HOW TO ENTER SERVICE MODE - JVC AV-21BF11ENS - AV-21BF11EES - AV-21BF11EPS - AV-21BF11EJS

HOW TO ENTER SERVICE MODE - JVC AV-21BF11ENS - AV-21BF11EES - AV-21BF11EPS - AV-21BF11EJS

CRT TV

SERVICE MODE

 SERVICE ADJUSTMENTS

ADJUSTMENT PREPARATION
1. You can make the necessary adjustments for this unit with either the Remote Control Unit or with the adjustment tools and parts as given below.
2. Adjustment with the Remote Control Unit is made on the basis of the initial setting values, however, the new setting values which set the screen to its optimum condition may differ from the initial settings.
3. Make sure that AC power is turned on correctly.
4. Turn on the power for set and test equipment before use, and start the adjustment procedures after waiting at least 30 minutes.
5. Unless otherwise specified, prepare the most suitable reception or input signal for adjustment.

6. Never touch any adjustment parts which are not specified in the list for this adjustment - variable resistors, transformers, condensers, etc.
7. Presetting before adjustment. Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit:

ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter)
2. Signal generator (Pattern generator) ［PAL/SECAM/NTSC］
3. Remote control unit

ADJUSTMENT ITEM
# SCREEN ADJUST MENT
# OSD HORIZONTAL POSITION ADJUSTMENT
# IF ADJUSTMENT
# AGC AUTOMATICALLY ADJUSTMENT
# DEFLECTION CIRCUIT ADJUSTMENT
# GEOMET RY MENU ADJUSTMENT
 #WHITE BALANCE ADJUSTMENT

 BASIC OPERATION SERVICE MENU

HOW TO ENTER THE SERVICE MENU

1) Press the MENU key.
2) MENU screen will be displayed

3) While the MENU screen is displayed , press the 4,7,2,5 key or INFORMATION key and MUTING key simultaneously.
4) The SERVICE MENU screen will be displayed.

SELECTION OF ADJUSTMENT ITEMS
1) Enter the SERVICE MENU
2) Press the FUNCTION UP / DOWN  key and select the ADJUSTMENT ITEM.
3) Press the FUNCTION  LEFT/ RIGHT key and set the SETTING VALUE.

HOW TO EXIT SERVICE MODE
1) Press theST ANDARD Key on REMOTE CONTROL UNIT.

SETTING APS BIT IN SERVICE MENU
1) Enter service menu in TV mode by pressing ìINFORMATIONî and ìMUTINGî keys simultaneously. Service Menu will appear.
2) Select TX1(TELETEXT OPTION) by pressing Up/Down keys on remote control unit.
3) Press the 7 key on remote control unit to set APS bit. (After this, bit 7 of TX1 will be ì1î)
4) Press STANDARD key on remote control unit to exit service mode.
NOTE : DO NOT TURN OFF THE TV BY USING POWER BUTTON ON THE FRONT PANEL.

HOW TO ENTER THE GEOMETRY MENU
This model is built-in GEOMETRY MENU for geometry adjustment.
1) Enter the SERVICE MENU
2) Press the GREEN key, geometry menu appears.
3) Press the FUNCTION UP / DOWN  key and select the ADJUSTMENT ITEM.
4) Press the FUNCTION LEFT/ RIGHT key and set the SETTING VALUE.

SCREEN ADJUSTMENT

1. Enter SERVICE MENU.
2. Press YELLOW key to disable vertical scan.
3. Adjust SCREEN VR. on the FBT as thin as possible.
4. Press YELLOW key again to enable vertical scan.
5. Press MENU key to leave service menu.

OSD HORIZONTAL POSITION ADJUSTMENT

1. Enter SERVICE MENU.
2. Select OSD with FUNCTION ( UP / DOWN  ) key
3. Adjust the OSD horizontal position with the FUNCTION (LEFT/ RIGHT) key, which shifts the reference bar on the bottom of the SERVICE MENU horizontally, so that the OSD is positioned on the screen center. (X=Xí)

IF ADJUSTMENT

1. Enter SERVICE MENU.
2. Select IF 1 with FUNCTION (UP / DOWN  ) key
3. Press BLUE key during IF 1 is highlighted, IF 1 and IF 2 values are adjusted automatically by software.
4. If the standard is L-prime, IF 3 and IF 4 values are adjustment automatically when BLUE key is pressed during IF 1 is highlighted.

AGC AUTOMATICALLY ADJUSTMENT

1. Enter SERVICE MENU.
2. Receive a 60dBμ V RF signal level.
3. Select AGC with the FUNCTION (UP / DOWN  ) key.
4. Press BLUE key on the remote control unit.
5. Then the adjustment will be done automatically by software.
6. See the AGC indicator on SERVICE MENU, it must be ì1î.
7. Check that picture is normal at 90dBμ V signal level.

DEFLECTION CIRCUIT ADJUSTMENT

1. Receive a PAL B/G circle pattern.
2. Enter SERVICE MENU.
3. Select VLIN (Vertical linearity) with the FUNCTION (UP / DOWN   ) key.
4. Adjust VLIN with the FUNCTION (LEFT/ RIGHT) key until circle as round as possible.
5. Press the MENU key and memorize the set value.

RGB MODE HORIZONTAL SHIFT OFFSET ADJUSTMENT

1. Input R/G/B circle pattern signal via video input terminal.
2. Press AV key on the remote control unit, force the TV to RGB mode.
3. Enter SERVICE MENU.
4. Select RGBH (RGB mode horizontal shift offset) with the FUNCTION (UP / DOWN  ) key.
5. Adjust RGBH with the FUNCTION (LEFT/ RIGHT ) key until the circle pattern is horizontally centered.(A=B)
6. Check and readjust RGBH item if the adjustment becomes improper after some other geometric adjustments are done.

VERTICAL SIZ E OFFSET ADJUSTMENT (60Hz)

1. Receive a NTSC-M cross-hatch pattern of vertical frequency 60Hz.
2. Enter SERVICE MENU.
3. Select VSOF(Vertical size) with the FUNCTION (UP / DOWN   ) key.
4. Adjust VSOF with the FUNCTION (LEFT/ RIGHT ) key until the horizontal black lines on both the upper and lower part of the pattern become very close to the upper and lower horizontal sides of picture size and nearly about to disappear.
5. Check and readjust VSOF item if the adjustment becomes improper after some other geometric adjustments are done.

VERTICAL POSITION OFFSET adjustment (60Hz)

1. Receive a NTSC-M circle pattern of vertical frequency 60Hz.
2. Enter SERVICE MENU.
3. Select VPOF (Vertical position) with the FUNCTION (UP / DOWN   ) key.
4. Adjust VPOF with the FUNCTION (LEFT/ RIGHT ) key until the picture is vertically centered.(C=D)
5. Check and readjust vertical position item if the adjustment becomes improper after some other geometric adjustments are done.

HORIZONTAL POSITION OFFSET adjustment (60Hz)

1. Input a NTSC-M circle pattern signal of vertical frequency 60Hz.
2. Enter SERVICE MENU.
3. Select HPOF (Horizontal position) with the FUNCTION (UP / DOWN   ) key.
4. Adjust HPOF with the FUNCTION (LEFT/ RIGHT) key until the circle pattern is horizontally centered.(E=F)
5. Check and readjust a horizontal position item if the adjustment becomes improper after some other geometric adjustments are done.

GEOMETRY MENU ADJUSTMENT

VERTICAL SIZ E adjustment (50Hz)

1. Receive a PAL B/G cross-hatch pattern of vertical frequency 50Hz.
2. Enter SERVICE MENU.
3. Press GREEN key to enter the GEOMETRY MENU.
4. Select VSIZ (Vertical size) with the FUNCTION (UP / DOWN   ) key.
5. Adjust VSIZ with the FUNCTION (LEFT/ RIGHT) key until the screen the horizontal black lines on both the upper and lower pant of the pattern become very close to the upper and lower horizontal sides of picture size and nearly about to disappear.
6. Check and readjust VS2B item if the adjustment becomes improper after some other geometric adjustments are done.

VERTICAL POSITION adjustment (50Hz)

1. Receive a PAL B/G circle pattern signal of vertical frequency 50Hz.
2. Enter GEOMETRY MENU.
3. Select VPOS (Vertical position) with the FUNCTION (UP / DOWN   ) key.
4. Adjust VPOS with the FUNCTION (LEFT/ RIGHT ) key until the circle pattern is vertically centered.(A=B)
5. Check and readjust VPOS item if the adjustment becomes improper after some other geometric adjustments are done.

HORIZONTAL POSITION adjustment (50Hz)

1. Receive a PAL B/G circle pattern signal of vertical frequency  50Hz.
2. Enter GEOMETRY MENU.
3. Select HPOS (Horizontal position) with the FUNCTION (UP / DOWN   ) key.
4. Adjust HPOS with the FUNCTION (LEFT/ RIGHT) key until the circle pattern is horizontally centered.(C=D)
5. Check and readjust HPOS item if the adjustment becomes improper after some other geometric adjustments are done.

WHITE BALANCE ADJUSTMENT

WHITE BALANCE adjustment (Low light)

1. Receive a black & white signal (colour off).
2. Enter SERVICE MENU.
3. Select WR / WG / WB with the (UP / DOWN  ) key, respectively.
4. Adjust WR / W G / WB with the FUNCTION (LEFT/ RIGHT) key, respectively, until the white part turns to pure white without any other color.

WHITE BALANCE adjustment (High light)

1. Receive a black & white signal (colour off)
2. Enter SERVICE MENU.
3. Select BR / BG with the FUNCTION (UP / DOWN  ) key respectively.
4. Adjust BR / BG with the FUNCTION (LEFT/ RIGHT ) key respectively  until the white part of screen make white colour.