Thursday, February 12, 2015

JVC LT-Z46ZF7 - LT-Z46ZF7/A - LT-Z46ZF7/B - LT-Z46ZF7/S SERVICE MODE AND POWER SUPPLY CIRCUIT

JVC LT-Z46ZF7 - LT-Z46ZF7/A - LT-Z46ZF7/B - LT-Z46ZF7/S


SERVICE MODE AND POWER SUPPLY CIRCUIT

SERVICE MODE
 (1) Press the [DISPLAY] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter the self check mode.
(3) Turn off the power by pressing the [POWER] key on the remote control unit.
HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
MEMORY IC REPLACEMENT PROCEDURE
1. Power off Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC Be sure to use the memory IC written with the initial setting values.
3. Power on Connect the power plug to the AC outlet and switch on the power.
4. Receiving channel setting Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User setting Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING INSTRUCTIONS and set the items as described.
6. SERVICE MODE setting Verify what to set in the SERVICE MODE, and set whatever is necessary
 ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC power source.
(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service adjustment.
PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT
MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator) [PAL]
• Remote control unit
ADJUSTMENT ITEMS
VIDEO CIRCUIT

• WHITE BALANCE (HIGH LIGHT) adjustment
BASIC OPERATION OF SERVICE MODE
HOW TO ENTER THE SERVICE MODE

(1) Press [DISPLAY] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN.
(2) In the SERVICE MENU, press the [1] key to display ADJUSTMENT MODE SCREEN.
Before enter the SERVICE MODE, press the [MODE] key to confirm that "TV" position is indicated. If it is in a wrong position, the SERVICE MODE operation cannot be performed.
• When a number key other than the [1] key is pressed in the SERVICE MODE SCREEN, the other relevant screen may be displayed. This is not used in the adjustment procedure. Press the [MENU] key to return to the SERVICE MODE SCREEN.
HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT
HOW TO ENTER THE ADJUSTMENT MODE
When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE
VIDEO CIRCUIT ADJUSTMENT PROCEDURE
Item
Measuring
Adjustment part
Description
WHITE
BALANCE
(HIGHLIGHT)
instrument
Remote
control unit
Signal
generator
[1.ADJUST]
S001: R DRIVE (Red drive)
S002: G DRIVE (Green drive)
S003: B DRIVE (Blue drive)
(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set WHITE BALANCE to "MID".
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Adjust to Keep one of <S001> (Red drive),
<S002> (Green drive) or <S003> (Blue drive)
unchanged, then lower the other two so that the
all-white screen is equally white throughout.
NOTE:
Set one or more of <S001>, <S002>, and
<S003> to "137".
(7) Check that white balance is properly tracked
from low light to high light. If the white balance
tracking is deviated, adjust to correct it.
(8) Press the [MUTING] key to memoirze the set
value.

HOW TO ENTER THE SELF CHECK MODE
Before enter the SELF CHECK MODE, press the [MODE] key to confirm that "TV" position is indicated. If it is in a wrong position, the SELF CHECK MODE operation cannot be performed.
(1) Press the [DISPLAY] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) Press the [2] key SELF CHECK MODE.
(3) Press the [ZOOM] key to enter Page 2 of the SELF CHECK MODE.
*Use the [CINEMA] key to toggle between Page 1 and Page 2.
NOTE: When a number key other than the [2] key is pressed in the SERVICE MODE screen, the other relevant screen may be displayed. This is not used in the SELF CHECK MODE. Press the [MENU] key to return to the MAIN MENU SCREEN.
HOW TO EXIT THE SELF CHECK MODE
To Save Failure History: Turn off the power by unplugging the AC power cord plug when in the Self check display mode.
To Clear (Reset) Failure History: Turn off the power by pressing the [POWER] key on the remote control unit when in the Self check display mode.
FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When the number exceeds 9, display will remain as 9. Failure history will be stored in the memory unless it has been deleted.
NOTE: Only SYNC (with/without sync signals) will be neither counted nor stored.
POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE
In addition to circuit failures (abnormal operation), the following cases may also be iagnosed as "Abnormal" and displayed and counted as "NG".
(1) Temporary defective transmissions across circuits due to pulse interruptions
(2) Misalignment in the on/off timing of power for I2C bus (VCC) when turning on/off the main power. Diagnosis may be impeded if a large number of items are displayed as "NG". As such, start Self check check only after 3 seconds in the case of receivers and 5 seconds in the case of panels upon turning on the power. If recurrences are expected, ensure to clear (reset) the failure history and record the new diagnosis reults.
POWER SUPPLY CIRCUIT 
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