JVC AV-21Q3/D Schematic Diagrams page 24

AV-21Q3
AV-21QMG3
AV-2115EE
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
1. There are 2 way of adjusting this TV:
REMOTE CONTROL UNIT and the other is the conventional
method using adjustment parts and components.
2. The adjustment with the REMOTE CONTROL UNIT is made
on the basis of the initial setting values. The setting values
which adjust the screen to its optimum condition may differ
from the initial setting values.
3. Make sure that connection is correctly made to AC power
source.
4. Turn on the power of the set and 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.
MEASURING INSTRUMENT AND FIXTURES
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL / SECAM / NTSC]
4. Remote control unit
ADJUSTMENT ITEMS
Adjustment item
B1 POWER SUPPLY
FOCUS adjustment
IF circuit adjustment
V/C (Video / Chroma) circuit adjustment
14
One is with the 6. Never touch any adjustment parts, which are not specified
7. Preparation for adjustment
Adjustment item
DEFLECTION circuit adjustment
VSM PRESET setting
PURITY/ CONVERGENCE adjustment
No. 52027
in the list for this adjustment VRs, transforms, condensers,
etc.
Unless otherwise specified in the adjustment instructions, preset
the following functions with the REMOTE CONTROL UNIT.
User mode position
PICTURE MODE (VSM)
VNR
TINT / COLOUR / BRIGHT
CONT. / SHARP
BLUE BACK
OFF TIMER
AI ECO SENSOR
AUTO SHUT OFF
SETUP TOUR
BRIGHT
OFF
CENTER
OFF
OFF
OFF
OFF
ON