Used Semiconductors - L6599D_14NK50(FET)_LM324_NCP1653A_8N50(FET)_FSQ0265
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Monday, October 27, 2014
TOSHIBA LC3245 – TOSHIBA LC1945 – POWER SUPPLY and BACK-LIGHT INVERTER SCHEMATIC
Used ICs and Semi-conductors
FSCW0765
_ OZ9939 _ AP9971M _ Similar Circuit used in [KONKA
LIPS 22]
TOSHIBA - LC3245 - SMPS SCHEMATIC & PARTS LIST
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LCD DIGITAL LCD TV - SONY KDL-32EX725_40EX725_55EX725 - Circuit Boards layout and Functions
Sony KDL-32EX725_40EX725_55EX725 – LCD
DIGITAL TV _ Boards layout to different models
to this LCD TV & the function details
Universal Remote Control Set-up Code list [With different brand remote controls to Sony TVs]
Television system:
Analog: NTSC 3.58/ PAL-M / PAL-N
Digital: SBTVD
Channel coverage:
VHF: 2-13, UHF: 14-69
CATV (Analog): 1-135
COMPONENT IN
YPBPR(Component Video)
Signal format: 480i, 480p, 576i,
576p,720p, 1080i, 1080p
AUDIO
HDMI IN 1/2/3/4
HDMI: Video: 480i, 480p, 576i,
576p, 720p, 720/24p/30p, 1080i, 1080p, 1080/24p/30p
HDMI: Audio: Two channel linear
PCM 32, 44.1 and 48 kHz, 16, 20 and 24 bits, Dolby Digital
Analog audio input (minijack)
(HDMI IN 4 only)
ARC (Audio Return Channel) (HDMI
IN 1 only)
Speaker output: 10 W + 10 WCIRCUIT BOARDS' LAYOUT AND FUNCTIONS DETAILS
The primary circuits contained in
the AZ2-F chassis for the consists of a Main Board (designated as the BATV
board), Power Supply Board (designated as the G10A Board for the 32” models,
G4B Board for the 40” models, and G6A Board and G8A Board for the 55” models),
the Motion Sensor (HMS3 Board), the IR Board (HLR2 Board), the Switch Unit, and
the LCD Panel assembly.
MAIN BOARD
Common to all models the Main
Board, designated as the BATV Board, contains the TV control, video, and audio
processing circuitry. All these
functions are accomplished using the X-Reality Processor.
TUNER
The tuner is a combination
ATSC/NTSC unit. It can receive traditional analog NTSC signals via cable or
terrestrial along with ATSC digital signals via terrestrial (8VSB) or cable (64
or 256 QAM)
AUDIO AMPLIFIER
The audio amplifier (IC4601)
amplifies the digital audio output of the X-Reality processor and sends it to
the speakers.
TEMPERATURE SENSOR
The temperature sensor detects
over-temperature conditions on the Main Board, LCD Panel, or ambient room
temperature and sends the shut-down signal to the processor.
X-REALITY PROCESSOR
IC9000 performs the majority of
the necessary audio and video processing on the main board. TV Microprocessor: The CPU internal to the X-Reality
processor controls all aspects of the television functions. Input from the user
along with monitoring of critical circuits is also performed by this CPU. Digital Audio and Video Decoder: The MPEG2
and Digital Dolby audio streams are received from the tuner for decompression.
All video sources which are not native 1920 X 1080p 60HZ are scaled to this
resolution. Digital audio content is output to the class D amplifier for
processing and amplification.
HDMI Input and Switching: The
customer can select the HDMI1, HDMI2, HDMI3, HDMI4 input. Each HDMI input
contains a common EDI NVM (not shown) to provide display information data to
any device connected via the HDMI inputs.
LVDS Transmitter:Integrated into IC9000 is a Low Voltage Differential
Signalling (LVDS) transmitter. This circuit converts the 8-bit parallel RGB
video information into a set of high speed serial lines for noise-free transmission to the T-CON
circuits located internally to the LCD panel.
Scan Converter: Signal processing circuit that performs resolution
conversion (aspect ratio) and interlaced to Progressive scan (IP) conversion.
POWER SUPPLY
There are different Power Supply
Boards used in the models in this manual. The type of board depends on the size
of LCD panel. They are:
G10A-Board (32”)
G4B-Board (40”)
G6A-Board (55”)
Note: the G8A in the 55” models
is the Power Supply Board for the Panel LED backlight system. There are 2 distinct sections on the power
supply:
Standby Supply: Continuously
operational as long as AC power is applied, the standby supply generates 3.3V
for the circuits requiring power while the unit is turned off. An unregulated
19V line is present to provide power to the main relay, PFC and main power
supply at turn-on.
Main Supply: Once the
power supply receives a power-on command from the CPU on the Main Board, the
main switching supply is turned on to provide a regulated 12V source and a
regulated 24V source for the LED power supply circuits.
POWER SUPPLY FOR BACKLIGHT SYSTEM
The G8A-Board is the Power Supply
Board for the Panel LED backlighting system (including the LED Driver Board)
for the 55” model only. 390V, 19V, and 12V are applied to the board from the
G6A Board to develop the 24V. The 24V is applied to the LD Driver board.
LD BOARD (LED DRIVER BOARD)
The LED Driver Board is
controlled by the T-CON/HFR Board to perform overall backlight power-on,
backlight level, and local dimming
functions. This board takes the 24V from the Power Supply Board (or G8A
Board for the 55” models) and develops the negative and positive voltages to
directly drive the LEDs in the panel assembly.
3D IR EMITTER
Designated as the HEM2 Board,
this board is the internal 3D IR Emitter.
SWITCH UNIT
This board contains the power,
channel, and volume up/down and menu buttons.
MOTION SENSOR BOARD
Designated as the HMS3 Board, the
Motion Sensor Board contains the circuits for the Motion Sensor. The Motion
Sensor detects when there is movement in front of the TV. If there is no
movement in front of the TV after a predetermine amount of time the back-light
is turned off (audio present). After an extended period of time the TV is
completely turned off.
IR BOARD
Designated as the HLR2 Board, the
IR Board contains the power, standby, and timer LED’s are located on this board
along with the IR remote receiver and light level sensor.
LCD PANEL ASSEMBLY
The LCD Panel Assembly includes
the LCD Panel, T-CON Board, and LED Backlight system.
NOTE: The LD Board is not
included with the LCD Panel. The LCD
Panel contains the actual liquid crystals, color filters, and polarizers. The
liquid crystals are manipulated by the applied voltage to pass a specific
amount of light - from the backlight- depending on the level of voltage
applied. The T-CON performs all the
control, timing, charge, and discharge functions driving the operation of the
LCD Panel. A new LCD Panel assembly from
parts will include the following items.
LCD Panel
LED Backlighting Components
T-CON Board
T-CON BOARD
The T-CON Board communicates
between the LCD Panel and the microprocessor on the Main Board.
(NOTE: The
T-CON Board is not available as a replacement part for all models.)
UNIVERSAL REMOTE CONTROL SET-UP CODE LIST
0018 0045 0101 0131 0154 0177
0211 0301 0302 0357 0358 0609 0785
Sunday, October 26, 2014
KDL-32EX725_KDL-40EX725_KDL-55EX725 SONY LCD Digital Color TV_SOFTWARE UPDATE AND OTHER DETAILS
SONY KDL-32EX725_KDL-40EX725_KDL-55EX725
LCD Digital Color TV_SOFTWARE UPDATE AND OTHER DETAILS {AZ2-F Chassis Segment: 3a-2}
The televisions of today have
advanced to the point where they are not simply a television anymore. They are
evolving into devices that are designed to integrate with numerous other
devices found in the home. Some examples are: Portable audio and video devices,
still cameras, home computer networks and accessing the internet to name a
few. Communications with these varying
devices requires that the television be compatible with varying communications
protocols. Although standards are
detailed for each of these protocols, the real world dictates that occasional
errors may occur that could prevent devices from operating or communicating
properly. Keeping the software in the
television up-to-date is a procedure that is normally handled by the owner of
the television. Most customers who own computers and other digital devices are
familiar with and are accustomed to updating the software in their products. If
a customer contacts the Sony Customer Support Centre and it is deemed to be
correctable with a software update, the issue is handled at the customer level.
SOFTWARE UPDATES FOR SERVICE PERSONAL
The models in this manual utilize
a “generic” type Main Board. In the past, many different Main Boards needed to
be stocked due to differences in software requirements. The software loaded on
the board was specific to the model and its features along with the type of LCD
panel installed during production. Replacement Main Boards are now stocked with
basic software. Once the replacement board is installed in the unit, the most
current software needs to be installed using a USB thumb drive containing the
necessary software downloaded. This new
method of supplying Main Boards significantly reduces the complexity of
replacing LCD panels and Main Boards. Information about the LCD panel is stored
on the T-CON circuits. This information is automatically loaded onto the Main
Board when the TV is powered up. With the correct software version the Main
Board and/or the T-CON or LCD panel can be replaced more efficiently. In
addition to software installation, service adjustment information may need to
be modified or verified to complete the service of the TV.
SOFTWARE UPDATE RESPONSIBILITY
Software updates are designed to
be performed by the customer. Warranty
repairs in which the issue can be resolved by a software update are not
reimbursable. Most issues involving software updates are handled by the
customer service center and should not be directed to an authorized service
center. It is the responsibility of the servicer to prevent service calls for
issues that involve software updates. Exceptions to this are certain cases
whereby the customer is unable or unwilling to perform the task. In this
situation, the service will be notified and receive the proper authorization
for reimbursement.
CONTACT
THE AUTHORIZED SERVICE CENTRE FOR SONY TO GET MORE DETAILS ABOUT THE SOFTWARE
UPDATE AND TO GET THE LATEST SOFTWARE.
It is advised to allow them to do this work, as it is a skilled one.
CHECKING THE SOFTWARE VERSION
The easiest way to check the
version of software that is currently on the TV is to access the Contact Sony
screen by using the customer menu.
EXAMPLES OF SOFTWARE CORRECTABLE
SYMPTOMS
Most symptoms that are
correctable by software updates involve communications issues with other
devices or minor glitches in the operation of a specific function. Below is a
list of some of the symptoms that may be corrected with a software update:
* Fluctuations in picture
brightness
* Intermittent picture freezing
or noise
* Problems with certain inputs
(especially HDMI)
* Intermittent or distorted audio
* Erratic remote control
operation
* Unit turns on and off by itself
* Loss of color
* Internet connectivity
* certain features not working
correctly (photo or video file viewing)
TO ENTER SERVICE MODE
TV must be in standby mode.
(Power off).
Access Service Mode by pressing the following
buttons on the Remote Commander within a second of each other.
DISPLAY > CHANNEL-5 > VOLUME {+} > POWER
The DIGITAL Service Menu
displays.
NOTE: There are 3 Service Menus
for this model,
DIGITAL, CHASSIS, and VPC.
> If the
DIGITAL Service Menu is not displayed, press JUMP or OPTIONS on the Remote
Commander.
VIEWING OR CHANGING SERVICE DATA
Within each Service Menu are
Categories and data information.
Use the buttons on the Remote
Commander to review or change the service data.
>> To change the Category, press 2
to move to the Next Category or press 5
to go back to the Previous Category. {Note: Pressing 2 or 5 only changes the
Categories within the Service Menu displayed.}
>> To change the adjustment item, press
1 to move to the Next Item or 4 to go
back to the Previous Item.
>> To change the Data Value, press 3 to increase
the Data Value or 6 to decrease the Data Value.
>> Press MUTING then press 0to WRITE (Save) the changes.
>> To exit service mode, press HOME
or turn the TV power off.
VERIFYING SERVICE ADJUSTMENTS
The following procedures should
be performed after updating the software to ensure that the service adjustment
data is accurate.
* Verify the Segment Code
* Verify the Destination
* Verify the Model Name
VERIFYING THE SEGMENT CODE
After updating the software, go
into Service Mode to verify the Segment Code data value is set.
CAUTION: Selecting the incorrect
destination may require replacing the Main Board.
* TV must be in standby mode. (Power off).
* Access Service Mode by pressing the following
buttons on the Remote Commander within a second of each other:
DISPLAY Ã CHANNEL-5 Ã VOLUME + Ã POWER
Press 2 to move to the 002 MODEL category.
Using the table, press 3 to
increase the data value or 6 to decrease the data value, to select the correct
segment code data value.
VERIFYING THE DESTINATION & THE
MODEL NAME
The correct model may need to be
selected after updating the software.
Press 1 to move to the 001 DEST item. Using the table, press 3 to increase the data
value or 6 to decrease the data value, to select the correct destination of the
TV.
The correct model may need to be
selected after updating the software.
Press 1 to move to the 002 MODEL item.
If the correct model does not
display, press 3 until the model displayed matches the model of the TV.
Press MUTING then press 0 to
WRITE (Save) the changes.
To exit service mode, press
HOME or turn the TV power off.
RESETTING THE TV TO FACTORY
CONDITION
Use the following instructions to
restore the User Adjustments and Channel Memory settings to the preset factory
conditions.
> While holding down the ▲ on the Remote Commander, press
the POWER button on the TV Switch Unit of the set.
> The set restarts and displays the Initial
Setup screen. This may take several minutes.
RESETTING THE TV TO FACTORY
CONDITION USING SERVICE MODE
> TV must be in standby Mode. (POWER off).
> Press the following buttons on the Remote Commander
within a second of each other:
DISPLAY > Channel 5 > Volume + > POWER.
> If necessary, press JUMP or OPTIONS to go to DIGITAL
mode.
> Press 8.
“SERVICE” changes to green RST.
> Press MUTING.
RST executes the command and displays EXE.
> Press 0.
EXE-RST displays green, then red indicating the TV is writing the
data. When the process is complete the
green SERVICE text displays and the LED display.
> Cycle AC Power (Unplug and Plug AC Cord from
the AC Outlet). The set restarts and
displays the Initial Set-up screen. This may take several minutes.
SONY KDL-32EX725 - KDL-40EX725 - KDL-55EX725 – LED BLINKING (Error) CODES and FAULT DETAILS
KDL-32EX725 RM-YD062 CHILE/PERU | KDL-32EX725 RM-YD062 VENEZUELA
KDL-40EX725 RM-YD062 CHILE/PERU | KDL-40EX725 RM-YD062 VENEZUELA
KDL-55EX725 RM-YD062 CHILE/PERU | KDL-55EX725 RM-YD062 VENEZUELA
LED Blinking Codes [Error Codes] & Self Check Function
If an error occurs, the standby
LED will automatically begin to flash. The number of times the LED flashes
translates to a probable source of the problem.
If there is more than one error,
the standby LED will identify the first of the problem areas. If the Self check
screen displays a “0”, no error has occurred.
2X Blink - Main Power Error: A 2X protection mode blink pattern can be
activated due one of the following defects.
* Loss of REG12V (LVP)*
* Loss of -125V (Single Line)
* Excessive -125V Level (OVP)*
* Loss of Power-ON Signal
* Excessive PFC Voltage (OVP)
* Excessive PFC Temperature (OTP)
# Low Voltage Protection (LVP)
# Over Voltage Protection (OVP)
A loss or excessive condition of
the REG12VDC secondary voltage from the main power supply IC6351 will cause a
2X blink pattern on the standby LED. The 12Vdc can be checked at CN6704/pin
16. If the measurement is 0V or rises
above 12Vdc (approaches 15V) before the TV shuts down the Power Supply Board is
defective. If approximately 12Vdc is present and remains below 12Vdc before
shutdown then further troubleshooting is necessary to determine the defective
component. After confirming proper
REG12V levels, check the Negative LED Backlight supply levels. A loss or excessive
condition of the negative supply will cause a 2X blink failure. The voltage
level can be checked at CN6701/pins 1 & 3 before the TV shuts off. There
will be 2 to 4 wires (Red & Blue) depending on the panel size. All
individual wires should be checked for
proper voltage level. In normal operation the voltage level will initially rise
to approximately -175V and then should
Regulate down to between 89V and
125V depending on the Back light adjustment in the User Menu. If one of the
negative supplies is 0V or rises above -175V before shut-off then the Power
Supply Board is defective, replace it to fix the problem. A defective X-Reality processor on the Main
Board or Switch circuit on the Power Supply Board will cause a loss of the
Power-ON signal (2X). To determine which component is defective check the
Power-ON voltage level at CN6704/pin 1. In normal operation 3V should be
measured. If the 3V is present before shut-off then the Power Supply Board is
defective. If 0V is measured before shut-off then the Main Board is defective. Finally, there are PFC protection circuits on
the Power Supply Board that when activated will cause a 2X blink protection
mode. The PFC circuit is monitored for both over-voltage and over-temperature. Therefore, if all the previously discussed circuits checkout okay, there could
still be a problem on the Power Supply Board in the PFC circuit causing the 2X
blink. Replacing the Power Supply Board will fix the TV.
3X Blink- DC Regulator/Audio
Error: The Audio error can occur due on
of the following error conditions.
Defective DC Regulator on Main
Board
Shorted or Damaged Speaker
Connections
Defective Audio Amplifier (Main
Board)
Loss of AU12V (Open F4200 on Main
Board)
Loss of AU12V (Open Fuse on Power
Supply Board)
The first thing to check when a
3X blink protection mode occurs is the physical condition of the speakers and
speaker connections. The speakers should measure 8 ohms. Shorted speakers or
connections can cause a 3X blink protection mode. If the speakers and connections check okay,
then the defective component is on the Main Board. An open F4200, defective DC
Regulator, or defective Audio amplifier will cause a 3X blink protection mode.
In any of these cases, replace the Main Board to fix this condition. A defect on the Power Supply Board can cause
a 3X blink protection mode and shut-off. Check the AU12V level at
CN6704/pin 14. If 0V is measure before 4X Blink – Balancer Error.
The 4X error code is only used on
models incorporating local dimming LED back-lighting. If a failure occurs on the
LD board the TV will shut down and display this diagnostic code. Models using
conventional non-local dimming LED back-lighting do not utilize this error
code.re shut-off the Power Supply Board is defective.
5X Blink - T-CON Error
The 5X blink protection mode
indicates a communications error between the T-CON Board and the X-Reality
microprocessor on the Main Board. If the T-CON is available for replacement,
replace the T-CON. If the T-CON is not available, the LCD panel must be
replaced since the T-CON circuit is part of the LCD panel assembly. In rare
cases a loose or defective LVDS cable could also be the cause.
6X Blink - Back-light System
Failure
NOTE: All models will make two
attempts to power up before a 6X is activated. The SONY logo (Back-light) may or
may not display on the screen. However, the splash tones will be heard two
times. After the second attempt the TV will turn off and the standby LED will
blink a 6X protection mode. (Note: The splash tone may not be heard if it is
turned off or the volume is set to minimum.)
If a 6X blink pattern is activated then a defect has occurred in one of
the following areas.
* Defective Panel LED(s)
* Defective Power Supply
When troubleshooting a 6X
back-light system failure it is key to notice if the back-lights illuminate
before the TV shuts off. The following list shows the possible back-light status
and blink pattern and the possible failed components.
1. Momentary Back-light and 6X: Defective LED(s) (LCD Panel Assy.)
2. No Backlight and 6X: Replace Power Supply
In most cases, if the Sony logo
(Back-light) momentarily illuminates and the TV shuts off and a 6X is activated
than one or more of the back-light LEDs are defective. The LCD Panel assembly
panel must be replaced for a defective LED. However, before replacing the LCD
panel assembly checks for a complete loss of the Negative Back-light (-89V to
-125V) power supply. The -89V to -125V power supply can be checked at
CN6702/pins 1 & 3.
If there is no back-light before
the TV shuts off and activates a 6X, than check the “Back-light ON” signals from
the TV microprocessor and the Positive (+145V) Back-light power supply from the
Power Supply Board. The BL-ON signal can be checked at CN6704/pin 5 and the
+145V at CN6701/pins 1 & 3. If the
“Back-light-ON” signal is okay and the Positive Power supply is missing then the
Power Supply Board is defective. However, if the Back-light-ON is missing then
the X-Reality Microprocessor is defective and the Main Board must be replaced
to repair the problem.
7X Blink - Temperature Failure
These models do not display a
temperature warning OSD dialogue box before shutting off and going into a 7X
standby LED blink pattern. The main objective when a 7X blink pattern occurs is
to determine which of the following possible defects is causing the excessive
temperature condition indication.
Excessive Ambient Room
Temperature
Dust or Debris Blocking the TV
Ventilation Apertures
Defective Temperature Sensor or
X-Reality Microprocessor (Main Board) The first step is to notice how long it
takes the TV to shut off and trigger a 7X blink protection mode. If the TV has an actual excessive temperature
condition it will take a considerable period of time to shut off and indicate a
7X blink protection mode. This is because it will take time for the TV components
to heat up and for the temperature sensor to detect the excessive temperature
and shut the TV off.
If the TV takes a considerable
period of time to shut-off check the following items:
* The TV should not be located too
close to any heating devices.
* The TV should have at least 4
inches of clearance around the sides & rear, and 11 inches of clearance
over the top to ensure adequate ventilation.
* Check that all vented areas on
the TV are clear of all dust and debris.
* If the TV shuts off immediately
after Power-ON then one of the following components has failed (Not an Actual
Excessive Temperature Condition).
# X-Reality Microprocessor (Main
Board)
# Temperature Sensor (Main Board)
In either case the Main Board
must be replaced to fix the problem.
The Diagnostic Table provides an
overview of the number of times the standby LED blinks and the possible
location.
VIEWING THE SELF CHECK DIAGNOSTIC
HISTORY
It is possible to bring up past
occurrences of a failure for confirmation on the Self Check diagnostic history
screen. This feature is useful for failures which are intermittent or when the
customer is not sure what is causing the television to shut down.
* TV must be in standby mode. (Power off).
* Press the following buttons on the Remote
Commander within a second of each other:
DISPLAY > CHANNEL-5 > VOLUME-[--] > POWER
* NOTE: This differs from
accessing Service Adjustments Mode (Volume +)
CLEARING THE SELF CHECK
DIAGNOSTIC LIST
Since the diagnostic results
displayed on the screen are not automatically cleared, always check the
self-diagnostic screen after you have completed the repairs to be sure you have
cleared the result display to “0”.
To clear the Error history and
Error count press { 8 > 0 }.
RESETTING THE LCD PANEL OPERATING
HOURS
The 3 sets of numbers displayed
on the lower left corner of the screen indicates the total accumulated
operating hours of the television and the operating hours of the LCD panel.
Total operating hours is on the left, boot count in the centre and panel hours
in the right group (The centre numbers are not used.)
To clear the LCD Panel operating
hours of the LCD Panel after replacing the panel, press {7 > 0}
EXITING THE SELF CHECK DIAGNOSTIC
SCREEN
To exit the Self Diagnostic
screen, turn off the power to the TV by pressing the POWER button on the remote
or the POWER button on the TV.
SELF CHECK SCREEN DISPLAY
CLICK ON THE PICTURES TO MAGNIFY
ELSYS - SET-TOP BOX - SCHEMATIC (Circuit Diagram)
Elsys - Set-top box - circuit diagram [Click on the schematics to Zoom In]
DISPLAY
MODULATOR
TUNER-VIDEO
AUDIO
POWER [SMPS]
Saturday, October 25, 2014
YAMAHA - YST SW030Y - YST SW101SS - SUB-WOOFER - DISASSEMBLY PROCEDURES _ Printed circuit boards _ Circuit diagram
YAMAHA YST-
SW030Y _ YST SW101SS – Sub-Woofer_DISASSEMBLY PROCEDURES _ Printed circuit boards _ Circuit
diagram {STK404-120Y}
Removal of Driver
* Remove 4 screws (1) and then remove the Base.
* Remove 4 screws (2) and then
remove the Driver.
* Disconnect the connector
connected to the terminal of the Driver.
Removal of Rear Panel Ass'y
* Remove 8 screws. * Screws (3) are identified with arrow
marks (ß
).
* Pull out the rear panel ass'y.
When Checking the P.C.B
# Connect all the connectors removed during disassembly back
to the original positions.
# Spread the Rubber sheet and cloth for insulation purpose and
place the rear panel ass'y on it.
PCBs
SCHEMATIC (Circuit Diagram)
Click on the pictures to Magnify
YAMAHA YST-SW315 - Sub-Woofer - SCHEMATIC DIAGRAM - ADJUSTMENTS
Yamaha YST-SW315 _ Sub-Woofer _ Circuit Diagram & Adjustments [A1145_C2705]
Idling Adjustment
* To stabilize operation of the
amplifier, turn ON the power with no input signal and wait for 2 to 3 minutes
in non loaded condition before the adjustment.
* Confirm that the voltage across
the terminals TP11 and TP12 is 10 mV to 200 mV.
If it exceeds 200 mV, open (cut off) R172.
Confirmation of AUTO STANDBY
operation.
Setting
# Turn off the power switch located
on the rear panel.
# In order to shorten the time required for
operation check; connect a 10kΩresistor at both ends of R252 on the MAIN P.C.B.
# Connect the output signal from
the signal generator to the INPUT 2 / L/MONO terminal of the unit.
# Set the signal generator for the
sine wave of 100Hz, 8mV.
# Turn on the power switch located
on the rear panel.
Confirmation
* Set the AUTO STANDBY switch to
the LOW position.
* Turn on the STANDBY/ON switch.
* The display LED lights up (green)
and its colour changes
* To red after 5 to 10 seconds.
* Turn off the STANDBY/ON switch.
* The display LED goes off.
* Set the AUTO STANDBY switch to
the HIGH position.
* Turn on the STANDBY/ON switch.
* The display LED lights up (green)
and its colour remains Unchanged even after time has
elapsed.
* Turn off the STANDBY/ON switch.
* The display LED goes off.
After confirmation
* Turn off the power switch.
** Disconnect the 10k Ωresistor connected to both
ends of R252.
SCHEMATIC [Circuit Diagram] & PWB
Click on the pictures to Magnify
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