AV-21L31
AV-25L31
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION
1. You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment 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 the 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, capacitors, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.
Y User mode setting position
Setting itemSetting value
PICTURE MODE(VSM)BRIGHT
VNROFF
BASS, TREBLE, BALANCECENTER
TINT,COLOR,BRIGHT,PICTURE,DETAILCENTER
MEASURING INSTRUMENT
1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [NTSC]
4. Remote control unit
ADJUSTMENT ITEMS
YB1 POWER SUPPLYYDEFLECTION CIRCUIT ADJUSTMENTS
YFOCUS ADJUSTMENTAdjustment of V. SLOPE
IF CIRCUIT ADJUSTMENTS
YAdjustment of V. POSITION
Adjustment of VCO (CW)Adjustment of V. HEIGHT
Adjustment of DELAY POINT (AGC TAKE-OVER)Adjustment of H. POSITION
YVC (VIDEO/CHROMA) CIRCUIT ADJUSTMENTSAdjustment of H. WIDTH
Adjustment of WHITE BALANCE (Low light)Adjustment of SIDE PIN
Adjustment of WHITE BALANCE (High light)Adjustment of CORNER
Adjustment of SUB BRIGHTVSM PRESET SETTING
Y
Adjustment of SUB CONTRASTPRESET SETTING
Y
Adjustment of SUB COLOR-?AUDIO ADJUSTMENT
Y
Adjustment of SUB COLOR-??
Adjustment of SUB TINT-?
Adjustment of SUB TINT-??
12No. 51969 |
ACEC
