Service Adjustments - JVC AV-21F1P Service Manual

AV-21F1P

SERVICE ADJUSTMENTS

BEFORE STARTING SERVICE ADJUSTMENT
1. There are 2 ways for adjusting this TV: One is with the
REMOTE CONTROL UNIT and the other is the conventional
method using adjustment parts and components.
2. The setting (adjustment) using the REMOTE CONTROL
UNIT is made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum con-
dition can be different from the initial setting values.
3. Make sure that connection is correctly made to AC power source.
4. Turn on the power of the TV and measuring instrument for warm-
ing up for at least 30 minutes before starting adjustment.
5. If the receive or input signal is not specified, use the most ap-
propriate signal for adjustment.
6. Never touch parts (such as variable resistors, transformers and
capacitors) not shown in the adjustment items of this service
adjustment.
MEASURING INSTRUMENT
AND FIXTURES
1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator)
[PAL / SECAM / NTSC]
4. Remote control unit
5. TV audio multiplex signal generator
6. Frequency counter
BASIC OPERATION IN SERVICE MENU
1. TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the remote control unit.
2. SERVICE MENU ITEMS
With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings:
PICTURE ..................... For entering/adjusting the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION cir-
VIDEO STATUS .......... For setting the values for CINEMA and GAME.
OTHERS ...................... For setting the values of other items.
LOW LIGHT ................. For setting the values of WHITE BALANCE circuit.
HIGH LIGHT ................ For setting the values of WHITE BALANCE circuit .
RF AFC CHK ............... For checking the RF AFC circuit. (Do not adjust.)
VCO (CW) ................... For adjusting the IF circuit.
I 2 C BUS CTRL ............. I
10
cuits.
2 C BUS ON/OFF CONTROL. (Fixed to ON.)
7. Preparation for adjustment (presetting):
Unless otherwise specified in the adjustment items, preset the
following functions with the remote control unit.
Function
VIDEO STATUS
TINT, COLOR, PICTURE, BRIGHT
DETAIL
ADJUSTMENT/CHECK ITEMS
Adjustment/Check item
B1 POWER SUPPLY Check
IF VCO Adjustment
RF AGC Adjustment
FOCUS Adjustment
DEFLECTION CIRCUIT Adjustment
VIDEO/CHROMA CIRCUIT Adjustment
VIDEO STATUS Adjustment
X-RAY PROTECTION Check
PURITY, CONVERGENCE Adjustment
No. 56033
Setting value
STANDARD
CENTER
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