JVC AV20N81VT Repair Manual

AV-21D81
AV-20N81
AV-16N81
AV-16N81G
BASIC OPERATION OF SERVICE MENU
z The adjustment using SERVICE MENU
The following adjustment items use the SERVICE MENU in the series of the adjustment. The adjustments are made on the basis of the
initial setting values. The adjustment values which adjust the screen to the optimum condition can be different from the initial setting values.
With the SERVICE MENU, various settings can be made, and they are broadly classified in the following items of settings.
1.IF eeeeeeeeeeeeeeeeeeeeeeeAdjustment of the IF circuits.
2.V/CeeeeeeeeeeeeeeeeeeeeeeAdjustment of the VIDEO/CHROMA circuit.
3.VSM PRESET eeeeeeeeeeeeAdjustment of the initial setting values of VSM condition as STANDARD, SOFT and BRIGHT.
(VSM : Video Status Memory)
z Key operation of the SERVICE MENU
[Enter to SERVICE MENU]SERVICE MENU
Press the DISPLAY key and the PICTURE MODE key of the REMOTE CONTROL
UNIT simultaneously. Then enter the SERVICE MENU mode as shown in Fig.1.SERVICE MENU
[Exit from SERVICE MENU]1.IF 2.V/C
3.VSM PRESET
When complete the adjustment work, press the DISPLAY key to return to the
SERVICE MENU.
And then press the DISPLAY key again, return to the normal screen.1-3 SELECT DISP : EXIT
****************************************************.************
*** ** ***** ** ***** ** ***** ** **** ***** ***** ***** ***
[Select from SERVICE MENU]
In SERVICE MENU, press the number (1á3) key of the remote control unit, to selectFig.1
any of the adjustment items.
[Method of setting]
1. IF
[1. VCO]
ź 1 KeyeeeeeeeeeeeeeeeeeeSelect 1.IF.
  1 KeyeeeeeeeeeeeeeeeeeeSelect 1.VCO
! The VCO (CW) screen will be displayed a allow mark when
the AFC voltage is at a certain level.
c DISPLAY Key eeeeeeeeeeWhen this is pressed twice, you
will return to the SERVICE MENU.KEY ASSIGNMENT OF REMOTE CONTROL UNIT
[2. DELAY POINT]
ź 1 KeyeeeeeeeeeeeeeeeeeeSelect 1.IF.
  2 KeyeeeeeeeeeeeeeeeeeeSelect 2.DELAY POINT.
! MENU -/+eeeeeeeeeeeeeeSet (adjust) the setting values
of the setting items.
c DISPLAY Key eeeeeeeeeeWhen this is pressed twice, you
will return to the SERVICE MENU.
2.V/C and 3.VSM PRESET
ź 2,3KeyeeeeeeeeeeeeeeeeeSelect one from 2. V/C and
3. VSM PRESET.
  MENU U/� Key eeeeeeeSelect setting items.
! MENU -/+ eeeeeeeeeeeeeeAdjust the setting values of the
setting items.
c DISPLAY KeyeeeeeeeeeeeWhen this is pressed, return to
the SERVICE MENU.

18No. 51902