Tuesday, April 04, 2017

Spirit treadmill – Spirit Z 900 – How to calibrate the treadmill – How to access Engineering mode – Treadmill repair and service

Spirit Z 900

Calibrating the unit
1. Remove tether cord.
2. Press and hold the START and FAST buttons. Replace the tether cord while maintaining the buttons. Display will show “FACTORY SETTING”. Press ENTER.3. Units English / Metric. Press UP or DOWN to change. Press ENTER.
4. Adjust wheel diameter using UP or DOWN. Should be 2.75. Press ENTER.
5. Adjust minimum speed to 0.5 using UP and DOWN. Press ENTER.
6. Adjust maximum speed to 12 using UP and DOWN. Press ENTER.
7. Adjust maximum elevation to 15 using UP and DOWN.
8. Press START to begin calibration. DO NOT STAND ON BELT DURING CALIBRATION.
Checking wire harness for continuity
1. Set your multimeter to read ohms.
2. Place the test leads at opposite ends of the wire, make sure both leads are on the same wire and are in contact with metal.
3. If the reading is close to 0 ohms, the wire has continuity (unbroken).
4. If the reading is very high or there is no reading at all, there is no continuity.
5. If there is no continuity, the harness needs to be replaced.
Speed sensor adjustment
1. Take off the motor hood.
2. The speed sensor is located on the frame, near where the drive belt goes around the front roller.
3. The sensor should be adjusted to about 1/16th of an inch from the front roller.
Checking treadmill circuit breaker
1. The circuit breaker is a small, red button between the power cord and the power switch.
2. Press the button in to reset.
Check roller for magnet
1. The front roller should have a round magnet and a round counter weight.
2. Take a screw or something metallic and test each one.
3. Only one should be magnetic.
Adjust Torque Boost1. Using a small screw driver, turn the dial counter clockwise until it stops.
2 Press the START button on the console.
3. With someone standing on the walking belt, turn clockwise until the belt begins to move.
4. Increase the speed and check for smooth belt movement.
Replacing controller1. Disconnect power cord from unit.
2. Remove motor hood.
3. Remove two Phillips screws holding in the controller.
4. Disconnect all wires connected to the controller.
5. Insert new controller, secure with Phillips screws.
6. Reconnect wires to controller. 
Replacing wire harness1. Turn power switch off.
2. Unplug harness from console and controller.
3. Tie the end of the new harness to the old harness (with a zip-tie or spare wire).
4. As you pull the old harness out of the upright, you will pull the new harness in.
5. Connect to board and console, & turn power back on.
Replacing drive motor1. Turn power switch off.
2. Disconnect red and black motor wires from controller.
3. Loosen tension bolt and remove four motor bolts.
4. Take off drive belt.
5. Insert new motor into place.
6. Put drive belt on.
7. Put in four motor bolts. Do not tighten them all the way down.
8. Tighten the tension bolt until you only have about an inch of play in the drive belt.
9. Tighten down the four motor bolts.
10. Plug the motor wires into the controller.
Replacing incline motor1. Turn power switch off.
2. If possible, fold up unit.
3. Turn treadmill onto its side.
4. Disconnect motor wires from controller.
5. Remove bolt from incline tube.
6. Remove bolt from top of incline motor and take out motor.
7. Insert new motor and put in bolt on the top.
8. Reconnect motor wires to controller.
9. Turn on unit. The new motor should turn until it is at “zero”.
10. Insert bolt into incline tube.
Engineering mode1. Remove the tether cord.
2. Press and hold the START, ENTER, and STOP buttons and replaced the tether
cord.
3. The display will say ENGINEERING MODE. Press ENTER.
4. Press the UP and DOWN buttons to scroll through the following sub menus:
-Calibration
-Factory Settings
-Security
-Functions
-Display Test
-Key Test
5. Press ENTER to access the desired program.
-CalibrationSpeed Calibration – In this mode, you can test the speed.
Incline Calibration – In this mode, you can test the incline.
-Factory SettingsThis mode will allow you to view the Wheel size, Max inc, Max and Min speed.
Use the UP and DOWN buttons to scroll through. (They cannot be changed here)
-SecurityChild Lock On/Off
Press ENTER to turn on or off. To unlock display, press START and ENTER.
-FunctionsSleep Mode On/Off. Press ENTER to turn on or off.
Units English/Metric. Press ENTER to change.
Maintenance
Lube Message Reset. Press ENTER to reset.
Odometer Reset. Press ENTER to reset.
Pause Mode On/Off. Press ENTER to turn on or off.
-Display TestTest all LED’s
-Key TestTest all buttons on console.

Friday, March 31, 2017

B&W Diamond Series - B&W 805D – Disassembling layout – Network circuit diagram – Audio system repair and service

Specification

2-way vented-box system
1x 25mm (1 in) diamond dome high-frequency
1x 165mm (6.5 in) woven Kevlar cone bass/midrange
-6dB at 42Hz and 33kHz
49Hz - 28kHz +/-3dB on reference axis
Within 2dB of reference response
Horizontal: over 60 Degree arc
Vertical: over 10 degree arc
88dB spl (2.83V, 1m)
2nd and 3rd harmonics (90dB, 1m)
<1% 100Hz - 100kHz
<0.5% 150Hz - 100kHz
8Ohms (minimum 4.7Ohms)
50W - 120W into 8Ohms on unclipped
Disassembling layout
Network circuit diagram
CLICK ON THE IMAGES TO ZOOM IN 

Saturday, March 04, 2017

LCD Monitor Bcaklight Inverter – Common faults

For a newer LCD Monitor design, the inverter board is joining together with the power board. Older LCD Monitor has the inverter board separated from the power board.
There are four types of inverter designs used in the LCD Monitors.
1) Buck Royer inverter
2) Push pull inverter (Direct Drive)
3) Half bridge inverter and (Direct Drive)
4) Full bridge inverter (Direct Drive)
Number 2, 3 and 4 are called Direct Drive because it eliminates the need for the inductor (buck choke) and resonant capacitors found in a conventional Royer Oscillator. In other words, Direct Drive architecture reduces component count, lower production cost and most importantly improved transformer designs that optimize performance.
1. Buck Royer Type Inverter
In order to drive the Backlights (CCFL lamps) embedded in the panel module, an inverter circuit is required to convert the 12 volt DC up to hundreds or even a thousand plus AC voltage output. The inverter is formed by symmetric circuitry, in order to drive the separate lamp modules. The input stage (buck converter circuit) consists of Inverter IC (PWM IC), Buck P-channel FET, Buck Choke and Buck Diode. The Buck converter circuit converts a DC voltage to a lower DC voltage. The other stage consists of a tuning capacitors, high voltage transformer, and push-pull transistor pair to boost ac output to hundreds of voltage.
The ballast capacitor controls current amplitude through the lamp negative impedance by dropping an approximately equal voltage across its positive impedance. The feedback circuit is for protection purposes and will shut down the inverter IC just in case if the high voltage produced by the high voltage transformer exceeded the normal value and also it can detect bad or a flicker backlights. The inverter IC also used to control the brightness of the CCFL lamps. The AC frequency of the high voltage transformer is typically run at 30 to 70 KHz. The higher the frequency, the greater is the light output.
Note: Some LCD Monitor design has the Buck type P-channel FET integrated into an IC thus in order to successfully testing them you can use the comparison method with another known good FET (comparing the ohms value between pins) or by using the Peak Atlas Analyzer test equipment. The IC can be in Dual in Line package or SMD type.
The common Buck P-channel FET is FU9024N, J598 and etc. The SMD FET IC’s are 4431, BE3V1J and etc. The common push pull transistors part numbers are C5706, C5707 and etc.
2. Push Pull Inverter (Direct Drive)
The push pull inverter shown above when Q1 switches on, current flows through the 'upper' half of T1's primary and the magnetic field in T1 expands. The expanding magnetic field in T1 induces a voltage across T1 secondary. When Q1 turns off, the magnetic field in T1 collapses and after a period of dead time (dependent on the duty cycle of the PWM drive signal), Q2 conducts, current flows through the 'lower' half of T1's primary and the magnetic field in T1 expand. Now the direction of the magnetic flux is opposite to that produced when Q1 conducted. The expanding magnetic field induces a voltage across T1 secondary. After a period of dead time, Q1 conducts and the cycle repeats. The above diagram only showing a single channel IC that is driving the Q1 and Q2. Some inverter IC can have two channels in order to drive two high voltage transformers. Each output from the transformer can drive more than one lamp.
3. Half Bridge Inverter (Direct Drive)
The half bridge inverter is similar to the push pull inverter, but a centre tapped primary is not required. The reversal of the magnetic field is achieved by reversing the direction of the primary winding current flow. This type of inverter is found in many LCD Monitor too. The control circuit of a half bridge inverter is similar to that of a push-pull inverter. This design has optimal utilization of transformer core and primary winding (one vs. two for push pull). The above diagram only showing a single channel IC that is driving the Q1 and Q2. Some inverter IC can have two channels in order to drive two high voltage transformers.
Each output from the transformer can drive more than one lamp
4. Full Bridge Inverter (Direct Drive)
The full bridge inverter is similar to the push pull inverter, but a centre tapped primary is not required. The reversal of the magnetic field is achieved by reversing the direction of the primary winding current flow.
This type of inverter is found in many latest LCD Monitors. Diagonal pairs of transistors will alternately conduct, thus achieving current reversal in the transformer primary. This can be illustrated as follows - with Q1 and Q4 conducting, current flow will be 'downwards' through the transformer primary and with Q2 and Q3 conducting, and current flow will be 'upwards' through the transformer primary. The control circuit monitors V out and controls the duty cycle of the drive waveform to Q1, Q2, Q3 and Q4. The control circuit operates in the same manner as for the push-pull inverter and half-bridge inverter, except that four transistors (FET) are being driven rather than two. In some LCD Monitor like the HP1703 that uses the OZ960 inverter IC, the output from inverter IC can parallel out to drive another high voltage transformer.
The full bridge inverter design has 4 IC’s (each IC have two FET (N and P channel)) in it. Two IC’s were used to drive each high voltage transformer.
The dual N and P channel PowerTrench Mosfet IC can be in SMD type or Dual in Line package
Common Faults 
1) Dry Joints (Very common in the buck choke and high voltage transformer pins)
2) Shorted or burnt high voltage transformers
3) Shorted or leaky push pull transistors
4) Capacitance value problems
5) Shorted buck P-channel FET
6) Inverter Pico fuse open circuit or turned high ohm
7) Ballast capacitors value out causing shutdown and brightness fluctuate
8) Burnt pins or loose connection in the backlights connector
Some common part numbers for inverter IC’s are TL1451ACN, 0Z960, 0Z962, 0Z965, BIT3105, BIT3106, TL5001 and etc.

Thursday, February 09, 2017

Sony STR-DA5800ES – Factory reset – Key check mode – Idle current adjustment

FACTORY PRESET MODE
The specific preset values are set.
Procedure:
1. While pressing the [TUNING] and [2CH/A.DIRECT] buttons, press the [POWER] button to turn on the main power.
2. The message “Factory Preset” appears and specific preset values are set.
SOUND FIELD CLEAR MODE
The preset sound field is cleared when this mode is activated.
Procedure:
1. While pressing the [MUSIC] button, press the [POWER] button to turn on the main power.
2. The message “S.F. Initialize” appears and initialization is performed.
FLUORESCENT INDICATOR TUBE DISPLAY TEST
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:
1. While pressing the [TONE] and [A.F.D.] buttons, press the [POWER] button to turn on the main power.
2. All segments and all LEDs turn on.
SWAP MODE
The signal will be swap to all channel so that all speaker will have sound output.
Procedure:
1. While pressing the [MEMORY/ENTER] and [2CH/A. DIRECT] buttons, press the [POWER] button to turn on the main power.
2. The message “SWAP MODE !” appears (No change while displayed).
SETTING LOCK ON/OFF CHANGE MODE
All the settings can be locked.
Procedure:
1. While pressing the [SPEAKERS A/B/A+B/OFF] and [MUSIC] buttons, press the [POWER] button to turn on the main power.
2. The message “SETTINGS LOCK [ ON]” appears.
Releasing method:
1. While pressing the [SPEAKERS A/B/A+B/OFF] and [MUSIC] buttons, press the [POWER] button to turn on the main power.
2. The message “SETTINGS LOCK [OFF]” appears.
COMMAND MODE CHANGE MODE
The command mode of the remote-commander which this set receives can be changed.
Procedure:
1. While pressing the [2CH/A. DIRECT] button, press the [POWER] button to turn on the main power.
2. Either the message “COMMAND MODE [AV1]” or “COMMAND MODE [AV2]” appears. Select the desired mode.
SOFTWARE VERSION DISPLAY MODE
The software version is displayed.
Note: In this mode, never press the [UP] and [DOWN] buttons on the remote commander.
Procedure:
1. While pressing the [TONE] and [MUSIC] buttons, press the [POWER] button to turn on the main power.
2. The model name/destination/system controller software version appears. Each time the [DISPLAY MODE] button is pressed, the version is switched in order.
(Displayed characters/values in the following figure are example)
Releasing method:
Press the [POWER] button to turn off the main power.
REBOX TEST MODE
Displayed the number of times of the power on after the shipment.
Procedure:
1. While pressing the [A.F.D.] and [SPEAKERS A/B/A+B/OFF] buttons, press the [POWER] button to turn on the main power.
2. The number of times of the power on after the shipment appears.
Releasing method:
Press the [POWER] button to turn off the main power.
KEY CHECK MODE
Each buttons can be checked.
Procedure:
1. While pressing the [MEMORY/ENTER] and the [MOVIE/HD-D.C.S.] buttons, press the [POWER] button to turn on the main power.
2. Either the message “REST 17” appears.
Every pressing of any button other than the [POWER] counts down the buttons.
(The buttons which are already counted once are not counted again)
3. When all buttons are pressed “REST 00” appears.
Releasing method:
Pull out the power cord, or do not perform operation for 10 seconds.
SPECIAL MENU MODE
Various version displays of system, update, test, etc. can be performed.
Setting method:
1. Press the [POWER] button to turn on the main power.
2. While pressing the [TONE] button, press the [A.F.D.], [2CH/A. DIRECT], [MUSIC], [MOVIE/HD-D.C.S.] button in order, the message “MENU SPECIALIZED !” appears.
3. Press the [AMP MENU] button of the remote commander, the message “<<< SPECIAL >>>” appears.
4. Press the [RIGHT] button of the remote commander, the item is appears.
5. Each time the [UP] or [DOWN] buttons of the remote commander is pressed, the item is switched in order of “Display of special menu mode”.
Some items can change the content. Display the cursor by pressing the [RIGHT] button of the remote commander, and changing the content by pressing the [UP] or [DOWN] buttons of the remote commander, and fix the content by pressing the [POWER] button of the remote commander when you want to change the content of the item.
IDLE CURRENT ADJUSTMENT
Note:
After 10 minutes or more have passed since the power supply was turned on, this adjustment is done.
Connection:
CN1561 (CN1611, CN1761, CN1861, CN4441, CN4491) pin 1, CN1561 (CN1761, CN1861) pin 3 – Positive terminal of digital voltmeter
CN1561 (CN1611, CN1761, CN1861, CN4441, CN4491) pin 2, CN1561 (CN1761, CN1861) pin4 - Negative terminal of digital voltmeter
Note: Pin 3, 4 of CN1611, CN4441, CN4491 are open.
Procedure:
1. Connect a digital voltmeter to the CN1561 (CN1611, CN1761, CN1861, CN4441, CN4491).
2. Press the [POWER] button to turn on the main power.
3. Adjust the RV1501 (RV1551, RV1601, RV1701, RV1751, RV1801, RV1851, RV4421, RV4471) so that the digital voltmeter reading is 5 mV to 20 mV.
Note: Adjust for the digital voltmeter reading to become 5 mV as much as possible.

Wednesday, February 08, 2017

Samsung BD-P4600 - BD-P4610 - deck adjustment – Firmware update – Touch key sensitivity adjustment

Recover Touch-Key Sensitivity
When assemble after disassembly, press number 86824 using remote control.
It means adjustment of the touch-key’s sensitivity to optimize in the current environment.
Step 1 : Open tray mode.
Step 2 : Press number 86824 using remote control.
Step 3 : Verify the message on front display then automatically close tray.
Step 4 : Press the ENTER button to complete.
Deck Adjustment
When assemble after disassembly, press number 235878 using remote control It means the function to reset pick-up condition through auto adjustment of loader.
Step 1 : No disc mode.
Step 2 : Press number 235878 using remote control.
Step 3 : Verify the message ‘Adjusting’ on screen.
Step 4 : Open tray. And then, insert single sided Blu-ray Disc.
Step 5 : After playback, insert single sided DVD disc.
Step 6 : Eject disc after playback then complete.
Verification of Deck Adjustment information
Press button 235879 using remote control.
And then, you can see this message.
Cold Start Method(initialize setup)
This is useful for forgotten Parental Lock password.
Press Next on the front panel for over 5 seconds while 'no disc' status.
VFD sign : RESET
How to check F/W version
Method 1
Step 1 : open the tray.
Step 2 : press and hold INFO button on the remote over 5 seconds.
Method 2
Press 'MENU' on the remote controller.
Setup – System Setup – System Information.
Front : Front Micom F/W
S/W : Blu-ray Disc, DVD, CD, Main (Updatable)
Loader : Loader F/W (Updatable)
Region : BD region code / DVD region code
Update methods
USB Update

The file type of firmware is RUF.
If the firmware file is compressed ZIP or RAR the file should be uncompressed to RUF file.
CD Update
The file type of firmware is ISO.
If the firmware file is compressed ZIP or RAR the file should be uncompressed to CD image file ISO.
F/W Update Method by USB flash drive
How to prepare F/W Update file via USB flash drive
If the firmware file is compressed , the file should be uncompressed to RUF file.
Connect a USB flash drive to your computer.
If there are previous versions of RUF file on.
USB flash drive, delete them.
Copy the new RUF file to USB flash drive.
How to upgrade the BD-P1600
Remove any Disc, the display should read "No Disc."
Insert USB flash drive into the USB Host jack.
Please wait while verifying.
After sometime, you will see "Yes/No" menu.
Press the 'Enter' button to choose 'Yes' if the version is a later version than the current one.
Wait about 2>3 minutes.
When finished, the power will turn off automatically.
Remove the USB flash drive.
F/W Update Method by CD
How to make an upgrade CD

If the firmware file is compressed ZIP, the file should be uncompressed to CD image file ISO.
Please burn the CD image file on a blank CD-R/RW disc.
How to upgrade the BD-P1600
Insert the update CD and close the tray.
Please wait while verifying.
After a while, the tray will open and you will see 'Yes/No' menu.
Press 'Enter' button to choose 'Yes' if the update CD you inserted is a later version than the current one.
Remove the update CD from the Disc Tray.
Wait about 2>3 minutes.
When finished, the power will turn off automatically.

Tuesday, February 07, 2017

Yamaha YST-FSW150 – Disassembling procedure – Power amplifier circuit diagram

1. Removal of driver
a. Turn the main unit bottom up.
# The bottom grille is fixed to the cabinet with dowels at 4 locations. As a flat blade screwdriver is used for removal, use special care not to cause damage to the cabinet.
b. First, insert a flat blade screwdriver at 4 dowel positions and push up the bottom grille.
c. Next, using the metal blade or the like, push the bottom grille upward until it comes off.
d. Remove 4 screws (1) and then pull out the driver. 
e. Disconnect the connector connected to the terminal of the Driver.
2. Removal of bottom panel 
a. Remove 2 screws (2) and then remove 2 legs.
b. Remove 12 screws (3).
# Screws (3) are identified with arrow marks ( >).
c. Pull out the bottom panel.
d. Remove CB1-5 and then remove the bottom panel.
3. Removal of front panel
# The front panel is fixed to the cabinet with dowels. As a flat blade screwdriver is used for removal, use special care not to cause damage to the cabinet.
a. Remove 2 bushings.
# Used bushing, once removed, cannot be reused. Be sure to use a new bushing in place of the removed used bushing.
b. First, insert a flat blade screwdriver at 2 dowel positions and push up the front panel.
c. Next, using the metal blade or the like, push the front panel upward until it comes off.
4. Removal of rear panel 
a. Remove 8 screws (4).
# Screws (4) are identified with arrow marks ( >).
b. Remove the rear panel.
c. Remove 2 bushings.
# Used bushing, once removed, cannot be reused. Be sure to use a new bushing in place of the removed used bushing.
d. Remove 4 screws (5) and then remove the rear cover.
POWER AMP CIRCUIT DIAGRAM 
CLICK ON THE IMAGES TO ZOOM IN 

Denon AV Receiver - Denon AVR-1311 - AVR-391 – Special mode – How to Initialize the AVR – Idle current adjustment

Initializing AV SURROUND RECEIVER
1. Turn off the power using ON/STANDBY button.
2. Press ON/STANDBY button while simultaneously pressing SURROUND MODE  LEFT and SURROUND MODE RIGHT buttons.
3. Check that the entire display is flashing with an interval of about 1 second, and release your fingers from the 2 buttons and the microprocessor will be initialized.
SPECIAL MODE
Special mode setting button
# Press the ON/STANDBY button to turn on while pressing both buttons A and B at the same time.
Mode
Button A
Button B
Contents
ucom/DSP Version display mode
STATUS
DIMMER
Firmware versions such as Main, DSP are displayed in the FL display. Errors are displayed when they occur.

Initialization mode
SURROUND
MODE LEFT
SURROUND
MODE RIGH
Backup data initialization is carried out.
Mode for switching tuner frequency step
SURROUND
MODE LEFT
RESTORER
---E2 model only---
Change tuner frequency step to AM9k/FM50kHz STEP or AM:10k/FM:200kHz.
Mode for preventing remote control
acceptance
SURROUND
MODE LEFT
STATUS
Operations using remote control are rejected. "REMOTE LOCK:ON" is displayed in FL display.
(Mode cancellation: Turn off power and execute the same button operations as when performing setup.)
ucom/DSP Version display mode
When started up, the version information is displayed.
Starting up:
With the "DIMMER" and "STATUS" buttons pressed, press the "ON/STANDBY" button to turn the power on.
Now, press the "STATUS" button to the display the 2nd item information on the FL Display.
Cleared of mode:
Press the "ON/STANDBY" button to turn the power off.
Idling Current
Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room temperature
15 Degree C > 30 Degree C.
(2) Presetting
# POWER (Power source switch) OFF
# SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)
2. Adjustment
(1) Remove top cover and set VR41(FL),VR45(FR),VR42(C),VR44(SL),VR43(SR), on Main Amp. Unit at fully counterclockwise position.
(2) Connect DC Voltmeter to test points (Front-Lch:CN51,Front-Rch:CN55,CENTERch:CN53, Surround-Lch:CN52,Surround-Rch:CN54).
(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise (c min.)
SPEAKER (Speaker terminal) : No load
(Do not connect speaker, dummy resistor, etc.)
FUNCTION : DVD
(5) Within 2 minutes after the power on, turn VR41 clockwise to adjust the TEST POINT voltage to 1.5 mV ± 0.5 mV DC.
(6) After 10 minutes from the preset above, turn VR401 to set the voltage to 2.0 mV +/- 0.5 mV DC.
(7) Adjust the Variable Resisters of other channels (VR42-VR45) in the same way.
ADJUSTMENT LOCATION 
CLICK ON THE IMAGE TO ZOOM IN  

Pioneer Pro-grade digital DJ deck - Pioneer CDJ-2000NXS – Service mode – Self diagnosis – Error code and cause – Power supply circuit diagram


SERVICE MODE
The following service modes are prepared for this unit.
1. Confirmation of the button input and an indication function.
It is the mode which checks each input and display function of a button, a JOG dial, the slider volume, a encoder and a needle pad.
2. Check mode of the load of JOG dial.
It is the mode which measures the load when rotating JOG dial.
3. Indication of various information
It is a mode displaying information such as a version and an error history, a device normal / abnormality judgment.
4. Error display list
An error code and the contents are shown.
5. Drive Self-Diagnosis
It is the mode which performs self-diagnosis of a drive unit.
6. Contents of drive self-diagnosis
It is explanation of the contents of self-diagnosis of a drive unit.
7. Confirmation of movement of the drive unit
It is the mode which checks operation of a mechanism and servo of drive unit.
8. Output of the alarm port
Explanation of the meaning of output of status terminal on a PC Board.
9. Firmware update.
Explanation of the method of firmware update.
HOW TO ENTER TO SERVICE MODE
When it spends a power supply while pushing a TEMPO button and a MEMORY button simultaneously, It is displayed in the LCD display part, "CDJ-2000NXS SERVICE MODE", and enters into this mode.
When it enters this mode, the TAG-TRACK button is pushed, and the screen will show on the display.
In this mode, the input of each button, JOG, volume, etc. is normal, and it can check that a display can also be performed normally.
In addition, indication turns on while you push a button.
Error display
Error
code
CAUSES
Contents
E-7001
DISC DRIVE ERROR
The ATAPI drive doesn't function normally.
E-8304
UNSUPPORTED FILE FORMAT
The decoding error occurred.
E-8303
CANNOT PLAY TRACK
The error of buffer memory writing occurred
E-8305
UNSUPPORTED FILE FORMAT
It is the format which is not supported.
E-8306
NO FILE
The registered file does not exist.
E-8307
USB ACCESS ERROR
USB apparatus which is not supported was connected.
E-8308
SD CARD ACCESS ERROR
MMC (Multi Media Card) was connected.
E-8309
LINK ACCESS ERROR
It ended in the error of the timeout of continuation 4 times.
E-9101
MECHANICAL TIMEOUT
Mechanism operation was not completed within regulation time.
E-8709
COMMUNICATION ERROR
GUI CPU and MAIN CPU cannot be communicated.
E-8302
CANNOT PLAY TRACK
Abnormalities occurred during playback.
E-8301
CANNOT READ DISC
Abnormalities occurred during starting.
E-7201
CANNOT READ DISC
TOC Data can't be read.
E-7101
INTERRUPT EXCEPTION
The abnormalities which are not expected on a main CPU occurred.
E-7206
AUTH CHIP ERROR
Apple authentication tip does not operate normally.
E-7025
CDC DEVICE ERROR
CDC for needle pads does not operate normally.
E-7024
MAIN CPU ERROR
The main CPU doesn't function normally.
E-7023
GUI CPU ERROR
The GUI CPU doesn't function normally.
E-7022
PANEL CPU ERROR
The panel microcomputer doesn't function normally.
E-7021
PHY CHIP ERROR
The PHY CHIP doesn't function normally.
E-7020
USB-B DEVICE ERROR
The USB-B controller doesn't function normally
E-7010
DSP DEVICE ERROR
The DSP doesn't function normally. 
Drive Self-Diagnosis
Self-diagnosis of a drive is performed through three steps.
It waits to push a button, after are displayed as [Push PLAY Button] at the beginning of each step and inserting a predetermined disc.
If a disk is inserted and PLAY button is pushed, a display of [Executing--] will blink and diagnosis will be started.
After diagnosis is completed successfully, it is displayed as [Complete] and a disk is ejected automatically.
Contents of drive self-diagnosis
(1) CD-LD LIFE CHECK
The addition time which LD had turned on is checked and degradation condition is judged.
If addition time is over 7000 H, display it with NG. NG judgment reason: Because the Laser Diode becomes 1% of the rate of failure in 7000 H or more. Over 7000 H in the case of "NG", you measure LD current, and perform failure judgment of the Pickup.
(2) DVD-LD LIFE CHECK
Same as the above.
(3) FOCUS ACTUATOR CHECK
To detect the disconnection of the actuator. Current is passed to an actuator using an external circuit, and a disconnection part is detected by reading the  voltage value divided by resistance by A/D. State of FFC connector mounting, state of FFC insertion, and disconnection of the actuator are detected synthetically. Since the probability which Focus and Tracking both disconnect is low, as for the case of both NG, suspect FFC insertion.
(4) TRACKING ACTUATOR CHECK
Same as the above.
(5) STEPPER CHECK
To detect "A stop of the Stepper by foreign substance mixing, the stack, etc", "the defect of an inside switch", and "the step-out of the Stepper by the shortage of lateral-pressure with faulty mechanism parts". It checks that the Stepper can perform predetermined operation certainly using an inside switch.
(6) OEIC CHECK
To detect omission of OEIC.
It detects by checking disk existence using CD.
(7) DISC MOTOR CHECK
To detect the defect of a spindle motor.
A motor is started and the attainment time to 2000 rpm is checked.
(8) CD-LD POWER & LENS DIRT CHECK
It checks whether CD-LD power adjustment is appropriate and whether the object lens is dirty.
The peak value and bottom value of the main beams A, B, C, and D are measured by A/D, and it judges whether it is the level which can continue a playback.
(9) OPTICAL SYSTEM DIRT CHECK
Same as the above.
(10) CD ERROR RATE CHECK
An error rate is measured and the last check is performed.
(11) DVD-LD POWER CHECK
It checks whether DVD-LD power adjustment is appropriate and whether the object lens is dirty.
The peak value and bottom value of the main beams A, B, C, and D are measured by A/D, and it judges whether it is the level which can continue a playback.
(12) DVD ERROR RATE CHECK
An error rate is measured and the last check is performed.
(13) USER CD PHYSICAL CHECK
When there is offer of a disc from a user, it distinguishes whether it is that a disc is the cause.
The characteristic of a user disk is checked from automatic adjustment value.
A disk uses only CD (from a past actual result).
(14) USER CD SCRATCH CHECK
The error rate of the whole disk is measured per 1 minute, and best value and worst value are calculated.
The state of a disc is checked from those relations.
(15) USER CD QUALITY CHECK
Same as the above.
(16) USER CD DIRT CHECK
Same as the above.
POWER SUPPLY CIRCUIT 
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