Alignment Instructions - Hitachi C1421R Service Manual

• Alignment lnstructions
1.AFT
1.1 Standard 8/G,D/K,I and L
1) Set a Signal Generator with
- RF FREQUENCY = 38.9 MHz,
- RF OUTPUT LEVE L= 80 ±5 dBuV
- System = PAL/ SECAM- B/G, D/K, I
2) Connect the Signal Generator RF Output to P1 01 (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".
1.2 Standard SECAM-L' (France VHF-Low)
*
Above mentioned "1.1" adjustment has to be done in advance.
1) Set a Signal Generator with
- RF FREQUENCY = 34.2 MHz,
- RF OUTPUT LEVEL = 80±5 dBuV
- System = SECAM - L'
2) Connect the Signal Generator RF Output to P1 01 (Tuner IF Output).
There must be no signal input to the tuner.
3) Press the "L' AFT' KEY and wait until the TV screen display "L AFT OK".
2.AGC
1) Set a Pattern Generator with RF LEVE L 63 ±2 dBuV .
2) Connect a OSCILLOSCOPE PROBE to P101 (TUNER AGC INPUT).
3) Adjust AGC UP/DOWN KEY the voltage drop 1V de over below its maximum voltage.
*
Alternative Method
1) Set a Pattern Generator with
- RF LEVEL 80±5 dBuV
- PAL CROSSHATCH
( without SOUND CARRIER)
2) Connect a OSCILLOSCOPE
( Bandwidth
::2::
1 OOMHz ) PROBE
to P101 (TUNER IF OUTPUT).
3) Use AGC UP/DOWN KEY to obtain
an envelop amplitude 200 + 50 mVp-p.
3. SCREEN
1) Apply a COLOU R BAR pattern signal.
2) Set the CONTRAST, BRIGHTNESS
to MAX, COLOUR 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 P906 ( CRT CATHODE R, G, B ).
5) Adjust the SCREEN VOLUME on FBT
such that the highest black levei voltage
160 ±5Vdc (20", 21"), 130±5Vdc (14").
16- UK
IY~MIM!i
t
200mV+50mV
_1__
- - - Black levei
160 ± 5V dc(20" ,21 ")
130 ±5Vdc(14")
(GND)