JVC AV-14F1P(PH), Service Manual

Page: 10 / 27

AV-14F1P
No. 56084 10
SERVICE ADJUSTMENTS
BEFORE STARTING 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
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.
7. Preparation for adjustment (presetting):
Unless otherwise specified in the adjustment items, preset the
following functions with the remote control unit.
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-
cuits.
●
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
2
C BUS ON/OFF CONTROL. (Fixed to ON.)
ADJUSTMENT/CHECK ITEMS
Adjustment/Check item Page
B1 POWER SUPPLY Check 16
IF VCO Adjustment 16
RF AGC Adjustment 16
FOCUS Adjustment 16
DEFLECTION CIRCUIT Adjustment 17
VIDEO/CHROMA CIRCUIT Adjustment 18
VIDEO STATUS Adjustment 21
X-RAY PROTECTION Check 22
PURITY, CONVERGENCE Adjustment 23
Function
VIDEO STATUS
TINT, COLOR, PICTURE, BRIGHT
DETAIL
Setting value
STANDARD
CENTER