Friday, September 02, 2016

Sony STR-K870 – Audio Video receiver – How access to test mode – FLD test mode – Factory reset – AV Receiver repair and service

Category: Audio System Repair and Service 

Contents of this article 

  • Factory Reset procedure 
  • FLD Test mode 
  • Sound field Clear mode 

Sony STR-K870

FACTORY PRESET MODE
All preset contents are reset to the default setting.
Procedure:
While depressing the FM MODE and the DISPLAY buttons simultaneously, press the power button to turn on the main power. The message “FACTORY” appears and switch off the set.
While depressing the FM MODE and the DISPLAY buttons simultaneously, press the power POWER button again. The message “FACTORY” appears and the present contents are reset to the default values.
AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE
Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.
Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button or the PRESET TUNING + button, press the power button to turn on the main power. Either the message “9 k STEP” or “10 k
STEP” appears. Select the desired step.
FLUORESCENT INDICATOR TUBE TEST MODE
All fluorescent segments are tested. When this test is activated, all segments turn on at the same time, then each segment turns on one after another.
Procedure:
While depressing the TUNING – and the SPEAKERS (OFF/ A/B/A+B) buttons simultaneously, press the power button to turn on the main power.
1. All segments turn on.
2. Press the VIDEO 1 button, confirm display.
3. Press the VIDEO 1 button, confirm display
4. Press the VIDEO 1 button, All segments turn off.
5. Every pressing of the VIDEO 1 button turns on each segment one after another in the same order.
(Not only the VIDEO 1 button, but also the other buttons such as VIDEO 2 , VIDEO 3 , DVD , MD/TAPE , SA-CD/ CD , FM and AM can be used.)
SOUND FIELD CLEAR MODE
The preset sound field is cleared when this mode is activated.
Procedure:
While depressing the 2CH button, press the power button to turn on the main power.
The message “SF. CLR.” appears and initialization is performed.
SOFTWARE VERSION DISPLAY MODE
The software version is displayed.
Procedure:
While depressing the TUNING– and the DISPLAY buttons simultaneously, press the power button to turn on the main power. The model name, destination and the software version are displayed.
KEY CHECK MODE
Button check
Procedure:
While depressing the TUNING – and the MAIN MENU buttons simultaneously, press the power  button to turn on the main power. “REST 30” appears.
Every pressing of any button other than POWER  counts down the buttons. The buttons which are already counted once are not counted again. When all buttons are pressed “REST 00” appears.
When MASTER VOLUME is rotated in clockwise direction, “VOL MIN”, “VOL 1” to “VOL 69”, “VOL MAX” appear.
AUTO BETICAL MODE
Procedure:
1. Check that the antenna is connected.
2. Press the POWER  button to turn on the power while pressing the MEMORY button.
CHANGE COMMON MODE
This mode is command mode changed to AV 1 or AV2.
Procedure:
While depressing the ENTER button, press the power  button to turn on the main power.
Either the message “C.MODE.AV 1” or “C.MODE.AV 2” appears.
SHIPMENT MODE
All preset contents are reset to the default setting.
Procedure:
While depressing the SPEAKERS (OFF/A/B/A+B) and the
FM buttons simultaneously, press the power button to
turn on the main power. “CLEARED” appears.

Numark TT1600 Turntable – Disassembling procedure - How to replace the Tone Arm – Audio system repair and service

Category: Audio System Repair and Service 

Contents of this article 

  • How to remove the case
  • How to remove the wiring 
  • How to remove the tone arm

Numark TT1600

TONE ARM REPLACE MT PROCEDURE 
Flip over the turntable and remove the 9 screws on the outer edges.
Remove the back cover by pulling it apart.
Remove the clip located on the backside of the audio jack housing by gently pulling it out.
There will be some resistance but continue to pull gently.
The clip is located right underneath the audio jacks.
Remove the screw that connects the black wire of the tone arm to the base of the audio jack housing.
Gently pull the wire that you just unscrewed to release it from the clip.
Remove the two screws connecting the circuit board to the tone arm.
Remove the two remaining screws connecting the tone arm to the device.
Flip the turntable back over to the top side.
Remove the counter weight located at the back of the tone arm.
Push out the pin keeping the tone arm in place using a Phillips #00 screwdriver.
Once you have pushed the pin out with the screwdriver, pull the rest of it out using your hand.
Pick up the tone arm and point the back end of it towards its base.
Push the back end of the tone arm into the hole.
Flip the turntable over and pull the tone arm all the way through the hole.

Nissan Rogue - AV System diagnosis – Self diagnostic mode – Initialization – Wiring diagram – How to remove the audio system - Car audio Repair and service DIAGNOSIS SYSTEM

Category: Car Audio Repair and Service 

Contents of this article 

  • Self diagnosis function
  • Wring diagram 
  • Audio system removal

Nissan Rogue - AV System

On Board Diagnosis Function
METHOD OF STARTING
1. Turn the ignition ON.
2. Turn the audio system OFF.
3. While pressing the preset 1 button, turn the volume control dial clockwise or counterclockwise for 40 clicks or more. 
Shifting from current screen to previous screen is performed by pressing BACK button.
4. The trouble diagnosis initial screen is displayed, and Self Diagnosis or Confirmation/Adjustment can be selected.
SELF DIAGNOSIS MODE
Audio Unit Self Diagnosis
1. Select Self Diagnosis.
2. Self diagnosis screen is displayed. The bar graph visible in center of screen indicates progress of self diagnosis.
3. Diagnosis results are displayed after the self diagnosis is completed. The unit names and the connection lines are color coded according to the diagnostic results.
Diagnosis results
Unit
Connection line
Normal
Green
Green
Connection malfunction
Gray
Yellow
Unit malfunction 1
Red
Green
1: Control unit (audio unit) is displayed in red.
# Replace audio unit if Self Diagnosis did not run because control unit malfunction is indicated. The symptom is audio unit internal error.
# If multiple errors occur at the same time for a single unit, the screen switch colors are determined according to the following order of priority: red > gray.
4. Comments of self diagnosis results can be viewed in the diagnosis result screen.
Audio Unit Confirmation/Adjustment
1. Select Confirmation/Adjustment.
2. Select each switch on the Confirmation/Adjustment screen to display the relevant trouble diagnosis screen. Press the BACK switch to return to the initial Confirmation/Adjustment screen
Vehicle Signals
A comparison check can be made of each actual vehicle signal and the signals recognized by the system.
Speaker Test
Select Speaker Test to display the Speaker Diagnosis screen. Press Start to generate a test tone in a speaker. Press Start again to generate a test tone in the next speaker. Press End to stop the test tones
Error History
The self diagnosis results are judged depending on whether any error occurs from when Self Diagnosis is selected until the self diagnosis results are displayed.
However, the diagnosis results are judged normal if an error has occurred before the ignition switch is turned ON and then no error has occurred until the self diagnosis start. Check the Error Record to detect any error that may have occurred before the self diagnosis start because of this situation.
The frequency of occurrence is displayed in a count up manner. The actual count up method differs depending on the error item.
Count up method A
# The counter is set to 40 if an error occurs. 1 is subtracted from the counter if the condition is normal at a next ignition ON cycle.
# The counter lower limit is 1. The counter can be reset (no error record display) with the Delete log switch. Count up method B
# The counter increases by 1 if an error occurs when ignition switch is ON. The counter will not decrease even if the condition is normal at the next ignition ON cycle.
# The counter upper limit is 50. Any counts exceeding 50 are ignored. The counter can be reset (no error record display) with the Delete log switch.
Display type of occurrence
frequency
Error history display item
Count up method A
AV communication line, control unit (AV)
Count up method B
Other than the above
Error item
Some error items may be displayed simultaneously according to the cause. If some error items are displayed simultaneously, the detection of the cause can be performed by the combination of display items.
Error item
Description Possible cause
CONTROL UNIT (AV)
AV communication circuit initial diagnosis
malfunction is detected.
Replace the audio unit if the malfunction
occurs constantly.

AV COMM CIRCUIT
When one of the following is detected:
• malfunction is detected in combination
meter power supply and ground circuits.
• malfunction is detected in AV communication circuits between audio unit and
combination meter.
• Combination meter power supply or
ground circuits.
• AV communication circuits between audio unit and combination meter.
Camera System
This mode is used to adjust the guide line display position of the rear
view camera.
AV COMM Diagnosis
# Displays the communication status between audio unit (master unit) and each unit.
# The error counter displays OK if any malfunction was not detected in the past and displays 0 if a malfunction is detected. It increases by 1 if the condition is normal at the next ignition switch ON cycle.
The upper limit of the counter is 39.
# The error counter is erased if Reset is pressed
Items
Status
(Current)
Counter
(Past)
C Rx(Meter-ITM)
OK / ??? OK / 0 – 39
C Tx(ITM-TW SW)
OK / ??? OK / 0 – 39
C Rx(STW SW-ITM)
OK / ??? OK / 0 – 39
NOTE:
“???” indicates UNKNOWN.
Delete Unit Connection Log
Deletes any unit connection records and error records from the audio unit memory (clears the records of the unit that has been removed).
Version Information
Displays audio unit software and hardware version numbers.
Initialize Settings
Deletes data stored from the audio unit.
WIRING DIAGRAM
DISPLAY AUDIO
REMOVAL AND INSTALLATION
REMOVAL
1. Disconnect the negative battery terminal.
2. Remove A/C switch (AUTOMATIC AIR CONDITIONING) or front air control (MANUAL AIR CONDITIONING).
3. Remove instrument finisher
4. Remove instrument finisher
5. Remove the audio unit screws, then pull out the audio unit.
6. Disconnect the harness connectors from the audio unit and remove.
7. Remove the audio unit bracket (LH/RH) screws and the audio unit brackets (LH/RH) (if necessary).
INSTALLATION
Installation is in the reverse order of removal.

Star trac Pro Tread AC 7600 – 7700 – How to adjust the running belt tension – How to access Maintenance mode – Auto calibration – Treadmill repair and service


Star trac Pro Tread AC 76007700

RUNNING BELT RETENSION PROCEDURE  
Step 1: Release tension of running belt by unscrewing the tension screws until the roller touches the finger-guard. The belt should be completely relaxed.
(Note: This applies to both left & right fingerguards.)
Step 2: Apply a piece of masking tape on the edge of the running belt on both sides.
Step 3: Draw a line on each piece of masking tape aligned with the edge of the deck.
(Note: Be careful not to move the belt or roller while drawing the lines.)
Step 4: Check to make sure that both lines are aligned with the edge of the deck at the same point.
Step 5: Using a ruler or tape measure, draw a line on each piece of tape parallel to each first line at a distance of 3/8” (9.5mm) from each first line. 
Step 6: You are now ready to begin tensioning the belt. Before beginning, make sure the line on each piece of tape closest to the tail roller is aligned with the edge of the deck on each side.
Step 6: Using the 1/4" Allen wrench begin tightening the tensioning screws (see Fig 1). You will tighten (or stretch) the run belt until the forward lines on the tape are aligned with the edge of the deck.
Be careful to ensure the Tail Roller does not turn while you are stretching the belt. If the Tail Roller turns while you are stretching the belt, start the procedure over. If the Tail Roller turns while stretching the belt you will not obtain proper tension.
When finished, remove the tape from the running belt.
MAINTENANCE MODE
The Maintenance Mode allows you to query and modify the settings of the Star Trac product.
Engaging Maintenance Mode
1.Press and hold the 2 + 3 + start keys.
2.While holding all three keys release the key 2 only.
A beep will sound and the display will read “MAINTENANCE MODE” momentarily in the information window.
3. Once in the Maintenance Mode release all of the keys.
The display will read “UNITS: ENGLISH” (or “UNITS: METRIC”) depending on your settings.
You will now be in the Maintenance Settings mode for you unit. As a safety precaution, the unit will only stay in the Maintenance Mode for approximately 45 seconds after the last key stroke entry. As long as you are adjusting settings or scrolling through parameters, the unit will stay in mode.
Maintenance Mode Keys
The following keys are used to search through and modify the Maintenance Settings:
INCLINE keys: Display the next and previous parameters.
SPEED keys: Adjust the value of the displayed parameter up and down respectively. Some parameters can utilize the number pad.
ALPINE PASS: Sets parameter back to its default factory setting. Note: For parameter “LAST DECK” this key will set the parameter to the current “MILEAGE” value to clear the “REWAX BELT” message.
OK key: Updates (saves) the value of the display setting in the memory.
START key: Used to initially enter the Maintenance Mode and updates changed parameter values.
NUMBER PAD: Used to directly enter numeric values.
STOP key: Used to exit the Maintenance Mode.
TEST MODES
Within the Maintenance Mode parameters are a few Test Modes that can be used to test various functions of the unit. While in the Maintenance Mode, set the following parameter and use the functions as listed to utilize each parameter.
DISPLAY TEST
The Display Test can be used to test each individual key for function and response, and can
also be used to verify led function and display
Press ‘Start’ key Display will enter DISPLAY TEST and await your next command
Press ‘Start’ key Display will cycle thru a self test and display all led’s in a sequenced pattern.
Press ‘Stop’ key twice to return to the MAINTENANCE MODE
Press ‘Start’ key Display will enter DISPLAY TEST and await your next command
Press ‘1’ key MC1 Vx.x CKSM xxxx will display
Press ‘Speed Plus’ key MC2 Vx.x CKSM xxxx will display
Press ‘Speed Minus’ key MC1 Vx.x CKSM xxxx will display
Press ‘Stop’ key twice to return to the MAINTENANCE MODE
Press ‘Start’ key Display will enter DISPLAY TEST and await your next command
Press ‘2’ key Display will read KEYBOARD TEST
Press any key except ‘Stop’ to verify function.
Press ‘Stop’ key to verify function then press again to return to the MAINTENANCE MODE
You can also access the Display Test right away when entering the Maintenance Mode:
When the display reads UNITS: ENGLISH (or UNITS: METRIC), press the ‘5’ key then follow the procedures above.
MOTOR TEST
This parameter is used by Star Trac at the factory.
*For MOTOR TEST MODE, see the MOTOR TEST MODE section of this manual.
BELT/DECK TEST
This parameter is used by Star Trac at the factory
CALIBRATE SCALE
Press ‘Start’ key Display will enter CALIBRATE SCALE mode and scroll the following:
1 = INPUT SPAN WEIGHT
2 = CAL SPAN WEIGHT
3 = CAL ZERO WEIGHT
4 = VERIFY WEIGHT
PRESS STOP TO EXIT
 > Loop
Pressing ‘Stop’ will return to MAINTENANCE MODE
Press ‘1’ key Unit will read REF WEIGHT = 155
Enter your exact weight *It is advisable to weigh yourself for accuracy just before performing this step.
After entering your weight press either the ‘Start’ or ‘OK’ keys.
Display will read : STEP ON WEIGHT PADS
PRESS OK TO BEGIN
 > Loop
 Pressing ‘OK’ will read CALIBRATING X (X = your entered weight)
If no weight entered, unit will read:
CAN NOT CALIBRATE
NO WEIGHT ACQUIRED
PRESS OK TO RETRY
PRESS STOP TO EXIT
 >Loop
Pressing ‘OK’ will return to previous step
Pressing ‘Stop’ will return to MAINTENANCE MODE
Press ‘2’ key Display will read: PLACE CAL WEIGHT
ON WEIGHT PADS
PRESS OK TO BEGIN
 > Loop
After pressing ‘OK’ unit will read CALIBRATING X (X = calibrated weight)
If no weight entered, unit will read:
CAN NOT CALIBRATE
NO WEIGHT ACQUIRED
PRESS OK TO RETRY
PRESS STOP TO EXIT
 > Loop
Pressing ‘OK’ will return to previous step
Pressing ‘Stop’ will return to MAINTENANCE MODE
Press ‘3’ key Display will read: REMOVE WEIGHTS
PRESS OK TO BEGIN
After pressing ‘OK’ unit will read CALIBRATING X (X = weight zero)
If no load cells detected, unit will read:
CAN NOT CALIBRATE
NO WEIGHT ACQUIRED
PRESS OK TO RETRY
PRESS STOP TO EXIT
> Loop
Pressing ‘OK’ will return to previous step
Pressing ‘Stop’ will return to MAINTENANCE MODE
Press ‘4’ key Display will read: WEIGHT= 0 and display the weight as detected
Press ‘Stop’ key once to return to the CALIBRATE SCALE mode
Press ‘Stop’ key a second time to return to the MAINTENANCE MODE
AUTO CALIBRATION
Electrical voltages vary between locations. The treadmill can run through an auto-calibration process to allow the electronics to balance out with the speed control.
To run an auto-calibration procedure, do the following:
Auto-Calibration
DO NOT LEAVE THE TREADMILL UNATTENDED WHILE RUNNING THE AUTO-CALIBRATION PROCEDURE AS IT WILL RUN THE BELT TO THE MAXIMUM SPEED SETTING.
1. Enter the Maintenance Mode (see “Engaging Maintenance Mode”). The display will read:
2. Enter the Motor test mode by pressing the ‘8’ key once. The display will read:
3. Start the auto-calibration process by pressing the ‘Forest’ key once and immediately stepping off of the treadmill.
The center number (3) will begin to increase, running belt will move and the center number will on the right hand side of the display (0.0) will move .
The treadmill running belt will begin to move:
Running belt will move, center number will increase and the numbers on the right hand side of the display ‘0.0’ will move


Thursday, September 01, 2016

HTC Wizard 100 – How to replace the screen – How to replace the speakers – Mobiles and smartphones repair and service

Category: Mobiles and Smartphones repair and Service 

Contents of this article 

  • How to remove the case 
  • How to remove the mother board 
  • How to remove the screen 

HTC Wizard 100

DISASSEMBLING PROCEDURE 
Power the phone off.
Use your thumb to gently press downward and away from the camera to remove the battery cover.
Pull on the plastic tab to release the battery.
Use a plastic opening tool to remove the camera cover.
Work around the corners to avoid breaking the plastic clips that hold the camera cover on.
Lift the camera cover off of the phone.
Remove the stylus from the phone.
Remove the four 5.5 mm screws with the T6 Torx Screwdriver.
One of the screws might be under a sticker, which will void your warranty.
Be Careful! Do not insert the spudger in between the keyboard and screen. This could break the keyboard off the phone.
If your phone contains a memory card, you may want to remove it before proceeding with this step.
Insert spudger in the bottom corner as seen in the picture. Carefully slide the spudger from the bottom towards the top as seen in the second picture.
Lift the back case off completely.
The speakers might be dangling and unsecured.
Grip the speaker connector with your thumb and finger and gently pull up.
Repeat for 2nd speaker.
Locate the camera and pry off with the plastic opening tool or spudger.
Remove the 3.4 mm black screw with the Phillips #000 screwdriver.
Remove the plastic tape to reveal the connector.
Use your finger or plastic opening tool to flip the connector and release the cable.
Use the plastic opening tool to carefully lift the motherboard off one corner at a time.
Lift the motherboard slowly away from the keyboard because there is a cable attached to bottom of the motherboard.
If the motherboard is not easily removed by pulling, then lift one side of the motherboard until you can see the attached cable. Then use the plastic opening tool to detach the cable from the motherboard.
Using the Phillips Screwdriver #000 remove the four 3.3 mm screws.
Carefully lift the keyboard from the plastic plate by allowing the ribbon cable to slip through the opening of the plastic plate.
Use the Phillips Screwdriver #000 to remove the four 3.8 mm screws from the back of the screen.
Insert the spudger between the panel and the case.
Gently pry off the panel by rotating or wiggling the spudger back and forth.
Lift the panel off while allowing the ribbon to slip through the opening.
Remove the four 2.9 mm screws with the Phillips Screwdriver #000.
Use your fingers to separate the screen assembly from the front panel.
Insert the spudger between the green panel and the screen itself.
Gently wiggle the spudger to pry them apart.
Remove the tape.
Locate the connecting ribbon.
Using the spudger or your thumb and finger, flip the switch up and disconnect the ribbon.
Lift off the panel from the screen.

Wednesday, August 31, 2016

Apple iPhone 4 – How to replace the Wi-Fi Antenna – Mobiles and Smartphones repair and service

Category: Mobiles and Smartphones Repair and Service 

Contents of this article 

  • How to remove the case 
  • How to identify the screws
  • How to remove the wifi antenna 

Apple iPhone 4

WIFI ANTENNA REPLACEMENT PROCEDURE 
Before disassembling your iPhone, be sure it is powered off.
Your iPhone 4 rear cover may have either two #000 Phillips screws or Apple's 5-Point "Pentalobe" screws. Check which screws you have, and ensure you also have the correct screwdriver in order to remove them.
Remove the two 3.6 mm Pentalobe or Phillips #000 screws next to the dock connector.
During reassembly, we recommend you replace the 5-point screws with equivalent Phillips screws. The 5-Point Screwdriver should only be used once, as it has the potential to strip the screws.
Push the rear panel toward the top edge of the iPhone.
The panel will move about 2 mm.
Pinch the rear panel with your fingers and lift it away from the iPhone. Alternatively, use a Small Suction Cup .
Be careful not to damage the plastic clips attached to the rear panel.
If you are installing a new rear panel, be sure to remove the plastic protective sticker from the inside of the camera lens and the sticker from the large black area near the lens.
Remove the following five screws securing the wi-fi antenna to the logic board:
One 2.3 mm Phillips
Two 1.6 mm Phillips
One 1.4 mm Phillips
One 4.8 mm Phillips
When re-assembling, start off with replacing the 4.8 mm Philips screw first, then the 2.3 mm. This is to ensure there is no mix-up, and avoid rendering the LCD and digitizer useless.
Also make sure to put the long 4.8 mm Philips back in correctly when reassembling. This is the ground for the wi-fi antenna and is often the culprit if you are having bad wi-fi reception after reassembly.
Use an iPod opening tool to slightly lift the top edge of the wi-fi antenna away from the logic board.
Use the tip of a spudger to pull the wi-fi retaining clips away from the inner frame.
Remove the wi-fi antenna from the iPhone. Make sure you don't lose the metal clips on the top of the cover where the 4.8mm screw attaches or the 4.8mm screw. That's the primary reason for abnormal Wi-Fi performance after the reassembly.
Before reassembly, be sure to clean all metal-to-metal contact points on the connector cover with a de-greaser such as Windex. The oils on your fingers have the potential to cause wireless interference issues. Do not clean the connectors themselves with Windex.


HTC Maple 100 - Disassembling procedure – How to replace the front panel – Mobiles and smartphones repair and service

Category: Mobiles and Smartphones Repair and Service 

Contents of this article 

  • How to remove the battery 
  • How to remove the Key board 
  • How to remove the frond panel 

HTC Maple 100 

DISASSEMBLING PROCEDURE 
How to remove Battery
First remove the back cover of your phone to expose the battery.
Turn the phone over and remove the battery by using your thumb to push forward on the battery and then lift it.
Take the battery out
When reassembling, make sure that the battery contacts match up.
How to remove Back Panel
Remove the four 4.9mm T6 Torx screws that secure the back panel to the rest of the phone
Remove the two 4.3mm #00 Phillips screws that secure the back panel to the rest of the phone
Use the plastic opening tool to pry the clips off
Insert the plastic opening tool along the seams at different points to it pry up
This may require a bit of force. The USB port cover may fall off in this step.
Remove the one 3.3mm #00 screw.
Use your finger or the plastic opening tool to unclip the board.
Be aware of the ribbon cable connected to the motherboard inside the phone.
Peel off the yellow piece of tape from the phone
First flip up the retaining flap with your fingernail or a plastic opening tool.
Pull on the ribbon cable gently with your fingers
Split apart the motherboard and front panel. Remove the other yellow piece of tape off of the end of the ribbon cable.
Gently pull on the ribbon cable to separate the motherboard.
Remove the four 1.9mm #00 Phillips screws.
How to remove Keyboard
Peel back the tape gently with your fingers
Remove the board gently with your fingers
Remove the keys
Using the Plastic Opening Tool, pry out the LCD screen and remove with fingers.
Be gentle because the LCD screen is fragile.
Use the Plastic Opening Tool to remove the internal ear speaker.