaft assembly which is rotated by the antenna motor.
FUSE
FUSE F1 20A 250V
If the wire harness or electrical components are short-circuited, this fuse F1 blows to prevent an electric shock of fire hazard.
FUSE F2 F8A 250V
1. If the wire harness or electrical components are short-circuited, this fuse blows to prevent an electric shock or fire hazard.
2. The fuse also blows when the monitored interlock switch SW1 remains closed with the oven door open and when the monitor switch SW2 contact (COM-NC) closes.
3. The fuse also blows when the asymmetric rectifier, H.V. rectifier, H.V. wire harness, H.V. capacitor, magnetron or secondary winding of high voltage transformer is shorted.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is solid state device that prevents current flow in both directions. And it prevents the temperature rise of the high voltage transformer by blowing the fuse F2 F8A when the high voltage rectifier is shorted.
The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 kV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1.7 kV. D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage. (The process of the blowing the fuse F2 F8A.)
1. The high voltage rectifier is shorted by some fault when microwave cooking or dual cooking.
2. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high voltage winding of the high voltage transformer.
5. The large electric currents beyond 8A flow through the primary winding of the high voltage transformer.
6. The fuse F2 F8A blows by the large electric currents.
7. The power supplying to the high voltage transformer is cut off.
THERMAL CUT-OUT
THERMAL CUT-OUT TC1 145
°C (MG)
This thermal cut-out protects the magnetron against overheat. If the temperature goes up higher than 145
°C because the fan motor is interrupted or the ventilation openings are blocked, the thermal cut-out TC1 will open and the oven will switch off. The defective thermal cutout must be replaced with a new one.
THERMAL CUT-OUT TC2 170°C (OVEN)
This thermal cut-out protects the oven against overheating or fire inside the oven. If the temperature rises above 170
°C the thermal cutout opens the oven will switch off. The defective thermal cut-out must be replaced with a new one.
THERMAL CUT-OUT TC3 170
°C (ENGINE)
This thermal cut-out protects the engine unit against overheating. If the temperature rises above 170
°C the thermal cut-out opens the oven will switch off. The defective thermal cut-out must be replaced with a new one.
 NOISE FILTER
The noise filter assembly prevents radio frequency interference that might flow back in the power circuit.
HEATING ELEMENT
1. GRILL HEATING ELEMENT GH
The grill heating element is provided to brown the food and is located on the top of the oven cavity.
2. ENGINE UNIT (ENGINE HEATING ELEMENT) EH
The engine unit is provided to generate the steam
MOTOR
1. ANTENNA MOTOR AM
The antenna motor rotates the antenna located under the oven cavity.
2. FAN MOTOR FM
The fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from heating food. It is then exhausted through the exhausting air vents of the oven cavity.
3. INTAKE DAMPER MOTOR DM
The air damper position is set automatically by the intake damper motor, intake damper switch, air damper cam and damper shaft. These components are operated by a signal that judges the selected cooking mode by the control unit.
4. PUMP MOTOR (TUBE PUMP ASSEMBLY)
The tube pump assembly consists of the pump motor, roller and tubes. The pump motor rotates the roller. The roller presses the tube. The water in the tube is pressed out from the tube pump assembly.
THERMISTOR
1. THERMISTOR (ENGINE) TH1
The thermistor is a negative temperature coefficient type. The temperature in the engine unit is detected through the resistance of the thermistor, and then the control unit causes the relay to operate, thus the current to the engine heating element is turned ON/OFF.
2. THERMISTOR (GRILL) TH2
The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the relay to operate, thus the current to the grill heating element is turned ON/OFF.
Circuit diagram and other components

MICROWAVE OVEN AX-1100 - Sharp - How to detect Faults and Checks

MICROWAVE OVEN WITH STEAM AND GRILL - Sharp AX-1100(R)M - AX-1100(SL)M (Contn:)
MAGNETRON TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.
1. CARRY OUT 3D CHECKS.
2. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
3. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate
an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.
4. Reconnect all leads removed from components during testing.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions. 
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted).
The power output of this oven is rated using the method specified by IEC 60705. Full details of how to curry out this procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre (part number SERV-LITMW01).
The IEC60705 procedure must be carried out using laboratory-type procedures and equipment.
These requirements make the procedure unsuitable for routine performance checks.
NOTE: The following test method gives an indication of the output power only, it cannot be used to establish the actual/rated output power. If the true output power is required, then the IEC60705 test method must be used.
Alternative simplified method:
1. Place 2 liters of cold water (between 12
°C and 20°C) in a suitable container.
2. Stir the water and measure the temperature in
°C. Note temperature as T1.
3. Place the container in the microwave and heat the water for 1 minute and 40 seconds on full power.
4. When the 1 minute and 40 seconds is completed, remove the container and stir the water. Note the water temperature as T2.
5. Calculate the output power using the following formula: R.F. Power Output = (T2 - T1) x 90.
NOTE: The result from this test should be within the allowance of 2000cc alternative method. (
±15%).
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range.
Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and more than 100 k
W in the other direction.
CARRY OUT 4R CHECKS.
ASYMMETRIC RECTIFIER TEST
CARRY OUT 3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested using an ohmmeter set to its highest range across the terminals A+B of the asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both directions then the asymmetric rectifier is good. If the asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is faulty and must be replaced with high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the high voltage transformer is shorted.
CARRY OUT 4R CHECKS.
NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
MONITOR SWITCH TEST
CARRY OUT 3D CHECKS.
Before performing this test, make sure that the monitored interlock switch and the relay RY-4 on the control unit are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the right latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
CARRY OUT 4R CHECKS.
THERMISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the thermistor from the control unit. Measure the resistance of the thermistor with an ohmmeter.
THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the below.
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out (MG) TC1 indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure.
An open circuit thermal cut-out (OVEN) TC2 indicates that the oven cavity has overheated, this may be due to no load operation or fire in the oven cavity.
An open circuit thermal cut-out (Engine) TC3 indicates that the engine unit has overheated, this may be due to empty water tank or pump motor failure.
CARRY OUT 4R CHECKS.
BLOWN FUSE (F1) 20A
CARRY OUT 3D CHECKS.
If the fuse F1 20A is blown, there is a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse with the correct value replacement.
BLOWN FUSE (F2) F8A (NOISE FILTER)
CARRY OUT 3D CHECKS.
1. If the fuse F2 F8A is blown when the door is opened, check the monitored interlock switch and monitor switch.
2. If the fuse F2 F8A is blown by incorrect door switching replace the defective switch(es) and the fuse F2 F8A.
3. If the fuse F2 F8A is blown, there could be shorts in the asymmetric rectifier or there is a ground in wire harness. A short in the asymmetric rectifier may be occurred due to short or ground in H.V. rectifier, magnetron, high voltage transformer or H.V. wire. Check them and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
GRILL HEATING ELEMENTS (TOP) AND ENGINE HEATING ELEMENT TEST
CARRY OUT 3D CHECKS.
Before carrying out the following tests make sure the heating element is cool completely.
1. Resistance of heater.
Disconnect the wire leads to the heating element to be tested. Using ohmmeter with low resistance range. Check the resistance across the terminals of the heating element as described in the following table.
CONTROL UNIT TEST
The control unit consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and ohmmeter.
In this service manual, the control panel assembly is divided into two units, Control Unit and Key Unit, and troubleshooting by replacement is described according to the symptoms indicated.
1. Key Unit Note: Check Key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
1) When touching the pads, a certain pad produces no signal at all.
2) When touching a number pad, two figures or more are displayed.
3) When touching the pads, sometimes a pad produces no signal.
Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit perform the key unit test (Procedure N) to determine if control unit is faulty.
 In connection with pads
1) When touching the pads, a certain group of pads do not produce a signal.
2) When touching the pads, no pads produce a signal.
 In connection with indicators
1) At a certain digit, all or some segments do not light up.
2) At a certain digit, brightness is low.
3) Only one indicator does not light up.
4) The corresponding segments of all digits do not light up; or they continue to light up.
5) Wrong figure appears.
6) A certain group of indicators do not light up.
7) The figure of all digits flicker.
 Other possible troubles caused by defective control unit.
1) Buzzer does not sound or continues to sound.
2) Clock does not operate properly.
3) Cooking is not possible.
4) Proper temperature measurement is not obtained.
KEY UNIT (MEMBRANE SWITCH) TEST
If the display fails to clear when the STOP key is depressed, first verify the ribbon cable is making good contact, verify that the door sensing switch operates properly; that is the contacts are closed when the door is closed and open when
the door is open. If the door sensing switch is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch connector). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP key making momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is a faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
CARRY OUT 4R CHECKS.
To be continued

Sharp MICROWAVE OVEN AX-1100 - Test Mode - Error Codes

  Sharp AX-1100(R)M - AX-1100(SL)M - MICROWAVE OVEN WITH STEAM AND GRILL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage fuse, High voltage harness.
Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may, in some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed, carry out 3D checks and reconnect the leads to the primary of the power transformer.
TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge the high voltage capacitor.
[The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the highvoltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.]
TO CHECK 4R
1) Reconnect all leads removed from components during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power level to HIGH (100%). And set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold, carry out 3D checks and re-examine the connections to the component being tested.
Some normal boards are found in board units that have been returned due to oven failure. So, most of board replacements may arise from poor harness connection. Accordingly, before replacing any board that was judged to require its replacement, use the following procedure to re-check that the connection terminal of a connector has been properly inserted:
When the connectors have been incorrectly inserted to the control unit.
CN-A > The oven can not be powered on.  (Fan motor, oven lamp, damper motor and /or pump motor do not operate.)
CN-B > No heating can be done. Thermistor error EE01 or EE12 appears.
RY1 > Antenna motor, high voltage transformer, oven lamp, engine heating element, and grill heating element do not operate.
RY2 > Engine heating element does not operate.
RY3 > Grill heating element does not operate.
RY4 > Antenna motor and high voltage transformer do not operate.
2. When latch switch adjustment is incorrect
When latch switch adjustment is incorrect, symptoms such as no heating, no heating start, no activation even with start button pressed, etc. will occur.
3. Final error code is memorized in ROM (control unit). (Refer to Error list EE code on page 10-1.)
4. When the intake damper motor is locked or wire leads to it are not connected, cooking mode is stopped minute after starting cooking.
5. minutes after stopping cooking, energy save mode will work and no segment is displayed.
How to operate the test mode
Error List
Operate test mode
(Power on and door closed) 
® STOP ® STEAM HIGH ® MICRO ® Door open ® Select Test No. 2by [WEIGHT UP/ DOWN] ® START ® Select Address 04h (or 05h) ® 
START
EE code: EE code is memorized in the FLASH address 04h as error history. (Only antenna error code is memorized in the FLASH address 05h.)
NOTE: When an error mode occurs except for shortage of water error and the oven stopping state continues for more than 3 minutes, the oven will be powered off by Energy save mode function.
How to check in the event of an error
Check the plumbing of the tubes.
If the plumbing is normal, check the performance of the tube pump assembly.
CLICK ON THE TABLES TO ZOOM IN
To be continued