Service Adjustments - JVC AV-21L41/BK Service Manual

REPLACEMENT OF MEMORY ICs
1. MEMORY ICs
This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circuits.
When replacing memory ICs, be sure to use ICs written with the initial values of data.
2. PROCEDURE FOR REPLACING MEMORY ICs
(1) Power off
Switch the power off and disconnect the power plug from the wall outlet.
(2) Replace ICs
Be sure to use memory ICs written with the initial data values.
(3) Power on
Connect the power plug into the wall outlet and switch the power on.
(4) Check and set SYSTEM CONSTANT SET
・ ・ ・ ・ It must not adjust without adjustment signals.
1) Press the DISPLAY key and the PICTURE MODE key of the REMOTE
CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) While the SERVICE MENU is displayed, again press the DISPLAY key and
PICTURE MODE key simultaneously, and the SYSTEM CONSTANT SET
screen of Fig. 2 will be displayed.
4) Check the setting values of the SYSTEM CONSTANT SET of Table 1 If the
value is different, select the setting item with the MENU ▼ / ▲ key, and set
the correct value with the MENU - / + key.
5) Press the DISPLAY key twice, and return to the normal screen.
(5) Receive channel of setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels
(channels preset) as described
(6) User Setting
Check the user setting value of Table 2, and if setting value is different, set
the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
(7) Setting of SERVICE MENU
Verify the setting items of the SERVICE MENU of Table 3, and reset where
necessary.
For setting, refer to the SERVICE ADJUSTMENTS.
NOTE
Both MENU -/+ Key and MENU
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
DISPLAY key
MENU
－ / ＋ key
/ key have the same functions.
PICTURE
MODE key
NUMBERS
key
MENU
▼/▲ key
No. 51859
AV-21L41
SERVICE MENU
1.IF 2.V/C
3.DEF 4.VSM PRESET
5.PRESET
6.TURBO TIMER OFF
1-6 SELECT DISP : EXIT
.
****** ****** ****** *********** ***** ***** ***** ** ** ** ** *** *** *** ***
*** ** ** *** ** ** *** ** **** *** *** ** ** ** *** ** *** ** ***
Fig.1
SYSTEM CONSTANT-Ⅰ Ⅰ Ⅰ Ⅰ
SYSTEM CONSTANT SET 1
COLOUR COLOUR : : : : ***** *****
COLOUR COLOUR ***** *****
BILINGUAL BILINGUAL : *** : ***
BILINGUAL BILINGUAL : *** : ***
TUNER TUNER : : : : ** **
TUNER TUNER ** **
ECO SENSOR ECO SENSOR : : YES YES
ECO SENSOR ECO SENSOR : : YES YES
LANGUAGE LANGUAGE : : E/R/A/F E/R/A/F
LANGUAGE LANGUAGE : : E/R/A/F E/R/A/F
: SELECT
: OPERATE DISP : EXIT
SYSTEM CONSTANT-Ⅱ Ⅱ Ⅱ Ⅱ
SYSTEM CONSTANT SET 2
B/B SOUND : NO
LOCK : 20
COLOUR AUTO : YES
QSS : MQSS
ALC : NO
TEXT RATE : 20
:SEL DISP:EXIT
:OPE
Fig.2
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