Service Adjustments; Adjustment Items - JVC AV-21W83 Service Manual

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AV-21W83
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AV-21W93
AV-21W93B
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SERVICE ADJUSTMENTS

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ADJUSTMENT PREPARATION
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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.
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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.
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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.
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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.
522 tu2522 tu2522 tu2522 tu2522 tu2522 tu2522 tu25 7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.
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User mode setting position
Setting item
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PICTURE MODE(VSM)
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BASS, TREBLE, BALANCE
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TINT, COLOUR, BRIGHT, SHARP
CONTRAST
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MEASURING INSTRUMENT
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1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL/SECAM/NTSC]
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4. Remote control unit
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ADJUSTMENT ITEMS

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•
B1 POWER SUPPLY
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FOCUS ADJUSTMENT
•
IF CIRCUIT ADJUSTMENTS
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Adjustment of VCO (CW)
Adjustment of DELAY POINT (AGC TAKE-OVER)
•
VC (VIDEO/CHROMA) CIRCUIT ADJUSTMENTS
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Adjustment of WHITE BALANCE (Low light)
Adjustment of WHITE BALANCE (High light)
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Adjustment of SUB BRIGHT
Adjustment of SUB CONTRAST
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Adjustment of SUB COLOUR-Ι Ι Ι Ι Ι
Adjustment of SUB COLOUR-ΙΙ ΙΙ ΙΙ ΙΙ ΙΙ
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Adjustment of SUB TINT-ΙΙ ΙΙ ΙΙ ΙΙ ΙΙ
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14
Setting value
BRIGHT
OFF
CENTRE
CENTRE
MAXIMUM
•
DEFLECTION CIRCUIT ADJUSTMENTS
•
VSM PRESET SETTING
•
PRESET SETTING
•
AUDIO ADJUSTMENT [AV-21W93
•
PURITY ADJUSTMENT
•
CONVERGENCE ADJUSTMENTS
No. 52016
Adjustment of V. SLOPE
Adjustment of V. POSITION
Adjustment of V. HEIGHT
Adjustment of H. POSITION
Adjustment of H. WIDTH
Adjustment of SIDE PIN
Adjustment of TRAPEZIUM
Adjustment of V. S-CURVE
Adjustment of CORNER
Adjustment of H. PARALLEL
Adjustment of H. BOW
/BK
Adjustment of STATIC CONVERGENCE
Adjustment of DYNAMIC CONVERGENCE
, AV-21W93B only]
/BK