CRT Television User Manual

1. AFT
1) Set a signal Generator with
- RF FREQUENCY = 38.9MHz, 34.2MHz (L’)
- RF OUTPUT LEVEL = 80+/-5dBuV
- System = PAL for 38.9MHz.
SECAM-I for 43.2MHz.
2) Connect the Signal Generator RF Output
(PAL 38.9MHz) to P101 (Tuner IF Output).
There must be no signal input to the tuner.
3) Locate the cusor to “VCO” in Service Mode Menu,
then press the “Vol +” key and wait until the
“Please wait” disappear on the TV screen.
4) Connect the Signal Generator RF Output
(SECAM-L 34.2MHz) to P101 (Tuner IF Output).
5) Locate the cusor to “VCO-L” in Service Mode Menu,
then press the “Vol +” key and wait until the
“Please wait” disappear on the TV screen.
R BIAS
G BIAS
B BIAS
R DRIVE
G DRIVE
B DRIVE
V. CENTER
V. SIZE
H. CENTER
VCO
VCO FIN
VCO-L
VCO-L FIN
AGC
LED EAST
Pr
SVC v0
159
136
127
35
31
32
10
23
28
07
107
05
113
NO
44
01
ENTER SERVICE MODE
1. Select the Pr 91.
2. Adjust “ Sparpness “ to 0.
3. Enter the service mode
using the follow keys.
R G MENU.
Alignment Instructions
2. SCREEN
1) Receive the Retma pattern and heat run over 15minutes.
2) Adjust the “R, G BIAS, R, G DRIVE” to 0, “B BIAS” to
127, “B DRIVE” to 32.
Adjust the screen volume that the Retma pattern reachs
the cut-off point.
3. WHITE BALANCE
1) Receive the Full white pattern and heat run over
15minutes.
2) Adjust the picture control at the point “X” value of white
balance instrument in 20cd/m
3) Enter the service mode.
4) Adjust “R BIAS, G BIAS” to x=288, y=301.
5) In order to exit the service mode power off the TV set and
power on.
6) Set the TV set to “Normal I” mode(20/21 inch) or set to
“Normal II” mode(14 inch)
7) Enter the service mode.
8) Adjust “R DRIVE, G DRIVE” to x=288, y=301.
9) Repeat above process until the white balance value to
x=288, y=301, X=20, x=288, y=301, X=200
(approximate) in 2) -8).
4. FOCUS
1) Apply a RETMA PATTERN signal.
2) Adjust the Focus Volume on FBT to obtain optimal
resolution.
5. AGC
1) Set a pattern Generator with
- RF LEVEL = 60dBuV
- 100% FULL COLOR BAR
2) Connect the Pattern Genetator RF Output to tuner
RF input.
3) Connect the probe of oscilloscope in AGC pin of tuner.
4) Adjust the AGC point to MAX - 1V.
( Simple Method )
1) Receive the pattern.
2) Locate the cusor in “AGC” and adjust using the
“VOL +” or “VOL -” keys.
3) Adjust the point there is no noise in about 60dBuV and no
beat in about 90dBuV.