Alignment Instructions - Daewoo 14Q1 Service Manual

Alignment Instructions

1. AFT
1.1 Standard B/G,D/K,I
1) Set a Signal Generator with
- RF FREQUENCY = 38.9 MHz,
- RF OUTPUT LEVEL = 80 5 dBuV
- System = PAL / SECAM - B/G, D/K, I
NTSC - 3.58/4.43
2) Connect the Signal Generator RF Output to P101 (Tuner IF Output).
There must be no signal input to the tuner.
3) Press the "AFT" KEY and wait until the TV screen display "AFT OK".
2. AGC
1) Set a Pattern Generator with RF LEVEL 63
2) Connect a OSCILLOSCOPE PROBE to P102 (TUNER AGC INPUT).
3) Adjust AGC UP/DOWN KEY the voltage drop 3.5V dc point its maximum voltage.(TDA8374A N1 VERSION)
Adjust AGC UP/DOWN KEY the voltage drop 1.5V dc over blow its maximum voltage(TDA8374A N3 VERSION)
Alternative Method
1) Set a Pattern Generator with
- RF LEVEL 80 5 dBuV
- PAL CROSSHATCH
( without SOUND CARRIER )
2) Connect a OSCILLOSCOPE
( Bandwidth 100MHz ) PROBE
to P101 (TUNER IF OUTPUT).
3) Use AGC UP/DOWN KEY to obtain
an envelop amplitude 200 + 20 mVp-p.
3. SCREEN
1) Apply a COLOR BAR pattern signal.
2) Set the CONTRAST, BRIGHTNESS
to MAX, COLOR to MIN.
3) Set the R,G,B LEVEL to CENTER (31/63)
with R,G,B UP/DOWN KEY.
4) Connect a OSCILLOSCOPE PROBE
to P904 ( CRT CATHOD R, G, B ).
5) Adjust the SCREEN VOLUME on FBT
such that the highest black level voltage
160 5Vdc (20", 21"), 130 5Vdc (14").
4. WHITE BALANCE
1) Set the TV to NOR I mode.
2) Set the R,G,B LEVEL to CENTER with R,G,B UP/DOWN KEY .
3) Adjust the R,G,B UP/DOWN KEY of the other color which did not appear
on the screen to obtain WHITE.
5. FOCUS
1) Apply a RETMA PATTERN signal.
2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.
2 dBuV .
4
Black level
160 5Vdc ( 20", 21" )
130 5Vdc ( 14" )
GND