SELF DIAGNOSTIC FUNCTION
(LED blinking error codes)
The units in this manual
contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp
will automatically begin to flash.
The number of times the lamp flashes translates to a probable source of the
problem. A definition of the STANDBY/ TIMER lamp flash indicators is listed in
the instruction manual for the user’s knowledge and reference. If an error symptom
cannot be reproduced, the remote commander can be used to review the failure
occurrence data stored in memory to reveal past problems and how often these
problems occur.
DIAGNOSTIC TEST INDICATORS
When an errors occurs, the STANDBY/TIMER lamp will flash a set number of
times to indicate the possible cause of the problem. If there is more than one
error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No
error has occurred if the screen displays a “0”.
Note 1: If a + B over
current is detected, stoppage of the vertical deflection is detected
simultaneously. The symptom that is
diagnosed first by the microcontroller is displayed on the screen.
Note 2: Refer to screen (G2) Adjustment in section.
STOPPING THE STANDBY/TIMER
FLASH
Turn
off the power switch on the TV main unit or unplug the power cord from the
outlet to stop the STANDBY/TIMER lamp from flashing.
SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen
sometimes goes out” that cannot be confirmed, it is possible to bring up past
occurances of failure for confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in
rapid succession as shown below:
[Screen display] / channel [5] / Sound volume [-] / Power ON
˘
Note that this differs from entering the service mode (mode volume [+])
Self-Diagnosis screen
display
HANDLING OF
SELF-DIAGNOSTIC SCREEN DISPLAY
Since
the diagnostic results displayed on the screen are not automatically cleared,
always check the self-diagnostic screen during repairs. When you have completed
the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will
not be able to detect subsequent faults after completion of the repairs.
[Clearing the result display]
To clear the result display to “0”, press buttons on the remote commander
sequentially as shown below when the diagnostic screen is being displayed. Channel [8] / 0
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the
remote commander or the main unit.
SELF-DIAGNOSTIC CIRCUIT
[+B over current OCP]
Occurs when an over current on the +B(135) line is detected by Q604. If Q604 go
to ON and the voltage to pin 18 of IC301 should go down when V.SYNC is more
than seven verticals in a period, the unit will automatically turn off.
Vertical deflection
stopped] Occurs when an absence of the vertical deflection pulse is detected by
Q509 and IC001 shut down the power supply.
Vertical deflection over current] Occurs when an over current on V drive line
is detected by Q507. Power supply will be shut down when detect this by IC001.
White balance failure] If the RGB levels* do not balance or become low level
within 5 seconds, this error will be detected by IC301. TV will stay on, but
there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
"RESET" FUNCTION
1. Purpose
If
a customer faces some setting problem that cannot be solved, using the
"RESET" function some items will be reset to its original setting
(shipment condition)
2. How to Operate
The way to access to the "RESET" Function:-
a) By pressing "MENU" button or "SELECT" button (for
non-menu models) on the Front Key Input and hold it down for 5 seconds.
3. Subsequent of Operation
Sequential to the resetting operation (either methods being used in No. 2),
TV set would shut down once and automatically turn on again. The power-off
duration is expected to be about 500msec. An OSD message, "RESET"
tentatively will be displayed for 10 sec after IK status gets stable.
As a result, some items will be reset to an initial condition (shipment
condition) whereas some other remains at the last selection by user.
Items that remains at the last selection by user
Reset Items
Program No., Favorite CH Setup, PIC rotation, OSD Language, Fine tuning, TV
System, Skip.
FOCUS ADJUSTMENT
1)
Receive digital monoscope pattern.
2) Set "AV CONTROL" to "DYNAMIC"
3) a) Adjust FOCUS VR so that centre of the screen becomes just focus.
4) Change the receiving signal to white pattern and blue back.
5) Confirm MAGENTA RING is not noticeable, Incase magenta is very obvious,
adjust a FOCUS VR to take balance between MAGENTA RING and FOCUS.
FLYBACK TRANSFORMER (T503)
Screen
Focus
WHITE BALANCE ADJUSTMENT
1) Set to Service Mode. ADJUSTMENTS WITH COMMANDER
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select GCT (WHB 4) and BCT (WHB 5) with [1] and [4], and adjust the level
with [3] and [6] for the best white balance.
5) Set the PICTURE to maximum.
6) Select GDR (WHB 1) and BDR (WHB 2) with [1] and [4], and adjust the level
with [3] and [6] for the best white balance.
7) Write into the memory by pressing [MUTING] then [0].
SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black to white from the pattern generator.
3) BRIGHTNESS .... 50%.
PICTURE ............MINIMUM
4) Select SBR (WHB7) with [1]and [4], and adjust SBR (WHB7) level with [3] and
[6] so that the second stripe from the right is dimly lit.
G2 (SCREEN) AND WHITE BALANCE ADJUSTMENTS
G2 (SCREEN) ADJUSTMENT
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C6 board cathode to the oscilloscope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the value below.
5) Adjust G2 (screen) on the FBT until picture shows the point before cut off.
Service mode
ADJUSTMENTS WITH COMMANDER
Service
adjustments to this model can be performed using the supplied Remote Commander
RM-952.
a. ENTERING SERVICE MODE
With the unit on standby press Display > 5 > Volume (+) >
Power. This operation sequence puts the
unit into service mode.
Service mode screen
display
METHOD OF CANCELLATION
FROM SERVICE MODE
Set
the standby condition (Press [POWER] button on the commander), then press
[POWER] button again, hereupon it becomes TV mode.
METHOD OF WRITE INTO MEMORY
1) Set to Service Mode.
2) Press [1] (UP) and [4] (DOWN), to select the adjustment.
4) Press [MUTING] button to indicate WRITE on the screen.
5) Press [0] button to write into memory.
MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then plug into
AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
ADJUSTMENT METHOD
Item
Number 00 of device GEO
This explanation uses H-Position as an example.
1. Select “GEO 00 HPS” with the 1 and 4 buttons.
2. Raise/lower the data with the 3 and 6 buttons.
3. Select the optimum state. (The standard is 1F for PAL reception.)
4. Write with the [MUTING] button. (The display changes to WRITE.)
5. Execute the writing with the - button. (The WRITE display will be changed to
red color while executing, and back to SERVICE.)
Use the same method for
all Items. Use 1 and 4 to select the adjustment item, use 3 and 6 to adjust,
write with [MUTING], then execute the write with -.
Note : 1. In [WRITE], the data for all items are written into memory
together.
2. For adjustment items that have different standard data between 50Hz or 60Hz,
be sure to use the respective input signal after adjustment.
PICTURE QUALITY
ADJUSTMENTS - SUB COLOR ADJUSTMENT
1.
Input a PAL color-bar.
2. Set to the following condition:
PICTURE 100%, BRIGHTNESS 50%, COLOR 50%
3. Connect an oscilloscope to pin1(B OUT) of CN305, A board.
4. Set to Service Mode and select SAJ 3 ‘SCL’ with 1 and 4 of the commander
then adjust to VB2=VB3=VB4 with 3 and 6.
5. Press [MUTING] → - of the commander to write the data.
6. Adjust SAJ 3 ‘SCL’ as step 2 to 5 when receiving NTSC color-bar.
SUB HUE ADJUSTMENT
1.
Select Video.
2. Input a NTSC, color-bar, into Video.
3. Set the following condition:
PICTURE 100%, BRIGHTNESS 50%, COLOR 50%
4. Connect an oscilloscope to pin 1 (B OUT) of CN305, A board.
5. Select SAJ 1 ‘SHU’ with 1 and 4 of the commander by setting to Service Mode
and adjust to VB1=VB2=VB3=VB4 with 3 and 6.
The highest level of VB1,VB2,VB3,VB4 must be aligned at the same line.
Ideal difference level between VB2 and VB3 should be within ± 110mV.
6. Press [MUTING] → - of
the commander to write the data.
DEFLECTION ADJUSTMENT
1.
Set to Service Mode.
2. Input PAL color bar.
3. Using the 1 and 4 button, select category GEO (Service Mode).
4. Raise/lower the data using the 3 and 6 buttons.
Select and adjust the following items to obtain optimum image
5. Input 525/60Hz signal.
6. Using the 1 and 4 button select category GEO (Service Mode).
7. Select and adjust the following items to obtain optimum image. Raise/lower
the data with the 3 and 6 buttons.
H-TRAPEZOID ADJUSTMENT
1.
Receive cross hatch/dot signal.
2. Adjust RV1801 on C6 board to make H-trapezoid distortion best.
A BOARD ADJUSTMENT AFTER
IC003
(MEMORY) REPLACEMENT
1.
Enter to Service Mode.
2. Press commander buttons 5 and - (Data Initialize), and 2 and - (Data Copy)
to initialize the data.
3. Call each item number and check if the respective screen shows the normal
picture.
In cases where items are not well adjusted, rectify the items with fine
adjustment.
Write the data per each item number ([MUTING] +-).
4. Select item numbers “OPB0” (OP1), “OPB1” (OP2), “OPB2” (OP3), “OPB3” (OP4)
and respectively set the bit per model with command buttons 3 and 6.
5. Press commander buttons 8 and - (Test Normal) to return to the data that was
set on the shipment from the factory.
(This will also cancel Service Mode.)
PICTURE DISTORTION
ADJUSTMENT
Schematic diagram
Voltage list
No comments:
Post a Comment